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KVM/arm64 fixes for 5.11, take #1

Browse Source 
- VM init cleanups
 - PSCI relay cleanups
 - Kill CONFIG_KVM_ARM_PMU
 - Fixup __init annotations
 - Fixup reg_to_encoding()
 - Fix spurious PMCR_EL0 access
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Merge tag 'kvmarm-fixes-5.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/arm64 fixes for 5.11, take #1

- VM init cleanups
- PSCI relay cleanups
- Kill CONFIG_KVM_ARM_PMU
- Fixup __init annotations
- Fixup reg_to_encoding()
- Fix spurious PMCR_EL0 access
This commit is contained in:
Paolo Bonzini 2021-01-08 05:02:40 -05:00
commit 774206bc03
19 changed files with 122 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/virt/kvm/api.rst
View File

@ -392,9 +392,14 @@ This ioctl is obsolete and has been removed.
Errors:
===== =============================
======= ==============================================================
EINTR an unmasked signal is pending
===== =============================
ENOEXEC the vcpu hasn't been initialized or the guest tried to execute
instructions from device memory (arm64)
ENOSYS data abort outside memslots with no syndrome info and
KVM_CAP_ARM_NISV_TO_USER not enabled (arm64)
EPERM SVE feature set but not finalized (arm64)
======= ==============================================================
This ioctl is used to run a guest virtual cpu. While there are no
explicit parameters, there is an implicit parameter block that can be

23
arch/arm64/include/asm/kvm_host.h
View File

@ -17,6 +17,7 @@
#include <linux/jump_label.h>
#include <linux/kvm_types.h>
#include <linux/percpu.h>
#include <linux/psci.h>
#include <asm/arch_gicv3.h>
#include <asm/barrier.h>
#include <asm/cpufeature.h>
@ -240,6 +241,28 @@ struct kvm_host_data {
struct kvm_pmu_events pmu_events;
};
struct kvm_host_psci_config {
/* PSCI version used by host. */
u32 version;
/* Function IDs used by host if version is v0.1. */
struct psci_0_1_function_ids function_ids_0_1;
bool psci_0_1_cpu_suspend_implemented;
bool psci_0_1_cpu_on_implemented;
bool psci_0_1_cpu_off_implemented;
bool psci_0_1_migrate_implemented;
};
extern struct kvm_host_psci_config kvm_nvhe_sym(kvm_host_psci_config);
#define kvm_host_psci_config CHOOSE_NVHE_SYM(kvm_host_psci_config)
extern s64 kvm_nvhe_sym(hyp_physvirt_offset);
#define hyp_physvirt_offset CHOOSE_NVHE_SYM(hyp_physvirt_offset)
extern u64 kvm_nvhe_sym(hyp_cpu_logical_map)[NR_CPUS];
#define hyp_cpu_logical_map CHOOSE_NVHE_SYM(hyp_cpu_logical_map)
struct vcpu_reset_state {
unsigned long pc;
unsigned long r0;

2
arch/arm64/kernel/cpufeature.c
View File

@ -2558,7 +2558,7 @@ static void verify_hyp_capabilities(void)
int parange, ipa_max;
unsigned int safe_vmid_bits, vmid_bits;
if (!IS_ENABLED(CONFIG_KVM) || !IS_ENABLED(CONFIG_KVM_ARM_HOST))
if (!IS_ENABLED(CONFIG_KVM))
return;
safe_mmfr1 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);

2
arch/arm64/kernel/smp.c
View File

@ -434,7 +434,7 @@ static void __init hyp_mode_check(void)
"CPU: CPUs started in inconsistent modes");
else
pr_info("CPU: All CPU(s) started at EL1\n");
if (IS_ENABLED(CONFIG_KVM))
if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode())
kvm_compute_layout();
}

8
arch/arm64/kvm/Kconfig
View File

@ -49,14 +49,6 @@ if KVM
source "virt/kvm/Kconfig"
config KVM_ARM_PMU
bool "Virtual Performance Monitoring Unit (PMU) support"
depends on HW_PERF_EVENTS
default y
help
Adds support for a virtual Performance Monitoring Unit (PMU) in
virtual machines.
endif # KVM
endif # VIRTUALIZATION

