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[209.85.208.173]) by smtp.gmail.com with ESMTPSA id n2sm2464752ljj.1.2020.02.21.16.47.38 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 21 Feb 2020 16:47:38 -0800 (PST) Received: by mail-lj1-f173.google.com with SMTP id w1so4055729ljh.5 for ; Fri, 21 Feb 2020 16:47:38 -0800 (PST) X-Received: by 2002:a2e:1459:: with SMTP id 25mr24246491lju.189.1582332458302; Fri, 21 Feb 2020 16:47:38 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Gurchetan Singh Date: Fri, 21 Feb 2020 16:47:27 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [Bug] virtio-gpu broken with qemu/kvm on arm64 on kernel 5.5+ To: Guillaume Gardet X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , "dri-devel@lists.freedesktop.org" , Gerd Hoffmann , Catalin Marinas , nd Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, Feb 21, 2020 at 10:41 AM Chia-I Wu wrote: > > On Fri, Feb 21, 2020 at 2:06 AM Guillaume Gardet > wrote: > > > > Hi, > > > > > -----Original Message----- > > > From: Chia-I Wu > > > Sent: 20 February 2020 19:41 > > > To: Guillaume Gardet > > > Cc: dri-devel@lists.freedesktop.org; Gerd Hoffmann ; > > > Daniel Vetter ; Catalin Marinas > > > ; nd > > > Subject: Re: [Bug] virtio-gpu broken with qemu/kvm on arm64 on kernel 5.5+ > > > > > > On Thu, Feb 20, 2020 at 4:44 AM Guillaume Gardet > > > wrote: > > > > > > > > Hi, > > > > > > > > With (guest) kernel 5.5+ with qemu/kvm on arm64, I get lots of display > > > corruptions leading to this kind of screen: > > > > https://openqa.opensuse.org/tests/1174521#step/yast2_i/24 > > > Looking at the screenshot, it seems cacheline-related? > > > > It could be. > > > > > > > > There was a change of memory type > > > > > > https://lists.freedesktop.org/archives/dri-devel/2019-August/233456.html > > > > > > While the guest memory type is ignored on Intel, it is honored on ARM. > > > This attempt to fix it > > > > > > https://lists.freedesktop.org/archives/dri-devel/2019-December/248271.html > > > > > > does not seem to land. > > > > I applied this patch on top of 5.5.4, but it does not fix the problem. > > Maybe more similar changes are required? > The patch looks legit. Maybe the memory type is not the root cause? Perhaps try the entire series? https://patchwork.kernel.org/cover/11300619/ _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel