On Wed, Sep 17, 2025 at 02:48:39PM -0700, Jim Mattson wrote:
Add a new VM mode, VM_MODE_PXXV57_4K, to support tests that require 5-level paging on x86. This mode sets up a 57-bit virtual address space and sets CR4.LA57 in the guest.
Signed-off-by: Jim Mattson jmattson@google.com
.../testing/selftests/kvm/include/kvm_util.h | 1 + tools/testing/selftests/kvm/lib/kvm_util.c | 21 +++++++++++++++++ .../testing/selftests/kvm/lib/x86/processor.c | 23 ++++++++++++------- tools/testing/selftests/kvm/lib/x86/vmx.c | 7 +++--- 4 files changed, 41 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 23a506d7eca3..b6ea5d966715 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -175,6 +175,7 @@ enum vm_guest_mode { VM_MODE_P40V48_16K, VM_MODE_P40V48_64K, VM_MODE_PXXV48_4K, /* For 48bits VA but ANY bits PA */
- VM_MODE_PXXV57_4K, /* For 48bits VA but ANY bits PA */ VM_MODE_P47V64_4K, VM_MODE_P44V64_4K, VM_MODE_P36V48_4K,
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index c3f5142b0a54..6b0e499c6e91 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -232,6 +232,7 @@ const char *vm_guest_mode_string(uint32_t i) [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_PXXV57_4K] = "PA-bits:ANY, VA-bits:57, 4K pages",@@ -259,6 +260,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { [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_PXXV57_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 },
@@ -358,6 +360,25 @@ struct kvm_vm *____vm_create(struct vm_shape shape) vm->va_bits = 48; #else TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86 platforms");
We should probably update TEST_ASSERT(vm->va_bits == 48 || vm->va_bits == 57) above to only assert 48 bits now, right?
+#endif
break;- case VM_MODE_PXXV57_4K:
+#ifdef __x86_64__
kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits);kvm_init_vm_address_properties(vm);/** For 5-level paging, KVM requires LA57 to be enabled, which* requires a 57-bit virtual address space.*/TEST_ASSERT(vm->va_bits == 57,"Linear address width (%d bits) not supported for VM_MODE_PXXV57_4K",vm->va_bits);pr_debug("Guest physical address width detected: %d\n",vm->pa_bits);vm->pgtable_levels = 5;vm->va_bits = 57;+#else
TEST_FAIL("VM_MODE_PXXV57_4K not supported on non-x86 platforms");#endif break; case VM_MODE_P47V64_4K: diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testing/selftests/kvm/lib/x86/processor.c index 433365c8196d..d566190ea488 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -124,10 +124,11 @@ bool kvm_is_tdp_enabled(void) void virt_arch_pgd_alloc(struct kvm_vm *vm) {
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K ||
vm->mode == VM_MODE_PXXV57_4K,"Unknown or unsupported guest mode: 0x%x", vm->mode);
- /* If needed, create page map l4 table. */
- /* If needed, create the top-level page table. */ if (!vm->pgd_created) { vm->pgd = vm_alloc_page_table(vm); vm->pgd_created = true;
@@ -187,8 +188,9 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) uint64_t *pte = &vm->pgd; int current_level;
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K,
"Unknown or unsupported guest mode, mode: 0x%x", vm->mode);
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K ||
vm->mode == VM_MODE_PXXV57_4K,"Unknown or unsupported guest mode: 0x%x", vm->mode);TEST_ASSERT((vaddr % pg_size) == 0, "Virtual address not aligned,\n" @@ -279,8 +281,9 @@ uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, TEST_ASSERT(*level >= PG_LEVEL_NONE && *level < PG_LEVEL_NUM, "Invalid PG_LEVEL_* '%d'", *level);
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K ||
vm->mode == VM_MODE_PXXV57_4K,"Unknown or unsupported guest mode: 0x%x", vm->mode);@@ -481,7 +484,9 @@ static void vcpu_init_sregs(struct kvm_vm *vm, struct kvm_vcpu *vcpu) { struct kvm_sregs sregs;
- TEST_ASSERT_EQ(vm->mode, VM_MODE_PXXV48_4K);
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K ||
vm->mode == VM_MODE_PXXV57_4K,"Unknown or unsupported guest mode: 0x%x", vm->mode);/* Set mode specific system register values. */ vcpu_sregs_get(vcpu, &sregs); @@ -495,6 +500,8 @@ static void vcpu_init_sregs(struct kvm_vm *vm, struct kvm_vcpu *vcpu) sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR; if (kvm_cpu_has(X86_FEATURE_XSAVE)) sregs.cr4 |= X86_CR4_OSXSAVE;
- if (vm->pgtable_levels == 5)
sregs.cr4 |= X86_CR4_LA57;kvm_seg_set_unusable(&sregs.ldt); diff --git a/tools/testing/selftests/kvm/lib/x86/vmx.c b/tools/testing/selftests/kvm/lib/x86/vmx.c index d4d1208dd023..1b6d4a007798 100644 --- a/tools/testing/selftests/kvm/lib/x86/vmx.c +++ b/tools/testing/selftests/kvm/lib/x86/vmx.c @@ -401,11 +401,12 @@ void __nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm, struct eptPageTableEntry *pt = vmx->eptp_hva, *pte; uint16_t index;
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);
- TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K ||
vm->mode == VM_MODE_PXXV57_4K,"Unknown or unsupported guest mode: 0x%x", vm->mode);TEST_ASSERT((nested_paddr >> 48) == 0,
"Nested physical address 0x%lx requires 5-level paging",
"Nested physical address 0x%lx is > 48-bits and requires 5-level EPT",-- 2.51.0.470.ga7dc726c21-goog