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KVM: selftests: hyperv_features: test write of 1 to HV_X64_MSR_RESET

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Writing 1 to HV_X64_MSR_RESET triggers a real vCPU reset; the test
was writing 0 because the host loop was not prepared to handle the
resulting KVM_EXIT_SYSTEM_EVENT. Add the missing handling and write
1 to actually exercise the reset path.

Signed-off-by: Piotr Zarycki <piotr.zarycki@gmail.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://patch.msgid.link/20260523111857.195396-1-piotr.zarycki@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Piotr Zarycki 2026-05-23 13:18:57 +02:00 committed by Sean Christopherson
parent 4e0fdd9b0d
commit 5bd0387e3b
1 changed files with 12 additions and 7 deletions
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19
tools/testing/selftests/kvm/x86/hyperv_features.c
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@ -26,6 +26,7 @@ struct msr_data {
bool fault_expected;
bool write;
u64 write_val;
bool reset_expected;
};
struct hcall_data {
@ -267,14 +268,9 @@ static void guest_test_msrs_access(void)
case 16:
msr->idx = HV_X64_MSR_RESET;
msr->write = true;
/*
* TODO: the test only writes '0' to HV_X64_MSR_RESET
* at the moment, writing some other value there will
* trigger real vCPU reset and the code is not prepared
* to handle it yet.
*/
msr->write_val = 0;
msr->write_val = 1;
msr->fault_expected = false;
msr->reset_expected = true;
break;
case 17:
@ -497,6 +493,15 @@ static void guest_test_msrs_access(void)
msr->idx, msr->write ? "write" : "read");
vcpu_run(vcpu);
if (msr->reset_expected) {
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SYSTEM_EVENT);
TEST_ASSERT(vcpu->run->system_event.type == KVM_SYSTEM_EVENT_RESET,
"Expected reset system event, got type %u",
vcpu->run->system_event.type);
goto next_stage;
}
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
switch (get_ucall(vcpu, &uc)) {