[PATCH v5 11/18] kvm: x86: hyperv: Use APICv update request interface

Suravee Suthikulpanit
2019-11-14T20:16:42Z

Since disabling APICv has to be done for all vcpus on AMD-based
system, adopt the newly introduced kvm_request_apicv_update()
interface, and introduce a new APICV_INHIBIT_REASON_HYPERV.

Also, remove the kvm_vcpu_deactivate_apicv() since no longer used.

Cc: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/hyperv.c | 5 +++--
arch/x86/kvm/svm.c | 3 ++-
arch/x86/kvm/vmx/vmx.c | 3 ++-
arch/x86/kvm/x86.c | 13 -------------
5 files changed, 8 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c685643..5d1e4a9 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -850,6 +850,7 @@ enum kvm_irqchip_mode {
};

#define APICV_INHIBIT_REASON_DISABLE 0
+#define APICV_INHIBIT_REASON_HYPERV 1

struct kvm_arch {
unsigned long n_used_mmu_pages;
@@ -1447,7 +1448,6 @@ gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception);

-void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu);
bool kvm_apicv_activated(struct kvm *kvm);
void kvm_apicv_init(struct kvm *kvm, bool enable);
void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 23ff655..3ecfb32 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -775,9 +775,10 @@ int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)

/*
* Hyper-V SynIC auto EOI SINT's are
- * not compatible with APICV, so deactivate APICV
+ * not compatible with APICV, so request
+ * to deactivate APICV permanently.
*/
- kvm_vcpu_deactivate_apicv(vcpu);
+ kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_HYPERV);
synic->active = true;
synic->dont_zero_synic_pages = dont_zero_synic_pages;
return 0;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a1890bb..5e80b7e 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -7243,7 +7243,8 @@ static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)

static bool svm_check_apicv_inhibit_reasons(ulong bit)
{
- ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE);
+ ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
+ BIT(APICV_INHIBIT_REASON_HYPERV);

return supported & BIT(bit);
}
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8f51569..8aa3895 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7734,7 +7734,8 @@ static __exit void hardware_unsetup(void)

static bool vmx_check_apicv_inhibit_reasons(ulong bit)
{
- ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE);
+ ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
+ BIT(APICV_INHIBIT_REASON_HYPERV);

return supported & BIT(bit);
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cbc7884..5e8cfaf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7317,19 +7317,6 @@ static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
}

-void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)
-{
- if (!lapic_in_kernel(vcpu)) {
- WARN_ON_ONCE(vcpu->arch.apicv_active);
- return;
- }
- if (!vcpu->arch.apicv_active)
- return;
-
- vcpu->arch.apicv_active = false;
- kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
-}
-
bool kvm_apicv_activated(struct kvm *kvm)
{
return (READ_ONCE(kvm->arch.apicv_inhibit_reasons) == 0);
--
1.8.3.1