kvm: x86: ensure pv_cpuid.features is initialized when enabling cap

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Make the paravirtual cpuid enforcement mechanism idempotent to ioctl()
ordering by updating pv_cpuid.features whenever userspace requests the
capability. Extract this update out of kvm_update_cpuid_runtime() into a
new helper function and move its other call site into
kvm_vcpu_after_set_cpuid() where it more likely belongs.

Fixes: 66570e966d ("kvm: x86: only provide PV features if enabled in guest's CPUID")
Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Message-Id: <20201027231044.655110-5-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Oliver Upton 2020-10-27 16:10:42 -07:00 • committed by Paolo Bonzini

parent 1930e5ddce

commit 01b4f510b9

3 changed files with 19 additions and 7 deletions

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23

arch/x86/kvm/cpuid.c

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arch/x86/kvm/cpuid.h

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arch/x86/kvm/x86.c

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