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919f4ebc59
Reported by syzkaller:
KASAN: null-ptr-deref in range [0x0000000000000140-0x0000000000000147]
CPU: 1 PID: 8370 Comm: syz-executor859 Not tainted 5.11.0-syzkaller #0
RIP: 0010:synic_get arch/x86/kvm/hyperv.c:165 [inline]
RIP: 0010:kvm_hv_set_sint_gsi arch/x86/kvm/hyperv.c:475 [inline]
RIP: 0010:kvm_hv_irq_routing_update+0x230/0x460 arch/x86/kvm/hyperv.c:498
Call Trace:
kvm_set_irq_routing+0x69b/0x940 arch/x86/kvm/../../../virt/kvm/irqchip.c:223
kvm_vm_ioctl+0x12d0/0x2800 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3959
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Hyper-V context is lazily allocated until Hyper-V specific MSRs are accessed
or SynIC is enabled. However, the syzkaller testcase sets irq routing table
directly w/o enabling SynIC. This results in null-ptr-deref when accessing
SynIC Hyper-V context. This patch fixes it.
syzkaller source: https://syzkaller.appspot.com/x/repro.c?x=163342ccd00000
Reported-by: syzbot+6987f3b2dbd9eda95f12@syzkaller.appspotmail.com
Fixes: 8f014550df
("KVM: x86: hyper-v: Make Hyper-V emulation enablement conditional")
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1614326399-5762-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2183 lines
56 KiB
C
2183 lines
56 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* KVM Microsoft Hyper-V emulation
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*
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* derived from arch/x86/kvm/x86.c
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*
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* Copyright (C) 2006 Qumranet, Inc.
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* Copyright (C) 2008 Qumranet, Inc.
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* Copyright IBM Corporation, 2008
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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* Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
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*
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* Authors:
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* Avi Kivity <avi@qumranet.com>
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* Yaniv Kamay <yaniv@qumranet.com>
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* Amit Shah <amit.shah@qumranet.com>
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* Ben-Ami Yassour <benami@il.ibm.com>
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* Andrey Smetanin <asmetanin@virtuozzo.com>
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*/
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#include "x86.h"
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#include "lapic.h"
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#include "ioapic.h"
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#include "cpuid.h"
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#include "hyperv.h"
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#include "xen.h"
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#include <linux/cpu.h>
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#include <linux/kvm_host.h>
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#include <linux/highmem.h>
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#include <linux/sched/cputime.h>
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#include <linux/eventfd.h>
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#include <asm/apicdef.h>
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#include <trace/events/kvm.h>
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#include "trace.h"
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#include "irq.h"
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/* "Hv#1" signature */
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#define HYPERV_CPUID_SIGNATURE_EAX 0x31237648
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#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64)
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static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
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bool vcpu_kick);
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static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
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{
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return atomic64_read(&synic->sint[sint]);
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}
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static inline int synic_get_sint_vector(u64 sint_value)
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{
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if (sint_value & HV_SYNIC_SINT_MASKED)
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return -1;
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return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
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}
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static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
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int vector)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
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if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
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return true;
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}
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return false;
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}
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static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
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int vector)
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{
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int i;
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u64 sint_value;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
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sint_value = synic_read_sint(synic, i);
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if (synic_get_sint_vector(sint_value) == vector &&
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sint_value & HV_SYNIC_SINT_AUTO_EOI)
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return true;
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}
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return false;
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}
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static void synic_update_vector(struct kvm_vcpu_hv_synic *synic,
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int vector)
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{
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if (vector < HV_SYNIC_FIRST_VALID_VECTOR)
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return;
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if (synic_has_vector_connected(synic, vector))
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__set_bit(vector, synic->vec_bitmap);
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else
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__clear_bit(vector, synic->vec_bitmap);
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if (synic_has_vector_auto_eoi(synic, vector))
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__set_bit(vector, synic->auto_eoi_bitmap);
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else
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__clear_bit(vector, synic->auto_eoi_bitmap);
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}
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static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint,
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u64 data, bool host)
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{
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int vector, old_vector;
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bool masked;
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vector = data & HV_SYNIC_SINT_VECTOR_MASK;
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masked = data & HV_SYNIC_SINT_MASKED;
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/*
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* Valid vectors are 16-255, however, nested Hyper-V attempts to write
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* default '0x10000' value on boot and this should not #GP. We need to
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* allow zero-initing the register from host as well.
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*/
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if (vector < HV_SYNIC_FIRST_VALID_VECTOR && !host && !masked)
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return 1;
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/*
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* Guest may configure multiple SINTs to use the same vector, so
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* we maintain a bitmap of vectors handled by synic, and a
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* bitmap of vectors with auto-eoi behavior. The bitmaps are
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* updated here, and atomically queried on fast paths.
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*/
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old_vector = synic_read_sint(synic, sint) & HV_SYNIC_SINT_VECTOR_MASK;
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atomic64_set(&synic->sint[sint], data);
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synic_update_vector(synic, old_vector);
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synic_update_vector(synic, vector);
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/* Load SynIC vectors into EOI exit bitmap */
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kvm_make_request(KVM_REQ_SCAN_IOAPIC, hv_synic_to_vcpu(synic));
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return 0;
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}
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static struct kvm_vcpu *get_vcpu_by_vpidx(struct kvm *kvm, u32 vpidx)
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{
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struct kvm_vcpu *vcpu = NULL;
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int i;
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if (vpidx >= KVM_MAX_VCPUS)
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return NULL;
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vcpu = kvm_get_vcpu(kvm, vpidx);
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if (vcpu && kvm_hv_get_vpindex(vcpu) == vpidx)
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return vcpu;
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kvm_for_each_vcpu(i, vcpu, kvm)
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if (kvm_hv_get_vpindex(vcpu) == vpidx)
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return vcpu;
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return NULL;
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}
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static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vpidx)
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vcpu_hv_synic *synic;
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vcpu = get_vcpu_by_vpidx(kvm, vpidx);
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if (!vcpu || !to_hv_vcpu(vcpu))
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return NULL;
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synic = to_hv_synic(vcpu);
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return (synic->active) ? synic : NULL;
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}
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static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
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{
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struct kvm *kvm = vcpu->kvm;
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struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
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struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
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struct kvm_vcpu_hv_stimer *stimer;
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int gsi, idx;
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trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
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/* Try to deliver pending Hyper-V SynIC timers messages */
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for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
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stimer = &hv_vcpu->stimer[idx];
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if (stimer->msg_pending && stimer->config.enable &&
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!stimer->config.direct_mode &&
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stimer->config.sintx == sint)
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stimer_mark_pending(stimer, false);
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}
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idx = srcu_read_lock(&kvm->irq_srcu);
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gsi = atomic_read(&synic->sint_to_gsi[sint]);
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if (gsi != -1)
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kvm_notify_acked_gsi(kvm, gsi);
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srcu_read_unlock(&kvm->irq_srcu, idx);
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}
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static void synic_exit(struct kvm_vcpu_hv_synic *synic, u32 msr)
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{
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struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
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struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
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hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNIC;
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hv_vcpu->exit.u.synic.msr = msr;
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hv_vcpu->exit.u.synic.control = synic->control;
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hv_vcpu->exit.u.synic.evt_page = synic->evt_page;
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hv_vcpu->exit.u.synic.msg_page = synic->msg_page;
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kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
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}
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static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
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u32 msr, u64 data, bool host)
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{
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struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
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int ret;
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if (!synic->active && !host)
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return 1;
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trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
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ret = 0;
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switch (msr) {
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case HV_X64_MSR_SCONTROL:
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synic->control = data;
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if (!host)
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synic_exit(synic, msr);
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break;
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case HV_X64_MSR_SVERSION:
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if (!host) {
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ret = 1;
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break;
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}
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synic->version = data;
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break;
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case HV_X64_MSR_SIEFP:
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if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
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!synic->dont_zero_synic_pages)
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if (kvm_clear_guest(vcpu->kvm,
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data & PAGE_MASK, PAGE_SIZE)) {
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ret = 1;
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break;
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}
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synic->evt_page = data;
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if (!host)
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synic_exit(synic, msr);
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break;
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case HV_X64_MSR_SIMP:
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if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
