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Thu, 10 Apr 2025 05:13:46 +0000 Date: Thu, 10 Apr 2025 13:12:01 +0800 From: Yan Zhao To: Myrsky Lintu CC: Linux regressions mailing list , "Vitaly Kuznetsov" , Sean Christopherson , Paolo Bonzini , , , , Kevin Tian , Yiwei Zhang , Lai Jiangshan , "Paul E. McKenney" , "Josh Triplett" , Gerd Hoffmann Subject: Re: [PATCH 5/5] KVM: VMX: Always honor guest PAT on CPUs that support self-snoop Message-ID: Reply-To: Yan Zhao References: <0f37f8e5-3cfe-4efb-bec9-b0882d85ead2@proton.me> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <0f37f8e5-3cfe-4efb-bec9-b0882d85ead2@proton.me> X-ClientProxiedBy: SG2PR02CA0003.apcprd02.prod.outlook.com (2603:1096:3:17::15) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|SN7PR11MB6945:EE_ X-MS-Office365-Filtering-Correlation-Id: 2745f0fa-8379-43ff-55f4-08dd77ee7863 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?dAgnsDlBbwONV9zHBUnC0AWXHSRI+UTpbmpFd2VbGgoRJ2EYo61mu0ib/6Uu?= =?us-ascii?Q?qrkJ1F/Y4EhTRe6DWzX++GwiLLcUsZJbjs1J729OWq1XmJqyLEYTmcmQVuEq?= =?us-ascii?Q?2T/cRpDb6qpgt6C87k4Z3p88gB/AWm+cQkK3aMFrS7qiV110a67Wf7FqIid8?= =?us-ascii?Q?w3YYXa9oCrwTXtH0oyQq4JeXAD886kcnOJWw001+hPltR4TYan61ZC6oKhId?= =?us-ascii?Q?mOZgr3F6NNV5hSjxBpKnDrEEvRHlr54XWXZWOsGHgpEM+bZm0AtJ2VTYuLo3?= =?us-ascii?Q?S1fJugqLfdAWiEbSS3TrQUo+uxNqTev5d7LbNopDo8IzCoqvG8POIjOmKdWT?= =?us-ascii?Q?LYNaPN9HXnaVW79UP2ls01WUqvYALlhW5GAiOsuJCvrzcMZtr/RN5s30bQ3B?= =?us-ascii?Q?LnsP9aioyoZ6QI0xrGlKzk+JQKgmlwg8i5K6HSSg55sdpBi76Pq1LJILL84W?= =?us-ascii?Q?dNqiLp15WSM/m+e8IbmOJtNLOx7sXiNikmOEdluPp+bOG512UKD72Ks2vvSR?= =?us-ascii?Q?JAYmS1XJwSV3WJVDrlHanChvYHlQAb+bEyGqSZ/5kcOeFdndM224ybhgwrsF?= =?us-ascii?Q?ezW+2uDoA5WD+PKypBPkEO0ZRoP6OFJOpgjOhrA91mqsQUxOCKq2wh/B0wJV?= =?us-ascii?Q?CNOjMSPTRAS286VOB3AYi8FhQcpNKWLqoUIGKPeV3egO7EX/BTQhCWddjB3e?= =?us-ascii?Q?0wZibHhod35+5nybeh8OtYedlbZd0zZ9aZiPqT504z4/SHcevPLuacJK4Zat?= =?us-ascii?Q?ujjcCQ4d2DUdKg7oSQY/9oM8MoacBUfNWBibwyOPRnVqbXkl2QAfLLKNCznK?= =?us-ascii?Q?bd4JDqfjXqHUFI9EaTHYIWKpqSxOtBUeMElVgn/oNjCuztWEUsMS1NvP8OBd?= =?us-ascii?Q?tbHp+J0NlZOSCc9StQhb5YwisTBuO6S3Nq7c+FA9yxgr7Bw+w/PZiRalhTfF?= =?us-ascii?Q?P9d/Za/BA7RHTDNfAZSxqchO5Yjrw81RaOHKldaYL4i1/THaCIcxZUGOVdb1?= =?us-ascii?Q?z4p079AhbAvlC3n3gGIyfE2oSnbGQV7aLfvdcWGfvayN2hxhxjRJT6Ky0Fku?= =?us-ascii?Q?oRDJzO30iI9oir7HnDrBYFpQhZdNMqPImHS3j1gmXYE1Z8GtQYT9XLVTD08s?= =?us-ascii?Q?HdQa1SMyLf9qt4kGs6qi5g6I8JdTTdOvd4CALIh1tuoxdHuSGnUXbEllD2nx?= =?us-ascii?Q?u6AClha+5uX5EqvQqjaigLs5pwI7l4Vm/Hal+Ln3pIYxp9GQheJTkkwJqzH5?= =?us-ascii?Q?M2opuLmClFLu14HjqHPz0QJu4vygcaSj2Swcn8agpkwY0C50xQSFUxN7Qm0R?= =?us-ascii?Q?KbSMMkYUMdLFY4tXbtbisWnRBUfkNwktrDcrkWt1AIeJbsFoPMhFkJhPjqXN?= =?us-ascii?Q?gMo2u6E=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR11MB5966.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(1800799024)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?Zimf5OLFvxmFdGIoUJh6uxJCeu2KTP2P9bKuOEai7hTNbjLbaoM78QW0WPMi?= =?us-ascii?Q?u2QgHyE2AFcXwhTr3doqrlo3tmfBK+LDyEwWDiIRogQiSsRSMuRLJGYfNf8V?= =?us-ascii?Q?2OLtMQZQhEqg61O216shDnHcOASnq8rLPDkB86Fe9c4iusskcNblWmByLN4N?= =?us-ascii?Q?1zTMko8mmqgvnOp2KJ5RTmbfLAr75mCxEnq1D+qGkOTtjCgQhVCH20JKU1kC?= =?us-ascii?Q?N2o3V+DcEIijx3xsebkToOziWHN6AroX5eGkziQnfzQXEBwLf+js0zOpKv4k?= =?us-ascii?Q?2BpJxB1nmSbwewhbgefv+zu7pBLW+Niho4z2QwHYBs5+ozZAOLgJN3SQNts8?= =?us-ascii?Q?3QVlADTOu2u0aG6nBW8LX+deM4Ml2TL4Qe/jq/gIAx0mbxtw5/7odmi/NNpW?