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Re: [Qemu-devel] [PATCH] Fix segfault with ram_size > 4095M without kvm

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] Fix segfault with ram_size > 4095M without kvm
Date: Tue, 23 Feb 2010 15:07:20 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20091209 Fedora/3.0-4.fc12 Lightning/1.0pre Thunderbird/3.0

On 02/23/2010 02:30 PM, Alexander Graf wrote:
On 23.02.2010, at 18:02, Aurelien Jarno wrote:

Ryan Harper a écrit :
Currently, x86_64-softmmu qemu segfaults when trying to use>  4095M memsize.
This patch adds a simple check and error message (much like the 2047 limit on
32-bit hosts) on ram_size in the control path after we determine we're
not using kvm

Upstream qemu-kvm is affected if using the -no-kvm option; this patch address
the segfault there as well.
It looks like workarounding the real bug. At some point both
i386-softmmu (via PAE) and x86_64-softmmu were able to support>  4GB of
memory. I remember adding the support long time ago, and testing it with
32GB of emulated RAM.
Sounds like a perfect candidate for -stable then. For HEAD I agree that finding 
the cause would be the way to go.

No, it's wrong. A good candidate for -stable would be something that fixes the SEGV :-)


Anthony Liguori

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