From: Catalin Marinas <catalin.marinas@arm.com>
To: ankita@nvidia.com
Cc: 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,
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,
ricarkol@google.com, linux-mm@kvack.org, lpieralisi@kernel.org,
rananta@google.com, ryan.roberts@arm.com, 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,
David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH v6 4/4] vfio: convey kvm that the vfio-pci device is wc safe
Date: Thu, 8 Feb 2024 14:53:45 +0000 [thread overview]
Message-ID: <ZcTq-ecgVAP892X2@arm.com> (raw)
In-Reply-To: <20240207204652.22954-5-ankita@nvidia.com>
+ David H
On Thu, Feb 08, 2024 at 02:16:52AM +0530, ankita@nvidia.com wrote:
> From: Ankit Agrawal <ankita@nvidia.com>
>
> 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_VFIO_ALLOW_WC.
>
> Make vfio-pci set the VM_VFIO_ALLOW_WC flag.
>
> This could be extended to other devices in the future once that
> is deemed safe.
>
> Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
> Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
> drivers/vfio/pci/vfio_pci_core.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index 1cbc990d42e0..c3f95ec7fc3a 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -1863,7 +1863,8 @@ 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.
> */
> - vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP);
> + vm_flags_set(vma, VM_VFIO_ALLOW_WC | VM_IO | VM_PFNMAP |
> + VM_DONTEXPAND | VM_DONTDUMP);
> vma->vm_ops = &vfio_pci_mmap_ops;
>
> return 0;
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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next prev parent reply other threads:[~2024-02-08 14:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-07 20:46 [PATCH v6 0/4] kvm: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory ankita
2024-02-07 20:46 ` [PATCH v6 1/4] kvm: arm64: introduce new flag for non-cacheable " ankita
2024-02-08 13:00 ` Catalin Marinas
2024-02-08 13:24 ` Oliver Upton
2024-02-09 14:10 ` Ankit Agrawal
2024-02-08 13:19 ` Will Deacon
2024-02-09 14:12 ` Ankit Agrawal
2024-02-07 20:46 ` [PATCH v6 2/4] mm: introduce new flag to indicate wc safe ankita
2024-02-08 13:03 ` Catalin Marinas
2024-02-08 14:34 ` Jason Gunthorpe
2024-02-07 20:46 ` [PATCH v6 3/4] kvm: arm64: set io memory s2 pte as normalnc for vfio pci device ankita
2024-02-08 13:26 ` Oliver Upton
2024-02-08 14:51 ` Catalin Marinas
2024-02-09 14:05 ` Ankit Agrawal
2024-02-07 20:46 ` [PATCH v6 4/4] vfio: convey kvm that the vfio-pci device is wc safe ankita
2024-02-08 14:53 ` Catalin Marinas [this message]
2024-02-08 17:30 ` Alex Williamson
2024-02-08 17:54 ` Jason Gunthorpe
2024-02-09 14:02 ` Ankit Agrawal
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