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KVM: selftests: aarch64: Add virt_get_pte_hva() library function

Add a library function to get the PTE (a host virtual address) of a
given GVA. This will be used in a future commit by a test to clear and
check the access flag of a particular page.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Andrew Jones <andrew.jones@linux.dev>
Signed-off-by: Ricardo Koller <ricarkol@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221017195834.2295901-3-ricarkol@google.com

authored by

Ricardo Koller and committed by
Marc Zyngier 228f324d a93871d0

+12 -3
+2
tools/testing/selftests/kvm/include/aarch64/processor.h
··· 109 109 void vm_install_sync_handler(struct kvm_vm *vm, 110 110 int vector, int ec, handler_fn handler); 111 111 112 + uint64_t *virt_get_pte_hva(struct kvm_vm *vm, vm_vaddr_t gva); 113 + 112 114 static inline void cpu_relax(void) 113 115 { 114 116 asm volatile("yield" ::: "memory");
+10 -3
tools/testing/selftests/kvm/lib/aarch64/processor.c
··· 138 138 _virt_pg_map(vm, vaddr, paddr, attr_idx); 139 139 } 140 140 141 - vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) 141 + uint64_t *virt_get_pte_hva(struct kvm_vm *vm, vm_vaddr_t gva) 142 142 { 143 143 uint64_t *ptep; 144 144 ··· 169 169 TEST_FAIL("Page table levels must be 2, 3, or 4"); 170 170 } 171 171 172 - return pte_addr(vm, *ptep) + (gva & (vm->page_size - 1)); 172 + return ptep; 173 173 174 174 unmapped_gva: 175 175 TEST_FAIL("No mapping for vm virtual address, gva: 0x%lx", gva); 176 - exit(1); 176 + exit(EXIT_FAILURE); 177 + } 178 + 179 + vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) 180 + { 181 + uint64_t *ptep = virt_get_pte_hva(vm, gva); 182 + 183 + return pte_addr(vm, *ptep) + (gva & (vm->page_size - 1)); 177 184 } 178 185 179 186 static void pte_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent, uint64_t page, int level)