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Re: [Qemu-devel] [PATCH v2 0/3] target-i386: Use C struct for xsave area
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v2 0/3] target-i386: Use C struct for xsave area layout, offsets & sizes |
Date: |
Tue, 1 Dec 2015 16:28:19 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 01/12/2015 16:25, Eduardo Habkost wrote:
> > I think it's easier to use small guests (i.e. kvm-unit-tests) to test
> > this code.
>
> I agree it's easier, but how likely it is to catch bugs in the
> save/load code? If the code corrupts a register, we need to
> trigger a save/load cycle at the exact moment the guest code is
> using that register. Do we have something that helps us
> repeatedly save/load CPU state while kvm-unit-tests is running?
A vmware magic port read should do that. Put VMPORT_MAGIC in EAX and
VMPORT_CMD_GETVERSION in ECX, then do a 32-bit in from port 0x5658.
Paolo