2
arch/arm64/kvm/Makefile
View File

@ -24,4 +24,4 @@ kvm-y := $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o \
vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \
vgic/vgic-its.o vgic/vgic-debug.o
kvm-$(CONFIG_KVM_ARM_PMU) += pmu-emul.o
kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o

7
arch/arm64/kvm/arch_timer.c
View File

@ -1129,9 +1129,10 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
if (!irqchip_in_kernel(vcpu->kvm))
goto no_vgic;
if (!vgic_initialized(vcpu->kvm))
return -ENODEV;
/*
* At this stage, we have the guarantee that the vgic is both
* available and initialized.
*/
if (!timer_irqs_are_valid(vcpu)) {
kvm_debug("incorrectly configured timer irqs\n");
return -EINVAL;

32
arch/arm64/kvm/arm.c
View File

@ -65,10 +65,6 @@ static bool vgic_present;
static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
extern u64 kvm_nvhe_sym(__cpu_logical_map)[NR_CPUS];
extern u32 kvm_nvhe_sym(kvm_host_psci_version);
extern struct psci_0_1_function_ids kvm_nvhe_sym(kvm_host_psci_0_1_function_ids);
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
@ -584,11 +580,9 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
* Map the VGIC hardware resources before running a vcpu the
* first time on this VM.
*/
if (unlikely(!vgic_ready(kvm))) {
ret = kvm_vgic_map_resources(kvm);
if (ret)
return ret;
}
ret = kvm_vgic_map_resources(kvm);
if (ret)
return ret;
} else {
/*
* Tell the rest of the code that there are userspace irqchip
@ -1574,12 +1568,12 @@ static struct notifier_block hyp_init_cpu_pm_nb = {
.notifier_call = hyp_init_cpu_pm_notifier,
};
static void __init hyp_cpu_pm_init(void)
static void hyp_cpu_pm_init(void)
{
if (!is_protected_kvm_enabled())
cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
}
static void __init hyp_cpu_pm_exit(void)
static void hyp_cpu_pm_exit(void)
{
if (!is_protected_kvm_enabled())
cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
@ -1604,9 +1598,12 @@ static void init_cpu_logical_map(void)
* allow any other CPUs from the `possible` set to boot.
*/
for_each_online_cpu(cpu)
kvm_nvhe_sym(__cpu_logical_map)[cpu] = cpu_logical_map(cpu);
hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu);
}
#define init_psci_0_1_impl_state(config, what) \
config.psci_0_1_ ## what ## _implemented = psci_ops.what
static bool init_psci_relay(void)
{
/*
@ -1618,8 +1615,15 @@ static bool init_psci_relay(void)
return false;
}
kvm_nvhe_sym(kvm_host_psci_version) = psci_ops.get_version();
kvm_nvhe_sym(kvm_host_psci_0_1_function_ids) = get_psci_0_1_function_ids();
kvm_host_psci_config.version = psci_ops.get_version();
if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) {
kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids();
init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend);
init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on);
init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off);
init_psci_0_1_impl_state(kvm_host_psci_config, migrate);
}
return true;
}

9
arch/arm64/kvm/hyp/include/hyp/adjust_pc.h
View File

@ -59,4 +59,13 @@ static inline void __adjust_pc(struct kvm_vcpu *vcpu)
}
}
/*
* Skip an instruction while host sysregs are live.
* Assumes host is always 64-bit.
*/
static inline void kvm_skip_host_instr(void)
{
write_sysreg_el2(read_sysreg_el2(SYS_ELR) + 4, SYS_ELR);
}
#endif

12
arch/arm64/kvm/hyp/nvhe/hyp-main.c
View File

@ -157,11 +157,6 @@ static void default_host_smc_handler(struct kvm_cpu_context *host_ctxt)
__kvm_hyp_host_forward_smc(host_ctxt);
}
static void skip_host_instruction(void)
{
write_sysreg_el2(read_sysreg_el2(SYS_ELR) + 4, SYS_ELR);
}
static void handle_host_smc(struct kvm_cpu_context *host_ctxt)
{
bool handled;
@ -170,11 +165,8 @@ static void handle_host_smc(struct kvm_cpu_context *host_ctxt)
if (!handled)
default_host_smc_handler(host_ctxt);
/*
* Unlike HVC, the return address of an SMC is the instruction's PC.
* Move the return address past the instruction.
*/
skip_host_instruction();
/* SMC was trapped, move ELR past the current PC. */
kvm_skip_host_instr();
}
void handle_trap(struct kvm_cpu_context *host_ctxt)

