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[2001:4c4e:24d8:e500:ac9d:aee3:e0cd:fa47]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493cce040b4sm92491775e9.10.2026.07.03.11.50.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Jul 2026 11:50:11 -0700 (PDT) From: Timur =?UTF-8?B?S3Jpc3TDs2Y=?= To: "Koenig, Christian" , "amd-gfx@lists.freedesktop.org" , "Deucher, Alexander" , Natalie Vock , "Shetaia, Amir" , Marek =?UTF-8?B?T2zFocOhaw==?= , "Limonciello, Mario" , Tvrtko Ursulin , "Kuehling, Felix" , "Lazar, Lijo" , "He, Siwei" , "Yang, Philip" , "Joshi, Mukul" Subject: Re: [PATCH 11/14] drm/amdgpu/ih6.0: Use MMIO ACK for retry CAM on IH 6.0 Date: Fri, 03 Jul 2026 20:50:09 +0200 Message-ID: <3014087.Ex9A2HvPv6@timur-max> In-Reply-To: References: <20260701161721.85681-1-timur.kristof@gmail.com> <4547ddd3-974a-4c9c-8fec-939dc132f7d0@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" On 2026. j=C3=BAlius 3., p=C3=A9ntek 20:11:59 k=C3=B6z=C3=A9p-eur=C3=B3pai = ny=C3=A1ri id=C5=91 Joshi, Mukul=20 wrote: > > I still haven't found any explanation why we use a doorbell for the CAM= in > > the first > place? Lijo, Alex, Felix does anybody know that? > > >=20 > If I remember correctly, we weren't sure if the IH_RETRY_CAM_ACK register > would be available under > virtualization. And we were sure doorbells would > work for both bare-metal and virtualization.=20 Hi Mukul, Can you clarify that please? How are retry faults supposed to work under virtualization? Is the interrup= t=20 processed by the guest or the host? Why is the IH_RETRY_CAM_ACK register no= t=20 available under virtualization? Thanks & best regards, Timur