Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 12:52 PM, Michael S. Tsirkin wrote: > On Mon, Dec 14, 2015 at 09:59:13AM -0800, Alexander Duyck wrote: >> On Mon, Dec 14, 2015 at 9:20 AM, Michael S. Tsirkin wrote: >> > On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: >> >> > This way distro can use a

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 09:59:13AM -0800, Alexander Duyck wrote: > On Mon, Dec 14, 2015 at 9:20 AM, Michael S. Tsirkin wrote: > > On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: > >> > This way distro can use a guest agent to disable > >> > dirtying until before migration starts.

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 9:20 AM, Michael S. Tsirkin wrote: > On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: >> > This way distro can use a guest agent to disable >> > dirtying until before migration starts. >> >> Right. For a v2 version I would definitely want to have some way

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: > > This way distro can use a guest agent to disable > > dirtying until before migration starts. > > Right. For a v2 version I would definitely want to have some way to > limit the scope of this. My main reason for putting this

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 6:00 AM, Michael S. Tsirkin wrote: > On Sun, Dec 13, 2015 at 01:28:31PM -0800, Alexander Duyck wrote: >> This patch is meant to provide the guest with a way of flagging DMA pages >> as being dirty to the host when using a direct-assign device within a >> guest. The

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Sun, Dec 13, 2015 at 01:28:31PM -0800, Alexander Duyck wrote: > This patch is meant to provide the guest with a way of flagging DMA pages > as being dirty to the host when using a direct-assign device within a > guest. The advantage to this approach is that it is fairly simple, however > It

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Sun, Dec 13, 2015 at 01:28:31PM -0800, Alexander Duyck wrote: > This patch is meant to provide the guest with a way of flagging DMA pages > as being dirty to the host when using a direct-assign device within a > guest. The advantage to this approach is that it is fairly simple, however > It

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 6:00 AM, Michael S. Tsirkin wrote: > On Sun, Dec 13, 2015 at 01:28:31PM -0800, Alexander Duyck wrote: >> This patch is meant to provide the guest with a way of flagging DMA pages >> as being dirty to the host when using a direct-assign device within a >>

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: > > This way distro can use a guest agent to disable > > dirtying until before migration starts. > > Right. For a v2 version I would definitely want to have some way to > limit the scope of this. My main reason for putting this

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 9:20 AM, Michael S. Tsirkin wrote: > On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: >> > This way distro can use a guest agent to disable >> > dirtying until before migration starts. >> >> Right. For a v2 version I would definitely want

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 12:52 PM, Michael S. Tsirkin wrote: > On Mon, Dec 14, 2015 at 09:59:13AM -0800, Alexander Duyck wrote: >> On Mon, Dec 14, 2015 at 9:20 AM, Michael S. Tsirkin wrote: >> > On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: >>

Re: [RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

On Mon, Dec 14, 2015 at 09:59:13AM -0800, Alexander Duyck wrote: > On Mon, Dec 14, 2015 at 9:20 AM, Michael S. Tsirkin wrote: > > On Mon, Dec 14, 2015 at 08:34:00AM -0800, Alexander Duyck wrote: > >> > This way distro can use a guest agent to disable > >> > dirtying until before

[RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

This patch is meant to provide the guest with a way of flagging DMA pages as being dirty to the host when using a direct-assign device within a guest. The advantage to this approach is that it is fairly simple, however It currently has a singificant impact on device performance in all the

[RFC PATCH 3/3] x86: Create dma_mark_dirty to dirty pages used for DMA by VM guest

This patch is meant to provide the guest with a way of flagging DMA pages as being dirty to the host when using a direct-assign device within a guest. The advantage to this approach is that it is fairly simple, however It currently has a singificant impact on device performance in all the