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!synic->dont_zero_synic_pages)
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if (kvm_clear_guest(vcpu->kvm,
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data & PAGE_MASK, PAGE_SIZE)) {
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ret = 1;
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break;
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}
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synic->msg_page = data;
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if (!host)
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synic_exit(synic, msr);
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break;
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case HV_X64_MSR_EOM: {
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int i;
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for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
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kvm_hv_notify_acked_sint(vcpu, i);
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break;
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}
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case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
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ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data, host);
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break;
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default:
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ret = 1;
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break;
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}
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return ret;
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}
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static bool kvm_hv_is_syndbg_enabled(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *entry;
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entry = kvm_find_cpuid_entry(vcpu,
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HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES,
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0);
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if (!entry)
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return false;
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return entry->eax & HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
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}
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static int kvm_hv_syndbg_complete_userspace(struct kvm_vcpu *vcpu)
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{
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struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
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if (vcpu->run->hyperv.u.syndbg.msr == HV_X64_MSR_SYNDBG_CONTROL)
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hv->hv_syndbg.control.status =
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vcpu->run->hyperv.u.syndbg.status;
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return 1;
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}
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static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr)
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{
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struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu);
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struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
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hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNDBG;
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hv_vcpu->exit.u.syndbg.msr = msr;
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hv_vcpu->exit.u.syndbg.control = syndbg->control.control;
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hv_vcpu->exit.u.syndbg.send_page = syndbg->control.send_page;
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hv_vcpu->exit.u.syndbg.recv_page = syndbg->control.recv_page;
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hv_vcpu->exit.u.syndbg.pending_page = syndbg->control.pending_page;
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vcpu->arch.complete_userspace_io =
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kvm_hv_syndbg_complete_userspace;
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kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
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}
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static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
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{
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struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu);
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if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
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return 1;
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trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id,
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to_hv_vcpu(vcpu)->vp_index, msr, data);
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switch (msr) {
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case HV_X64_MSR_SYNDBG_CONTROL:
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syndbg->control.control = data;
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if (!host)
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syndbg_exit(vcpu, msr);
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break;
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case HV_X64_MSR_SYNDBG_STATUS:
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syndbg->control.status = data;
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break;
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case HV_X64_MSR_SYNDBG_SEND_BUFFER:
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syndbg->control.send_page = data;
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break;
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case HV_X64_MSR_SYNDBG_RECV_BUFFER:
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syndbg->control.recv_page = data;
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break;
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case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
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syndbg->control.pending_page = data;
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if (!host)
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syndbg_exit(vcpu, msr);
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break;
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case HV_X64_MSR_SYNDBG_OPTIONS:
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syndbg->options = data;
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break;
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default:
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break;
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}
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return 0;
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}
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static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
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{
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struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu);
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if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
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return 1;
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switch (msr) {
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case HV_X64_MSR_SYNDBG_CONTROL:
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*pdata = syndbg->control.control;
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break;
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case HV_X64_MSR_SYNDBG_STATUS:
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*pdata = syndbg->control.status;
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break;
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case HV_X64_MSR_SYNDBG_SEND_BUFFER:
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*pdata = syndbg->control.send_page;
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break;
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case HV_X64_MSR_SYNDBG_RECV_BUFFER:
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*pdata = syndbg->control.recv_page;
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break;
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case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
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*pdata = syndbg->control.pending_page;
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break;
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case HV_X64_MSR_SYNDBG_OPTIONS:
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*pdata = syndbg->options;
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break;
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default:
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break;
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}
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trace_kvm_hv_syndbg_get_msr(vcpu->vcpu_id, kvm_hv_get_vpindex(vcpu), msr, *pdata);
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return 0;
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}
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static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata,
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bool host)
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{
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int ret;
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if (!synic->active && !host)
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return 1;
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ret = 0;
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switch (msr) {
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case HV_X64_MSR_SCONTROL:
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*pdata = synic->control;
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break;
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case HV_X64_MSR_SVERSION:
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*pdata = synic->version;
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break;
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case HV_X64_MSR_SIEFP:
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*pdata = synic->evt_page;
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break;
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case HV_X64_MSR_SIMP:
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*pdata = synic->msg_page;
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break;
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case HV_X64_MSR_EOM:
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*pdata = 0;
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break;
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case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
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*pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
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break;
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default:
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ret = 1;
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break;
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}
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return ret;
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}
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static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
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{
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struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
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struct kvm_lapic_irq irq;
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int ret, vector;
|
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|
|
if (sint >= ARRAY_SIZE(synic->sint))
|
|
return -EINVAL;
|
|
|
|
vector = synic_get_sint_vector(synic_read_sint(synic, sint));
|
|
if (vector < 0)
|
|
return -ENOENT;
|
|
|
|
memset(&irq, 0, sizeof(irq));
|
|
irq.shorthand = APIC_DEST_SELF;
|
|
irq.dest_mode = APIC_DEST_PHYSICAL;
|
|
irq.delivery_mode = APIC_DM_FIXED;
|
|
irq.vector = vector;
|
|
irq.level = 1;
|
|
|
|
ret = kvm_irq_delivery_to_apic(vcpu->kvm, vcpu->arch.apic, &irq, NULL);
|
|
trace_kvm_hv_synic_set_irq(vcpu->vcpu_id, sint, irq.vector, ret);
|
|
return ret;
|
|
}
|
|
|
|
int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vpidx, u32 sint)
|
|
{
|
|
struct kvm_vcpu_hv_synic *synic;
|
|
|
|
synic = synic_get(kvm, vpidx);
|
|
if (!synic)
|
|
return -EINVAL;
|
|
|
|
return synic_set_irq(synic, sint);
|
|
}
|
|
|
|
void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
|
|
{
|
|
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
|
|
int i;
|
|
|
|
trace_kvm_hv_synic_send_eoi(vcpu->vcpu_id, vector);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
|
|
if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
|
|
kvm_hv_notify_acked_sint(vcpu, i);
|
|
}
|
|
|
|
static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vpidx, u32 sint, int gsi)
|
|
{
|
|
struct kvm_vcpu_hv_synic *synic;
|
|
|
|
synic = synic_get(kvm, vpidx);
|
|
if (!synic)
|
|
return -EINVAL;
|
|
|
|
if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
|
|
return -EINVAL;
|
|
|
|
atomic_set(&synic->sint_to_gsi[sint], gsi);
|
|
return 0;
|
|
}
|
|
|
|
void kvm_hv_irq_routing_update(struct kvm *kvm)
|
|
{
|
|
struct kvm_irq_routing_table *irq_rt;
|
|
struct kvm_kernel_irq_routing_entry *e;
|
|
u32 gsi;
|
|
|
|
irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
|
|
lockdep_is_held(&kvm->irq_lock));
|
|
|
|
for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
|
|
hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
|
|
if (e->type == KVM_IRQ_ROUTING_HV_SINT)
|
|
kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
|
|
e->hv_sint.sint, gsi);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void synic_init(struct kvm_vcpu_hv_synic *synic)
|
|
{
|
|
int i;
|
|
|
|
memset(synic, 0, sizeof(*synic));
|
|
synic->version = HV_SYNIC_VERSION_1;
|
|
for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
|
|
atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
|
|
atomic_set(&synic->sint_to_gsi[i], -1);
|
|
}
|
|
}
|
|
|
|
static u64 get_time_ref_counter(struct kvm *kvm)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
struct kvm_vcpu *vcpu;
|
|
u64 tsc;
|
|
|
|
/*
|
|
* The guest has not set up the TSC page or the clock isn't
|
|
* stable, fall back to get_kvmclock_ns.
|
|
*/
|
|
if (!hv->tsc_ref.tsc_sequence)
|
|
return div_u64(get_kvmclock_ns(kvm), 100);
|
|
|
|
vcpu = kvm_get_vcpu(kvm, 0);
|
|
tsc = kvm_read_l1_tsc(vcpu, rdtsc());
|
|
return mul_u64_u64_shr(tsc, hv->tsc_ref.tsc_scale, 64)
|
|
+ hv->tsc_ref.tsc_offset;
|
|
}
|
|
|
|
static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
|
|
bool vcpu_kick)
|
|
{
|
|
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
|
|
|
|
set_bit(stimer->index,
|
|
to_hv_vcpu(vcpu)->stimer_pending_bitmap);
|
|
kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
|
|
if (vcpu_kick)
|
|
kvm_vcpu_kick(vcpu);
|
|
}
|
|
|
|
static void stimer_cleanup(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
|
|
|
|
trace_kvm_hv_stimer_cleanup(hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index);
|
|
|
|
hrtimer_cancel(&stimer->timer);
|
|
clear_bit(stimer->index,
|
|
to_hv_vcpu(vcpu)->stimer_pending_bitmap);
|
|
stimer->msg_pending = false;
|
|
stimer->exp_time = 0;
|
|
}
|
|
|
|
static enum hrtimer_restart stimer_timer_callback(struct hrtimer *timer)
|
|
{
|
|
struct kvm_vcpu_hv_stimer *stimer;
|
|
|
|
stimer = container_of(timer, struct kvm_vcpu_hv_stimer, timer);
|
|
trace_kvm_hv_stimer_callback(hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index);
|
|
stimer_mark_pending(stimer, true);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
/*
|
|
* stimer_start() assumptions:
|
|
* a) stimer->count is not equal to 0
|
|
* b) stimer->config has HV_STIMER_ENABLE flag
|
|
*/
|
|
static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
u64 time_now;
|
|
ktime_t ktime_now;
|
|
|
|
time_now = get_time_ref_counter(hv_stimer_to_vcpu(stimer)->kvm);
|
|
ktime_now = ktime_get();
|
|
|
|
if (stimer->config.periodic) {
|
|
if (stimer->exp_time) {
|
|
if (time_now >= stimer->exp_time) {
|
|
u64 remainder;
|
|
|
|
div64_u64_rem(time_now - stimer->exp_time,
|
|
stimer->count, &remainder);
|
|
stimer->exp_time =
|
|
time_now + (stimer->count - remainder);
|
|
}
|
|
} else
|
|
stimer->exp_time = time_now + stimer->count;
|
|
|
|
trace_kvm_hv_stimer_start_periodic(
|
|
hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index,
|
|
time_now, stimer->exp_time);
|
|
|
|
hrtimer_start(&stimer->timer,
|
|
ktime_add_ns(ktime_now,
|
|
100 * (stimer->exp_time - time_now)),
|
|
HRTIMER_MODE_ABS);
|
|
return 0;
|
|
}
|
|
stimer->exp_time = stimer->count;
|
|
if (time_now >= stimer->count) {
|
|
/*
|
|
* Expire timer according to Hypervisor Top-Level Functional
|
|
* specification v4(15.3.1):
|
|
* "If a one shot is enabled and the specified count is in
|
|
* the past, it will expire immediately."
