mainline inclusion
from mainline-v5.12-rc1
commit d855066f
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NP0K
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d855066f81726155caf766e47eea58ae10b1fd57

-------------------

SVM already has specific handlers of MSR_IA32_DEBUGCTLMSR in the
svm_get/set_msr, so the x86 common part can be safely moved to VMX.
This allows KVM to store the bits it supports in GUEST_IA32_DEBUGCTL.

Add vmx_supported_debugctl() to refactor the throwing logic of #GP.
Signed-off-by: NLike Xu <like.xu@linux.intel.com>
Reviewed-by: NAndi Kleen <ak@linux.intel.com>
Message-Id: <20210108013704.134985-2-like.xu@linux.intel.com>
[Merge parts of Chenyi Qiang's "KVM: X86: Expose bus lock debug exception
 to guest". - Paolo]
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NWangJian <wangjian161@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>