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arm64: KVM: PSCI implementation

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Wire the PSCI backend into the exit handling code.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2012-12-12 18:52:05 +00:00
parent 003300de6c
commit dcd2e40c1e
4 changed files with 47 additions and 10 deletions
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2
arch/arm64/include/asm/kvm_host.h
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@ -34,7 +34,7 @@
#include <kvm/arm_vgic.h>
#include <kvm/arm_arch_timer.h>
#define KVM_VCPU_MAX_FEATURES 0
#define KVM_VCPU_MAX_FEATURES 1
/* We don't currently support large pages. */
#define KVM_HPAGE_GFN_SHIFT(x) 0

23
arch/arm64/include/asm/kvm_psci.h Normal file
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@ -0,0 +1,23 @@
/*
* Copyright (C) 2012,2013 - ARM Ltd
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ARM64_KVM_PSCI_H__
#define __ARM64_KVM_PSCI_H__
bool kvm_psci_call(struct kvm_vcpu *vcpu);
#endif /* __ARM64_KVM_PSCI_H__ */

16
arch/arm64/include/uapi/asm/kvm.h
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@ -69,6 +69,8 @@ struct kvm_regs {
#define KVM_VGIC_V2_DIST_SIZE 0x1000
#define KVM_VGIC_V2_CPU_SIZE 0x2000
#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
struct kvm_vcpu_init {
__u32 target;
__u32 features[7];
@ -141,6 +143,20 @@ struct kvm_arch_memory_slot {
/* Highest supported SPI, from VGIC_NR_IRQS */
#define KVM_ARM_IRQ_GIC_MAX 127
/* PSCI interface */
#define KVM_PSCI_FN_BASE 0x95c1ba5e
#define KVM_PSCI_FN(n) (KVM_PSCI_FN_BASE + (n))
#define KVM_PSCI_FN_CPU_SUSPEND KVM_PSCI_FN(0)
#define KVM_PSCI_FN_CPU_OFF KVM_PSCI_FN(1)
#define KVM_PSCI_FN_CPU_ON KVM_PSCI_FN(2)
#define KVM_PSCI_FN_MIGRATE KVM_PSCI_FN(3)
#define KVM_PSCI_RET_SUCCESS 0
#define KVM_PSCI_RET_NI ((unsigned long)-1)
#define KVM_PSCI_RET_INVAL ((unsigned long)-2)
#define KVM_PSCI_RET_DENIED ((unsigned long)-3)
#endif
#endif /* __ARM_KVM_H__ */

16
arch/arm64/kvm/handle_exit.c
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@ -24,26 +24,24 @@
#include <asm/kvm_emulate.h>
#include <asm/kvm_coproc.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_psci.h>
typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
/*
* Guest called HVC instruction:
* Let it know we don't want that by injecting an undefined exception.
*/
kvm_debug("hvc: %x (at %08lx)", kvm_vcpu_get_hsr(vcpu) & ((1 << 16) - 1),
*vcpu_pc(vcpu));
kvm_debug(" HSR: %8x", kvm_vcpu_get_hsr(vcpu));
if (kvm_psci_call(vcpu))
return 1;
kvm_inject_undefined(vcpu);
return 1;
}
static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
/* We don't support SMC; don't do that. */
kvm_debug("smc: at %08lx", *vcpu_pc(vcpu));
if (kvm_psci_call(vcpu))
return 1;
kvm_inject_undefined(vcpu);
return 1;
}