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Subject[PATCH 5/6] KVM: x86: Add interface for run-time activate/de-activate APIC virtualization
Date
When activate / deactivate AVIC during runtime, all vcpus has to be
operating in the same mode. So, introduce new interface to request
all vCPUs to activate/deactivate APICV.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
arch/x86/include/asm/kvm_host.h | 8 ++++++
arch/x86/kvm/x86.c | 48 +++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1906e205e6a3..31dee26a37f2 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -79,6 +79,10 @@
#define KVM_REQ_HV_STIMER KVM_ARCH_REQ(22)
#define KVM_REQ_LOAD_EOI_EXITMAP KVM_ARCH_REQ(23)
#define KVM_REQ_GET_VMCS12_PAGES KVM_ARCH_REQ(24)
+#define KVM_REQ_APICV_ACTIVATE \
+ KVM_ARCH_REQ_FLAGS(25, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
+#define KVM_REQ_APICV_DEACTIVATE \
+ KVM_ARCH_REQ_FLAGS(26, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)

#define CR0_RESERVED_BITS \
(~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
@@ -1537,6 +1541,10 @@ bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip);

void kvm_make_mclock_inprogress_request(struct kvm *kvm);
void kvm_make_scan_ioapic_request(struct kvm *kvm);
+void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu);
+void kvm_vcpu_activate_apicv(struct kvm_vcpu *vcpu);
+void kvm_make_apicv_activate_request(struct kvm *kvm);
+void kvm_make_apicv_deactivate_request(struct kvm *kvm);

void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 65e4559eef2f..1cd49c394680 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -29,6 +29,7 @@
#include "cpuid.h"
#include "pmu.h"
#include "hyperv.h"
+#include "lapic.h"

#include <linux/clocksource.h>
#include <linux/interrupt.h>
@@ -7054,6 +7055,22 @@ 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_activate_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 = true;
+ kvm_apic_update_apicv(vcpu);
+
+ kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_vcpu_activate_apicv);
+
void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)
{
if (!lapic_in_kernel(vcpu)) {
@@ -7064,8 +7081,11 @@ void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)
return;

vcpu->arch.apicv_active = false;
+ kvm_apic_update_apicv(vcpu);
+
kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
}
+EXPORT_SYMBOL_GPL(kvm_vcpu_deactivate_apicv);

int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
{
@@ -7557,6 +7577,30 @@ void kvm_make_scan_ioapic_request(struct kvm *kvm)
kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
}

+void kvm_make_apicv_activate_request(struct kvm *kvm)
+{
+ int i;
+ struct kvm_vcpu *v;
+
+ kvm_for_each_vcpu(i, v, kvm)
+ kvm_clear_request(KVM_REQ_APICV_DEACTIVATE, v);
+
+ kvm_make_all_cpus_request(kvm, KVM_REQ_APICV_ACTIVATE);
+}
+EXPORT_SYMBOL_GPL(kvm_make_apicv_activate_request);
+
+void kvm_make_apicv_deactivate_request(struct kvm *kvm)
+{
+ int i;
+ struct kvm_vcpu *v;
+
+ kvm_for_each_vcpu(i, v, kvm)
+ kvm_clear_request(KVM_REQ_APICV_ACTIVATE, v);
+
+ kvm_make_all_cpus_request(kvm, KVM_REQ_APICV_DEACTIVATE);
+}
+EXPORT_SYMBOL_GPL(kvm_make_apicv_deactivate_request);
+
static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
{
if (!kvm_apic_present(vcpu))
@@ -7743,6 +7787,10 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
*/
if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu))
kvm_hv_process_stimers(vcpu);
+ if (kvm_check_request(KVM_REQ_APICV_ACTIVATE, vcpu))
+ kvm_vcpu_activate_apicv(vcpu);
+ if (kvm_check_request(KVM_REQ_APICV_DEACTIVATE, vcpu))
+ kvm_vcpu_deactivate_apicv(vcpu);
}

if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
--
2.17.1
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