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arm/arm64: KVM: Turn kvm_psci_version into a static inline

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We're about to need kvm_psci_version in HYP too. So let's turn it
into a static inline, and pass the kvm structure as a second
parameter (so that HYP can do a kern_hyp_va on it).

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier 2018-02-06 17:56:13 +00:00 committed by Catalin Marinas
parent 09e6be12ef
commit a4097b3511
3 changed files with 33 additions and 18 deletions
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14
arch/arm64/kvm/hyp/switch.c
View File

@ -19,6 +19,8 @@
#include <linux/jump_label.h>
#include <uapi/linux/psci.h>
#include <kvm/arm_psci.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
@ -350,15 +352,17 @@ again:
if (exit_code == ARM_EXCEPTION_TRAP &&
(kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC64 ||
kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC32) &&
vcpu_get_reg(vcpu, 0) == PSCI_0_2_FN_PSCI_VERSION) {
u64 val = PSCI_RET_NOT_SUPPORTED;
if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
val = 2;
kvm_vcpu_trap_get_class(vcpu) == ESR_ELx_EC_HVC32)) {
u32 val = vcpu_get_reg(vcpu, 0);
if (val == PSCI_0_2_FN_PSCI_VERSION) {
val = kvm_psci_version(vcpu, kern_hyp_va(vcpu->kvm));
if (unlikely(val == KVM_ARM_PSCI_0_1))
val = PSCI_RET_NOT_SUPPORTED;
vcpu_set_reg(vcpu, 0, val);
goto again;
}
}
if (static_branch_unlikely(&vgic_v2_cpuif_trap) &&
exit_code == ARM_EXCEPTION_TRAP) {

21
include/kvm/arm_psci.h
View File

@ -18,6 +18,7 @@
#ifndef __KVM_ARM_PSCI_H__
#define __KVM_ARM_PSCI_H__
#include <linux/kvm_host.h>
#include <uapi/linux/psci.h>
#define KVM_ARM_PSCI_0_1 PSCI_VERSION(0, 1)
@ -26,7 +27,25 @@
#define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_0
int kvm_psci_version(struct kvm_vcpu *vcpu);
/*
* We need the KVM pointer independently from the vcpu as we can call
* this from HYP, and need to apply kern_hyp_va on it...
*/
static inline int kvm_psci_version(struct kvm_vcpu *vcpu, struct kvm *kvm)
{
/*
* Our PSCI implementation stays the same across versions from
* v0.2 onward, only adding the few mandatory functions (such
* as FEATURES with 1.0) that are required by newer
* revisions. It is thus safe to return the latest.
*/
if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
return KVM_ARM_PSCI_LATEST;
return KVM_ARM_PSCI_0_1;
}
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu);
#endif /* __KVM_ARM_PSCI_H__ */

12
virt/kvm/arm/psci.c
View File

@ -123,7 +123,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
if (!vcpu)
return PSCI_RET_INVALID_PARAMS;
if (!vcpu->arch.power_off) {
if (kvm_psci_version(source_vcpu) != KVM_ARM_PSCI_0_1)
if (kvm_psci_version(source_vcpu, kvm) != KVM_ARM_PSCI_0_1)
return PSCI_RET_ALREADY_ON;
else
return PSCI_RET_INVALID_PARAMS;
@ -232,14 +232,6 @@ static void kvm_psci_system_reset(struct kvm_vcpu *vcpu)
kvm_prepare_system_event(vcpu, KVM_SYSTEM_EVENT_RESET);
}
int kvm_psci_version(struct kvm_vcpu *vcpu)
{
if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features))
return KVM_ARM_PSCI_LATEST;
return KVM_ARM_PSCI_0_1;
}
static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
@ -397,7 +389,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
*/
static int kvm_psci_call(struct kvm_vcpu *vcpu)
{
switch (kvm_psci_version(vcpu)) {
switch (kvm_psci_version(vcpu, vcpu->kvm)) {
case KVM_ARM_PSCI_1_0:
return kvm_psci_1_0_call(vcpu);
case KVM_ARM_PSCI_0_2: