From: Nathan Whitehorn <788697@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 788697] Re: [PowerPC] [patch] mtmsr does not preserve high bits of MSR
Date: Thu, 26 May 2011 16:09:30 -0000 [thread overview]
Message-ID: <20110526160931.15535.77446.malone@soybean.canonical.com> (raw)
In-Reply-To: 20110526160930.15535.57397.malonedeb@soybean.canonical.com
** Patch added: "mtmstr.diff"
https://bugs.launchpad.net/bugs/788697/+attachment/2143748/+files/mtmstr.diff
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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.
next prev parent reply other threads:[~2011-05-26 16:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-26 16:09 [Qemu-devel] [Bug 788697] [NEW] [PowerPC] [patch] mtmsr does not preserve high bits of MSR Nathan Whitehorn
2011-05-26 16:09 ` Nathan Whitehorn [this message]
2011-05-26 16:45 ` [Qemu-devel] [Bug 788697] " Alexander Graf
2011-05-26 23:33 ` Nathan Whitehorn
2011-05-26 23:47 ` Alexander Graf
2011-05-31 13:35 ` Nathan Whitehorn
2011-05-31 13:49 ` Alexander Graf
2012-08-03 3:06 ` Samuel Bronson
2016-05-23 19:40 ` thh
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