Re: [PATCH 00/13] kvm: selftests: add aarch64 framework and dirty

Suzuki K Poulose <suzuki.poulose@xxxxxxx> · Wed, 19 Sep 2018 14:13:48 +0100

Hi Drew,

On 09/19/2018 01:37 PM, Andrew Jones wrote:
On Tue, Sep 18, 2018 at 07:54:23PM +0200, Andrew Jones wrote:
This series provides KVM selftests that test dirty log tracking on
AArch64 for both 4K and 64K guest page sizes. Additionally the
framework provides an easy way to test dirty log tracking with the
recently posted dynamic IPA and 52bit IPA series[1].

The series breaks down into parts as follows:

  01-02: generalize guest code to host userspace exit support by
         introducing "ucalls" - hypercalls to userspace
  03-05: prepare common code for a new architecture
  06-07: add virtual memory setup support for AArch64
     08: add vcpu setup support for AArch64
     09: port the dirty log test to AArch64
  10-11: add 64K guest page size support for the dirty log test
  12-13: prepare the dirty log test to also test > 40-bit guest
         physical address setups by allowing the test memory
         region to be placed at the top of physical memory

[1] https://www.spinics.net/lists/arm-kernel/msg676819.html


Hi Suzuki,

Here's an [untested] add-on patch that should provide the means to
test dirty logging with a 52-bit guest physical address space.
Hopefully it'll be as easy as compiling and then running with

  $ ./dirty_log_test -t

I will give this series a spin with 52 IPA and let you know.

Thanks
Suzuki


Thanks,
drew

 From 09ea1d724551a95ef9962d357049ef21ea8c77e8 Mon Sep 17 00:00:00 2001
From: Andrew Jones <drjones@xxxxxxxxxx>
Date: Wed, 19 Sep 2018 14:23:30 +0200
Subject: [PATCH] kvm: selftests: aarch64: dirty_log_test: test with 52 PA-bits

Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
---
  tools/testing/selftests/kvm/dirty_log_test.c  | 24 ++++++++++++++++---
  .../testing/selftests/kvm/include/kvm_util.h  |  2 ++
  tools/testing/selftests/kvm/lib/kvm_util.c    | 17 +++++++++----
  .../selftests/kvm/lib/kvm_util_internal.h     |  1 +
  4 files changed, 36 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index d59820cc2d39..c11c76e09766 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -82,6 +82,7 @@ static void guest_code(void)
  static bool host_quit;
  
  /* Points to the test VM memory region on which we track dirty logs */
+static uint8_t host_ipa_limit;
  static void *host_test_mem;
  static uint64_t host_num_pages;
  
@@ -209,12 +210,14 @@ static void vm_dirty_log_verify(unsigned long *bmap)
  }
  
  static struct kvm_vm *create_vm(enum vm_guest_mode mode, uint32_t vcpuid,
-				uint64_t extra_mem_pages, void *guest_code)
+				uint64_t extra_mem_pages, void *guest_code,
+				unsigned long type)
  {
  	struct kvm_vm *vm;
  	uint64_t extra_pg_pages = extra_mem_pages / 512 * 2;
  
-	vm = vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR);
+	vm = _vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages,
+			O_RDWR, type);
  	kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
  #ifdef __x86_64__
  	vm_create_irqchip(vm);
@@ -231,15 +234,22 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
  	struct kvm_vm *vm;
  	uint64_t max_gfn;
  	unsigned long *bmap;
+	unsigned long type = 0;
  
  	switch (mode) {
  	case VM_MODE_P52V48_4K:
  		guest_pa_bits = 52;
  		guest_page_shift = 12;
+#ifdef __aarch64__
+		type = KVM_VM_TYPE_ARM_IPA_SIZE(52);
+#endif
  		break;
  	case VM_MODE_P52V48_64K:
  		guest_pa_bits = 52;
  		guest_page_shift = 16;
+#ifdef __aarch64__
+		type = KVM_VM_TYPE_ARM_IPA_SIZE(52);
+#endif
  		break;
  	case VM_MODE_P40V48_4K:
  		guest_pa_bits = 40;
@@ -273,7 +283,7 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
  	bmap = bitmap_alloc(host_num_pages);
  	host_bmap_track = bitmap_alloc(host_num_pages);
  
