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Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of
From: |
Matthew Wilcox |
Subject: |
Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER |
Date: |
Fri, 10 Mar 2017 13:18:25 -0800 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
On Fri, Mar 10, 2017 at 09:10:53PM +0200, Michael S. Tsirkin wrote:
> > I completely agree with you that we should be able to pass a hugepage
> > as a single chunk. Also we shouldn't assume that host and guest have
> > the same page size. I think we can come up with a scheme that actually
> > lets us encode that into a 64-bit word, something like this:
> >
> > bit 0 clear => bits 1-11 encode a page count, bits 12-63 encode a PFN, page
> > size 4k.
> > bit 0 set, bit 1 clear => bits 2-12 encode a page count, bits 13-63 encode
> > a PFN, page size 8k
> > bits 0+1 set, bit 2 clear => bits 3-13 for page count, bits 14-63 for PFN,
> > page size 16k.
> > bits 0-2 set, bit 3 clear => bits 4-14 for page count, bits 15-63 for PFN,
> > page size 32k
> > bits 0-3 set, bit 4 clear => bits 5-15 for page count, bits 16-63 for PFN,
> > page size 64k
>
> huge page sizes go up to gigabytes.
There was supposed to be a '...' there. For a 16GB hugepage (largest
size I know of today), that'd be:
bits 0-21 set, 22 clear, 23-33 page count, 34-63 PFN, page size 16G
- [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, (continued)
- [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Wei Wang, 2017/03/03
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Matthew Wilcox, 2017/03/09
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Michael S. Tsirkin, 2017/03/10
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Matthew Wilcox, 2017/03/10
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Michael S. Tsirkin, 2017/03/11
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Wei Wang, 2017/03/11
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Matthew Wilcox, 2017/03/11
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Wang, Wei W, 2017/03/11
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Michael S. Tsirkin, 2017/03/11
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Wang, Wei W, 2017/03/13
- Re: [Qemu-devel] [PATCH v7 kernel 3/5] virtio-balloon: implementation of VIRTIO_BALLOON_F_CHUNK_TRANSFER, Michael S. Tsirkin, 2017/03/11
[Qemu-devel] [PATCH v7 kernel 5/5] This patch contains two parts:, Wei Wang, 2017/03/03