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KVM: selftests: arm64: Add support for various modes with 16kB page size

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The 16kB page size is not a popular choice, due to only a few CPUs
actually implementing support for it. However, it can lead to some
interesting performance improvements given the right uarch choices.

Add support for this page size for various PA/VA combinations.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Link: https://lore.kernel.org/r/20211227124809.1335409-7-maz@kernel.org
This commit is contained in:
Marc Zyngier 2021-12-27 12:48:09 +00:00
parent e7f58a6bd2
commit aa674de1dc
4 changed files with 34 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/testing/selftests/kvm/include/kvm_util.h
View File

@ -42,14 +42,18 @@ enum vm_guest_mode {
VM_MODE_P52V48_4K,
VM_MODE_P52V48_64K,
VM_MODE_P48V48_4K,
VM_MODE_P48V48_16K,
VM_MODE_P48V48_64K,
VM_MODE_P40V48_4K,
VM_MODE_P40V48_16K,
VM_MODE_P40V48_64K,
VM_MODE_PXXV48_4K, /* For 48bits VA but ANY bits PA */
VM_MODE_P47V64_4K,
VM_MODE_P44V64_4K,
VM_MODE_P36V48_4K,
VM_MODE_P36V48_16K,
VM_MODE_P36V48_64K,
VM_MODE_P36V47_16K,
NUM_VM_MODES,
};

10
tools/testing/selftests/kvm/lib/aarch64/processor.c
View File

@ -252,6 +252,12 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_vcpu_init
case VM_MODE_P36V48_64K:
tcr_el1 |= 1ul << 14; /* TG0 = 64KB */
break;
case VM_MODE_P48V48_16K:
case VM_MODE_P40V48_16K:
case VM_MODE_P36V48_16K:
case VM_MODE_P36V47_16K:
tcr_el1 |= 2ul << 14; /* TG0 = 16KB */
break;
case VM_MODE_P48V48_4K:
case VM_MODE_P40V48_4K:
case VM_MODE_P36V48_4K:
@ -267,15 +273,19 @@ void aarch64_vcpu_setup(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_vcpu_init
tcr_el1 |= 6ul << 32; /* IPS = 52 bits */
break;
case VM_MODE_P48V48_4K:
case VM_MODE_P48V48_16K:
case VM_MODE_P48V48_64K:
tcr_el1 |= 5ul << 32; /* IPS = 48 bits */
break;
case VM_MODE_P40V48_4K:
case VM_MODE_P40V48_16K:
case VM_MODE_P40V48_64K:
tcr_el1 |= 2ul << 32; /* IPS = 40 bits */
break;
case VM_MODE_P36V48_4K:
case VM_MODE_P36V48_16K:
case VM_MODE_P36V48_64K:
case VM_MODE_P36V47_16K:
tcr_el1 |= 1ul << 32; /* IPS = 36 bits */
break;
default:

4
tools/testing/selftests/kvm/lib/guest_modes.c
View File

@ -29,17 +29,21 @@ void guest_modes_append_default(void)
guest_mode_append(VM_MODE_P52V48_64K, ps64k, ps64k);
if (limit >= 48) {
guest_mode_append(VM_MODE_P48V48_4K, ps4k, ps4k);
guest_mode_append(VM_MODE_P48V48_16K, ps16k, ps16k);
guest_mode_append(VM_MODE_P48V48_64K, ps64k, ps64k);
}
if (limit >= 40) {
guest_mode_append(VM_MODE_P40V48_4K, ps4k, ps4k);
guest_mode_append(VM_MODE_P40V48_16K, ps16k, ps16k);
guest_mode_append(VM_MODE_P40V48_64K, ps64k, ps64k);
if (ps4k)
vm_mode_default = VM_MODE_P40V48_4K;
}
if (limit >= 36) {
guest_mode_append(VM_MODE_P36V48_4K, ps4k, ps4k);
guest_mode_append(VM_MODE_P36V48_16K, ps16k, ps16k);
guest_mode_append(VM_MODE_P36V48_64K, ps64k, ps64k);
guest_mode_append(VM_MODE_P36V47_16K, ps16k, ps16k);
}
/*

