linux-kernel - [PATCH 2/5] selftests: KVM/x86: Fix vcpu_{save,load}_state() by adding APIC state into kvm_x86

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Message-Id: <20220802230718.1891356-3-mizhang@google.com>
Date:   Tue,  2 Aug 2022 23:07:15 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Upton <oupton@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>
Subject: [PATCH 2/5] selftests: KVM/x86: Fix vcpu_{save,load}_state() by
 adding APIC state into kvm_x86_state

Fix vcpu_{save,load}_state() by adding APIC state into kvm_x86_state and
properly save/restore it in vcpu_{save,load}_state(). When vcpu resets,
APIC state become software disabled in kernel and thus the corresponding
vCPU is not able to receive posted interrupts [1].  So, add APIC
save/restore in userspace in selftest library code.

[1] commit 97222cc83163 ("KVM: Emulate local APIC in kernel").

Cc: Jim Mattson <jmattson@...gle.com>

Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 tools/testing/selftests/kvm/include/kvm_util_base.h    | 10 ++++++++++
 tools/testing/selftests/kvm/include/x86_64/processor.h |  1 +
 tools/testing/selftests/kvm/lib/x86_64/processor.c     |  2 ++
 3 files changed, 13 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 24fde97f6121..ac883b8eab57 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -457,6 +457,16 @@ static inline void vcpu_fpu_set(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 	vcpu_ioctl(vcpu, KVM_SET_FPU, fpu);
 }
 
+static inline void vcpu_apic_get(struct kvm_vcpu *vcpu, struct kvm_lapic_state *apic)
+{
+	vcpu_ioctl(vcpu, KVM_GET_LAPIC, apic);
+}
+
+static inline void vcpu_apic_set(struct kvm_vcpu *vcpu, struct kvm_lapic_state *apic)
+{
+	vcpu_ioctl(vcpu, KVM_SET_LAPIC, apic);
+}
+
 static inline int __vcpu_get_reg(struct kvm_vcpu *vcpu, uint64_t id, void *addr)
 {
 	struct kvm_one_reg reg = { .id = id, .addr = (uint64_t)addr };
diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 45edf45821d0..bf5f874709a4 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -225,6 +225,7 @@ struct kvm_x86_state {
 		struct kvm_nested_state nested;
 		char nested_[16384];
 	};
+	struct kvm_lapic_state apic;
 	struct kvm_msrs msrs;
 };
 
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index f35626df1dea..d18da71654b6 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -980,6 +980,7 @@ struct kvm_x86_state *vcpu_save_state(struct kvm_vcpu *vcpu)
 	vcpu_msrs_get(vcpu, &state->msrs);
 
 	vcpu_debugregs_get(vcpu, &state->debugregs);
+	vcpu_apic_get(vcpu, &state->apic);
 
 	return state;
 }
@@ -997,6 +998,7 @@ void vcpu_load_state(struct kvm_vcpu *vcpu, struct kvm_x86_state *state)
 	vcpu_mp_state_set(vcpu, &state->mp_state);
 	vcpu_debugregs_set(vcpu, &state->debugregs);
 	vcpu_regs_set(vcpu, &state->regs);
+	vcpu_apic_set(vcpu, &state->apic);
 
 	if (state->nested.size)
 		vcpu_nested_state_set(vcpu, &state->nested);
-- 
2.37.1.455.g008518b4e5-goog