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[2003:cb:c730:2200:7229:83b1:524e:283a]) by smtp.gmail.com with ESMTPSA id en8-20020a056000420800b0033b7d9c14desm3956966wrb.5.2024.02.12.05.16.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Feb 2024 05:16:32 -0800 (PST) Message-ID: <6ab142f0-bf66-4611-915d-938d58a277d3@redhat.com> Date: Mon, 12 Feb 2024 14:16:30 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 4/4] vfio: convey kvm that the vfio-pci device is wc safe To: ankita@nvidia.com, jgg@nvidia.com, maz@kernel.org, oliver.upton@linux.dev, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, reinette.chatre@intel.com, surenb@google.com, stefanha@redhat.com, brauner@kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, alex.williamson@redhat.com, kevin.tian@intel.com, yi.l.liu@intel.com, ardb@kernel.org, akpm@linux-foundation.org, andreyknvl@gmail.com, wangjinchao@xfusion.com, gshan@redhat.com, shahuang@redhat.com, ricarkol@google.com, linux-mm@kvack.org, lpieralisi@kernel.org, rananta@google.com, ryan.roberts@arm.com, linus.walleij@linaro.org, bhe@redhat.com Cc: aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com, targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com, kvmarm@lists.linux.dev, mochs@nvidia.com, zhiw@nvidia.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20240211174705.31992-1-ankita@nvidia.com> <20240211174705.31992-5-ankita@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: kksj9o8o1ngqarx4mtrzrkqnhsoamt3n X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: E3E1DC0021 X-Rspam-User: X-HE-Tag: 1707743796-866289 X-HE-Meta: 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 w+I2jlm+ ec6lT0llnL3EpeIXQnEsW/K0jUqUjRUDSgM3Jk/I1gPv1GBuqXJpilOzrK1icFHAtbWRf X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11.02.24 18:47, ankita@nvidia.com wrote: > From: Ankit Agrawal > > The code to map the MMIO in S2 as NormalNC is enabled when conveyed > that the device is WC safe using a new flag VM_ALLOW_ANY_UNCACHED. > > Make vfio-pci set the VM_ALLOW_ANY_UNCACHED flag. > > This could be extended to other devices in the future once that > is deemed safe. Maybe add some more details how one could make a decision whether it would be safe (either here or in patch #2). > > Suggested-by: Catalin Marinas > Acked-by: Jason Gunthorpe > Acked-by: Catalin Marinas > Signed-off-by: Ankit Agrawal > --- > drivers/vfio/pci/vfio_pci_core.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c > index 1cbc990d42e0..eba2146202f9 100644 > --- a/drivers/vfio/pci/vfio_pci_core.c > +++ b/drivers/vfio/pci/vfio_pci_core.c > @@ -1862,8 +1862,12 @@ int vfio_pci_core_mmap(struct vfio_device *core_vdev, struct vm_area_struct *vma > /* > * See remap_pfn_range(), called from vfio_pci_fault() but we can't > * change vm_flags within the fault handler. Set them now. > + * > + * Set an additional flag VM_ALLOW_ANY_UNCACHED to convey kvm that > + * the device is wc safe. > */ > - vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); > + vm_flags_set(vma, VM_ALLOW_ANY_UNCACHED | VM_IO | VM_PFNMAP | > + VM_DONTEXPAND | VM_DONTDUMP); > vma->vm_ops = &vfio_pci_mmap_ops; > > return 0; Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb