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Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS
From: |
Samuel Thibault |
Subject: |
Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS |
Date: |
Wed, 25 Mar 2009 17:46:49 +0100 |
User-agent: |
Mutt/1.5.12-2006-07-14 |
Stefano Stabellini, le Wed 25 Mar 2009 16:19:58 +0000, a écrit :
> Avi Kivity wrote:
>
> > Stefano Stabellini wrote:
> >> Hi all,
> >> after the recent introduction of dma_buf_prepare we stopped honoring
> >> IDE_DMA_BUF_SECTORS (the guest can issue dma requests with a greater
> >> total length than IDE_DMA_BUF_SECTORS).
> >> This patch adds the IDE_DMA_BUF_SECTORS limit back in place.
> >>
> >> Comments are welcome.
> >>
> >
> > Aren't 64K sector requests legal?
> >
> > Looking at ide_cmd_lba48_transform().
> >
>
>
> I am not sure about that, but I would think not since we define
> MAX_MULT_SECTORS 16
> If I change MAX_MULT_SECTORS, am I supposed to see smaller dma requests?
Do not confuse things. MAX_MULT_SECTORS is for multi-sectors PIO, not
for DMA.
Samuel
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, (continued)
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Samuel Thibault, 2009/03/26
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Avi Kivity, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Samuel Thibault, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Avi Kivity, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Samuel Thibault, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Christoph Hellwig, 2009/03/26
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Samuel Thibault, 2009/03/26
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Avi Kivity, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Samuel Thibault, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS, Avi Kivity, 2009/03/27
- Re: [Qemu-devel] [PATCH] honor IDE_DMA_BUF_SECTORS,
Samuel Thibault <=