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Re: [Qemu-devel] [PATCH v5 03/10] rocker: add register programming guide
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] [PATCH v5 03/10] rocker: add register programming guide |
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Date: |
Thu, 5 Feb 2015 10:45:23 +0000 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Tue, Feb 03, 2015 at 12:08:33PM +0100, Paolo Bonzini wrote:
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> On 02/02/2015 17:19, Stefan Hajnoczi wrote:
> > How does the CPU detect that the device has completed the reset
> > procedure? Is this supposed to be synchronous? If yes, is that a
> > good idea (i.e. hopefully resetting doesn't involve any blocking
> > operations or operations that take a long time)?
>
> Most of the time in QEMU reset is synchronous. Think of block devices
> that do bdrv_drain_all() as part of reset!
That doesn't mean we should add more cases.
Stefan
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