KVM: X86: Add the Document for KVM_CAP_X86_BUS_LOCK_EXIT

mainline inclusion
from mainline-v5.12-rc1
commit c32b1b89
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=c32b1b89

Intel-SIG: commit c32b1b89 ("KVM: X86: Add the Document for KVM_CAP_X86_BUS_LOCK_EXIT")

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

KVM: X86: Add the Document for KVM_CAP_X86_BUS_LOCK_EXIT

Introduce a new capability named KVM_CAP_X86_BUS_LOCK_EXIT, which is
used to handle bus locks detected in guest. It allows the userspace to
do custom throttling policies to mitigate the 'noisy neighbour' problem.

Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Message-Id: <20201106090315.18606-5-chenyi.qiang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Aichun Shi <aichun.shi@intel.com>