|
|
*/
|
|
stimer_mark_pending(stimer, false);
|
|
return 0;
|
|
}
|
|
|
|
trace_kvm_hv_stimer_start_one_shot(hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index,
|
|
time_now, stimer->count);
|
|
|
|
hrtimer_start(&stimer->timer,
|
|
ktime_add_ns(ktime_now, 100 * (stimer->count - time_now)),
|
|
HRTIMER_MODE_ABS);
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
|
|
bool host)
|
|
{
|
|
union hv_stimer_config new_config = {.as_uint64 = config},
|
|
old_config = {.as_uint64 = stimer->config.as_uint64};
|
|
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
|
|
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
|
|
|
|
if (!synic->active && !host)
|
|
return 1;
|
|
|
|
trace_kvm_hv_stimer_set_config(hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index, config, host);
|
|
|
|
stimer_cleanup(stimer);
|
|
if (old_config.enable &&
|
|
!new_config.direct_mode && new_config.sintx == 0)
|
|
new_config.enable = 0;
|
|
stimer->config.as_uint64 = new_config.as_uint64;
|
|
|
|
if (stimer->config.enable)
|
|
stimer_mark_pending(stimer, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
|
|
bool host)
|
|
{
|
|
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
|
|
struct kvm_vcpu_hv_synic *synic = to_hv_synic(vcpu);
|
|
|
|
if (!synic->active && !host)
|
|
return 1;
|
|
|
|
trace_kvm_hv_stimer_set_count(hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index, count, host);
|
|
|
|
stimer_cleanup(stimer);
|
|
stimer->count = count;
|
|
if (stimer->count == 0)
|
|
stimer->config.enable = 0;
|
|
else if (stimer->config.auto_enable)
|
|
stimer->config.enable = 1;
|
|
|
|
if (stimer->config.enable)
|
|
stimer_mark_pending(stimer, false);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
|
|
{
|
|
*pconfig = stimer->config.as_uint64;
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_get_count(struct kvm_vcpu_hv_stimer *stimer, u64 *pcount)
|
|
{
|
|
*pcount = stimer->count;
|
|
return 0;
|
|
}
|
|
|
|
static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
|
|
struct hv_message *src_msg, bool no_retry)
|
|
{
|
|
struct kvm_vcpu *vcpu = hv_synic_to_vcpu(synic);
|
|
int msg_off = offsetof(struct hv_message_page, sint_message[sint]);
|
|
gfn_t msg_page_gfn;
|
|
struct hv_message_header hv_hdr;
|
|
int r;
|
|
|
|
if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
|
|
return -ENOENT;
|
|
|
|
msg_page_gfn = synic->msg_page >> PAGE_SHIFT;
|
|
|
|
/*
|
|
* Strictly following the spec-mandated ordering would assume setting
|
|
* .msg_pending before checking .message_type. However, this function
|
|
* is only called in vcpu context so the entire update is atomic from
|
|
* guest POV and thus the exact order here doesn't matter.
|
|
*/
|
|
r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type,
|
|
msg_off + offsetof(struct hv_message,
|
|
header.message_type),
|
|
sizeof(hv_hdr.message_type));
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (hv_hdr.message_type != HVMSG_NONE) {
|
|
if (no_retry)
|
|
return 0;
|
|
|
|
hv_hdr.message_flags.msg_pending = 1;
|
|
r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn,
|
|
&hv_hdr.message_flags,
|
|
msg_off +
|
|
offsetof(struct hv_message,
|
|
header.message_flags),
|
|
sizeof(hv_hdr.message_flags));
|
|
if (r < 0)
|
|
return r;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off,
|
|
sizeof(src_msg->header) +
|
|
src_msg->header.payload_size);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = synic_set_irq(synic, sint);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
|
|
struct hv_message *msg = &stimer->msg;
|
|
struct hv_timer_message_payload *payload =
|
|
(struct hv_timer_message_payload *)&msg->u.payload;
|
|
|
|
/*
|
|
* To avoid piling up periodic ticks, don't retry message
|
|
* delivery for them (within "lazy" lost ticks policy).
|
|
*/
|
|
bool no_retry = stimer->config.periodic;
|
|
|
|
payload->expiration_time = stimer->exp_time;
|
|
payload->delivery_time = get_time_ref_counter(vcpu->kvm);
|
|
return synic_deliver_msg(to_hv_synic(vcpu),
|
|
stimer->config.sintx, msg,
|
|
no_retry);
|
|
}
|
|
|
|
static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
struct kvm_vcpu *vcpu = hv_stimer_to_vcpu(stimer);
|
|
struct kvm_lapic_irq irq = {
|
|
.delivery_mode = APIC_DM_FIXED,
|
|
.vector = stimer->config.apic_vector
|
|
};
|
|
|
|
if (lapic_in_kernel(vcpu))
|
|
return !kvm_apic_set_irq(vcpu, &irq, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
int r, direct = stimer->config.direct_mode;
|
|
|
|
stimer->msg_pending = true;
|
|
if (!direct)
|
|
r = stimer_send_msg(stimer);
|
|
else
|
|
r = stimer_notify_direct(stimer);
|
|
trace_kvm_hv_stimer_expiration(hv_stimer_to_vcpu(stimer)->vcpu_id,
|
|
stimer->index, direct, r);
|
|
if (!r) {
|
|
stimer->msg_pending = false;
|
|
if (!(stimer->config.periodic))
|
|
stimer->config.enable = 0;
|
|
}
|
|
}
|
|
|
|
void kvm_hv_process_stimers(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
|
|
struct kvm_vcpu_hv_stimer *stimer;
|
|
u64 time_now, exp_time;
|
|
int i;
|
|
|
|
if (!hv_vcpu)
|
|
return;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
|
|
if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
|
|
stimer = &hv_vcpu->stimer[i];
|
|
if (stimer->config.enable) {
|
|
exp_time = stimer->exp_time;
|
|
|
|
if (exp_time) {
|
|
time_now =
|
|
get_time_ref_counter(vcpu->kvm);
|
|
if (time_now >= exp_time)
|
|
stimer_expiration(stimer);
|
|
}
|
|
|
|
if ((stimer->config.enable) &&
|
|
stimer->count) {
|
|
if (!stimer->msg_pending)
|
|
stimer_start(stimer);
|
|
} else
|
|
stimer_cleanup(stimer);
|
|
}
|
|
}
|
|
}
|
|
|
|
void kvm_hv_vcpu_uninit(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
|
|
int i;
|
|
|
|
if (!hv_vcpu)
|
|
return;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
|
|
stimer_cleanup(&hv_vcpu->stimer[i]);
|
|
|
|
kfree(hv_vcpu);
|
|
vcpu->arch.hyperv = NULL;
|
|
}
|
|
|
|
bool kvm_hv_assist_page_enabled(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
|
|
|
|
if (!hv_vcpu)
|
|
return false;
|
|
|
|
if (!(hv_vcpu->hv_vapic & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE))
|
|
return false;
|
|
return vcpu->arch.pv_eoi.msr_val & KVM_MSR_ENABLED;
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_hv_assist_page_enabled);
|
|
|
|
bool kvm_hv_get_assist_page(struct kvm_vcpu *vcpu,
|
|
struct hv_vp_assist_page *assist_page)
|
|
{
|
|
if (!kvm_hv_assist_page_enabled(vcpu))
|
|
return false;
|
|
return !kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.pv_eoi.data,
|
|
assist_page, sizeof(*assist_page));
|
|
}
|
|
EXPORT_SYMBOL_GPL(kvm_hv_get_assist_page);
|
|
|
|
static void stimer_prepare_msg(struct kvm_vcpu_hv_stimer *stimer)
|
|
{
|
|
struct hv_message *msg = &stimer->msg;
|
|
struct hv_timer_message_payload *payload =
|
|
(struct hv_timer_message_payload *)&msg->u.payload;
|
|
|
|
memset(&msg->header, 0, sizeof(msg->header));
|
|
msg->header.message_type = HVMSG_TIMER_EXPIRED;
|
|
msg->header.payload_size = sizeof(*payload);
|
|
|
|
payload->timer_index = stimer->index;
|
|
payload->expiration_time = 0;
|
|
payload->delivery_time = 0;
|
|
}
|
|
|
|
static void stimer_init(struct kvm_vcpu_hv_stimer *stimer, int timer_index)
|
|
{
|
|
memset(stimer, 0, sizeof(*stimer));
|
|
stimer->index = timer_index;
|
|
hrtimer_init(&stimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
|
|
stimer->timer.function = stimer_timer_callback;
|
|
stimer_prepare_msg(stimer);
|
|
}
|
|
|
|
static int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu;
|
|
int i;
|
|
|
|
hv_vcpu = kzalloc(sizeof(struct kvm_vcpu_hv), GFP_KERNEL_ACCOUNT);
|
|
if (!hv_vcpu)
|
|
return -ENOMEM;
|
|
|
|
vcpu->arch.hyperv = hv_vcpu;
|
|
hv_vcpu->vcpu = vcpu;
|
|
|
|
synic_init(&hv_vcpu->synic);
|
|
|
|
bitmap_zero(hv_vcpu->stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
|
|
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
|
|
stimer_init(&hv_vcpu->stimer[i], i);
|
|
|
|
hv_vcpu->vp_index = kvm_vcpu_get_idx(vcpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
|
|
{
|
|
struct kvm_vcpu_hv_synic *synic;
|
|
int r;
|
|
|
|
if (!to_hv_vcpu(vcpu)) {
|
|
r = kvm_hv_vcpu_init(vcpu);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
synic = to_hv_synic(vcpu);
|
|
|
|
/*
|
|
* Hyper-V SynIC auto EOI SINT's are
|
|
* not compatible with APICV, so request
|
|
* to deactivate APICV permanently.
