| Message ID | 20240103084535.20162-1-yan.y.zhao@intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | KVM: allow mapping of compound tail pages for IO or PFNMAP mapping | expand |
On Wed, Jan 03, 2024 at 04:45:35PM +0800, Yan Zhao wrote: > Added a selftest set_memory_region_io to test memslots for MMIO BARs. Emm.. "set_memory_region_io" doesn't represent the real testing purpose, but not sure if things like "memory_region_page_refcount_test" become better... > The MMIO BARs' backends are compound/non-compound huge pages serving as > device resources allocated by a mock device driver. > > This selftest will assert and report "errno=14 - Bad address" in vcpu_run() > if any failure is met to add such MMIO BAR memslots. > After MMIO memslots removal, page reference counts of the device resources > are also checked. > > As this selftest will interacts with a mock device "/dev/kvm_mock_device", > it depends on test driver test_kvm_mock_device.ko in the kernel. > CONFIG_TEST_KVM_MOCK_DEVICE=m must be enabled in the kernel. > > Currently, this selftest is only compiled for __x86_64__. > > Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> > --- > tools/testing/selftests/kvm/Makefile | 1 + > .../selftests/kvm/set_memory_region_io.c | 188 ++++++++++++++++++ > 2 files changed, 189 insertions(+) > create mode 100644 tools/testing/selftests/kvm/set_memory_region_io.c > > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile > index 4412b42d95de..9d39514b6403 100644 > --- a/tools/testing/selftests/kvm/Makefile > +++ b/tools/testing/selftests/kvm/Makefile > @@ -144,6 +144,7 @@ TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test > TEST_GEN_PROGS_x86_64 += memslot_perf_test > TEST_GEN_PROGS_x86_64 += rseq_test > TEST_GEN_PROGS_x86_64 += set_memory_region_test > +TEST_GEN_PROGS_x86_64 += set_memory_region_io > TEST_GEN_PROGS_x86_64 += steal_time > TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test > TEST_GEN_PROGS_x86_64 += system_counter_offset_test > diff --git a/tools/testing/selftests/kvm/set_memory_region_io.c b/tools/testing/selftests/kvm/set_memory_region_io.c > new file mode 100644 > index 000000000000..e221103091f4 > --- /dev/null > +++ b/tools/testing/selftests/kvm/set_memory_region_io.c > @@ -0,0 +1,188 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#define _GNU_SOURCE /* for program_invocation_short_name */ > +#include <fcntl.h> > +#include <pthread.h> > +#include <sched.h> > +#include <semaphore.h> > +#include <signal.h> > +#include <stdio.h> > +#include <stdlib.h> > +#include <string.h> > +#include <sys/ioctl.h> > +#include <sys/mman.h> > + > +#include <linux/compiler.h> > + > +#include <test_util.h> > +#include <kvm_util.h> > +#include <processor.h> > + > +#include <../../../../lib/test_kvm_mock_device_uapi.h> > + > +/* > + * Somewhat arbitrary location and slot, intended to not overlap anything. > + */ > +#define MEM_REGION_GPA_BASE 0xc0000000 > +#define RANDOM_OFFSET 0x1000 > +#define MEM_REGION_GPA_RANDOM (MEM_REGION_GPA_BASE + RANDOM_OFFSET) > +#define MEM_REGION_SLOT_ID 10 > + > +static const bool non_compound_supported; > + > +static const uint64_t BASE_VAL = 0x1111; > +static const uint64_t RANDOM_VAL = 0x2222; > + > +static unsigned long bar_size; > + > +static sem_t vcpu_ready; > + > +static void guest_code_read_bar(void) > +{ > + uint64_t val; > + > + GUEST_SYNC(0); > + > + val = READ_ONCE(*((uint64_t *)MEM_REGION_GPA_RANDOM)); > + GUEST_ASSERT_EQ(val, RANDOM_VAL); > + > + val = READ_ONCE(*((uint64_t *)MEM_REGION_GPA_BASE)); > + GUEST_ASSERT_EQ(val, BASE_VAL); > + > + GUEST_DONE(); > +} > + > +static void *vcpu_worker(void *data) > +{ > + struct kvm_vcpu *vcpu = data; > + struct kvm_run *run = vcpu->run; > + struct ucall uc; > + uint64_t cmd; > + > + /* > + * Loop until the guest is done. Re-enter the guest on all MMIO exits, > + * which will occur if the guest attempts to access a memslot after it > + * has been deleted or while it is being moved . > + */ > + while (1) { > + vcpu_run(vcpu); > + > + if (run->exit_reason == KVM_EXIT_IO) { > + cmd = get_ucall(vcpu, &uc); > + if (cmd != UCALL_SYNC) > + break; > + > + sem_post(&vcpu_ready); > + continue; > + } > + > + if (run->exit_reason != KVM_EXIT_MMIO) > + break; Can the KVM_EXIT_MMIO happen on x86 ? IIUC the accessed GVAs in guest code have 1:1 mapping to MEM_REGION_GPA_BASE, which is covered by the memslot, and the memory slot is there until the guest code path done. > + > + TEST_ASSERT(!run->mmio.is_write, "Unexpected exit mmio write"); > + TEST_ASSERT(run->mmio.len == 8, > + "Unexpected exit mmio size = %u", run->mmio.len); > + > + TEST_ASSERT(run->mmio.phys_addr < MEM_REGION_GPA_BASE || > + run->mmio.phys_addr >= MEM_REGION_GPA_BASE + bar_size, > + "Unexpected exit mmio address = 0x%llx", > + run->mmio.phys_addr); Ditto, I just think you don't need this part in this testing. > + } > + > + if (run->exit_reason == KVM_EXIT_IO && cmd == UCALL_ABORT) > + REPORT_GUEST_ASSERT(uc); > + > + return NULL; > +} > + > +static void wait_for_vcpu(void) > +{ > + struct timespec ts; > + > + TEST_ASSERT(!clock_gettime(CLOCK_REALTIME, &ts), > + "clock_gettime() failed: %d\n", errno); > + > + ts.tv_sec += 2; > + TEST_ASSERT(!sem_timedwait(&vcpu_ready, &ts), > + "sem_timedwait() failed: %d\n", errno); > + > + /* Wait for the vCPU thread to reenter the guest. */ > + usleep(100000); In this testing it's not needed. Because you only check guest state after guest code path done, so pthread_join() is enough there. > +} > + > +static void test_kvm_mock_device_bar(bool compound) > +{ > + struct kvm_vm *vm; > + void *mem; > + struct kvm_vcpu *vcpu; > + pthread_t vcpu_thread; > + int fd, ret; > + u32 param_compound = compound; > + u32 inequal = 0; > + > + fd = open("/dev/kvm_mock_device", O_RDWR); > + if (fd < 0) { > + pr_info("Please ensure \"CONFIG_TEST_KVM_MOCK_DEVICE=m\" is enabled in the kernel"); > + pr_info(", and execute\n\"modprobe test_kvm_mock_device\n"); > + } > + TEST_ASSERT(fd >= 0, "Failed to open kvm mock device."); Minor: May better to move this part into main(), highlight it's a must have dependency at beginning. > + > + ret = ioctl(fd, KVM_MOCK_DEVICE_GET_BAR_SIZE, &bar_size); > + TEST_ASSERT(ret == 0, "Failed to get bar size of kvm mock device"); > + > + ret = ioctl(fd, KVM_MOCK_DEVICE_PREPARE_RESOURCE, ¶m_compound); > + TEST_ASSERT(ret == 0, "Failed to prepare resource of kvm mock device"); > + > + mem = mmap(NULL, (size_t)bar_size, PROT_READ | PROT_WRITE, MAP_SHARED, > + fd, 0); > + TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() kvm mock device bar"); > + > + *(u64 *)mem = BASE_VAL; > + *(u64 *)(mem + RANDOM_OFFSET) = RANDOM_VAL; > + > + vm = vm_create_with_one_vcpu(&vcpu, guest_code_read_bar); > + > + vm_set_user_memory_region(vm, MEM_REGION_SLOT_ID, 0, MEM_REGION_GPA_BASE, > + bar_size, mem); > + > + virt_map(vm, MEM_REGION_GPA_BASE, MEM_REGION_GPA_BASE, > + (RANDOM_OFFSET / getpagesize()) + 1); > + > + pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu); > + > + /* Ensure the guest thread is spun up. */ > + wait_for_vcpu(); > + > + pthread_join(vcpu_thread, NULL); > + > + vm_set_user_memory_region(vm, MEM_REGION_SLOT_ID, 0, 0, 0, 0); > + kvm_vm_free(vm); > + > + ret = ioctl(fd, KVM_MOCK_DEVICE_CHECK_BACKEND_REF, &inequal); > + TEST_ASSERT(ret == 0 && inequal == 0, "Incorrect resource ref of KVM device"); > + > + munmap(mem, bar_size); > + close(fd); > +} > + > +static void test_non_compound_backend(void) > +{ > + pr_info("Testing non-compound huge page backend for mem slot\n"); > + test_kvm_mock_device_bar(false); > +} > + > +static void test_compound_backend(void) > +{ > + pr_info("Testing compound huge page backend for mem slot\n"); > + test_kvm_mock_device_bar(true); > +} > + > +int main(int argc, char *argv[]) > +{ > +#ifdef __x86_64__ > + test_compound_backend(); > + if (non_compound_supported) Nobody set this, but the mock device looks already supported it, so how about just run the 2 testings directly here ? > + test_non_compound_backend(); > +#endif > + > + return 0; > +} > -- > 2.17.1 > >
On Fri, Jan 05, 2024 at 02:25:26PM +0800, Yuan Yao wrote: > On Wed, Jan 03, 2024 at 04:45:35PM +0800, Yan Zhao wrote: > > Added a selftest set_memory_region_io to test memslots for MMIO BARs. > > Emm.. "set_memory_region_io" doesn't represent the real testing purpose, > but not sure if things like "memory_region_page_refcount_test" become > better... Hmm, memory_region_io_page_test? Not just ref count is tested. Without patch 1, mapping of pages will even fail. > > > The MMIO BARs' backends are compound/non-compound huge pages serving as > > device resources allocated by a mock device driver. > > > > This selftest will assert and report "errno=14 - Bad address" in vcpu_run() > > if any failure is met to add such MMIO BAR memslots. > > After MMIO memslots removal, page reference counts of the device resources > > are also checked. > > > > As this selftest will interacts with a mock device "/dev/kvm_mock_device", > > it depends on test driver test_kvm_mock_device.ko in the kernel. > > CONFIG_TEST_KVM_MOCK_DEVICE=m must be enabled in the kernel. > > > > Currently, this selftest is only compiled for __x86_64__. > > > > Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> ... > > +static void *vcpu_worker(void *data) > > +{ > > + struct kvm_vcpu *vcpu = data; > > + struct kvm_run *run = vcpu->run; > > + struct ucall uc; > > + uint64_t cmd; > > + > > + /* > > + * Loop until the guest is done. Re-enter the guest on all MMIO exits, > > + * which will occur if the guest attempts to access a memslot after it > > + * has been deleted or while it is being moved . > > + */ > > + while (1) { > > + vcpu_run(vcpu); > > + > > + if (run->exit_reason == KVM_EXIT_IO) { > > + cmd = get_ucall(vcpu, &uc); > > + if (cmd != UCALL_SYNC) > > + break; > > + > > + sem_post(&vcpu_ready); > > + continue; > > + } > > + > > + if (run->exit_reason != KVM_EXIT_MMIO) > > + break; > > Can the KVM_EXIT_MMIO happen on x86 ? IIUC the accessed GVAs > in guest code have 1:1 mapping to MEM_REGION_GPA_BASE, which > is covered by the memslot, and the memory slot is there > until the guest code path done. > It can, if the GPAs accessed by guest code are not even mapped as a memslot. This check is to ensure GPAs are read from the testing memslot for mock IO. > > + > > + TEST_ASSERT(!run->mmio.is_write, "Unexpected exit mmio write"); > > + TEST_ASSERT(run->mmio.len == 8, > > + "Unexpected exit mmio size = %u", run->mmio.len); > > + > > + TEST_ASSERT(run->mmio.phys_addr < MEM_REGION_GPA_BASE || > > + run->mmio.phys_addr >= MEM_REGION_GPA_BASE + bar_size, > > + "Unexpected exit mmio address = 0x%llx", > > + run->mmio.phys_addr); > > Ditto, I just think you don't need this part in this testing. > > > + } > > + > > + if (run->exit_reason == KVM_EXIT_IO && cmd == UCALL_ABORT) > > + REPORT_GUEST_ASSERT(uc); > > + > > + return NULL; > > +} > > + > > +static void wait_for_vcpu(void) > > +{ > > + struct timespec ts; > > + > > + TEST_ASSERT(!clock_gettime(CLOCK_REALTIME, &ts), > > + "clock_gettime() failed: %d\n", errno); > > + > > + ts.tv_sec += 2; > > + TEST_ASSERT(!sem_timedwait(&vcpu_ready, &ts), > > + "sem_timedwait() failed: %d\n", errno); > > + > > + /* Wait for the vCPU thread to reenter the guest. */ > > + usleep(100000); > > In this testing it's not needed. > Because you only check guest state after guest code path done, > so pthread_join() is enough there. Right. Just keep to the convention :) > > > +} > > + > > +static void test_kvm_mock_device_bar(bool compound) > > +{ > > + struct kvm_vm *vm; > > + void *mem; > > + struct kvm_vcpu *vcpu; > > + pthread_t vcpu_thread; > > + int fd, ret; > > + u32 param_compound = compound; > > + u32 inequal = 0; > > + > > + fd = open("/dev/kvm_mock_device", O_RDWR); > > + if (fd < 0) { > > + pr_info("Please ensure \"CONFIG_TEST_KVM_MOCK_DEVICE=m\" is enabled in the kernel"); > > + pr_info(", and execute\n\"modprobe test_kvm_mock_device\n"); > > + } > > + TEST_ASSERT(fd >= 0, "Failed to open kvm mock device."); > > Minor: > May better to move this part into main(), highlight it's a > must have dependency at beginning. I don't think so. main() can do other tests that are not relying on the mock device. Actually I'm not even sure if this test needs to be put in set_memory_region_test.c. > > > + > > + ret = ioctl(fd, KVM_MOCK_DEVICE_GET_BAR_SIZE, &bar_size); > > + TEST_ASSERT(ret == 0, "Failed to get bar size of kvm mock device"); > > + > > + ret = ioctl(fd, KVM_MOCK_DEVICE_PREPARE_RESOURCE, ¶m_compound); > > + TEST_ASSERT(ret == 0, "Failed to prepare resource of kvm mock device"); > > + > > + mem = mmap(NULL, (size_t)bar_size, PROT_READ | PROT_WRITE, MAP_SHARED, > > + fd, 0); > > + TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() kvm mock device bar"); > > + > > + *(u64 *)mem = BASE_VAL; > > + *(u64 *)(mem + RANDOM_OFFSET) = RANDOM_VAL; > > + > > + vm = vm_create_with_one_vcpu(&vcpu, guest_code_read_bar); > > + > > + vm_set_user_memory_region(vm, MEM_REGION_SLOT_ID, 0, MEM_REGION_GPA_BASE, > > + bar_size, mem); > > + > > + virt_map(vm, MEM_REGION_GPA_BASE, MEM_REGION_GPA_BASE, > > + (RANDOM_OFFSET / getpagesize()) + 1); > > + > > + pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu); > > + > > + /* Ensure the guest thread is spun up. */ > > + wait_for_vcpu(); > > + > > + pthread_join(vcpu_thread, NULL); > > + > > + vm_set_user_memory_region(vm, MEM_REGION_SLOT_ID, 0, 0, 0, 0); > > + kvm_vm_free(vm); > > + > > + ret = ioctl(fd, KVM_MOCK_DEVICE_CHECK_BACKEND_REF, &inequal); > > + TEST_ASSERT(ret == 0 && inequal == 0, "Incorrect resource ref of KVM device"); > > + > > + munmap(mem, bar_size); > > + close(fd); > > +} > > + > > +static void test_non_compound_backend(void) > > +{ > > + pr_info("Testing non-compound huge page backend for mem slot\n"); > > + test_kvm_mock_device_bar(false); > > +} > > + > > +static void test_compound_backend(void) > > +{ > > + pr_info("Testing compound huge page backend for mem slot\n"); > > + test_kvm_mock_device_bar(true); > > +} > > + > > +int main(int argc, char *argv[]) > > +{ > > +#ifdef __x86_64__ > > + test_compound_backend(); > > + if (non_compound_supported) > > Nobody set this, but the mock device looks already supported > it, so how about just run the 2 testings directly here ? Without the series "allow mapping non-refcounted pages" [1], the test test_non_compound_backend() will simply fail. I added this test case is to show it non-compound pages as backend can also be tested with this selftest. And actually, I did tested that series with this selftets. So, can remove the "if non_compound_supported" after [1] is merged. [1] https://lore.kernel.org/all/20230911021637.1941096-1-stevensd@google.com/, Thanks > > > + test_non_compound_backend(); > > +#endif > > + > > + return 0; > > +} > > -- > > 2.17.1 > > >
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 4412b42d95de..9d39514b6403 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -144,6 +144,7 @@ TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test TEST_GEN_PROGS_x86_64 += memslot_perf_test TEST_GEN_PROGS_x86_64 += rseq_test TEST_GEN_PROGS_x86_64 += set_memory_region_test +TEST_GEN_PROGS_x86_64 += set_memory_region_io TEST_GEN_PROGS_x86_64 += steal_time TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test TEST_GEN_PROGS_x86_64 += system_counter_offset_test diff --git a/tools/testing/selftests/kvm/set_memory_region_io.c b/tools/testing/selftests/kvm/set_memory_region_io.c new file mode 100644 index 000000000000..e221103091f4 --- /dev/null +++ b/tools/testing/selftests/kvm/set_memory_region_io.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include <fcntl.h> +#include <pthread.h> +#include <sched.h> +#include <semaphore.h> +#include <signal.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/mman.h> + +#include <linux/compiler.h> + +#include <test_util.h> +#include <kvm_util.h> +#include <processor.h> + +#include <../../../../lib/test_kvm_mock_device_uapi.h> + +/* + * Somewhat arbitrary location and slot, intended to not overlap anything. + */ +#define MEM_REGION_GPA_BASE 0xc0000000 +#define RANDOM_OFFSET 0x1000 +#define MEM_REGION_GPA_RANDOM (MEM_REGION_GPA_BASE + RANDOM_OFFSET) +#define MEM_REGION_SLOT_ID 10 + +static const bool non_compound_supported; + +static const uint64_t BASE_VAL = 0x1111; +static const uint64_t RANDOM_VAL = 0x2222; + +static unsigned long bar_size; + +static sem_t vcpu_ready; + +static void guest_code_read_bar(void) +{ + uint64_t val; + + GUEST_SYNC(0); + + val = READ_ONCE(*((uint64_t *)MEM_REGION_GPA_RANDOM)); + GUEST_ASSERT_EQ(val, RANDOM_VAL); + + val = READ_ONCE(*((uint64_t *)MEM_REGION_GPA_BASE)); + GUEST_ASSERT_EQ(val, BASE_VAL); + + GUEST_DONE(); +} + +static void *vcpu_worker(void *data) +{ + struct kvm_vcpu *vcpu = data; + struct kvm_run *run = vcpu->run; + struct ucall uc; + uint64_t cmd; + + /* + * Loop until the guest is done. Re-enter the guest on all MMIO exits, + * which will occur if the guest attempts to access a memslot after it + * has been deleted or while it is being moved . + */ + while (1) { + vcpu_run(vcpu); + + if (run->exit_reason == KVM_EXIT_IO) { + cmd = get_ucall(vcpu, &uc); + if (cmd != UCALL_SYNC) + break; + + sem_post(&vcpu_ready); + continue; + } + + if (run->exit_reason != KVM_EXIT_MMIO) + break; + + TEST_ASSERT(!run->mmio.is_write, "Unexpected exit mmio write"); + TEST_ASSERT(run->mmio.len == 8, + "Unexpected exit mmio size = %u", run->mmio.len); + + TEST_ASSERT(run->mmio.phys_addr < MEM_REGION_GPA_BASE || + run->mmio.phys_addr >= MEM_REGION_GPA_BASE + bar_size, + "Unexpected exit mmio address = 0x%llx", + run->mmio.phys_addr); + } + + if (run->exit_reason == KVM_EXIT_IO && cmd == UCALL_ABORT) + REPORT_GUEST_ASSERT(uc); + + return NULL; +} + +static void wait_for_vcpu(void) +{ + struct timespec ts; + + TEST_ASSERT(!clock_gettime(CLOCK_REALTIME, &ts), + "clock_gettime() failed: %d\n", errno); + + ts.tv_sec += 2; + TEST_ASSERT(!sem_timedwait(&vcpu_ready, &ts), + "sem_timedwait() failed: %d\n", errno); + + /* Wait for the vCPU thread to reenter the guest. */ + usleep(100000); +} + +static void test_kvm_mock_device_bar(bool compound) +{ + struct kvm_vm *vm; + void *mem; + struct kvm_vcpu *vcpu; + pthread_t vcpu_thread; + int fd, ret; + u32 param_compound = compound; + u32 inequal = 0; + + fd = open("/dev/kvm_mock_device", O_RDWR); + if (fd < 0) { + pr_info("Please ensure \"CONFIG_TEST_KVM_MOCK_DEVICE=m\" is enabled in the kernel"); + pr_info(", and execute\n\"modprobe test_kvm_mock_device\n"); + } + TEST_ASSERT(fd >= 0, "Failed to open kvm mock device."); + + ret = ioctl(fd, KVM_MOCK_DEVICE_GET_BAR_SIZE, &bar_size); + TEST_ASSERT(ret == 0, "Failed to get bar size of kvm mock device"); + + ret = ioctl(fd, KVM_MOCK_DEVICE_PREPARE_RESOURCE, ¶m_compound); + TEST_ASSERT(ret == 0, "Failed to prepare resource of kvm mock device"); + + mem = mmap(NULL, (size_t)bar_size, PROT_READ | PROT_WRITE, MAP_SHARED, + fd, 0); + TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() kvm mock device bar"); + + *(u64 *)mem = BASE_VAL; + *(u64 *)(mem + RANDOM_OFFSET) = RANDOM_VAL; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code_read_bar); + + vm_set_user_memory_region(vm, MEM_REGION_SLOT_ID, 0, MEM_REGION_GPA_BASE, + bar_size, mem); + + virt_map(vm, MEM_REGION_GPA_BASE, MEM_REGION_GPA_BASE, + (RANDOM_OFFSET / getpagesize()) + 1); + + pthread_create(&vcpu_thread, NULL, vcpu_worker, vcpu); + + /* Ensure the guest thread is spun up. */ + wait_for_vcpu(); + + pthread_join(vcpu_thread, NULL); + + vm_set_user_memory_region(vm, MEM_REGION_SLOT_ID, 0, 0, 0, 0); + kvm_vm_free(vm); + + ret = ioctl(fd, KVM_MOCK_DEVICE_CHECK_BACKEND_REF, &inequal); + TEST_ASSERT(ret == 0 && inequal == 0, "Incorrect resource ref of KVM device"); + + munmap(mem, bar_size); + close(fd); +} + +static void test_non_compound_backend(void) +{ + pr_info("Testing non-compound huge page backend for mem slot\n"); + test_kvm_mock_device_bar(false); +} + +static void test_compound_backend(void) +{ + pr_info("Testing compound huge page backend for mem slot\n"); + test_kvm_mock_device_bar(true); +} + +int main(int argc, char *argv[]) +{ +#ifdef __x86_64__ + test_compound_backend(); + if (non_compound_supported) + test_non_compound_backend(); +#endif + + return 0; +}
Added a selftest set_memory_region_io to test memslots for MMIO BARs. The MMIO BARs' backends are compound/non-compound huge pages serving as device resources allocated by a mock device driver. This selftest will assert and report "errno=14 - Bad address" in vcpu_run() if any failure is met to add such MMIO BAR memslots. After MMIO memslots removal, page reference counts of the device resources are also checked. As this selftest will interacts with a mock device "/dev/kvm_mock_device", it depends on test driver test_kvm_mock_device.ko in the kernel. CONFIG_TEST_KVM_MOCK_DEVICE=m must be enabled in the kernel. Currently, this selftest is only compiled for __x86_64__. Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> --- tools/testing/selftests/kvm/Makefile | 1 + .../selftests/kvm/set_memory_region_io.c | 188 ++++++++++++++++++ 2 files changed, 189 insertions(+) create mode 100644 tools/testing/selftests/kvm/set_memory_region_io.c