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Subject[PART1 V5 10/13] KVM: x86: Introducing kvm_x86_ops.apicv_post_state_restore
Date
Adding kvm_x86_ops hooks to allow APICv to do post state restore.
This is required to support VM save and restore feature.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/lapic.c | 2 ++
arch/x86/kvm/svm.c | 10 ++++++++++
3 files changed, 13 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index a87e825..753359e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1004,6 +1004,7 @@ struct kvm_x86_ops {

int (*update_pi_irte)(struct kvm *kvm, unsigned int host_irq,
uint32_t guest_irq, bool set);
+ void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
};

struct kvm_arch_async_pf {
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 34c28c0..539675c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1961,6 +1961,8 @@ void kvm_apic_post_state_restore(struct kvm_vcpu *vcpu,
1 : count_vectors(apic->regs + APIC_ISR);
apic->highest_isr_cache = -1;
if (vcpu->arch.apicv_active) {
+ if (kvm_x86_ops->apicv_post_state_restore)
+ kvm_x86_ops->apicv_post_state_restore(vcpu);
kvm_x86_ops->hwapic_irr_update(vcpu,
apic_find_highest_irr(apic));
kvm_x86_ops->hwapic_isr_update(vcpu->kvm,
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 90b34fa..6c1d558 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -4833,6 +4833,15 @@ static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
{
}

+static inline void avic_post_state_restore(struct kvm_vcpu *vcpu)
+{
+ if (avic_handle_apic_id_update(vcpu) != 0)
+ return;
+ if (avic_handle_dfr_update(vcpu) != 0)
+ return;
+ avic_handle_ldr_update(vcpu);
+}
+
static struct kvm_x86_ops svm_x86_ops = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
@@ -4913,6 +4922,7 @@ static struct kvm_x86_ops svm_x86_ops = {
.sync_pir_to_irr = svm_sync_pir_to_irr,
.hwapic_irr_update = svm_hwapic_irr_update,
.hwapic_isr_update = svm_hwapic_isr_update,
+ .apicv_post_state_restore = avic_post_state_restore,

.set_tss_addr = svm_set_tss_addr,
.get_tdp_level = get_npt_level,
--
1.9.1
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