KVM: SVM: Use wrmsr for switching between guest and host IA32_XSS on AMD

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When the guest can execute the XSAVES/XRSTORS instructions, set the
hardware IA32_XSS MSR to guest/host values on VM-entry/VM-exit.

Note that vcpu->arch.ia32_xss is currently guaranteed to be 0 on AMD,
since there is no way to change it.

Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Change-Id: Id51a782462086e6d7a3ab621838e200f1c005afd
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Aaron Lewis 2019-10-21 16:30:23 -07:00 • committed by Paolo Bonzini

parent 78958563d8

commit 312a1c8779

1 changed files with 23 additions and 0 deletions

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arch/x86/kvm/svm.c

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