6
arch/arm64/kvm/hyp/nvhe/hyp-smp.c
View File

@ -14,14 +14,14 @@
* Other CPUs should not be allowed to boot because their features were
* not checked against the finalized system capabilities.
*/
u64 __ro_after_init __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
u64 __ro_after_init hyp_cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
u64 cpu_logical_map(unsigned int cpu)
{
if (cpu >= ARRAY_SIZE(__cpu_logical_map))
if (cpu >= ARRAY_SIZE(hyp_cpu_logical_map))
hyp_panic();
return __cpu_logical_map[cpu];
return hyp_cpu_logical_map[cpu];
}
unsigned long __hyp_per_cpu_offset(unsigned int cpu)

59
arch/arm64/kvm/hyp/nvhe/psci-relay.c
View File

@ -7,11 +7,8 @@
#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>
#include <asm/kvm_mmu.h>
#include <kvm/arm_hypercalls.h>
#include <linux/arm-smccc.h>
#include <linux/kvm_host.h>
#include <linux/psci.h>
#include <kvm/arm_psci.h>
#include <uapi/linux/psci.h>
#include <nvhe/trap_handler.h>
@ -22,9 +19,8 @@ void kvm_hyp_cpu_resume(unsigned long r0);
void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
/* Config options set by the host. */
__ro_after_init u32 kvm_host_psci_version;
__ro_after_init struct psci_0_1_function_ids kvm_host_psci_0_1_function_ids;
__ro_after_init s64 hyp_physvirt_offset;
struct kvm_host_psci_config __ro_after_init kvm_host_psci_config;
s64 __ro_after_init hyp_physvirt_offset;
#define __hyp_pa(x) ((phys_addr_t)((x)) + hyp_physvirt_offset)
@ -47,19 +43,16 @@ struct psci_boot_args {
static DEFINE_PER_CPU(struct psci_boot_args, cpu_on_args) = PSCI_BOOT_ARGS_INIT;
static DEFINE_PER_CPU(struct psci_boot_args, suspend_args) = PSCI_BOOT_ARGS_INIT;
static u64 get_psci_func_id(struct kvm_cpu_context *host_ctxt)
{
DECLARE_REG(u64, func_id, host_ctxt, 0);
return func_id;
}
#define is_psci_0_1(what, func_id) \
(kvm_host_psci_config.psci_0_1_ ## what ## _implemented && \
(func_id) == kvm_host_psci_config.function_ids_0_1.what)
static bool is_psci_0_1_call(u64 func_id)
{
return (func_id == kvm_host_psci_0_1_function_ids.cpu_suspend) ||
(func_id == kvm_host_psci_0_1_function_ids.cpu_on) ||
(func_id == kvm_host_psci_0_1_function_ids.cpu_off) ||
(func_id == kvm_host_psci_0_1_function_ids.migrate);
return (is_psci_0_1(cpu_suspend, func_id) ||
is_psci_0_1(cpu_on, func_id) ||
is_psci_0_1(cpu_off, func_id) ||
is_psci_0_1(migrate, func_id));
}
static bool is_psci_0_2_call(u64 func_id)
@ -69,16 +62,6 @@ static bool is_psci_0_2_call(u64 func_id)
(PSCI_0_2_FN64(0) <= func_id && func_id <= PSCI_0_2_FN64(31));
}
static bool is_psci_call(u64 func_id)
{
switch (kvm_host_psci_version) {
case PSCI_VERSION(0, 1):
return is_psci_0_1_call(func_id);
default:
return is_psci_0_2_call(func_id);
}
}
static unsigned long psci_call(unsigned long fn, unsigned long arg0,
unsigned long arg1, unsigned long arg2)
{
@ -248,15 +231,14 @@ asmlinkage void __noreturn kvm_host_psci_cpu_entry(bool is_cpu_on)
static unsigned long psci_0_1_handler(u64 func_id, struct kvm_cpu_context *host_ctxt)
{
if ((func_id == kvm_host_psci_0_1_function_ids.cpu_off) ||
(func_id == kvm_host_psci_0_1_function_ids.migrate))
if (is_psci_0_1(cpu_off, func_id) || is_psci_0_1(migrate, func_id))
return psci_forward(host_ctxt);
else if (func_id == kvm_host_psci_0_1_function_ids.cpu_on)
if (is_psci_0_1(cpu_on, func_id))
return psci_cpu_on(func_id, host_ctxt);
else if (func_id == kvm_host_psci_0_1_function_ids.cpu_suspend)
if (is_psci_0_1(cpu_suspend, func_id))
return psci_cpu_suspend(func_id, host_ctxt);
else
return PSCI_RET_NOT_SUPPORTED;
return PSCI_RET_NOT_SUPPORTED;
}
static unsigned long psci_0_2_handler(u64 func_id, struct kvm_cpu_context *host_ctxt)
@ -298,20 +280,23 @@ static unsigned long psci_1_0_handler(u64 func_id, struct kvm_cpu_context *host_
bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt)
{
u64 func_id = get_psci_func_id(host_ctxt);
DECLARE_REG(u64, func_id, host_ctxt, 0);
unsigned long ret;
if (!is_psci_call(func_id))
return false;
switch (kvm_host_psci_version) {
switch (kvm_host_psci_config.version) {
case PSCI_VERSION(0, 1):
if (!is_psci_0_1_call(func_id))
return false;
ret = psci_0_1_handler(func_id, host_ctxt);
break;
case PSCI_VERSION(0, 2):
if (!is_psci_0_2_call(func_id))
return false;
ret = psci_0_2_handler(func_id, host_ctxt);
break;
default:
if (!is_psci_0_2_call(func_id))
return false;
ret = psci_1_0_handler(func_id, host_ctxt);
break;
}

