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authorPaolo Bonzini <pbonzini@redhat.com>2021-05-06 06:30:04 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2021-05-07 06:06:20 -0400
commit76ea438b4afcd9ee8da3387e9af4625eaccff58f (patch)
tree36518e96f9c98f5277e30167520243e724ee1c45 /arch/csky/kernel
parente8ea85fb280ec55674bca88ea7cd85f60d19567f (diff)
downloadlinux-76ea438b4afcd9ee8da3387e9af4625eaccff58f.tar.bz2
KVM: X86: Expose bus lock debug exception to guest
Bus lock debug exception is an ability to notify the kernel by an #DB trap after the instruction acquires a bus lock and is executed when CPL>0. This allows the kernel to enforce user application throttling or mitigations. Existence of bus lock debug exception is enumerated via CPUID.(EAX=7,ECX=0).ECX[24]. Software can enable these exceptions by setting bit 2 of the MSR_IA32_DEBUGCTL. Expose the CPUID to guest and emulate the MSR handling when guest enables it. Support for this feature was originally developed by Xiaoyao Li and Chenyi Qiang, but code has since changed enough that this patch has nothing in common with theirs, except for this commit message. Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com> Message-Id: <20210202090433.13441-4-chenyi.qiang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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