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Date: Wed, 28 Aug 2019 13:23:57 +0200
From: Andrew Jones <drjones@...hat.com>
To: Peter Xu <peterx@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
Paolo Bonzini <pbonzini@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Thomas Huth <thuth@...hat.com>
Subject: Re: [PATCH 1/4] KVM: selftests: Move vm type into _vm_create()
internally
On Tue, Aug 27, 2019 at 09:10:12PM +0800, Peter Xu wrote:
> Rather than passing the vm type from the top level to the end of vm
> creation, let's simply keep that as an internal of kvm_vm struct and
> decide the type in _vm_create(). Several reasons for doing this:
>
> - The vm type is only decided by physical address width and currently
> only used in aarch64, so we've got enough information as long as
> we're passing vm_guest_mode into _vm_create(),
>
> - This removes a loop dependency between the vm->type and creation of
> vms. That's why now we need to parse vm_guest_mode twice sometimes,
> once in run_test() and then again in _vm_create(). The follow up
> patches will move on to clean up that as well so we can have a
> single place to decide guest machine types and so.
>
> Note that this patch will slightly change the behavior of aarch64
> tests in that previously most vm_create() callers will directly pass
> in type==0 into _vm_create() but now the type will depend on
> vm_guest_mode, however it shouldn't affect any user because all
> vm_create() users of aarch64 will be using VM_MODE_DEFAULT guest
> mode (which is VM_MODE_P40V48_4K) so at last type will still be zero.
>
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
> tools/testing/selftests/kvm/dirty_log_test.c | 12 +++--------
> .../testing/selftests/kvm/include/kvm_util.h | 2 +-
> tools/testing/selftests/kvm/lib/kvm_util.c | 20 ++++++++++++-------
> 3 files changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
> index dc3346e090f5..424efcf8c734 100644
> --- a/tools/testing/selftests/kvm/dirty_log_test.c
> +++ b/tools/testing/selftests/kvm/dirty_log_test.c
> @@ -249,14 +249,13 @@ 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,
> - unsigned long type)
> + uint64_t extra_mem_pages, void *guest_code)
> {
> 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, type);
> + O_RDWR);
nit: after removing type can O_RDWR go up a line?
> kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
> #ifdef __x86_64__
> vm_create_irqchip(vm);
> @@ -273,7 +272,6 @@ 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:
> @@ -314,10 +312,6 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
> * bits we can change to 39.
> */
> guest_pa_bits = 39;
> -#endif
> -#ifdef __aarch64__
> - if (guest_pa_bits != 40)
> - type = KVM_VM_TYPE_ARM_IPA_SIZE(guest_pa_bits);
> #endif
> max_gfn = (1ul << (guest_pa_bits - guest_page_shift)) - 1;
> guest_page_size = (1ul << guest_page_shift);
> @@ -351,7 +345,7 @@ 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, type);
> + vm = create_vm(mode, VCPU_ID, guest_num_pages, guest_code);
>
> #ifdef USE_CLEAR_DIRTY_LOG
> struct kvm_enable_cap cap = {};
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index 5463b7896a0a..cfc079f20815 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -61,7 +61,7 @@ int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *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);
> + int perm);
nit: can perm go up?
> 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 6e49bb039376..0c7c4368bc14 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -84,7 +84,7 @@ int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap)
> return ret;
> }
>
> -static void vm_open(struct kvm_vm *vm, int perm, unsigned long type)
> +static void vm_open(struct kvm_vm *vm, int perm)
> {
> vm->kvm_fd = open(KVM_DEV_PATH, perm);
> if (vm->kvm_fd < 0)
> @@ -95,7 +95,7 @@ static void vm_open(struct kvm_vm *vm, int perm, unsigned long type)
> exit(KSFT_SKIP);
> }
>
> - vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, type);
> + vm->fd = ioctl(vm->kvm_fd, KVM_CREATE_VM, vm->type);
> TEST_ASSERT(vm->fd >= 0, "KVM_CREATE_VM ioctl failed, "
> "rc: %i errno: %i", vm->fd, errno);
> }
> @@ -131,7 +131,7 @@ _Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES,
> * given by perm (e.g. O_RDWR).
> */
> struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
> - int perm, unsigned long type)
> + int perm)
nit: can perm go up?
> {
> struct kvm_vm *vm;
>
> @@ -139,8 +139,7 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
> TEST_ASSERT(vm != NULL, "Insufficient Memory");
>
> vm->mode = mode;
> - vm->type = type;
> - vm_open(vm, perm, type);
> + vm->type = 0;
>
> /* Setup mode specific traits. */
> switch (vm->mode) {
> @@ -190,6 +189,13 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
> TEST_ASSERT(false, "Unknown guest mode, mode: 0x%x", mode);
> }
>
> +#ifdef __aarch64__
> + if (vm->pa_bits != 40)
> + vm->type = KVM_VM_TYPE_ARM_IPA_SIZE(guest_pa_bits);
^^
should be vm->pa_bits
> +#endif
> +
> + vm_open(vm, perm);
> +
> /* Limit to VA-bit canonical virtual addresses. */
> vm->vpages_valid = sparsebit_alloc();
> sparsebit_set_num(vm->vpages_valid,
> @@ -212,7 +218,7 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
>
> struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
> {
> - return _vm_create(mode, phy_pages, perm, 0);
> + return _vm_create(mode, phy_pages, perm);
> }
>
> /*
> @@ -232,7 +238,7 @@ void kvm_vm_restart(struct kvm_vm *vmp, int perm)
> {
> struct userspace_mem_region *region;
>
> - vm_open(vmp, perm, vmp->type);
> + vm_open(vmp, perm);
> if (vmp->has_irqchip)
> vm_create_irqchip(vmp);
>
> --
> 2.21.0
>
Thanks,
drew
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