tree 8b0118b1786e00c40ce05a0cb3a48e11d2a984c9
parent 2e8cd7a3b82874e9cb3e42d916dda05cd790cc1a
author Xiaoyao Li <xiaoyao.li@intel.com> 1594191047 +0800
committer Paolo Bonzini <pbonzini@redhat.com> 1594239720 -0400

KVM: X86: Reset vcpu->arch.cpuid_nent to 0 if SET_CPUID* fails

Current implementation keeps userspace input of CPUID configuration and
cpuid->nent even if kvm_update_cpuid() fails. Reset vcpu->arch.cpuid_nent
to 0 for the case of failure as a simple fix.

Besides, update the doc to explicitly state that if IOCTL SET_CPUID*
fail KVM gives no gurantee that previous valid CPUID configuration is
kept.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20200708065054.19713-2-xiaoyao.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>