Add a test to access private memory in shared fashion which should exercise implicit memory conversion path using KVM_EXIT_MEMORY_ERROR.
Signed-off-by: Vishal Annapurve vannapurve@google.com --- tools/testing/selftests/kvm/priv_memfd_test.c | 66 +++++++++++++++++++ 1 file changed, 66 insertions(+)
diff --git a/tools/testing/selftests/kvm/priv_memfd_test.c b/tools/testing/selftests/kvm/priv_memfd_test.c index 0e6c19501f27..607fdc149c7d 100644 --- a/tools/testing/selftests/kvm/priv_memfd_test.c +++ b/tools/testing/selftests/kvm/priv_memfd_test.c @@ -121,12 +121,78 @@ static void pmpat_guest_code(void) GUEST_DONE(); }
+/* Test to verify guest shared accesses on private memory with following steps: + * 1) Upon entry, guest signals VMM that it has started. + * 2) VMM populates the shared memory with known pattern and continues guest + * execution. + * 3) Guest reads private gpa range in a shared fashion and verifies that it + * reads what VMM has written in step2. + * 3) Guest writes a different pattern on the shared memory and signals VMM + * that it has updated the shared memory. + * 4) VMM verifies shared memory contents to be same as the data populated + * in step 3 and continues guest execution. + */ +#define PMSAT_ID 1 +#define PMSAT_DESC "PrivateMemorySharedAccessTest" + +/* Guest code execution stages for private mem access test */ +#define PMSAT_GUEST_STARTED 0ULL +#define PMSAT_GUEST_TEST_MEM_UPDATED 1ULL + +static bool pmsat_handle_vm_stage(struct kvm_vm *vm, + void *test_info, + uint64_t stage) +{ + void *shared_mem = ((struct test_run_helper *)test_info)->shared_mem; + + switch (stage) { + case PMSAT_GUEST_STARTED: { + /* Initialize the contents of shared memory */ + memset(shared_mem, SHARED_MEM_DATA_BYTE, TEST_MEM_SIZE); + VM_STAGE_PROCESSED(PMSAT_GUEST_STARTED); + break; + } + case PMSAT_GUEST_TEST_MEM_UPDATED: { + /* verify data to be same as what guest wrote */ + TEST_ASSERT(verify_byte_pattern(shared_mem, + PRIV_MEM_DATA_BYTE, TEST_MEM_SIZE), + "Shared memory view mismatch"); + VM_STAGE_PROCESSED(PMSAT_GUEST_PRIV_MEM_UPDATED); + break; + } + default: + printf("Unhandled VM stage %ld\n", stage); + return false; + } + + return true; +} + +static void pmsat_guest_code(void) +{ + void *shared_mem = (void *)TEST_MEM_GPA; + + GUEST_SYNC(PMSAT_GUEST_STARTED); + GUEST_ASSERT(verify_byte_pattern(shared_mem, + SHARED_MEM_DATA_BYTE, TEST_MEM_SIZE)); + + memset(shared_mem, PRIV_MEM_DATA_BYTE, TEST_MEM_SIZE); + GUEST_SYNC(PMSAT_GUEST_TEST_MEM_UPDATED); + + GUEST_DONE(); +} + static struct test_run_helper priv_memfd_testsuite[] = { [PMPAT_ID] = { .test_desc = PMPAT_DESC, .vmst_handler = pmpat_handle_vm_stage, .guest_fn = pmpat_guest_code, }, + [PMSAT_ID] = { + .test_desc = PMSAT_DESC, + .vmst_handler = pmsat_handle_vm_stage, + .guest_fn = pmsat_guest_code, + }, };
static void handle_vm_exit_hypercall(struct kvm_run *run,