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kvm: x86: ensure pv_cpuid.features is initialized when enabling cap
Oliver Upton authored
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: 66570e96

 ("kvm: x86: only provide PV features if enabled in guest's CPUID")
Signed-off-by: default avatarOliver Upton <oupton@google.com>
Reviewed-by: default avatarPeter Shier <pshier@google.com>
Message-Id: <20201027231044.655110-5-oupton@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
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