= =?us-ascii?Q?RS1HlHkb6MFQUhKytM5EEKY7khh8bkbPHwlStc+rU1uP/Jhowdz55jeINZmT?= =?us-ascii?Q?0vri2A1UpSYjfnbcml7y8GB/QeVyXagi1h3OSRKkuYSlRnqJSGc0RK8xUX2m?= =?us-ascii?Q?ZL5uzV9pZqOx3HutHf0pCD68SkBf9qNFIqdH5r/vkL3a1BMHYriKVvhaY3BM?= =?us-ascii?Q?OhXD4+Q6gLQuWas3ghZecOrquzVika2G/nK8kqTQ+kk0c/Ly2dYCv+c493Sh?= =?us-ascii?Q?5GIcD1tvZDyIlOU503RinUQyvIXeQDaePtYqdx4P2FA7JEBYo3Rh0pjg1wwF?= =?us-ascii?Q?EUixMMeP/wnuwv3X66MOJyybbaLX64u7tIoaF6BgiNB64g+Ey8yxPxV+2J9F?= =?us-ascii?Q?yyh0xDpkMu/HhNDg0Rkdydhbc4dOgYODLAYPx+lhsy0AAjEsuW4ajGCkdoRt?= =?us-ascii?Q?gs1HpDMYchyfVrpHO0oqaO002+uR2EcdGT4GxJ7FOKoMgbXFejAjx92aSLdo?= =?us-ascii?Q?/YpcxO9YwA8Who2mEsYfDT7xvGhCNjSbVSGSgjO7gOTbn8sF+rtb+tPwc7Ua?= =?us-ascii?Q?iPY4PF4/yqQ+11p+qCuEAARSqRBj6JGQXnjl3P1embYnh0orAV/+PYlUZVAO?= =?us-ascii?Q?qdyGmgljWUqAUDXw0aXPTXf9YbQcSEd8ZoXoDoOWy2IKTOwqexD1iS1RRPrf?= =?us-ascii?Q?MHpFH+e397qYOPV9benvNAqeFeFB6qREz2NIa7WxhUl5xXefvtXAnMFw7dW0?= =?us-ascii?Q?lGsd4ctMdzrqj3oE1AKqGyqKRU3V8Gqeo8wAnu7PSqdpTg9sH09Wm7aFApZE?= =?us-ascii?Q?+9k9MKFxDsfRCwtVZZazukUJLTmjVBwc7og20KRA+xDtZYESY8uWHdJMNzSh?= =?us-ascii?Q?PxIIPTnFX6MI5Km0VFcJwvYpY2ZEXmgu6I0wNWixpeI8jaK6PdoNv4S6tpJz?= =?us-ascii?Q?KkG3X7jfaWUUEhkw7XsT3lKXunXytzuHQtBFmgVa16PohhA1SBbyXGXl9vUK?= =?us-ascii?Q?h8V9iGP5x36QDWP0sBMOYEhB+wkt6cjS6MYBb+YGbj+4hM83R/85lQ0fdhIW?= =?us-ascii?Q?4/xOXr44lr1Ti7bddtRzYAFLOAE0Y8E+Y4HQqGgZo/74MqkLjKTkhZkK4Txb?= =?us-ascii?Q?ZOTohxWU8qEUBH9ehg7HII7EGboDDJKCEIQ+R6539bmY2sqmWnbrYVJpI8wf?= =?us-ascii?Q?E7zw2GTwILxpYvF4Jyx1njn+PL6/q1ljGMQ24x/WHCLhZChUyABYz6LexCrs?= =?us-ascii?Q?iA=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 2745f0fa-8379-43ff-55f4-08dd77ee7863 X-MS-Exchange-CrossTenant-AuthSource: DS7PR11MB5966.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Apr 2025 05:13:46.3363 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Kn9I5FT1LiHYxnE062c5iU1WX0audCSGywJ5ekwABWgk/lcxGGc81tT37JtuzKrzYkeh0wdF1mnbWRF6Qt+8bQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR11MB6945 X-OriginatorOrg: intel.com Hi, AFAIK, the commit c9c1e20b4c7d ("KVM: x86: Introduce Intel specific quirk KVM_X86_QUIRK_IGNORE_GUEST_PAT") which re-allows honoring guest PAT on Intel's platforms has been in kvm/queue now. However, as the quirk is enabled by default, userspace(like QEMU) needs to turn it off by code like "kvm_vm_enable_cap(kvm_state, KVM_CAP_DISABLE_QUIRKS2, 0, KVM_X86_QUIRK_IGNORE_GUEST_PAT)" to honor guest PAT, according to the doc: KVM_X86_QUIRK_IGNORE_GUEST_PAT ... Userspace can disable the quirk to honor guest PAT if it knows that there is no such guest software, for example if it does not expose a bochs graphics device (which is known to have had a buggy driver). Thanks Yan On Thu, Apr 10, 2025 at 01:13:18AM +0000, Myrsky Lintu wrote: > Hello, > > I am completely new to and uninformed about kernel development. I was > pointed here from Mesa documentation for Venus (Vulkan encapsulation for > KVM/QEMU): https://docs.mesa3d.org/drivers/venus.html > > Based on my limited understanding of what has happened here, this patch > series was partially reverted due to an issue with the Bochs DRM driver. > A fix for that issue has been merged months ago according to the link > provided in an earlier message. Since then work on this detail of KVM > seems to have stalled. > > Is it reasonable to ask here for this patch series to be evaluated and > incorporated again? > > My layperson's attempt at applying