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Message-ID: <20251021074736.1324328-19-yosry.ahmed@linux.dev>
Date: Tue, 21 Oct 2025 07:47:31 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Jim Mattson <jmattson@...gle.com>,
kvm@...r.kernel.org,
linux-kernel@...r.kernel.org,
Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH v2 18/23] KVM: selftests: Generalize nested mapping functions
Instead of passing in a pointer to struct vmx_pages, pass in the GPA of
the root of the EPTs, as that's the only member being used. Furthermore,
only use ept_pte_masks for VMX, and use x86_pte_masks otherwise (which
is what NPT uses).
This is in preparation of supporting NPTs as well.
No functional change intended.
Signed-off-by: Yosry Ahmed <yosry.ahmed@...ux.dev>
---
tools/testing/selftests/kvm/include/x86/vmx.h | 6 +++---
.../testing/selftests/kvm/lib/x86/memstress.c | 4 ++--
tools/testing/selftests/kvm/lib/x86/vmx.c | 20 ++++++++++---------
.../selftests/kvm/x86/vmx_dirty_log_test.c | 6 +++---
4 files changed, 19 insertions(+), 17 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/x86/vmx.h b/tools/testing/selftests/kvm/include/x86/vmx.h
index 5aa14ceed050a..4429e83e1f52c 100644
--- a/tools/testing/selftests/kvm/include/x86/vmx.h
+++ b/tools/testing/selftests/kvm/include/x86/vmx.h
@@ -561,11 +561,11 @@ bool load_vmcs(struct vmx_pages *vmx);
bool ept_1g_pages_supported(void);
-void nested_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+void nested_map(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint64_t nested_paddr, uint64_t paddr, uint64_t size);
-void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm,
+void nested_map_memslot(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint32_t memslot);
-void nested_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm,
+void nested_identity_map_1g(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint64_t addr, uint64_t size);
bool kvm_cpu_has_ept(void);
void prepare_eptp(struct vmx_pages *vmx, struct kvm_vm *vm);
diff --git a/tools/testing/selftests/kvm/lib/x86/memstress.c b/tools/testing/selftests/kvm/lib/x86/memstress.c
index 0b1f288ad5564..5ca970a8a5c14 100644
--- a/tools/testing/selftests/kvm/lib/x86/memstress.c
+++ b/tools/testing/selftests/kvm/lib/x86/memstress.c
@@ -70,11 +70,11 @@ void memstress_setup_ept(struct vmx_pages *vmx, struct kvm_vm *vm)
* KVM can shadow the EPT12 with the maximum huge page size supported
* by the backing source.
*/
- nested_identity_map_1g(vmx, vm, 0, 0x100000000ULL);
+ nested_identity_map_1g(vm, vmx->eptp_gpa, 0, 0x100000000ULL);
start = align_down(memstress_args.gpa, PG_SIZE_1G);
end = align_up(memstress_args.gpa + memstress_args.size, PG_SIZE_1G);
- nested_identity_map_1g(vmx, vm, start, end - start);
+ nested_identity_map_1g(vm, vmx->eptp_gpa, start, end - start);
}
void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[])
diff --git a/tools/testing/selftests/kvm/lib/x86/vmx.c b/tools/testing/selftests/kvm/lib/x86/vmx.c
index 75996fc00501e..0573b3ea717cb 100644
--- a/tools/testing/selftests/kvm/lib/x86/vmx.c
+++ b/tools/testing/selftests/kvm/lib/x86/vmx.c
@@ -378,34 +378,36 @@ void prepare_vmcs(struct vmx_pages *vmx, void *guest_rip, void *guest_rsp)
* Within the VM given by vm, creates a nested guest translation for the
* page range starting at nested_paddr to the page range starting at paddr.
*/
-void __nested_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+void __nested_map(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint64_t nested_paddr, uint64_t paddr, uint64_t size,
int level)
{
size_t page_size = PG_LEVEL_SIZE(level);
size_t npages = size / page_size;
+ const struct pte_masks *masks;
+
+ masks = kvm_cpu_has(X86_FEATURE_VMX) ? &ept_pte_masks : &x86_pte_masks;
TEST_ASSERT(nested_paddr + size > nested_paddr, "Vaddr overflow");
TEST_ASSERT(paddr + size > paddr, "Paddr overflow");
while (npages--) {
- __virt_pg_map(vm, vmx->eptp_gpa, nested_paddr, paddr,
- level, &ept_pte_masks);
+ __virt_pg_map(vm, root_gpa, nested_paddr, paddr, level, masks);
nested_paddr += page_size;
paddr += page_size;
}
}
-void nested_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+void nested_map(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint64_t nested_paddr, uint64_t paddr, uint64_t size)
{
- __nested_map(vmx, vm, nested_paddr, paddr, size, PG_LEVEL_4K);
+ __nested_map(vm, root_gpa, nested_paddr, paddr, size, PG_LEVEL_4K);
}
/* Prepare an identity extended page table that maps all the
* physical pages in VM.
*/
-void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm,
+void nested_map_memslot(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint32_t memslot)
{
sparsebit_idx_t i, last;
@@ -419,7 +421,7 @@ void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm,
if (i > last)
break;
- nested_map(vmx, vm,
+ nested_map(vm, root_gpa,
(uint64_t)i << vm->page_shift,
(uint64_t)i << vm->page_shift,
1 << vm->page_shift);
@@ -427,10 +429,10 @@ void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm,
}
/* Identity map a region with 1GiB Pages. */
-void nested_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm,
+void nested_identity_map_1g(struct kvm_vm *vm, vm_paddr_t root_gpa,
uint64_t addr, uint64_t size)
{
- __nested_map(vmx, vm, addr, addr, size, PG_LEVEL_1G);
+ __nested_map(vm, root_gpa, addr, addr, size, PG_LEVEL_1G);
}
bool kvm_cpu_has_ept(void)
diff --git a/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c b/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c
index 98cb6bdab3e6d..e54e6111164e7 100644
--- a/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c
+++ b/tools/testing/selftests/kvm/x86/vmx_dirty_log_test.c
@@ -121,9 +121,9 @@ static void test_vmx_dirty_log(bool enable_ept)
*/
if (enable_ept) {
prepare_eptp(vmx, vm);
- nested_map_memslot(vmx, vm, 0);
- nested_map(vmx, vm, NESTED_TEST_MEM1, GUEST_TEST_MEM, PAGE_SIZE);
- nested_map(vmx, vm, NESTED_TEST_MEM2, GUEST_TEST_MEM, PAGE_SIZE);
+ nested_map_memslot(vm, vmx->eptp_gpa, 0);
+ nested_map(vm, vmx->eptp_gpa, NESTED_TEST_MEM1, GUEST_TEST_MEM, PAGE_SIZE);
+ nested_map(vm, vmx->eptp_gpa, NESTED_TEST_MEM2, GUEST_TEST_MEM, PAGE_SIZE);
}
bmap = bitmap_zalloc(TEST_MEM_PAGES);
--
2.51.0.869.ge66316f041-goog
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