Add a note about behavioral difference for KVM_EXIT_X86_BUS_LOCK between AMD CPUs and Intel CPUs in KVM_CAP_X86_BUS_LOCK_EXIT capability documentation. Signed-off-by: Manali Shukla <manali.shukla@xxxxxxx> --- Documentation/virt/kvm/api.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index e32471977d0a..49465323dc62 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -7884,6 +7884,10 @@ Note! Detected bus locks may be coincident with other exits to userspace, i.e. KVM_RUN_X86_BUS_LOCK should be checked regardless of the primary exit reason if userspace wants to take action on all detected bus locks. +Note! On AMD CPUs, the bus lock exit to user space occurs with RIP pointing at +the offending instruction. In contrast, on Intel CPUs, the RIP points to the +instruction right after the guilty one after the bus lock exit to user space. + 7.23 KVM_CAP_PPC_DAWR1 ---------------------- -- 2.34.1
