On Thu, Dec 03, 2020 at 05:01:32PM +0100, David Hildenbrand wrote:
> The real question is: do we even *need* DMA from vfio devices to
> virtio-fs regions? If not (do guests rely on it? what does the spec
> state?), just don't care about vfio at all and don't map anything.
Can DMA to/from the virti
On 03.12.20 16:43, Peter Xu wrote:
> On Thu, Dec 03, 2020 at 11:20:02AM +, Stefan Hajnoczi wrote:
>> On Wed, Dec 02, 2020 at 10:45:11AM -0500, Peter Xu wrote:
>>> On Wed, Dec 02, 2020 at 02:33:56PM +, Stefan Hajnoczi wrote:
On Wed, Nov 25, 2020 at 10:57:11AM -0500, Peter Xu wrote:
On Thu, 3 Dec 2020 10:43:22 -0500
Peter Xu wrote:
> On Thu, Dec 03, 2020 at 11:20:02AM +, Stefan Hajnoczi wrote:
> > On Wed, Dec 02, 2020 at 10:45:11AM -0500, Peter Xu wrote:
> > > On Wed, Dec 02, 2020 at 02:33:56PM +, Stefan Hajnoczi wrote:
> > > > On Wed, Nov 25, 2020 at 10:57:11AM
On Thu, Dec 03, 2020 at 11:20:02AM +, Stefan Hajnoczi wrote:
> On Wed, Dec 02, 2020 at 10:45:11AM -0500, Peter Xu wrote:
> > On Wed, Dec 02, 2020 at 02:33:56PM +, Stefan Hajnoczi wrote:
> > > On Wed, Nov 25, 2020 at 10:57:11AM -0500, Peter Xu wrote:
> > > > On Wed, Nov 25, 2020 at 01:05:25A
On Wed, Dec 02, 2020 at 10:45:11AM -0500, Peter Xu wrote:
> On Wed, Dec 02, 2020 at 02:33:56PM +, Stefan Hajnoczi wrote:
> > On Wed, Nov 25, 2020 at 10:57:11AM -0500, Peter Xu wrote:
> > > On Wed, Nov 25, 2020 at 01:05:25AM +, Justin He wrote:
> > > > > I'd appreciate if you could explain w
Hi, Stefan,
On Wed, Dec 02, 2020 at 02:33:56PM +, Stefan Hajnoczi wrote:
> On Wed, Nov 25, 2020 at 10:57:11AM -0500, Peter Xu wrote:
> > On Wed, Nov 25, 2020 at 01:05:25AM +, Justin He wrote:
> > > > I'd appreciate if you could explain why vfio needs to dma map some
> > > > PROT_NONE
> > >
On Wed, Nov 25, 2020 at 10:57:11AM -0500, Peter Xu wrote:
> On Wed, Nov 25, 2020 at 01:05:25AM +, Justin He wrote:
> > > I'd appreciate if you could explain why vfio needs to dma map some
> > > PROT_NONE
> >
> > Virtiofs will map a PROT_NONE cache window region firstly, then remap the
> > sub
On Wed, Nov 25, 2020 at 01:05:25AM +, Justin He wrote:
> > I'd appreciate if you could explain why vfio needs to dma map some
> > PROT_NONE
>
> Virtiofs will map a PROT_NONE cache window region firstly, then remap the sub
> region of that cache window with read or write permission. I guess thi
Hi Peter
> -Original Message-
> From: Peter Xu
> Sent: Wednesday, November 25, 2020 2:12 AM
> To: Justin He
> Cc: Alex Williamson ; Cornelia Huck
> ; k...@vger.kernel.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] vfio iommu type1: Bypass the vm
Hi, Jia,
On Thu, Nov 19, 2020 at 10:27:37PM +0800, Jia He wrote:
> The permission of vfio iommu is different and incompatible with vma
> permission. If the iotlb->perm is IOMMU_NONE (e.g. qemu side), qemu will
> simply call unmap ioctl() instead of mapping. Hence vfio_dma_map() can't
> map a dma r
; k...@vger.kernel.org; linux-
> > ker...@vger.kernel.org
> > Subject: Re: [PATCH] vfio iommu type1: Bypass the vma permission check in
> > vfio_pin_pages_remote()
> >
> > On Thu, 19 Nov 2020 22:27:37 +0800
> > Jia He wrote:
> >
> > > The permission
Hi Alex, thanks for the comments.
See mine below:
> -Original Message-
> From: Alex Williamson
> Sent: Friday, November 20, 2020 1:05 AM
> To: Justin He
> Cc: Cornelia Huck ; k...@vger.kernel.org; linux-
> ker...@vger.kernel.org
> Subject: Re: [PATCH] vfio iommu
On Thu, 19 Nov 2020 22:27:37 +0800
Jia He wrote:
> The permission of vfio iommu is different and incompatible with vma
> permission. If the iotlb->perm is IOMMU_NONE (e.g. qemu side), qemu will
> simply call unmap ioctl() instead of mapping. Hence vfio_dma_map() can't
> map a dma region with NONE
The permission of vfio iommu is different and incompatible with vma
permission. If the iotlb->perm is IOMMU_NONE (e.g. qemu side), qemu will
simply call unmap ioctl() instead of mapping. Hence vfio_dma_map() can't
map a dma region with NONE permission.
This corner case will be exposed in coming vi
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