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Message-ID: <20250917215031.2567566-4-jmattson@google.com>
Date: Wed, 17 Sep 2025 14:48:39 -0700
From: Jim Mattson <jmattson@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>,
Sean Christopherson <seanjc@...gle.com>, Bibo Mao <maobibo@...ngson.cn>,
Huacai Chen <chenhuacai@...nel.org>, Andrew Jones <ajones@...tanamicro.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>, "Pratik R. Sampat" <prsampat@....com>,
Kai Huang <kai.huang@...el.com>, Eric Auger <eric.auger@...hat.com>,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-kselftest@...r.kernel.org
Cc: Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 3/4] KVM: selftests: Add VM_MODE_PXXV57_4K VM mode
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@...gle.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",
[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",
@@ -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");
+#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);
TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
(vaddr >> vm->page_shift)),
"Invalid virtual address, vaddr: 0x%lx",
@@ -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;
sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX);
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",
nested_paddr);
TEST_ASSERT((nested_paddr % page_size) == 0,
"Nested physical address not on page boundary,\n"
--
2.51.0.470.ga7dc726c21-goog
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