[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <ZcTq-ecgVAP892X2@arm.com>
Date: Thu, 8 Feb 2024 14:53:45 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: ankita@...dia.com
Cc: jgg@...dia.com, maz@...nel.org, oliver.upton@...ux.dev,
james.morse@....com, suzuki.poulose@....com, yuzenghui@...wei.com,
reinette.chatre@...el.com, surenb@...gle.com, stefanha@...hat.com,
brauner@...nel.org, will@...nel.org, mark.rutland@....com,
alex.williamson@...hat.com, kevin.tian@...el.com,
yi.l.liu@...el.com, ardb@...nel.org, akpm@...ux-foundation.org,
andreyknvl@...il.com, wangjinchao@...sion.com, gshan@...hat.com,
ricarkol@...gle.com, linux-mm@...ck.org, lpieralisi@...nel.org,
rananta@...gle.com, ryan.roberts@....com, aniketa@...dia.com,
cjia@...dia.com, kwankhede@...dia.com, targupta@...dia.com,
vsethi@...dia.com, acurrid@...dia.com, apopple@...dia.com,
jhubbard@...dia.com, danw@...dia.com, kvmarm@...ts.linux.dev,
mochs@...dia.com, zhiw@...dia.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v6 4/4] vfio: convey kvm that the vfio-pci device is wc
safe
+ David H
On Thu, Feb 08, 2024 at 02:16:52AM +0530, ankita@...dia.com wrote:
> From: Ankit Agrawal <ankita@...dia.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@...dia.com>
> Suggested-by: Catalin Marinas <catalin.marinas@....com>
> Acked-by: Jason Gunthorpe <jgg@...dia.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@....com>
Powered by blists - more mailing lists