Commit d4c94ee8 authored by Sean Christopherson's avatar Sean Christopherson
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KVM: selftests: Skip AMX test if ARCH_REQ_XCOMP_GUEST_PERM isn't supported 



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: default avatarSean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-40-seanjc@google.com
parent 7fbb653e

tools/testing/selftests/kvm/lib/x86_64/processor.c

+1 −8
Original line number Diff line number Diff line
@@ -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);