|
|
*/
|
|
kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_HYPERV);
|
|
synic->active = true;
|
|
synic->dont_zero_synic_pages = dont_zero_synic_pages;
|
|
synic->control = HV_SYNIC_CONTROL_ENABLE;
|
|
return 0;
|
|
}
|
|
|
|
static bool kvm_hv_msr_partition_wide(u32 msr)
|
|
{
|
|
bool r = false;
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_GUEST_OS_ID:
|
|
case HV_X64_MSR_HYPERCALL:
|
|
case HV_X64_MSR_REFERENCE_TSC:
|
|
case HV_X64_MSR_TIME_REF_COUNT:
|
|
case HV_X64_MSR_CRASH_CTL:
|
|
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
|
|
case HV_X64_MSR_RESET:
|
|
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
|
|
case HV_X64_MSR_TSC_EMULATION_CONTROL:
|
|
case HV_X64_MSR_TSC_EMULATION_STATUS:
|
|
case HV_X64_MSR_SYNDBG_OPTIONS:
|
|
case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
|
|
r = true;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int kvm_hv_msr_get_crash_data(struct kvm *kvm, u32 index, u64 *pdata)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
size_t size = ARRAY_SIZE(hv->hv_crash_param);
|
|
|
|
if (WARN_ON_ONCE(index >= size))
|
|
return -EINVAL;
|
|
|
|
*pdata = hv->hv_crash_param[array_index_nospec(index, size)];
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_msr_get_crash_ctl(struct kvm *kvm, u64 *pdata)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
|
|
*pdata = hv->hv_crash_ctl;
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_msr_set_crash_ctl(struct kvm *kvm, u64 data)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
|
|
hv->hv_crash_ctl = data & HV_CRASH_CTL_CRASH_NOTIFY;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_msr_set_crash_data(struct kvm *kvm, u32 index, u64 data)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
size_t size = ARRAY_SIZE(hv->hv_crash_param);
|
|
|
|
if (WARN_ON_ONCE(index >= size))
|
|
return -EINVAL;
|
|
|
|
hv->hv_crash_param[array_index_nospec(index, size)] = data;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The kvmclock and Hyper-V TSC page use similar formulas, and converting
|
|
* between them is possible:
|
|
*
|
|
* kvmclock formula:
|
|
* nsec = (ticks - tsc_timestamp) * tsc_to_system_mul * 2^(tsc_shift-32)
|
|
* + system_time
|
|
*
|
|
* Hyper-V formula:
|
|
* nsec/100 = ticks * scale / 2^64 + offset
|
|
*
|
|
* When tsc_timestamp = system_time = 0, offset is zero in the Hyper-V formula.
|
|
* By dividing the kvmclock formula by 100 and equating what's left we get:
|
|
* ticks * scale / 2^64 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* scale / 2^64 = tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* scale = tsc_to_system_mul * 2^(32+tsc_shift) / 100
|
|
*
|
|
* Now expand the kvmclock formula and divide by 100:
|
|
* nsec = ticks * tsc_to_system_mul * 2^(tsc_shift-32)
|
|
* - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32)
|
|
* + system_time
|
|
* nsec/100 = ticks * tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* - tsc_timestamp * tsc_to_system_mul * 2^(tsc_shift-32) / 100
|
|
* + system_time / 100
|
|
*
|
|
* Replace tsc_to_system_mul * 2^(tsc_shift-32) / 100 by scale / 2^64:
|
|
* nsec/100 = ticks * scale / 2^64
|
|
* - tsc_timestamp * scale / 2^64
|
|
* + system_time / 100
|
|
*
|
|
* Equate with the Hyper-V formula so that ticks * scale / 2^64 cancels out:
|
|
* offset = system_time / 100 - tsc_timestamp * scale / 2^64
|
|
*
|
|
* These two equivalencies are implemented in this function.
|
|
*/
|
|
static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
|
|
struct ms_hyperv_tsc_page *tsc_ref)
|
|
{
|
|
u64 max_mul;
|
|
|
|
if (!(hv_clock->flags & PVCLOCK_TSC_STABLE_BIT))
|
|
return false;
|
|
|
|
/*
|
|
* check if scale would overflow, if so we use the time ref counter
|
|
* tsc_to_system_mul * 2^(tsc_shift+32) / 100 >= 2^64
|
|
* tsc_to_system_mul / 100 >= 2^(32-tsc_shift)
|
|
* tsc_to_system_mul >= 100 * 2^(32-tsc_shift)
|
|
*/
|
|
max_mul = 100ull << (32 - hv_clock->tsc_shift);
|
|
if (hv_clock->tsc_to_system_mul >= max_mul)
|
|
return false;
|
|
|
|
/*
|
|
* Otherwise compute the scale and offset according to the formulas
|
|
* derived above.
|
|
*/
|
|
tsc_ref->tsc_scale =
|
|
mul_u64_u32_div(1ULL << (32 + hv_clock->tsc_shift),
|
|
hv_clock->tsc_to_system_mul,
|
|
100);
|
|
|
|
tsc_ref->tsc_offset = hv_clock->system_time;
|
|
do_div(tsc_ref->tsc_offset, 100);
|
|
tsc_ref->tsc_offset -=
|
|
mul_u64_u64_shr(hv_clock->tsc_timestamp, tsc_ref->tsc_scale, 64);
|
|
return true;
|
|
}
|
|
|
|
void kvm_hv_setup_tsc_page(struct kvm *kvm,
|
|
struct pvclock_vcpu_time_info *hv_clock)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
u32 tsc_seq;
|
|
u64 gfn;
|
|
|
|
BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
|
|
BUILD_BUG_ON(offsetof(struct ms_hyperv_tsc_page, tsc_sequence) != 0);
|
|
|
|
if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
|
|
return;
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
|
|
goto out_unlock;
|
|
|
|
gfn = hv->hv_tsc_page >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
|
|
/*
|
|
* Because the TSC parameters only vary when there is a
|
|
* change in the master clock, do not bother with caching.
|
|
*/
|
|
if (unlikely(kvm_read_guest(kvm, gfn_to_gpa(gfn),
|
|
&tsc_seq, sizeof(tsc_seq))))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* While we're computing and writing the parameters, force the
|
|
* guest to use the time reference count MSR.
|
|
*/
|
|
hv->tsc_ref.tsc_sequence = 0;
|
|
if (kvm_write_guest(kvm, gfn_to_gpa(gfn),
|
|
&hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence)))
|
|
goto out_unlock;
|
|
|
|
if (!compute_tsc_page_parameters(hv_clock, &hv->tsc_ref))
|
|
goto out_unlock;
|
|
|
|
/* Ensure sequence is zero before writing the rest of the struct. */
|
|
smp_wmb();
|
|
if (kvm_write_guest(kvm, gfn_to_gpa(gfn), &hv->tsc_ref, sizeof(hv->tsc_ref)))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Now switch to the TSC page mechanism by writing the sequence.
|
|
*/
|
|
tsc_seq++;
|
|
if (tsc_seq == 0xFFFFFFFF || tsc_seq == 0)
|
|
tsc_seq = 1;
|
|
|
|
/* Write the struct entirely before the non-zero sequence. */
|
|
smp_wmb();
|
|
|
|
hv->tsc_ref.tsc_sequence = tsc_seq;
|
|
kvm_write_guest(kvm, gfn_to_gpa(gfn),
|
|
&hv->tsc_ref, sizeof(hv->tsc_ref.tsc_sequence));
|
|
out_unlock:
|
|
mutex_unlock(&hv->hv_lock);
|
|
}
|
|
|
|
static int kvm_hv_set_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data,
|
|
bool host)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_GUEST_OS_ID:
|
|
hv->hv_guest_os_id = data;
|
|
/* setting guest os id to zero disables hypercall page */
|
|
if (!hv->hv_guest_os_id)
|
|
hv->hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
|
|
break;
|
|
case HV_X64_MSR_HYPERCALL: {
|
|
u8 instructions[9];
|
|
int i = 0;
|
|
u64 addr;
|
|
|
|
/* if guest os id is not set hypercall should remain disabled */
|
|
if (!hv->hv_guest_os_id)
|
|
break;
|
|
if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
|
|
hv->hv_hypercall = data;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If Xen and Hyper-V hypercalls are both enabled, disambiguate
|
|
* the same way Xen itself does, by setting the bit 31 of EAX
|
|
* which is RsvdZ in the 32-bit Hyper-V hypercall ABI and just
|
|
* going to be clobbered on 64-bit.
