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

From: Paolo Bonzini
Date: Fri Nov 21 2014 - 13:37:04 EST

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

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.



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(-)


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