2
arch/arm64/kvm/pmu-emul.c
View File

@ -850,8 +850,6 @@ int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu)
return -EINVAL;
}
kvm_pmu_vcpu_reset(vcpu);
return 0;
}

6
arch/arm64/kvm/sys_regs.c
View File

@ -594,6 +594,10 @@ static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
{
u64 pmcr, val;
/* No PMU available, PMCR_EL0 may UNDEF... */
if (!kvm_arm_support_pmu_v3())
return;
pmcr = read_sysreg(pmcr_el0);
/*
* Writable bits of PMCR_EL0 (ARMV8_PMU_PMCR_MASK) are reset to UNKNOWN
@ -919,7 +923,7 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
#define reg_to_encoding(x) \
sys_reg((u32)(x)->Op0, (u32)(x)->Op1, \
(u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2);
(u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2)
/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
#define DBG_BCR_BVR_WCR_WVR_EL1(n) \

7
arch/arm64/kvm/va_layout.c
View File

@ -34,17 +34,16 @@ static u64 __early_kern_hyp_va(u64 addr)
}
/*
* Store a hyp VA <-> PA offset into a hyp-owned variable.
* Store a hyp VA <-> PA offset into a EL2-owned variable.
*/
static void init_hyp_physvirt_offset(void)
{
extern s64 kvm_nvhe_sym(hyp_physvirt_offset);
u64 kern_va, hyp_va;
/* Compute the offset from the hyp VA and PA of a random symbol. */
kern_va = (u64)kvm_ksym_ref(__hyp_text_start);
kern_va = (u64)lm_alias(__hyp_text_start);
hyp_va = __early_kern_hyp_va(kern_va);
CHOOSE_NVHE_SYM(hyp_physvirt_offset) = (s64)__pa(kern_va) - (s64)hyp_va;
hyp_physvirt_offset = (s64)__pa(kern_va) - (s64)hyp_va;
}
/*

11
arch/arm64/kvm/vgic/vgic-init.c
View File

@ -419,7 +419,8 @@ int vgic_lazy_init(struct kvm *kvm)
* Map the MMIO regions depending on the VGIC model exposed to the guest
* called on the first VCPU run.
* Also map the virtual CPU interface into the VM.
* v2/v3 derivatives call vgic_init if not already done.
* v2 calls vgic_init() if not already done.
* v3 and derivatives return an error if the VGIC is not initialized.
* vgic_ready() returns true if this function has succeeded.
* @kvm: kvm struct pointer
*/
@ -428,7 +429,13 @@ int kvm_vgic_map_resources(struct kvm *kvm)
struct vgic_dist *dist = &kvm->arch.vgic;
int ret = 0;
if (likely(vgic_ready(kvm)))
return 0;
mutex_lock(&kvm->lock);
if (vgic_ready(kvm))
goto out;
if (!irqchip_in_kernel(kvm))
goto out;
@ -439,6 +446,8 @@ int kvm_vgic_map_resources(struct kvm *kvm)
if (ret)
__kvm_vgic_destroy(kvm);
else
dist->ready = true;
out:
mutex_unlock(&kvm->lock);