|
|
*/
|
|
if (kvm_xen_hypercall_enabled(kvm)) {
|
|
/* orl $0x80000000, %eax */
|
|
instructions[i++] = 0x0d;
|
|
instructions[i++] = 0x00;
|
|
instructions[i++] = 0x00;
|
|
instructions[i++] = 0x00;
|
|
instructions[i++] = 0x80;
|
|
}
|
|
|
|
/* vmcall/vmmcall */
|
|
static_call(kvm_x86_patch_hypercall)(vcpu, instructions + i);
|
|
i += 3;
|
|
|
|
/* ret */
|
|
((unsigned char *)instructions)[i++] = 0xc3;
|
|
|
|
addr = data & HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_MASK;
|
|
if (kvm_vcpu_write_guest(vcpu, addr, instructions, i))
|
|
return 1;
|
|
hv->hv_hypercall = data;
|
|
break;
|
|
}
|
|
case HV_X64_MSR_REFERENCE_TSC:
|
|
hv->hv_tsc_page = data;
|
|
if (hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE)
|
|
kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
|
|
break;
|
|
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
|
|
return kvm_hv_msr_set_crash_data(kvm,
|
|
msr - HV_X64_MSR_CRASH_P0,
|
|
data);
|
|
case HV_X64_MSR_CRASH_CTL:
|
|
if (host)
|
|
return kvm_hv_msr_set_crash_ctl(kvm, data);
|
|
|
|
if (data & HV_CRASH_CTL_CRASH_NOTIFY) {
|
|
vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
|
|
hv->hv_crash_param[0],
|
|
hv->hv_crash_param[1],
|
|
hv->hv_crash_param[2],
|
|
hv->hv_crash_param[3],
|
|
hv->hv_crash_param[4]);
|
|
|
|
/* Send notification about crash to user space */
|
|
kvm_make_request(KVM_REQ_HV_CRASH, vcpu);
|
|
}
|
|
break;
|
|
case HV_X64_MSR_RESET:
|
|
if (data == 1) {
|
|
vcpu_debug(vcpu, "hyper-v reset requested\n");
|
|
kvm_make_request(KVM_REQ_HV_RESET, vcpu);
|
|
}
|
|
break;
|
|
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
|
|
hv->hv_reenlightenment_control = data;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_CONTROL:
|
|
hv->hv_tsc_emulation_control = data;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_STATUS:
|
|
hv->hv_tsc_emulation_status = data;
|
|
break;
|
|
case HV_X64_MSR_TIME_REF_COUNT:
|
|
/* read-only, but still ignore it if host-initiated */
|
|
if (!host)
|
|
return 1;
|
|
break;
|
|
case HV_X64_MSR_SYNDBG_OPTIONS:
|
|
case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
|
|
return syndbg_set_msr(vcpu, msr, data, host);
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
|
|
msr, data);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Calculate cpu time spent by current task in 100ns units */
|
|
static u64 current_task_runtime_100ns(void)
|
|
{
|
|
u64 utime, stime;
|
|
|
|
task_cputime_adjusted(current, &utime, &stime);
|
|
|
|
return div_u64(utime + stime, 100);
|
|
}
|
|
|
|
static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
|
|
{
|
|
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_VP_INDEX: {
|
|
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
|
|
int vcpu_idx = kvm_vcpu_get_idx(vcpu);
|
|
u32 new_vp_index = (u32)data;
|
|
|
|
if (!host || new_vp_index >= KVM_MAX_VCPUS)
|
|
return 1;
|
|
|
|
if (new_vp_index == hv_vcpu->vp_index)
|
|
return 0;
|
|
|
|
/*
|
|
* The VP index is initialized to vcpu_index by
|
|
* kvm_hv_vcpu_postcreate so they initially match. Now the
|
|
* VP index is changing, adjust num_mismatched_vp_indexes if
|
|
* it now matches or no longer matches vcpu_idx.
|
|
*/
|
|
if (hv_vcpu->vp_index == vcpu_idx)
|
|
atomic_inc(&hv->num_mismatched_vp_indexes);
|
|
else if (new_vp_index == vcpu_idx)
|
|
atomic_dec(&hv->num_mismatched_vp_indexes);
|
|
|
|
hv_vcpu->vp_index = new_vp_index;
|
|
break;
|
|
}
|
|
case HV_X64_MSR_VP_ASSIST_PAGE: {
|
|
u64 gfn;
|
|
unsigned long addr;
|
|
|
|
if (!(data & HV_X64_MSR_VP_ASSIST_PAGE_ENABLE)) {
|
|
hv_vcpu->hv_vapic = data;
|
|
if (kvm_lapic_enable_pv_eoi(vcpu, 0, 0))
|
|
return 1;
|
|
break;
|
|
}
|
|
gfn = data >> HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT;
|
|
addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
|
|
if (kvm_is_error_hva(addr))
|
|
return 1;
|
|
|
|
/*
|
|
* Clear apic_assist portion of struct hv_vp_assist_page
|
|
* only, there can be valuable data in the rest which needs
|
|
* to be preserved e.g. on migration.
|
|
*/
|
|
if (__put_user(0, (u32 __user *)addr))
|
|
return 1;
|
|
hv_vcpu->hv_vapic = data;
|
|
kvm_vcpu_mark_page_dirty(vcpu, gfn);
|
|
if (kvm_lapic_enable_pv_eoi(vcpu,
|
|
gfn_to_gpa(gfn) | KVM_MSR_ENABLED,
|
|
sizeof(struct hv_vp_assist_page)))
|
|
return 1;
|
|
break;
|
|
}
|
|
case HV_X64_MSR_EOI:
|
|
return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
|
|
case HV_X64_MSR_ICR:
|
|
return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
|
|
case HV_X64_MSR_TPR:
|
|
return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
|
|
case HV_X64_MSR_VP_RUNTIME:
|
|
if (!host)
|
|
return 1;
|
|
hv_vcpu->runtime_offset = data - current_task_runtime_100ns();
|
|
break;
|
|
case HV_X64_MSR_SCONTROL:
|
|
case HV_X64_MSR_SVERSION:
|
|
case HV_X64_MSR_SIEFP:
|
|
case HV_X64_MSR_SIMP:
|
|
case HV_X64_MSR_EOM:
|
|
case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
|
|
return synic_set_msr(to_hv_synic(vcpu), msr, data, host);
|
|
case HV_X64_MSR_STIMER0_CONFIG:
|
|
case HV_X64_MSR_STIMER1_CONFIG:
|
|
case HV_X64_MSR_STIMER2_CONFIG:
|
|
case HV_X64_MSR_STIMER3_CONFIG: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
|
|
|
|
return stimer_set_config(to_hv_stimer(vcpu, timer_index),
|
|
data, host);
|
|
}
|
|
case HV_X64_MSR_STIMER0_COUNT:
|
|
case HV_X64_MSR_STIMER1_COUNT:
|
|
case HV_X64_MSR_STIMER2_COUNT:
|
|
case HV_X64_MSR_STIMER3_COUNT: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
|
|
|
|
return stimer_set_count(to_hv_stimer(vcpu, timer_index),
|
|
data, host);
|
|
}
|
|
case HV_X64_MSR_TSC_FREQUENCY:
|
|
case HV_X64_MSR_APIC_FREQUENCY:
|
|
/* read-only, but still ignore it if host-initiated */
|
|
if (!host)
|
|
return 1;
|
|
break;
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
|
|
msr, data);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
|
|
bool host)
|
|
{
|
|
u64 data = 0;
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_GUEST_OS_ID:
|
|
data = hv->hv_guest_os_id;
|
|
break;
|
|
case HV_X64_MSR_HYPERCALL:
|
|
data = hv->hv_hypercall;
|
|
break;
|
|
case HV_X64_MSR_TIME_REF_COUNT:
|
|
data = get_time_ref_counter(kvm);
|
|
break;
|
|
case HV_X64_MSR_REFERENCE_TSC:
|
|
data = hv->hv_tsc_page;
|
|
break;
|
|
case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
|
|
return kvm_hv_msr_get_crash_data(kvm,
|
|
msr - HV_X64_MSR_CRASH_P0,
|
|
pdata);
|
|
case HV_X64_MSR_CRASH_CTL:
|
|
return kvm_hv_msr_get_crash_ctl(kvm, pdata);
|
|
case HV_X64_MSR_RESET:
|
|
data = 0;
|
|
break;
|
|
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
|
|
