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Re: [PATCH 0/5] buses: switch to 3-phase-reset


From: Cédric Le Goater
Subject: Re: [PATCH 0/5] buses: switch to 3-phase-reset
Date: Mon, 22 Jan 2024 15:19:56 +0100
User-agent: Mozilla Thunderbird

Hello,

On 1/22/24 03:06, Peter Xu wrote:
Hi, Peter,

On Fri, Jan 19, 2024 at 04:35:07PM +0000, Peter Maydell wrote:
I wrote this ages ago and recently picked it back up because of a
recent PCI related reset ordering problem noted by Peter Xu.  I'm not
sure if this patchset is necessary as a part of fixing that ordering
problem (it might even be possible now to have the intel_iommu device
use 3-phase reset and put the relevant parts of its reset into the
'exit' phase), but either way we really ought to do this cleanup
to reduce the amount of legacy/transitional handling we have.

The VFIO issue I was working on may not directly benefit from this series
iiuc, as it's more of an special ordering on both (1) VFIO special case
reset path using qemu_register_reset(), and (2) VT-d device is not put at
the right place in the QOM hierachy [1].

Said that, thanks a lot for posting the patches; they all look reasonable
and good cleanups to the reset infrastructure, afaict.


Yes. I took the series in my vfio testing environment (x86_64 and s390x) and
didn't see any issue. I will keep it for further testing.

Thanks,

C.






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