[PATCH v6 13/13] KVM: selftests: aarch64: Add mix of tests into page_fault_test

[Ricardo Koller <ricarkol@google.com>]

Add some mix of tests into page_fault_test: memslots with all the
pairwise combinations of read-only, userfaultfd, and dirty-logging.  For
example, writing into a read-only memslot which has a hole handled with
userfaultfd.

Signed-off-by: Ricardo Koller <ricarkol@google.com>
---
 .../selftests/kvm/aarch64/page_fault_test.c   | 155 ++++++++++++++++++
 1 file changed, 155 insertions(+)

diff --git a/tools/testing/selftests/kvm/aarch64/page_fault_test.c b/tools/testing/selftests/kvm/aarch64/page_fault_test.c
index 39fc2103fdd6..60a6a8a45fa4 100644
--- a/tools/testing/selftests/kvm/aarch64/page_fault_test.c
+++ b/tools/testing/selftests/kvm/aarch64/page_fault_test.c
@@ -399,6 +399,12 @@ static void free_uffd(struct test_desc *test, struct uffd_desc *pt_uffd,
 	free(data_args.copy);
 }
 
+static int uffd_no_handler(int mode, int uffd, struct uffd_msg *msg)
+{
+	TEST_FAIL("There was no UFFD fault expected.");
+	return -1;
+}
+
 /* Returns false if the test should be skipped. */
 static bool punch_hole_in_memslot(struct kvm_vm *vm,
 				  struct userspace_mem_region *region)
@@ -827,6 +833,22 @@ static void help(char *name)
 	.expected_events	= { 0 },					\
 }
 
+#define TEST_UFFD_AND_DIRTY_LOG(_access, _with_af, _uffd_data_handler,		\
+				_uffd_faults, _test_check)			\
+{										\
+	.name			= SCAT3(uffd_and_dirty_log, _access, _with_af),	\
+	.data_memslot_flags	= KVM_MEM_LOG_DIRTY_PAGES,			\
+	.pt_memslot_flags	= KVM_MEM_LOG_DIRTY_PAGES,			\
+	.guest_prepare		= { _PREPARE(_with_af),				\
+				    _PREPARE(_access) },			\
+	.guest_test		= _access,					\
+	.mem_mark_cmd		= CMD_HOLE_DATA | CMD_HOLE_PT,			\
+	.guest_test_check	= { _CHECK(_with_af), _test_check },		\
+	.uffd_data_handler	= _uffd_data_handler,				\
+	.uffd_pt_handler	= uffd_pt_write_handler,			\
+	.expected_events	= { .uffd_faults = _uffd_faults, },		\
+}
+
 #define TEST_RO_MEMSLOT(_access, _mmio_handler, _mmio_exits)			\
 {										\
 	.name			= SCAT3(ro_memslot, _access, _with_af),		\
@@ -846,6 +868,59 @@ static void help(char *name)
 	.expected_events	= { .fail_vcpu_runs = 1 },			\
 }
 
+#define TEST_RO_MEMSLOT_AND_DIRTY_LOG(_access, _mmio_handler, _mmio_exits,	\
+				      _test_check)				\
+{										\
+	.name			= SCAT3(ro_memslot, _access, _with_af),		\
+	.data_memslot_flags	= KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES,	\
+	.pt_memslot_flags	= KVM_MEM_LOG_DIRTY_PAGES,			\
+	.guest_prepare		= { _PREPARE(_access) },			\
+	.guest_test		= _access,					\
+	.guest_test_check	= { _test_check },				\
+	.mmio_handler		= _mmio_handler,				\
+	.expected_events	= { .mmio_exits = _mmio_exits},			\
+}
+
+#define TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(_access, _test_check)		\
+{										\
+	.name			= SCAT2(ro_memslot_no_syn_and_dlog, _access),	\
+	.data_memslot_flags	= KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES,	\
+	.pt_memslot_flags	= KVM_MEM_LOG_DIRTY_PAGES,			\
+	.guest_test		= _access,					\
+	.guest_test_check	= { _test_check },				\
+	.fail_vcpu_run_handler	= fail_vcpu_run_mmio_no_syndrome_handler,	\
+	.expected_events	= { .fail_vcpu_runs = 1 },			\
+}
+
+#define TEST_RO_MEMSLOT_AND_UFFD(_access, _mmio_handler, _mmio_exits,		\
+				 _uffd_data_handler, _uffd_faults)		\
+{										\
+	.name			= SCAT2(ro_memslot_uffd, _access),		\
+	.data_memslot_flags	= KVM_MEM_READONLY,				\
+	.mem_mark_cmd		= CMD_HOLE_DATA | CMD_HOLE_PT,			\
+	.guest_prepare		= { _PREPARE(_access) },			\
+	.guest_test		= _access,					\
+	.uffd_data_handler	= _uffd_data_handler,				\
+	.uffd_pt_handler	= uffd_pt_write_handler,			\
+	.mmio_handler		= _mmio_handler,				\
+	.expected_events	= { .mmio_exits = _mmio_exits,			\
+				    .uffd_faults = _uffd_faults },		\
+}
+
+#define TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(_access, _uffd_data_handler,	\
+					     _uffd_faults)			\
+{										\
+	.name			= SCAT2(ro_memslot_no_syndrome, _access),	\
+	.data_memslot_flags	= KVM_MEM_READONLY,				\
+	.mem_mark_cmd		= CMD_HOLE_DATA | CMD_HOLE_PT,			\
+	.guest_test		= _access,					\
+	.uffd_data_handler	= _uffd_data_handler,				\
+	.uffd_pt_handler	= uffd_pt_write_handler,			\
+	.fail_vcpu_run_handler	= fail_vcpu_run_mmio_no_syndrome_handler,	\
+	.expected_events	= { .fail_vcpu_runs = 1,			\
+				    .uffd_faults = _uffd_faults },		\
+}
+
 static struct test_desc tests[] = {
 
