Hi Oliver, On Wed, Aug 2, 2023 at 1:17 PM Oliver Upton <oliver.upton@xxxxxxxxx> wrote: > > Hi Jing, > > Nothing serious, but when you're replying on a thread can you add a > leading and trailing line of whitespace between the quotation and your > reply? Otherwise threads get really dense and hard to read. Will do. Thanks for the suggestion. > > On Wed, Aug 02, 2023 at 10:19:30AM -0700, Jing Zhang wrote: > > > > + case FAIL_KVM: > > > > + TEST_FAIL("KVM doesn't support guest PAuth!\n"); > > > > > > Why is that a hard failure? The vast majority of the HW out there > > > doesn't support PAuth... > > Since previous TEST_REQUIRES have passed, KVM should be able to > > support guest PAuth. The test will be skipped on those HW without > > PAuth. > > So then what is the purpose of this failure mode? The only case where > this would happen is if KVM is if KVM screwed up the emulation somehow, > took a trap on a PAC instruction or register and reflected that back > into the guest as an UNDEF. You are right about the purpose of this test case. > > That's a perfectly valid thing to test for, but the naming and failure > messages should indicate what actually happened. Sure. Will use more sensible messages. > > > > As I mentioned above, another thing I'd like to see is a set of > > > reference results for a given set of keys and architected algorithm > > > (QARMA3, QARMA5) so that we can compare between implementations > > > (excluding the IMPDEF implementations, of course). > > Sure. Will do. > > I was initially hesitant towards testing PAC like this since it is > entirely a hardware issue besides KVM context switching, but you could > spin this off as a way to test if vCPU save/restore works correctly by > priming the vCPU from userspace. > > Marc, is there something else here you're interested in exercising I > may've missed? > > -- > Thanks, > Oliver Thanks, Jing