niansa-misc/linux
1
0
Fork 0
mirror of synced 2025-03-06 20:59:54 +01:00
Code Issues Projects Releases Packages Wiki Activity

KVM: selftests: Add CPUID tests for Hyper-V features that need in-kernel APIC

Browse source 
Add testcases to x86's Hyper-V CPUID test to verify that KVM advertises
support for features that require an in-kernel local APIC appropriately,
i.e. that KVM hides support from the vCPU-scoped ioctl if the VM doesn't
have an in-kernel local APIC.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20250118003454.2619573-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2025-01-17 16:34:54 -08:00
parent cd5a0c2f0f
commit e36454461c
1 changed files with 14 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
tools/testing/selftests/kvm/x86/hyperv_cpuid.c
View file

@ -43,6 +43,7 @@ static bool smt_possible(void)
static void test_hv_cpuid(struct kvm_vcpu *vcpu, bool evmcs_expected)
{
const bool has_irqchip = !vcpu || vcpu->vm->has_irqchip;
const struct kvm_cpuid2 *hv_cpuid_entries;
int i;
int nent_expected = 10;
@ -85,12 +86,19 @@ static void test_hv_cpuid(struct kvm_vcpu *vcpu, bool evmcs_expected)
entry->eax, evmcs_expected
);
break;
case 0x40000003:
TEST_ASSERT(has_irqchip || !(entry->edx & BIT(19)),
"\"Direct\" Synthetic Timers should require in-kernel APIC");
break;
case 0x40000004:
test_val = entry->eax & (1UL << 18);
TEST_ASSERT(!!test_val == !smt_possible(),
"NoNonArchitecturalCoreSharing bit"
" doesn't reflect SMT setting");
TEST_ASSERT(has_irqchip || !(entry->eax & BIT(10)),
"Cluster IPI (i.e. SEND_IPI) should require in-kernel APIC");
break;
case 0x4000000A:
TEST_ASSERT(entry->eax & (1UL << 19),
@ -145,9 +153,14 @@ int main(int argc, char *argv[])
TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_CPUID));
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
/* Test the vCPU ioctl without an in-kernel local APIC. */
vm = vm_create_barebones();
vcpu = __vm_vcpu_add(vm, 0);
test_hv_cpuid(vcpu, false);
kvm_vm_free(vm);
/* Test vCPU ioctl version */
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
test_hv_cpuid_e2big(vm, vcpu);
test_hv_cpuid(vcpu, false);