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[35.185.200.132]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7b0cc179f14sm56176b3a.45.2025.11.06.09.10.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Nov 2025 09:10:57 -0800 (PST) Date: Thu, 6 Nov 2025 17:10:53 +0000 From: David Matlack To: Raghavendra Rao Ananta Cc: Alex Williamson , Alex Williamson , Josh Hilke , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/4] vfio: selftests: Add support for passing vf_token in device init Message-ID: References: <20251104003536.3601931-1-rananta@google.com> <20251104003536.3601931-2-rananta@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On 2025-11-06 10:06 PM, Raghavendra Rao Ananta wrote: > On Thu, Nov 6, 2025 at 5:44 AM David Matlack wrote: > > > > On 2025-11-04 12:35 AM, Raghavendra Rao Ananta wrote: > > > > > diff --git a/tools/testing/selftests/vfio/lib/libvfio.mk b/tools/testing/selftests/vfio/lib/libvfio.mk > > > index 5d11c3a89a28e..2dc85c41ffb4b 100644 > > > --- a/tools/testing/selftests/vfio/lib/libvfio.mk > > > +++ b/tools/testing/selftests/vfio/lib/libvfio.mk > > > @@ -18,7 +18,9 @@ $(shell mkdir -p $(LIBVFIO_O_DIRS)) > > > > > > CFLAGS += -I$(VFIO_DIR)/lib/include > > > > > > +LDLIBS += -luuid > > > > I wonder if we really need this dependency. VFIO and IOMMUFD just expect > > a 16 byte character array. That is easy enough to represent. The other > > part we use is uuid_parse(), but I don't know if selftests need to do > > that validation. We can let VFIO and IOMMUFD validate the UUID as they > > see fit and return an error if they aren't happy with it. i.e. We do not > > need to duplicate validation in the test. > > Unfortunately, VFIO interface accepts UUID in multiple formats. For > VFIO_DEVICE_FEATURE and VFIO_DEVICE_BIND_IOMMUFD it accepts a > 'u8[16]', but for VFIO_GROUP_GET_DEVICE_FD, we must present it as a > string. Is there an issue with the inclusion of an external library (I > think I've seen others in tools/ use it). Ack. In that case, depending on libuuid SGTM. I mistakenly thought VFIO always took the UUID as a string and uuid_parse() was just being used to sanity check the format. Thanks for clarifying.