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Re: [Qemu-devel] [Bug 788697] Re: [PowerPC] [patch] mtmsr does not prese
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [Bug 788697] Re: [PowerPC] [patch] mtmsr does not preserve high bits of MSR |
Date: |
Thu, 26 May 2011 18:45:40 +0200 |
On 26.05.2011, at 18:09, Nathan Whitehorn wrote:
> ** Patch added: "mtmstr.diff"
>
> https://bugs.launchpad.net/bugs/788697/+attachment/2143748/+files/mtmstr.diff
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/788697
>
> Title:
> [PowerPC] [patch] mtmsr does not preserve high bits of MSR
>
> Status in QEMU:
> New
>
> Bug description:
> The mtmsr instruction on 64-bit PPC does not preserve the high-order
> 32-bits of the MSR the way it is supposed to, instead setting them to
> 0, which takes 64-bit code out of 64-bit mode. There is some code that
> does the right thing, but it brokenly only preserves these bits when
> the thread is not in 64-bit mode (i.e. when it doesn't matter). The
> attached patch unconditionally enables this code when TARGET_PPC64 is
> set, per the ISA spec, which fixes early boot failures trying to start
> FreeBSD/powerpc64 under qemu.
>
Please send the patch as proper patch to the ML and CC me.
Alex
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