-	vm = create_vm(mode, VCPU_ID, guest_num_pages, guest_code);
+	vm = create_vm(mode, VCPU_ID, guest_num_pages, guest_code, type);
  
  	/* Add an extra memory slot for testing dirty logging */
  	vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
@@ -392,6 +402,14 @@ int main(int argc, char *argv[])
  	unsigned int mode;
  	int opt, i;
  
+#ifdef __aarch64__
+	host_ipa_limit = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
+	if (host_ipa_limit == 52) {
+		vm_guest_modes[VM_MODE_P52V48_4K].supported = 1;
+		vm_guest_modes[VM_MODE_P52V48_64K].supported = 1;
+	}
+#endif
+
  	while ((opt = getopt(argc, argv, "hi:I:o:tm:")) != -1) {
  		switch (opt) {
  		case 'i':
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index d76431322a30..5202fce337e3 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -53,6 +53,8 @@ enum vm_mem_backing_src_type {
  int kvm_check_cap(long cap);
  
  struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
+struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
+			  int perm, unsigned long type);
  void kvm_vm_free(struct kvm_vm *vmp);
  void kvm_vm_restart(struct kvm_vm *vmp, int perm);
  void kvm_vm_release(struct kvm_vm *vmp);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 542336db7b4f..e1805c9e0f39 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -62,13 +62,13 @@ int kvm_check_cap(long cap)
  	return ret;
  }
  
-static void vm_open(struct kvm_vm *vm, int perm)
+static void vm_open(struct kvm_vm *vm, int perm, unsigned long type)
  {
  	vm->kvm_fd = open(KVM_DEV_PATH, perm);
  	if (vm->kvm_fd < 0)
  		exit(KSFT_SKIP);
  
-	vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, NULL);
+	vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, type);
  	TEST_ASSERT(vm->fd >= 0, "KVM_CREATE_VM ioctl failed, "
  		"rc: %i errno: %i", vm->fd, errno);
  }
@@ -101,7 +101,8 @@ _Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES,
   * descriptor to control the created VM is created with the permissions
   * given by perm (e.g. O_RDWR).
   */
-struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
+struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
+			  int perm, unsigned long type)
  {
  	struct kvm_vm *vm;
  	int kvm_fd;
@@ -110,7 +111,8 @@ struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
  	TEST_ASSERT(vm != NULL, "Insufficent Memory");
  
  	vm->mode = mode;
-	vm_open(vm, perm);
+	vm->type = type;
+	vm_open(vm, perm, type);
  
  	/* Setup mode specific traits. */
  	switch (vm->mode) {
@@ -166,6 +168,11 @@ struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
  	return vm;
  }
  
+struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
+{
+	return _vm_create(mode, phy_pages, perm, 0);
+}
+
  /*
   * VM Restart
   *
@@ -183,7 +190,7 @@ void kvm_vm_restart(struct kvm_vm *vmp, int perm)
  {
  	struct userspace_mem_region *region;
  
-	vm_open(vmp, perm);
+	vm_open(vmp, perm, vmp->type);
  	if (vmp->has_irqchip)
  		vm_create_irqchip(vmp);
  
diff --git a/tools/testing/selftests/kvm/lib/kvm_util_internal.h b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
index 5e05fb98dc62..51a56102a5c9 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util_internal.h
+++ b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
@@ -44,6 +44,7 @@ struct vcpu {
  
  struct kvm_vm {
  	int mode;
+	unsigned long type;
  	int kvm_fd;
  	int fd;
  	unsigned int pgtable_levels;


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