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KVM: selftests: Skip AMX test if ARCH_REQ_XCOMP_GUEST_PERM isn't supported

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Skip the AMX test instead of silently returning if the host kernel
doesn't support ARCH_REQ_XCOMP_GUEST_PERM.  KVM didn't support XFD until
v5.17, so it's extremely unlikely allowing the test to run on a pre-v5.15
kernel is the right thing to do.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-40-seanjc@google.com
This commit is contained in:
Sean Christopherson 2022-06-14 20:07:04 +00:00
parent 7fbb653e01
commit d4c94ee812
1 changed files with 1 additions and 8 deletions
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9
tools/testing/selftests/kvm/lib/x86_64/processor.c
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@ -601,14 +601,7 @@ void vm_xsave_req_perm(int bit)
TEST_REQUIRE(bitmask & (1ULL << bit));
rc = syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit);
/*
* The older kernel version(<5.15) can't support
* ARCH_REQ_XCOMP_GUEST_PERM and directly return.
*/
if (rc)
return;
TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit));
rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask);
TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc);