Re: [PATCH 3/4] x86,module: Detect VMX vs SLD conflicts

Andrew Cooper
2020-04-08T10:15:19Z

On 08/04/2020 10:56, Peter Zijlstra wrote:
>>> + case 0xc1: /* VMCALL */
>>> + case 0xc2: /* VMLAUNCH */
>>> + case 0xc3: /* VMRESUME */
>>> + case 0xc4: /* VMXOFF */
>> case 0xd4: /* VMFUNC */
> As per Andrew, VMCALL and VMFUNC are SMV, and I really only need VMX in
> this case. Including SMV is probably harmless, but I'm thinking a
> smaller function is better.

VMCALL and VMFUNC are both VMX instructions.  VMMCALL (count the M's -
yes it is a different instruction) is SVM, and I forgot VMGEXIT from the
list yesterday which is also SVM.

However, searching for them is probably not helpful.  They are all
guest-only instructions and you wouldn't expect to see them in
hypervisor code.

~Andrew