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Re: [Qemu-block] Limiting coroutine stack usage

From: Kevin Wolf
Subject: Re: [Qemu-block] Limiting coroutine stack usage
Date: Thu, 22 Feb 2018 11:57:55 +0100
User-agent: Mutt/1.9.1 (2017-09-22)

Am 20.02.2018 um 22:54 hat Paolo Bonzini geschrieben:
> On 20/02/2018 18:04, Peter Lieven wrote:
> > Hi,
> > 
> > I remember we discussed a long time ago to limit the stack usage of all
> > functions that are executed in a coroutine
> > context to a very low value to be able to safely limit the coroutine
> > stack size as well.
> IIRC the only issue was that hw/ide/atapi.c has mutual recursion between
> ide_atapi_cmd_reply_end -> ide_transfer_start -> ahci_start_transfer ->
> ide_atapi_cmd_reply_end.
> But perhaps it's not an issue, somebody needs to audit the code.

I think John intended to get rid of the recursion sometime, but I doubt
he has had the time so far.


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