 	/* Check that HW is setting the Access Flag (AF) (sanity checks). */
@@ -914,6 +989,35 @@ static struct test_desc tests[] = {
 	TEST_DIRTY_LOG(guest_dc_zva, with_af, guest_check_write_in_dirty_log),
 	TEST_DIRTY_LOG(guest_st_preidx, with_af, guest_check_write_in_dirty_log),
 
+	/*
+	 * Access when the data and PT memslots are both marked for dirty
+	 * logging and UFFD at the same time. The expected result is that
+	 * writes should mark the dirty log and trigger a userfaultfd write
+	 * fault.  Reads/execs should result in a read userfaultfd fault, and
+	 * nothing in the dirty log.  Any S1PTW should result in a write in the
+	 * dirty log and a userfaultfd write.
+	 */
+	TEST_UFFD_AND_DIRTY_LOG(guest_read64, with_af, uffd_data_read_handler, 2,
+			guest_check_no_write_in_dirty_log),
+	/* no_af should also lead to a PT write. */
+	TEST_UFFD_AND_DIRTY_LOG(guest_read64, no_af, uffd_data_read_handler, 2,
+			guest_check_no_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_ld_preidx, with_af, uffd_data_read_handler,
+			2, guest_check_no_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_at, with_af, 0, 1,
+			guest_check_no_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_exec, with_af, uffd_data_read_handler, 2,
+			guest_check_no_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_write64, with_af, uffd_data_write_handler,
+			2, guest_check_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_cas, with_af, uffd_data_read_handler, 2,
+			guest_check_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_dc_zva, with_af, uffd_data_write_handler,
+			2, guest_check_write_in_dirty_log),
+	TEST_UFFD_AND_DIRTY_LOG(guest_st_preidx, with_af,
+			uffd_data_write_handler, 2,
+			guest_check_write_in_dirty_log),
+
 	/*
 	 * Try accesses when the data memslot is marked read-only (with
 	 * KVM_MEM_READONLY). Writes with a syndrome result in an MMIO exit,
@@ -929,6 +1033,57 @@ static struct test_desc tests[] = {
 	TEST_RO_MEMSLOT_NO_SYNDROME(guest_cas),
 	TEST_RO_MEMSLOT_NO_SYNDROME(guest_st_preidx),
 
+	/*
+	 * Access when both the data memslot is both read-only and marked for
+	 * dirty logging at the same time. The expected result is that for
+	 * writes there should be no write in the dirty log. The readonly
+	 * handling is the same as if the memslot was not marked for dirty
+	 * logging: writes with a syndrome result in an MMIO exit, and writes
+	 * with no syndrome result in a failed vcpu run.
+	 */
+	TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_read64, 0, 0,
+			guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_ld_preidx, 0, 0,
+			guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_at, 0, 0,
+			guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_exec, 0, 0,
+			guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_write64, mmio_on_test_gpa_handler,
+			1, guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_dc_zva,
+			guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_cas,
+			guest_check_no_write_in_dirty_log),
+	TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_st_preidx,
+			guest_check_no_write_in_dirty_log),
+
+	/*
+	 * Access when the data memslot is both read-only and punched with
+	 * holes tracked with userfaultfd.  The expected result is the union of
+	 * both userfaultfd and read-only behaviors. For example, write
+	 * accesses result in a userfaultfd write fault and an MMIO exit.
+	 * Writes with no syndrome result in a failed vcpu run and no
+	 * userfaultfd write fault. Reads result in userfaultfd getting
+	 * triggered.
+	 */
+	TEST_RO_MEMSLOT_AND_UFFD(guest_read64, 0, 0,
+			uffd_data_read_handler, 2),
+	TEST_RO_MEMSLOT_AND_UFFD(guest_ld_preidx, 0, 0,
+			uffd_data_read_handler, 2),
+	TEST_RO_MEMSLOT_AND_UFFD(guest_at, 0, 0,
+			uffd_no_handler, 1),
+	TEST_RO_MEMSLOT_AND_UFFD(guest_exec, 0, 0,
+			uffd_data_read_handler, 2),
+	TEST_RO_MEMSLOT_AND_UFFD(guest_write64, mmio_on_test_gpa_handler, 1,
+			uffd_data_write_handler, 2),
+	TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_cas,
+			uffd_data_read_handler, 2),
+	TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_dc_zva,
+			uffd_no_handler, 1),
+	TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_st_preidx,
+			uffd_no_handler, 1),
+
 	{ 0 }
 };
 
-- 
2.37.2.789.g6183377224-goog