linux-kernel - [PATCH v2 23/31] KVM: selftests: Make it possible to replace PTEs with __virt_pg

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Date:   Thu,  7 Apr 2022 17:56:37 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 23/31] KVM: selftests: Make it possible to replace PTEs with __virt_pg_map()

__virt_pg_map() makes an assumption that leaf PTE is not present. This
is not suitable if the test wants to replace an already present
PTE. Hyper-V PV TLB flush test is going to need that.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 tools/testing/selftests/kvm/include/x86_64/processor.h | 2 +-
 tools/testing/selftests/kvm/lib/x86_64/processor.c     | 6 +++---
 tools/testing/selftests/kvm/max_guest_memory_test.c    | 2 +-
 tools/testing/selftests/kvm/x86_64/mmu_role_test.c     | 2 +-
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 9ad7602a257b..c20b18d05119 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -473,7 +473,7 @@ enum x86_page_size {
 	X86_PAGE_SIZE_1G,
 };
 void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
-		   enum x86_page_size page_size);
+		   enum x86_page_size page_size, bool replace);
 
 /*
  * Basic CPU control in CR0
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index 9f000dfb5594..20df3e84d777 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -229,7 +229,7 @@ static struct pageUpperEntry *virt_create_upper_pte(struct kvm_vm *vm,
 }
 
 void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
-		   enum x86_page_size page_size)
+		   enum x86_page_size page_size, bool replace)
 {
 	const uint64_t pg_size = 1ull << ((page_size * 9) + 12);
 	struct pageUpperEntry *pml4e, *pdpe, *pde;
@@ -270,7 +270,7 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 
 	/* Fill in page table entry. */
 	pte = virt_get_pte(vm, pde->pfn, vaddr, 0);
-	TEST_ASSERT(!pte->present,
+	TEST_ASSERT(replace || !pte->present,
 		    "PTE already present for 4k page at vaddr: 0x%lx\n", vaddr);
 	pte->pfn = paddr >> vm->page_shift;
 	pte->writable = true;
@@ -279,7 +279,7 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 
 void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
 {
-	__virt_pg_map(vm, vaddr, paddr, X86_PAGE_SIZE_4K);
+	__virt_pg_map(vm, vaddr, paddr, X86_PAGE_SIZE_4K, false);
 }
 
 static struct pageTableEntry *_vm_get_page_table_entry(struct kvm_vm *vm, int vcpuid,
diff --git a/tools/testing/selftests/kvm/max_guest_memory_test.c b/tools/testing/selftests/kvm/max_guest_memory_test.c
index 3875c4b23a04..437f77633b0e 100644
--- a/tools/testing/selftests/kvm/max_guest_memory_test.c
+++ b/tools/testing/selftests/kvm/max_guest_memory_test.c
@@ -244,7 +244,7 @@ int main(int argc, char *argv[])
 #ifdef __x86_64__
 		/* Identity map memory in the guest using 1gb pages. */
 		for (i = 0; i < slot_size; i += size_1gb)
-			__virt_pg_map(vm, gpa + i, gpa + i, X86_PAGE_SIZE_1G);
+			__virt_pg_map(vm, gpa + i, gpa + i, X86_PAGE_SIZE_1G, false);
 #else
 		for (i = 0; i < slot_size; i += vm_get_page_size(vm))
 			virt_pg_map(vm, gpa + i, gpa + i);
diff --git a/tools/testing/selftests/kvm/x86_64/mmu_role_test.c b/tools/testing/selftests/kvm/x86_64/mmu_role_test.c
index da2325fcad87..e3fdf320b9f4 100644
--- a/tools/testing/selftests/kvm/x86_64/mmu_role_test.c
+++ b/tools/testing/selftests/kvm/x86_64/mmu_role_test.c
@@ -35,7 +35,7 @@ static void mmu_role_test(u32 *cpuid_reg, u32 evil_cpuid_val)
 	run = vcpu_state(vm, VCPU_ID);
 
 	/* Map 1gb page without a backing memlot. */
-	__virt_pg_map(vm, MMIO_GPA, MMIO_GPA, X86_PAGE_SIZE_1G);
+	__virt_pg_map(vm, MMIO_GPA, MMIO_GPA, X86_PAGE_SIZE_1G, false);
 
 	r = _vcpu_run(vm, VCPU_ID);
 
-- 
2.35.1