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Re: [Qemu-block] Virtio-BLK/SCSI write requests and data payload checksu
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-block] Virtio-BLK/SCSI write requests and data payload checksums |
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Date: |
Wed, 7 Jun 2017 06:26:36 -0400 (EDT) |
> > Yes, it's ugly but it's legal. It probably doesn't happen on real hardware
> > that computes the checksum after or during DMA and has some kind of buffer
> > inside the board. But on virt there is only one copy until we reach the
> > actual physical hardware.
>
> okay, so it's no bug. and there is no way to detect that the page is dirty
> (again). so i need a bounce buffer if i have data checksums?
I think so, yes.
Paolo