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KVM: selftests: aarch64: Test read-only PT memory regions

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Extend the read-only memslot tests in page_fault_test to test
read-only PT (Page table) memslots. Note that this was not allowed
before commit 406504c7b0 ("KVM: arm64: Fix S1PTW handling on RO
memslots") as all S1PTW faults were treated as writes which resulted
in an (unrecoverable) exception inside the guest.

Signed-off-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230127214353.245671-5-ricarkol@google.com
This commit is contained in:
Ricardo Koller 2023-01-27 21:43:53 +00:00 committed by Marc Zyngier
parent 8b03c97fa6
commit 08ddbbdf0b
1 changed files with 11 additions and 7 deletions
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18
tools/testing/selftests/kvm/aarch64/page_fault_test.c
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@ -829,8 +829,9 @@ static void help(char *name)
#define TEST_RO_MEMSLOT(_access, _mmio_handler, _mmio_exits) \
{ \
.name = SCAT3(ro_memslot, _access, _with_af), \
.name = SCAT2(ro_memslot, _access), \
.data_memslot_flags = KVM_MEM_READONLY, \
.pt_memslot_flags = KVM_MEM_READONLY, \
.guest_prepare = { _PREPARE(_access) }, \
.guest_test = _access, \
.mmio_handler = _mmio_handler, \
@ -841,6 +842,7 @@ static void help(char *name)
{ \
.name = SCAT2(ro_memslot_no_syndrome, _access), \
.data_memslot_flags = KVM_MEM_READONLY, \
.pt_memslot_flags = KVM_MEM_READONLY, \
.guest_test = _access, \
.fail_vcpu_run_handler = fail_vcpu_run_mmio_no_syndrome_handler, \
.expected_events = { .fail_vcpu_runs = 1 }, \
@ -849,9 +851,9 @@ static void help(char *name)
#define TEST_RO_MEMSLOT_AND_DIRTY_LOG(_access, _mmio_handler, _mmio_exits, \
_test_check) \
{ \
.name = SCAT3(ro_memslot, _access, _with_af), \
.name = SCAT2(ro_memslot, _access), \
.data_memslot_flags = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES, \
.pt_memslot_flags = KVM_MEM_LOG_DIRTY_PAGES, \
.pt_memslot_flags = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES, \
.guest_prepare = { _PREPARE(_access) }, \
.guest_test = _access, \
.guest_test_check = { _test_check }, \
@ -863,7 +865,7 @@ static void help(char *name)
{ \
.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, \
.pt_memslot_flags = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES, \
.guest_test = _access, \
.guest_test_check = { _test_check }, \
.fail_vcpu_run_handler = fail_vcpu_run_mmio_no_syndrome_handler, \
@ -875,6 +877,7 @@ static void help(char *name)
{ \
.name = SCAT2(ro_memslot_uffd, _access), \
.data_memslot_flags = KVM_MEM_READONLY, \
.pt_memslot_flags = KVM_MEM_READONLY, \
.mem_mark_cmd = CMD_HOLE_DATA | CMD_HOLE_PT, \
.guest_prepare = { _PREPARE(_access) }, \
.guest_test = _access, \
@ -890,6 +893,7 @@ static void help(char *name)
{ \
.name = SCAT2(ro_memslot_no_syndrome, _access), \
.data_memslot_flags = KVM_MEM_READONLY, \
.pt_memslot_flags = KVM_MEM_READONLY, \
.mem_mark_cmd = CMD_HOLE_DATA | CMD_HOLE_PT, \
.guest_test = _access, \
.uffd_data_handler = _uffd_data_handler, \
@ -1024,7 +1028,7 @@ static struct test_desc tests[] = {
guest_check_write_in_dirty_log,
guest_check_s1ptw_wr_in_dirty_log),
/*
* Try accesses when the data memory region is marked read-only
* Access when both the PT and data regions are marked read-only
* (with KVM_MEM_READONLY). Writes with a syndrome result in an
* MMIO exit, writes with no syndrome (e.g., CAS) result in a
* failed vcpu run, and reads/execs with and without syndroms do
@ -1040,7 +1044,7 @@ static struct test_desc tests[] = {
TEST_RO_MEMSLOT_NO_SYNDROME(guest_st_preidx),
/*
* Access when both the data region is both read-only and marked
* The PT and data regions are 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
@ -1065,7 +1069,7 @@ static struct test_desc tests[] = {
guest_check_no_write_in_dirty_log),
/*
* Access when the data region is both read-only and punched with
* The PT and data regions are 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