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Tue, 3 Nov 2026 17:35:56 -0500 (EST) Date: Tue, 3 Nov 2026 15:35:53 -0700 From: Alex Williamson To: David Matlack Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org, Abhishek Sahu , Raghavendra Rao Ananta , Shuah Khan , alex@shazbot.org Subject: Re: [PATCH 5/5] vfio: selftests: Add test for device power state transitions Message-ID: <20261103153553.6caa7d7d@shazbot.org> In-Reply-To: <20261029203324.1637772-6-dmatlack@google.com> References: <20261029203324.1637772-1-dmatlack@google.com> <20261029203324.1637772-6-dmatlack@google.com> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-pc-linux-gnu) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 29 Oct 2026 20:33:24 +0000 David Matlack wrote: > +/* > + * Put the device into D3hot via config space and then close it. VFIO must > + * return the device to D0 when it is closed. > + */ But we're only testing that it's re-opened into D0, there are multiple ways that could have happened. It's pretty common that a guest shutdown might put devices into a low power state and it's brought back to D0 on close, on reset, on the next open, or even on the reset in open. So I don't think we're testing what we claim to test here. I'm not sure this specific D0 transition is observable, even if we were to resort to pci-sysfs. Thanks, Alex > +TEST_F(vfio_pci_power_state_test, close_in_d3hot) > +{ > + power_state_set(self->device, self->pm_cap, D3HOT); > + ASSERT_EQ(power_state_get(self->device, self->pm_cap), D3HOT); > + > + vfio_pci_device_cleanup(self->device); > + > + self->device = vfio_pci_device_init(device_bdf, self->iommu); > + ASSERT_EQ(power_state_get(self->device, self->pm_cap), D0); > +}