the series against 6.14.1 source code > failed. In addition to the parts that appear to have already been > incorporated there are some parts of the patch series that are rejected. > I lack the knowledge to correct that. > > Distro kernels currently ship without it which limits the usability of > Venus on AMD and NVIDIA GPUs paired with Intel CPUs. Convincing > individual distro maintainers of the necessity of this patch series > without the specialized knowledge required for understanding what it > does and performing that evaluation is quite hard. If upstream (kernel) > would apply it now the distros would ship a kernel including the > required changes to users, including me, without that multiplicated effort. > > Thank you for your time. If this request is out of place here please > forgive me for engaging this mailing list without a proper understanding > of the list's scope. > > On 2024-10-07 14:04:24, Linux regression tracking (Thorsten Leemhuis) wrote: > > On 07.10.24 15:38, Vitaly Kuznetsov wrote: > >> "Linux regression tracking (Thorsten Leemhuis)" > >> writes: > >> > >>> On 30.08.24 11:35, Vitaly Kuznetsov wrote: > >>>> Sean Christopherson writes: > >>>> > >>>>> Unconditionally honor guest PAT on CPUs that support self-snoop, as > >>>>> Intel has confirmed that CPUs that support self-snoop always snoop caches > >>>>> and store buffers. I.e. CPUs with self-snoop maintain cache coherency > >>>>> even in the presence of aliased memtypes, thus there is no need to trust > >>>>> the guest behaves and only honor PAT as a last resort, as KVM does today. > >>>>> > >>>>> Honoring guest PAT is desirable for use cases where the guest has access > >>>>> to non-coherent DMA _without_ bouncing through VFIO, e.g. when a virtual > >>>>> (mediated, for all intents and purposes) GPU is exposed to the guest, along > >>>>> with buffers that are consumed directly by the physical GPU, i.e. which > >>>>> can't be proxied by the host to ensure writes from the guest are performed > >>>>> with the correct memory type for the GPU. > >>>> > >>>> Necroposting! > >>>> > >>>> Turns out that this change broke "bochs-display" driver in QEMU even > >>>> when the guest is modern (don't ask me 'who the hell uses bochs for > >>>> modern guests', it was basically a configuration error :-). E.g: > >>>> [...] > >>> > >>> This regression made it to the list of tracked regressions. It seems > >>> this thread stalled a while ago. Was this ever fixed? Does not look like > >>> it, but I might have missed something. Or is this a regression I should > >>> just ignore for one reason or another? > >>> > >> > >> The regression was addressed in by reverting 377b2f359d1f in 6.11 > >> > >> commit 9d70f3fec14421e793ffbc0ec2f739b24e534900 > >> Author: Paolo Bonzini > >> Date: Sun Sep 15 02:49:33 2024 -0400 > >> > >> Revert "KVM: VMX: Always honor guest PAT on CPUs that support self-snoop" > > > > Thx. Sorry, missed that, thx for pointing me towards it. I had looked > > for things like that, but seems I messed up my lore query. Apologies for > > the noise! > > > >> Also, there's a (pending) DRM patch fixing it from the guest's side: > >> https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/9388ccf69925223223c87355a417ba39b13a5e8e > > > > Great! > > > > Ciao, Thorsten > > > > P.S.: > > > > #regzbot fix: 9d70f3fec14421e793ffbc0ec2f739b24e534900 > > > > > > > >