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[195.150.55.226]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-688baf1e20asm1806980a12.15.2026.05.23.04.20.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 May 2026 04:20:48 -0700 (PDT) From: Piotr Zarycki To: seanjc@google.com, pbonzini@redhat.com Cc: vkuznets@redhat.com, shuah@kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Piotr Zarycki Subject: [PATCH] KVM: selftests: hyperv_features: test write of 1 to HV_X64_MSR_RESET Date: Sat, 23 May 2026 13:18:57 +0200 Message-ID: <20260523111857.195396-1-piotr.zarycki@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- .../selftests/kvm/x86/hyperv_features.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/kvm/x86/hyperv_features.c b/tools/test= ing/selftests/kvm/x86/hyperv_features.c index 7347f1fe5157..7c8afe43eef2 100644 --- a/tools/testing/selftests/kvm/x86/hyperv_features.c +++ b/tools/testing/selftests/kvm/x86/hyperv_features.c @@ -26,6 +26,7 @@ struct msr_data { bool fault_expected; bool write; u64 write_val; + bool reset_expected; }; =20 struct hcall_data { @@ -267,14 +268,9 @@ static void guest_test_msrs_access(void) case 16: msr->idx =3D HV_X64_MSR_RESET; msr->write =3D 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 =3D 0; + msr->write_val =3D 1; msr->fault_expected =3D false; + msr->reset_expected =3D true; break; =20 case 17: @@ -497,6 +493,15 @@ static void guest_test_msrs_access(void) msr->idx, msr->write ? "write" : "read"); =20 vcpu_run(vcpu); + + if (msr->reset_expected) { + TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SYSTEM_EVENT); + TEST_ASSERT(vcpu->run->system_event.type =3D=3D 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); =20 switch (get_ucall(vcpu, &uc)) { --=20 2.54.0