data = hv->hv_reenlightenment_control;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_CONTROL:
|
|
data = hv->hv_tsc_emulation_control;
|
|
break;
|
|
case HV_X64_MSR_TSC_EMULATION_STATUS:
|
|
data = hv->hv_tsc_emulation_status;
|
|
break;
|
|
case HV_X64_MSR_SYNDBG_OPTIONS:
|
|
case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
|
|
return syndbg_get_msr(vcpu, msr, pdata, host);
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
|
|
return 1;
|
|
}
|
|
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
|
|
static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
|
|
bool host)
|
|
{
|
|
u64 data = 0;
|
|
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
|
|
|
|
switch (msr) {
|
|
case HV_X64_MSR_VP_INDEX:
|
|
data = hv_vcpu->vp_index;
|
|
break;
|
|
case HV_X64_MSR_EOI:
|
|
return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
|
|
case HV_X64_MSR_ICR:
|
|
return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
|
|
case HV_X64_MSR_TPR:
|
|
return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
|
|
case HV_X64_MSR_VP_ASSIST_PAGE:
|
|
data = hv_vcpu->hv_vapic;
|
|
break;
|
|
case HV_X64_MSR_VP_RUNTIME:
|
|
data = current_task_runtime_100ns() + hv_vcpu->runtime_offset;
|
|
break;
|
|
case HV_X64_MSR_SCONTROL:
|
|
case HV_X64_MSR_SVERSION:
|
|
case HV_X64_MSR_SIEFP:
|
|
case HV_X64_MSR_SIMP:
|
|
case HV_X64_MSR_EOM:
|
|
case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
|
|
return synic_get_msr(to_hv_synic(vcpu), msr, pdata, host);
|
|
case HV_X64_MSR_STIMER0_CONFIG:
|
|
case HV_X64_MSR_STIMER1_CONFIG:
|
|
case HV_X64_MSR_STIMER2_CONFIG:
|
|
case HV_X64_MSR_STIMER3_CONFIG: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_CONFIG)/2;
|
|
|
|
return stimer_get_config(to_hv_stimer(vcpu, timer_index),
|
|
pdata);
|
|
}
|
|
case HV_X64_MSR_STIMER0_COUNT:
|
|
case HV_X64_MSR_STIMER1_COUNT:
|
|
case HV_X64_MSR_STIMER2_COUNT:
|
|
case HV_X64_MSR_STIMER3_COUNT: {
|
|
int timer_index = (msr - HV_X64_MSR_STIMER0_COUNT)/2;
|
|
|
|
return stimer_get_count(to_hv_stimer(vcpu, timer_index),
|
|
pdata);
|
|
}
|
|
case HV_X64_MSR_TSC_FREQUENCY:
|
|
data = (u64)vcpu->arch.virtual_tsc_khz * 1000;
|
|
break;
|
|
case HV_X64_MSR_APIC_FREQUENCY:
|
|
data = APIC_BUS_FREQUENCY;
|
|
break;
|
|
default:
|
|
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
|
|
return 1;
|
|
}
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
|
|
int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
|
|
|
|
if (!host && !vcpu->arch.hyperv_enabled)
|
|
return 1;
|
|
|
|
if (!to_hv_vcpu(vcpu)) {
|
|
if (kvm_hv_vcpu_init(vcpu))
|
|
return 1;
|
|
}
|
|
|
|
if (kvm_hv_msr_partition_wide(msr)) {
|
|
int r;
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
r = kvm_hv_set_msr_pw(vcpu, msr, data, host);
|
|
mutex_unlock(&hv->hv_lock);
|
|
return r;
|
|
} else
|
|
return kvm_hv_set_msr(vcpu, msr, data, host);
|
|
}
|
|
|
|
int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
|
|
|
|
if (!host && !vcpu->arch.hyperv_enabled)
|
|
return 1;
|
|
|
|
if (!to_hv_vcpu(vcpu)) {
|
|
if (kvm_hv_vcpu_init(vcpu))
|
|
return 1;
|
|
}
|
|
|
|
if (kvm_hv_msr_partition_wide(msr)) {
|
|
int r;
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
r = kvm_hv_get_msr_pw(vcpu, msr, pdata, host);
|
|
mutex_unlock(&hv->hv_lock);
|
|
return r;
|
|
} else
|
|
return kvm_hv_get_msr(vcpu, msr, pdata, host);
|
|
}
|
|
|
|
static __always_inline unsigned long *sparse_set_to_vcpu_mask(
|
|
struct kvm *kvm, u64 *sparse_banks, u64 valid_bank_mask,
|
|
u64 *vp_bitmap, unsigned long *vcpu_bitmap)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
struct kvm_vcpu *vcpu;
|
|
int i, bank, sbank = 0;
|
|
|
|
memset(vp_bitmap, 0,
|
|
KVM_HV_MAX_SPARSE_VCPU_SET_BITS * sizeof(*vp_bitmap));
|
|
for_each_set_bit(bank, (unsigned long *)&valid_bank_mask,
|
|
KVM_HV_MAX_SPARSE_VCPU_SET_BITS)
|
|
vp_bitmap[bank] = sparse_banks[sbank++];
|
|
|
|
if (likely(!atomic_read(&hv->num_mismatched_vp_indexes))) {
|
|
/* for all vcpus vp_index == vcpu_idx */
|
|
return (unsigned long *)vp_bitmap;
|
|
}
|
|
|
|
bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS);
|
|
kvm_for_each_vcpu(i, vcpu, kvm) {
|
|
if (test_bit(kvm_hv_get_vpindex(vcpu), (unsigned long *)vp_bitmap))
|
|
__set_bit(i, vcpu_bitmap);
|
|
}
|
|
return vcpu_bitmap;
|
|
}
|
|
|
|
static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, u64 ingpa, u16 rep_cnt, bool ex)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
|
|
struct hv_tlb_flush_ex flush_ex;
|
|
struct hv_tlb_flush flush;
|
|
u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
|
|
DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
|
|
unsigned long *vcpu_mask;
|
|
u64 valid_bank_mask;
|
|
u64 sparse_banks[64];
|
|
int sparse_banks_len;
|
|
bool all_cpus;
|
|
|
|
if (!ex) {
|
|
if (unlikely(kvm_read_guest(kvm, ingpa, &flush, sizeof(flush))))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
|
|
trace_kvm_hv_flush_tlb(flush.processor_mask,
|
|
flush.address_space, flush.flags);
|
|
|
|
valid_bank_mask = BIT_ULL(0);
|
|
sparse_banks[0] = flush.processor_mask;
|
|
|
|
/*
|
|
* Work around possible WS2012 bug: it sends hypercalls
|
|
* with processor_mask = 0x0 and HV_FLUSH_ALL_PROCESSORS clear,
|
|
* while also expecting us to flush something and crashing if
|
|
* we don't. Let's treat processor_mask == 0 same as
|
|
* HV_FLUSH_ALL_PROCESSORS.
|
|
*/
|
|
all_cpus = (flush.flags & HV_FLUSH_ALL_PROCESSORS) ||
|
|
flush.processor_mask == 0;
|
|
} else {
|
|
if (unlikely(kvm_read_guest(kvm, ingpa, &flush_ex,
|
|
sizeof(flush_ex))))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
|
|
trace_kvm_hv_flush_tlb_ex(flush_ex.hv_vp_set.valid_bank_mask,
|
|
flush_ex.hv_vp_set.format,
|
|
flush_ex.address_space,
|
|
flush_ex.flags);
|
|
|
|
valid_bank_mask = flush_ex.hv_vp_set.valid_bank_mask;
|
|
all_cpus = flush_ex.hv_vp_set.format !=
|
|
HV_GENERIC_SET_SPARSE_4K;
|
|
|
|
sparse_banks_len =
|
|
bitmap_weight((unsigned long *)&valid_bank_mask, 64) *
|
|
sizeof(sparse_banks[0]);
|
|
|
|
if (!sparse_banks_len && !all_cpus)
|
|
goto ret_success;
|
|
|
|
if (!all_cpus &&
|
|
kvm_read_guest(kvm,
|
|
ingpa + offsetof(struct hv_tlb_flush_ex,
|
|
hv_vp_set.bank_contents),
|
|
sparse_banks,
|
|
sparse_banks_len))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
}
|
|
|
|
cpumask_clear(&hv_vcpu->tlb_flush);
|
|
|
|
vcpu_mask = all_cpus ? NULL :
|
|
sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
|
|
vp_bitmap, vcpu_bitmap);
|
|
|
|
/*
|
|
* vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't
|
|
* analyze it here, flush TLB regardless of the specified address space.