16
tools/testing/selftests/kvm/lib/kvm_util.c
View File

@ -166,14 +166,18 @@ const char *vm_guest_mode_string(uint32_t i)
[VM_MODE_P52V48_4K] = "PA-bits:52, VA-bits:48, 4K pages",
[VM_MODE_P52V48_64K] = "PA-bits:52, VA-bits:48, 64K pages",
[VM_MODE_P48V48_4K] = "PA-bits:48, VA-bits:48, 4K pages",
[VM_MODE_P48V48_16K] = "PA-bits:48, VA-bits:48, 16K pages",
[VM_MODE_P48V48_64K] = "PA-bits:48, VA-bits:48, 64K pages",
[VM_MODE_P40V48_4K] = "PA-bits:40, VA-bits:48, 4K pages",
[VM_MODE_P40V48_16K] = "PA-bits:40, VA-bits:48, 16K pages",
[VM_MODE_P40V48_64K] = "PA-bits:40, VA-bits:48, 64K pages",
[VM_MODE_PXXV48_4K] = "PA-bits:ANY, VA-bits:48, 4K pages",
[VM_MODE_P47V64_4K] = "PA-bits:47, VA-bits:64, 4K pages",
[VM_MODE_P44V64_4K] = "PA-bits:44, VA-bits:64, 4K pages",
[VM_MODE_P36V48_4K] = "PA-bits:36, VA-bits:48, 4K pages",
[VM_MODE_P36V48_16K] = "PA-bits:36, VA-bits:48, 16K pages",
[VM_MODE_P36V48_64K] = "PA-bits:36, VA-bits:48, 64K pages",
[VM_MODE_P36V47_16K] = "PA-bits:36, VA-bits:47, 16K pages",
};
_Static_assert(sizeof(strings)/sizeof(char *) == NUM_VM_MODES,
"Missing new mode strings?");
@ -187,14 +191,18 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = {
[VM_MODE_P52V48_4K] = { 52, 48, 0x1000, 12 },
[VM_MODE_P52V48_64K] = { 52, 48, 0x10000, 16 },
[VM_MODE_P48V48_4K] = { 48, 48, 0x1000, 12 },
[VM_MODE_P48V48_16K] = { 48, 48, 0x4000, 14 },
[VM_MODE_P48V48_64K] = { 48, 48, 0x10000, 16 },
[VM_MODE_P40V48_4K] = { 40, 48, 0x1000, 12 },
[VM_MODE_P40V48_16K] = { 40, 48, 0x4000, 14 },
[VM_MODE_P40V48_64K] = { 40, 48, 0x10000, 16 },
[VM_MODE_PXXV48_4K] = { 0, 0, 0x1000, 12 },
[VM_MODE_P47V64_4K] = { 47, 64, 0x1000, 12 },
[VM_MODE_P44V64_4K] = { 44, 64, 0x1000, 12 },
[VM_MODE_P36V48_4K] = { 36, 48, 0x1000, 12 },
[VM_MODE_P36V48_16K] = { 36, 48, 0x4000, 14 },
[VM_MODE_P36V48_64K] = { 36, 48, 0x10000, 16 },
[VM_MODE_P36V47_16K] = { 36, 47, 0x4000, 14 },
};
_Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES,
"Missing new mode params?");
@ -263,6 +271,14 @@ struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
case VM_MODE_P36V48_64K:
vm->pgtable_levels = 3;
break;
case VM_MODE_P48V48_16K:
case VM_MODE_P40V48_16K:
case VM_MODE_P36V48_16K:
vm->pgtable_levels = 4;
break;
case VM_MODE_P36V47_16K:
vm->pgtable_levels = 3;
break;
case VM_MODE_PXXV48_4K:
#ifdef __x86_64__
kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits);