Re: [CFT PATCH 0/2] KVM: support XSAVES usage in the host

From: Wanpeng Li
Date: Sun Nov 23 2014 - 03:24:54 EST


Hi Nadav,
On 11/23/14, 4:16 PM, Nadav Amit wrote:
Iâll try to check it tomorrow (I donât have access to the failing machine at the moment).

If the machine you mentioned support xsaves and what's machine you are using?

Regards,
Wanpeng Li


Thanks for the quick response.

Nadav

On Nov 21, 2014, at 20:31, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:

The first patch ensures that XSAVES is not exposed in the guest until
we emulate MSR_IA32_XSS. The second exports XSAVE data in the correct
format.

I tested these on a non-XSAVES system so they should not be completely
broken, but I need some help. I am not even sure which XSAVE states
are _not_ enabled, and thus compacted, in Linux.

Note that these patches do not add support for XSAVES in the guest yet,
since MSR_IA32_XSS is not emulated.

If they fix the bug Nadav reported, I'll add Reported-by and commit.

Thanks,

Paolo

Paolo Bonzini (2):
kvm: x86: mask out XSAVES
KVM: x86: support XSAVES usage in the host

arch/x86/kvm/cpuid.c | 11 ++++++++++-
arch/x86/kvm/x86.c | 48 +++++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 53 insertions(+), 6 deletions(-)

--
1.8.3.1

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