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Re: [Qemu-devel] [PATCH v3 0/3] Sync MTRRs with KVM and disable on reset


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v3 0/3] Sync MTRRs with KVM and disable on reset
Date: Mon, 25 Aug 2014 18:49:55 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.7.0

Il 14/08/2014 23:39, Alex Williamson ha scritto:
> v3:
>  - Fix off-by-one identified by Laszlo in 2/3
>  - Add R-b in 1 & 3
> 
> It turns out that not only do we not follow the SDM guidelines for
> reseting MTRR state on vCPU reset, but we really don't even attempt
> to keep KVM MTRR state synchronized with QEMU, which affects not
> only reset, but migration.  This series implements the get/put MSR
> support for KVM, then goes on to properly re-initialize the state on
> vCPU reset.  This resolves the problem described in the last patch
> as well as some potential mismatches around migration.  The migration
> state is unchanged, other than actually passing valid data.
> 
> Thanks to Laszlo for his help debugging this and realization of how
> terribly broken MTRR synchronization is.  Thanks,

Applying to uq/master, thanks.

Paolo




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