|
|
*/
|
|
kvm_make_vcpus_request_mask(kvm, KVM_REQ_HV_TLB_FLUSH,
|
|
NULL, vcpu_mask, &hv_vcpu->tlb_flush);
|
|
|
|
ret_success:
|
|
/* We always do full TLB flush, set rep_done = rep_cnt. */
|
|
return (u64)HV_STATUS_SUCCESS |
|
|
((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET);
|
|
}
|
|
|
|
static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector,
|
|
unsigned long *vcpu_bitmap)
|
|
{
|
|
struct kvm_lapic_irq irq = {
|
|
.delivery_mode = APIC_DM_FIXED,
|
|
.vector = vector
|
|
};
|
|
struct kvm_vcpu *vcpu;
|
|
int i;
|
|
|
|
kvm_for_each_vcpu(i, vcpu, kvm) {
|
|
if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
|
|
continue;
|
|
|
|
/* We fail only when APIC is disabled */
|
|
kvm_apic_set_irq(vcpu, &irq, NULL);
|
|
}
|
|
}
|
|
|
|
static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, u64 ingpa, u64 outgpa,
|
|
bool ex, bool fast)
|
|
{
|
|
struct kvm *kvm = vcpu->kvm;
|
|
struct hv_send_ipi_ex send_ipi_ex;
|
|
struct hv_send_ipi send_ipi;
|
|
u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
|
|
DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
|
|
unsigned long *vcpu_mask;
|
|
unsigned long valid_bank_mask;
|
|
u64 sparse_banks[64];
|
|
int sparse_banks_len;
|
|
u32 vector;
|
|
bool all_cpus;
|
|
|
|
if (!ex) {
|
|
if (!fast) {
|
|
if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi,
|
|
sizeof(send_ipi))))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
sparse_banks[0] = send_ipi.cpu_mask;
|
|
vector = send_ipi.vector;
|
|
} else {
|
|
/* 'reserved' part of hv_send_ipi should be 0 */
|
|
if (unlikely(ingpa >> 32 != 0))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
sparse_banks[0] = outgpa;
|
|
vector = (u32)ingpa;
|
|
}
|
|
all_cpus = false;
|
|
valid_bank_mask = BIT_ULL(0);
|
|
|
|
trace_kvm_hv_send_ipi(vector, sparse_banks[0]);
|
|
} else {
|
|
if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi_ex,
|
|
sizeof(send_ipi_ex))))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
|
|
trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector,
|
|
send_ipi_ex.vp_set.format,
|
|
send_ipi_ex.vp_set.valid_bank_mask);
|
|
|
|
vector = send_ipi_ex.vector;
|
|
valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
|
|
sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) *
|
|
sizeof(sparse_banks[0]);
|
|
|
|
all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;
|
|
|
|
if (!sparse_banks_len)
|
|
goto ret_success;
|
|
|
|
if (!all_cpus &&
|
|
kvm_read_guest(kvm,
|
|
ingpa + offsetof(struct hv_send_ipi_ex,
|
|
vp_set.bank_contents),
|
|
sparse_banks,
|
|
sparse_banks_len))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
}
|
|
|
|
if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
|
|
vcpu_mask = all_cpus ? NULL :
|
|
sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
|
|
vp_bitmap, vcpu_bitmap);
|
|
|
|
kvm_send_ipi_to_many(kvm, vector, vcpu_mask);
|
|
|
|
ret_success:
|
|
return HV_STATUS_SUCCESS;
|
|
}
|
|
|
|
void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_cpuid_entry2 *entry;
|
|
|
|
entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_INTERFACE, 0);
|
|
if (entry && entry->eax == HYPERV_CPUID_SIGNATURE_EAX)
|
|
vcpu->arch.hyperv_enabled = true;
|
|
else
|
|
vcpu->arch.hyperv_enabled = false;
|
|
}
|
|
|
|
bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu)
|
|
{
|
|
return vcpu->arch.hyperv_enabled && to_kvm_hv(vcpu->kvm)->hv_guest_os_id;
|
|
}
|
|
|
|
static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
|
|
{
|
|
bool longmode;
|
|
|
|
longmode = is_64_bit_mode(vcpu);
|
|
if (longmode)
|
|
kvm_rax_write(vcpu, result);
|
|
else {
|
|
kvm_rdx_write(vcpu, result >> 32);
|
|
kvm_rax_write(vcpu, result & 0xffffffff);
|
|
}
|
|
}
|
|
|
|
static int kvm_hv_hypercall_complete(struct kvm_vcpu *vcpu, u64 result)
|
|
{
|
|
kvm_hv_hypercall_set_result(vcpu, result);
|
|
++vcpu->stat.hypercalls;
|
|
return kvm_skip_emulated_instruction(vcpu);
|
|
}
|
|
|
|
static int kvm_hv_hypercall_complete_userspace(struct kvm_vcpu *vcpu)
|
|
{
|
|
return kvm_hv_hypercall_complete(vcpu, vcpu->run->hyperv.u.hcall.result);
|
|
}
|
|
|
|
static u16 kvm_hvcall_signal_event(struct kvm_vcpu *vcpu, bool fast, u64 param)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
|
|
struct eventfd_ctx *eventfd;
|
|
|
|
if (unlikely(!fast)) {
|
|
int ret;
|
|
gpa_t gpa = param;
|
|
|
|
if ((gpa & (__alignof__(param) - 1)) ||
|
|
offset_in_page(gpa) + sizeof(param) > PAGE_SIZE)
|
|
return HV_STATUS_INVALID_ALIGNMENT;
|
|
|
|
ret = kvm_vcpu_read_guest(vcpu, gpa, ¶m, sizeof(param));
|
|
if (ret < 0)
|
|
return HV_STATUS_INVALID_ALIGNMENT;
|
|
}
|
|
|
|
/*
|
|
* Per spec, bits 32-47 contain the extra "flag number". However, we
|
|
* have no use for it, and in all known usecases it is zero, so just
|
|
* report lookup failure if it isn't.
|
|
*/
|
|
if (param & 0xffff00000000ULL)
|
|
return HV_STATUS_INVALID_PORT_ID;
|
|
/* remaining bits are reserved-zero */
|
|
if (param & ~KVM_HYPERV_CONN_ID_MASK)
|
|
return HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
|
|
/* the eventfd is protected by vcpu->kvm->srcu, but conn_to_evt isn't */
|
|
rcu_read_lock();
|
|
eventfd = idr_find(&hv->conn_to_evt, param);
|
|
rcu_read_unlock();
|
|
if (!eventfd)
|
|
return HV_STATUS_INVALID_PORT_ID;
|
|
|
|
eventfd_signal(eventfd, 1);
|
|
return HV_STATUS_SUCCESS;
|
|
}
|
|
|
|
int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS;
|
|
uint16_t code, rep_idx, rep_cnt;
|
|
bool fast, rep;
|
|
|
|
/*
|
|
* hypercall generates UD from non zero cpl and real mode
|
|
* per HYPER-V spec
|
|
*/
|
|
if (static_call(kvm_x86_get_cpl)(vcpu) != 0 || !is_protmode(vcpu)) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (is_64_bit_mode(vcpu)) {
|
|
param = kvm_rcx_read(vcpu);
|
|
ingpa = kvm_rdx_read(vcpu);
|
|
outgpa = kvm_r8_read(vcpu);
|
|
} else
|
|
#endif
|
|
{
|
|
param = ((u64)kvm_rdx_read(vcpu) << 32) |
|
|
(kvm_rax_read(vcpu) & 0xffffffff);
|
|
ingpa = ((u64)kvm_rbx_read(vcpu) << 32) |
|
|
(kvm_rcx_read(vcpu) & 0xffffffff);
|
|
outgpa = ((u64)kvm_rdi_read(vcpu) << 32) |
|
|
(kvm_rsi_read(vcpu) & 0xffffffff);
|
|
}
|
|
|
|
code = param & 0xffff;
|
|
fast = !!(param & HV_HYPERCALL_FAST_BIT);
|
|
rep_cnt = (param >> HV_HYPERCALL_REP_COMP_OFFSET) & 0xfff;
|
|
rep_idx = (param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff;
|
|
rep = !!(rep_cnt || rep_idx);
|
|
|
|
trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
|
|
|
|
switch (code) {
|
|
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
|
|
if (unlikely(rep)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
kvm_vcpu_on_spin(vcpu, true);
|
|
break;
|
|
case HVCALL_SIGNAL_EVENT:
|
|
if (unlikely(rep)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hvcall_signal_event(vcpu, fast, ingpa);
|
|
if (ret != HV_STATUS_INVALID_PORT_ID)
|
|
break;
|
|
fallthrough; /* maybe userspace knows this conn_id */
|
|
case HVCALL_POST_MESSAGE:
|
|
/* don't bother userspace if it has no way to handle it */
|
|
if (unlikely(rep || !to_hv_synic(vcpu)->active)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
vcpu->run->exit_reason = KVM_EXIT_HYPERV;
|
|
vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
|
|
vcpu->run->hyperv.u.hcall.input = param;
|
|
vcpu->run->hyperv.u.hcall.params[0] = ingpa;
|
|
vcpu->run->hyperv.u.hcall.params[1] = outgpa;
|
|
vcpu->arch.complete_userspace_io =
|
|
kvm_hv_hypercall_complete_userspace;
|
|
return 0;
|
|
case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
|
|
if (unlikely(fast || !rep_cnt || rep_idx)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false);
|
|
break;
|
|
case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
|
|
if (unlikely(fast || rep)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, false);
|
|
break;
|
|
case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
|
|
