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Re: [Qemu-devel] [PATCH] User mode: Handle x86_64 vsyscall

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH] User mode: Handle x86_64 vsyscall
Date: Sat, 06 Feb 2010 12:12:42 -0800
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1

On 02/05/2010 02:57 PM, Stefan Weil wrote:
I tried to modify x86_64-linux-user to set up a vsyscall page in high
memory, but this seems to be difficult (at least with 32 bit host).

A 64-bit userland guest can only use the low 32-bits of its address space with a 32-bit host at the moment. If you can set up the vsyscall page in low memory, then you may be able to get this to work.

Otherwise you'll have to wait for someone to re-write the userland memory management in qemu.


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