From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Sean Christopherson <seanjc@google.com>
Subject: [PATCH 08/11] KVM: selftests: Run the nested x2APIC with and without APICv being inhibited in L2
Date: Sat, 26 Sep 2026 01:32:50 -0400 [thread overview]
Message-ID: <20260926053253.195597-9-pbonzini@redhat.com> (raw)
In-Reply-To: <20260926053253.195597-1-pbonzini@redhat.com>
From: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260813223610.2043560-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
.../selftests/kvm/x86/nested_x2apic_test.c | 25 ++++++++++++++++---
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/kvm/x86/nested_x2apic_test.c b/tools/testing/selftests/kvm/x86/nested_x2apic_test.c
index e77b4c347272..a1072bf499ee 100644
--- a/tools/testing/selftests/kvm/x86/nested_x2apic_test.c
+++ b/tools/testing/selftests/kvm/x86/nested_x2apic_test.c
@@ -15,6 +15,7 @@
#define POSTED_INTR_WAKEUP_VECTOR 0xf1
#define POSTED_INTR_NESTED_VECTOR 0xf0
+static bool inhibit_apicv;
static volatile unsigned int nr_irqs;
static void guest_irq_handler(struct ex_regs *regs)
@@ -25,7 +26,8 @@ static void guest_irq_handler(struct ex_regs *regs)
static void l2_guest_code(void)
{
- wrmsr(MSR_IA32_APICBASE, rdmsr(MSR_IA32_APICBASE) & GENMASK_ULL(11, 0));
+ if (inhibit_apicv)
+ wrmsr(MSR_IA32_APICBASE, rdmsr(MSR_IA32_APICBASE) & GENMASK_ULL(11, 0));
asm volatile("cpuid" ::: "eax", "ebx", "ecx", "edx");
}
@@ -78,20 +80,20 @@ static void l1_guest_code(void *test_data)
GUEST_DONE();
}
-int main(int argc, char *argv[])
+static void __test_x2apic_intercepts(void)
{
gva_t nested_test_data_gva;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct ucall uc;
- TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM) || kvm_cpu_has(X86_FEATURE_VMX));
-
vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
vm_install_exception_handler(vm, POSTED_INTR_VECTOR, guest_irq_handler);
vm_install_exception_handler(vm, POSTED_INTR_WAKEUP_VECTOR, guest_irq_handler);
vm_install_exception_handler(vm, POSTED_INTR_NESTED_VECTOR, guest_irq_handler);
+ sync_global_to_guest(vm, inhibit_apicv);
+
if (kvm_cpu_has(X86_FEATURE_SVM))
vcpu_alloc_svm(vm, &nested_test_data_gva);
else
@@ -115,3 +117,18 @@ int main(int argc, char *argv[])
kvm_vm_free(vm);
}
+
+#define test_x2apic_intercepts(inhibit_apic_setting) \
+do { \
+ inhibit_apic_setting; \
+ \
+ __test_x2apic_intercepts(); \
+} while (0)
+
+int main(int argc, char *argv[])
+{
+ TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM) || kvm_cpu_has(X86_FEATURE_VMX));
+
+ test_x2apic_intercepts(inhibit_apicv = true);
+ test_x2apic_intercepts(inhibit_apicv = false);
+}
--
2.52.0
next prev parent reply other threads:[~2026-09-26 5:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-26 5:32 [PATCH 00/11] KVM: fix issues with stale control fields Paolo Bonzini
2026-09-26 5:32 ` [PATCH 01/11] KVM: SVM: Preserve TLB control (i.e. pending TLB flush) on failed VMRUN Paolo Bonzini
2026-09-26 5:32 ` [PATCH 02/11] KVM: SVM: Update control fields on #VMEXIT if and only if VMRUN succeeded Paolo Bonzini
2026-09-26 5:32 ` [PATCH 03/11] KVM: SVM: Don't mark ASID fields as dirty when setting control.tlb_ctl Paolo Bonzini
2026-09-26 5:32 ` [PATCH 04/11] KVM: SVM: Sync guest's PERF_CNTR_GLOBAL_CTL from h/w only on successful VMRUN Paolo Bonzini
2026-09-26 5:32 ` [PATCH 05/11] KVM: SVM: Use the active VMCB's MSR bitmap when checking if MSR is intercepted Paolo Bonzini
2026-09-26 5:32 ` [PATCH 06/11] KVM: nVMX: Force MSR bitmap refresh if runtime eVMCS controls are modified Paolo Bonzini
2026-09-26 5:32 ` [PATCH 07/11] KVM: selftests: Add x2APIC MSR test for inhibiting APICv while nested Paolo Bonzini
2026-09-26 5:32 ` Paolo Bonzini [this message]
2026-09-26 5:32 ` [PATCH 09/11] KVM: selftests: Verify that L0's TPR doesn't get clobbered Paolo Bonzini
2026-09-26 5:32 ` [PATCH 10/11] KVM: selftests: Extend nested x2APIC test to validate disabling x2APIC virt Paolo Bonzini
2026-09-26 5:32 ` [PATCH 11/11] KVM: selftests: Extend nested x2APIC test to validate using eVMCS for vmcs12 Paolo Bonzini
2026-09-26 6:11 ` [PATCH 00/11] KVM: fix issues with stale control fields Paolo Bonzini
2026-09-28 17:01 ` Sean Christopherson
2026-09-26 6:12 ` Paolo Bonzini
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