if (unlikely(fast || !rep_cnt || rep_idx)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
|
|
break;
|
|
case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
|
|
if (unlikely(fast || rep)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
|
|
break;
|
|
case HVCALL_SEND_IPI:
|
|
if (unlikely(rep)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, false, fast);
|
|
break;
|
|
case HVCALL_SEND_IPI_EX:
|
|
if (unlikely(fast || rep)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
|
|
break;
|
|
}
|
|
ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false);
|
|
break;
|
|
case HVCALL_POST_DEBUG_DATA:
|
|
case HVCALL_RETRIEVE_DEBUG_DATA:
|
|
if (unlikely(fast)) {
|
|
ret = HV_STATUS_INVALID_PARAMETER;
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case HVCALL_RESET_DEBUG_SESSION: {
|
|
struct kvm_hv_syndbg *syndbg = to_hv_syndbg(vcpu);
|
|
|
|
if (!kvm_hv_is_syndbg_enabled(vcpu)) {
|
|
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
|
|
break;
|
|
}
|
|
|
|
if (!(syndbg->options & HV_X64_SYNDBG_OPTION_USE_HCALLS)) {
|
|
ret = HV_STATUS_OPERATION_DENIED;
|
|
break;
|
|
}
|
|
vcpu->run->exit_reason = KVM_EXIT_HYPERV;
|
|
vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
|
|
vcpu->run->hyperv.u.hcall.input = param;
|
|
vcpu->run->hyperv.u.hcall.params[0] = ingpa;
|
|
vcpu->run->hyperv.u.hcall.params[1] = outgpa;
|
|
vcpu->arch.complete_userspace_io =
|
|
kvm_hv_hypercall_complete_userspace;
|
|
return 0;
|
|
}
|
|
default:
|
|
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
|
|
break;
|
|
}
|
|
|
|
return kvm_hv_hypercall_complete(vcpu, ret);
|
|
}
|
|
|
|
void kvm_hv_init_vm(struct kvm *kvm)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
|
|
mutex_init(&hv->hv_lock);
|
|
idr_init(&hv->conn_to_evt);
|
|
}
|
|
|
|
void kvm_hv_destroy_vm(struct kvm *kvm)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
struct eventfd_ctx *eventfd;
|
|
int i;
|
|
|
|
idr_for_each_entry(&hv->conn_to_evt, eventfd, i)
|
|
eventfd_ctx_put(eventfd);
|
|
idr_destroy(&hv->conn_to_evt);
|
|
}
|
|
|
|
static int kvm_hv_eventfd_assign(struct kvm *kvm, u32 conn_id, int fd)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
struct eventfd_ctx *eventfd;
|
|
int ret;
|
|
|
|
eventfd = eventfd_ctx_fdget(fd);
|
|
if (IS_ERR(eventfd))
|
|
return PTR_ERR(eventfd);
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1,
|
|
GFP_KERNEL_ACCOUNT);
|
|
mutex_unlock(&hv->hv_lock);
|
|
|
|
if (ret >= 0)
|
|
return 0;
|
|
|
|
if (ret == -ENOSPC)
|
|
ret = -EEXIST;
|
|
eventfd_ctx_put(eventfd);
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_hv_eventfd_deassign(struct kvm *kvm, u32 conn_id)
|
|
{
|
|
struct kvm_hv *hv = to_kvm_hv(kvm);
|
|
struct eventfd_ctx *eventfd;
|
|
|
|
mutex_lock(&hv->hv_lock);
|
|
eventfd = idr_remove(&hv->conn_to_evt, conn_id);
|
|
mutex_unlock(&hv->hv_lock);
|
|
|
|
if (!eventfd)
|
|
return -ENOENT;
|
|
|
|
synchronize_srcu(&kvm->srcu);
|
|
eventfd_ctx_put(eventfd);
|
|
return 0;
|
|
}
|
|
|
|
int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args)
|
|
{
|
|
if ((args->flags & ~KVM_HYPERV_EVENTFD_DEASSIGN) ||
|
|
(args->conn_id & ~KVM_HYPERV_CONN_ID_MASK))
|
|
return -EINVAL;
|
|
|
|
if (args->flags == KVM_HYPERV_EVENTFD_DEASSIGN)
|
|
return kvm_hv_eventfd_deassign(kvm, args->conn_id);
|
|
return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd);
|
|
}
|
|
|
|
int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
|
|
struct kvm_cpuid_entry2 __user *entries)
|
|
{
|
|
uint16_t evmcs_ver = 0;
|
|
struct kvm_cpuid_entry2 cpuid_entries[] = {
|
|
{ .function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS },
|
|
{ .function = HYPERV_CPUID_INTERFACE },
|
|
{ .function = HYPERV_CPUID_VERSION },
|
|
{ .function = HYPERV_CPUID_FEATURES },
|
|
{ .function = HYPERV_CPUID_ENLIGHTMENT_INFO },
|
|
{ .function = HYPERV_CPUID_IMPLEMENT_LIMITS },
|
|
{ .function = HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS },
|
|
{ .function = HYPERV_CPUID_SYNDBG_INTERFACE },
|
|
{ .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES },
|
|
{ .function = HYPERV_CPUID_NESTED_FEATURES },
|
|
};
|
|
int i, nent = ARRAY_SIZE(cpuid_entries);
|
|
|
|
if (kvm_x86_ops.nested_ops->get_evmcs_version)
|
|
evmcs_ver = kvm_x86_ops.nested_ops->get_evmcs_version(vcpu);
|
|
|
|
/* Skip NESTED_FEATURES if eVMCS is not supported */
|
|
if (!evmcs_ver)
|
|
--nent;
|
|
|
|
if (cpuid->nent < nent)
|
|
return -E2BIG;
|
|
|
|
if (cpuid->nent > nent)
|
|
cpuid->nent = nent;
|
|
|
|
for (i = 0; i < nent; i++) {
|
|
struct kvm_cpuid_entry2 *ent = &cpuid_entries[i];
|
|
u32 signature[3];
|
|
|
|
switch (ent->function) {
|
|
case HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS:
|
|
memcpy(signature, "Linux KVM Hv", 12);
|
|
|
|
ent->eax = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES;
|
|
ent->ebx = signature[0];
|
|
ent->ecx = signature[1];
|
|
ent->edx = signature[2];
|
|
break;
|
|
|
|
case HYPERV_CPUID_INTERFACE:
|
|
ent->eax = HYPERV_CPUID_SIGNATURE_EAX;
|
|
break;
|
|
|
|
case HYPERV_CPUID_VERSION:
|
|
/*
|
|
* We implement some Hyper-V 2016 functions so let's use
|
|
* this version.
|
|
*/
|
|
ent->eax = 0x00003839;
|
|
ent->ebx = 0x000A0000;
|
|
break;
|
|
|
|
case HYPERV_CPUID_FEATURES:
|
|
ent->eax |= HV_MSR_VP_RUNTIME_AVAILABLE;
|
|
ent->eax |= HV_MSR_TIME_REF_COUNT_AVAILABLE;
|
|
ent->eax |= HV_MSR_SYNIC_AVAILABLE;
|
|
ent->eax |= HV_MSR_SYNTIMER_AVAILABLE;
|
|
ent->eax |= HV_MSR_APIC_ACCESS_AVAILABLE;
|
|
ent->eax |= HV_MSR_HYPERCALL_AVAILABLE;
|
|
ent->eax |= HV_MSR_VP_INDEX_AVAILABLE;
|
|
ent->eax |= HV_MSR_RESET_AVAILABLE;
|
|
ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE;
|
|
ent->eax |= HV_ACCESS_FREQUENCY_MSRS;
|
|
ent->eax |= HV_ACCESS_REENLIGHTENMENT;
|
|
|
|
ent->ebx |= HV_POST_MESSAGES;
|
|
ent->ebx |= HV_SIGNAL_EVENTS;
|
|
|
|
ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
|
|
ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
|
|
|
|
ent->ebx |= HV_DEBUGGING;
|
|
ent->edx |= HV_X64_GUEST_DEBUGGING_AVAILABLE;
|
|
ent->edx |= HV_FEATURE_DEBUG_MSRS_AVAILABLE;
|
|
|
|
/*
|
|
* Direct Synthetic timers only make sense with in-kernel
|
|
* LAPIC
|
|
*/
|
|
if (!vcpu || lapic_in_kernel(vcpu))
|
|
ent->edx |= HV_STIMER_DIRECT_MODE_AVAILABLE;
|
|
|
|
break;
|
|
|
|
case HYPERV_CPUID_ENLIGHTMENT_INFO:
|
|
ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
|
|
ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
|
|
ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
|
|
ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED;
|
|
ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED;
|
|
if (evmcs_ver)
|
|
ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
|
|
if (!cpu_smt_possible())
|
|
ent->eax |= HV_X64_NO_NONARCH_CORESHARING;
|
|
/*
|
|
* Default number of spinlock retry attempts, matches
|
|
* HyperV 2016.
|
|
*/
|
|
ent->ebx = 0x00000FFF;
|
|
|
|
break;
|
|
|
|
case HYPERV_CPUID_IMPLEMENT_LIMITS:
|
|
/* Maximum number of virtual processors */
|
|
ent->eax = KVM_MAX_VCPUS;
|
|
/*
|
|
* Maximum number of logical processors, matches
|
|
* HyperV 2016.
|
|
*/
|
|
ent->ebx = 64;
|
|
|
|
break;
|
|
|
|
case HYPERV_CPUID_NESTED_FEATURES:
|
|
ent->eax = evmcs_ver;
|
|
|
|
break;
|
|
|
|
case HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS:
|
|
memcpy(signature, "Linux KVM Hv", 12);
|
|
|
|
ent->eax = 0;
|
|
ent->ebx = signature[0];
|
|
ent->ecx = signature[1];
|
|
ent->edx = signature[2];
|
|
break;
|
|
|
|
case HYPERV_CPUID_SYNDBG_INTERFACE:
|
|
memcpy(signature, "VS#1\0\0\0\0\0\0\0\0", 12);
|
|
ent->eax = signature[0];
|
|
break;
|
|
|
|
case HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES:
|
|
ent->eax |= HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (copy_to_user(entries, cpuid_entries,
|
|
nent * sizeof(struct kvm_cpuid_entry2)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|