Commit 00e0c947 authored by Oliver Upton's avatar Oliver Upton Committed by Marc Zyngier
Browse files

KVM: arm64: Test that SMC64 arch calls are reserved 



Assert that the SMC64 view of the Arm architecture range is reserved by
KVM and cannot be filtered by userspace.

Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230408121732.3411329-3-oliver.upton@linux.dev
parent 5a23ad65

tools/testing/selftests/kvm/aarch64/smccc_filter.c

+8 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ static void test_filter_reserved_range(void) 
{

	struct kvm_vcpu *vcpu;

	struct kvm_vm *vm = setup_vm(&vcpu);

	uint32_t smc64_fn;

	int r;



	r = __set_smccc_filter(vm, ARM_SMCCC_ARCH_WORKAROUND_1,
@@ -106,6 +107,13 @@ static void test_filter_reserved_range(void) 
	TEST_ASSERT(r < 0 && errno == EEXIST,

		    "Attempt to filter reserved range should return EEXIST");



	smc64_fn = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64,

				      0, 0);



	r = __set_smccc_filter(vm, smc64_fn, 1, KVM_SMCCC_FILTER_DENY);

	TEST_ASSERT(r < 0 && errno == EEXIST,

		    "Attempt to filter reserved range should return EEXIST");



	kvm_vm_free(vm);

}