KVM: nVMX: Fix nested bus lock VM exit

mainline inclusion
from mainline-v5.15-rc4
commit 24a996ad
category: feature
feature: KVM Bus Lock VM Exit
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5RJCB
CVE: N/A
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/


commit/?id=24a996ad

Intel-SIG: commit 24a996ad ("KVM: nVMX: Fix nested bus lock VM exit")

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KVM: nVMX: Fix nested bus lock VM exit

Nested bus lock VM exits are not supported yet. If L2 triggers bus lock
VM exit, it will be directed to L1 VMM, which would cause unexpected
behavior. Therefore, handle L2's bus lock VM exits in L0 directly.

Fixes: fe6b6bc8 ("KVM: VMX: Enable bus lock VM exit")
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20210914095041.29764-1-chenyi.qiang@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Aichun Shi <aichun.shi@intel.com>