20
arch/arm64/kvm/vgic/vgic-v2.c
View File

@ -306,20 +306,15 @@ int vgic_v2_map_resources(struct kvm *kvm)
struct vgic_dist *dist = &kvm->arch.vgic;
int ret = 0;
if (vgic_ready(kvm))
goto out;
if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base) ||
IS_VGIC_ADDR_UNDEF(dist->vgic_cpu_base)) {
kvm_err("Need to set vgic cpu and dist addresses first\n");
ret = -ENXIO;
goto out;
return -ENXIO;
}
if (!vgic_v2_check_base(dist->vgic_dist_base, dist->vgic_cpu_base)) {
kvm_err("VGIC CPU and dist frames overlap\n");
ret = -EINVAL;
goto out;
return -EINVAL;
}
/*
@ -329,13 +324,13 @@ int vgic_v2_map_resources(struct kvm *kvm)
ret = vgic_init(kvm);
if (ret) {
kvm_err("Unable to initialize VGIC dynamic data structures\n");
goto out;
return ret;
}
ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V2);
if (ret) {
kvm_err("Unable to register VGIC MMIO regions\n");
goto out;
return ret;
}
if (!static_branch_unlikely(&vgic_v2_cpuif_trap)) {
@ -344,14 +339,11 @@ int vgic_v2_map_resources(struct kvm *kvm)
KVM_VGIC_V2_CPU_SIZE, true);
if (ret) {
kvm_err("Unable to remap VGIC CPU to VCPU\n");
goto out;
return ret;
}
}
dist->ready = true;
out:
return ret;
return 0;
}
DEFINE_STATIC_KEY_FALSE(vgic_v2_cpuif_trap);

21
arch/arm64/kvm/vgic/vgic-v3.c
View File

@ -500,29 +500,23 @@ int vgic_v3_map_resources(struct kvm *kvm)
int ret = 0;
int c;
if (vgic_ready(kvm))
goto out;
kvm_for_each_vcpu(c, vcpu, kvm) {
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
if (IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr)) {
kvm_debug("vcpu %d redistributor base not set\n", c);
ret = -ENXIO;
goto out;
return -ENXIO;
}
}
if (IS_VGIC_ADDR_UNDEF(dist->vgic_dist_base)) {
kvm_err("Need to set vgic distributor addresses first\n");
ret = -ENXIO;
goto out;
return -ENXIO;
}
if (!vgic_v3_check_base(kvm)) {
kvm_err("VGIC redist and dist frames overlap\n");
ret = -EINVAL;
goto out;
return -EINVAL;
}
/*
@ -530,22 +524,19 @@ int vgic_v3_map_resources(struct kvm *kvm)
* the VGIC before we need to use it.
*/
if (!vgic_initialized(kvm)) {
ret = -EBUSY;
goto out;
return -EBUSY;
}
ret = vgic_register_dist_iodev(kvm, dist->vgic_dist_base, VGIC_V3);
if (ret) {
kvm_err("Unable to register VGICv3 dist MMIO regions\n");
goto out;
return ret;
}
if (kvm_vgic_global_state.has_gicv4_1)
vgic_v4_configure_vsgis(kvm);
dist->ready = true;
out:
return ret;
return 0;
}
DEFINE_STATIC_KEY_FALSE(vgic_v3_cpuif_trap);

2
include/kvm/arm_pmu.h
View File

@ -13,7 +13,7 @@
#define ARMV8_PMU_CYCLE_IDX (ARMV8_PMU_MAX_COUNTERS - 1)
#define ARMV8_PMU_MAX_COUNTER_PAIRS ((ARMV8_PMU_MAX_COUNTERS + 1) >> 1)
#ifdef CONFIG_KVM_ARM_PMU
#ifdef CONFIG_HW_PERF_EVENTS
struct kvm_pmc {
u8 idx; /* index into the pmu->pmc array */