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Re: [Qemu-devel] [PATCH v5 0/4] ITS Reset

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v5 0/4] ITS Reset
Date: Fri, 24 Nov 2017 14:20:41 +0000

On 24 November 2017 at 14:18, Eric Auger <address@hidden> wrote:
> At the moment the ITS is not properly reset. On System reset or
> reboot, previous ITS register values and caches are left
> unchanged. Some of the registers might point to some guest RAM
> tables which are not valid anymore. This leads to state
> inconsistencies that are detected by the kernel save/restore
> code. And eventually this may cause qemu abort.
> This series adds vITS reset modality:
> - the 2 first patches bring a minimalist reset through individual
>   register writes. However, with kernel versions < 4.15, this reset
>   is not complete (vITS caches are not voided).
> - With kernel versions >= 4.15 we can rely on a new ITS KVM device
>   reset IOTCL. The last 2 patches introduce the full reset.
> Tested with 4.11, 4.14 and 4.15 host kernels.

Thanks. My remaining question is: how important it is to
put some of this into 2.11? We're getting quite close to
the release now so I'm getting gradually more reluctant
to put in changes.

-- PMM

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