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KVM: selftests: x86: Add test for KVM_PRE_FAULT_MEMORY

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Add a test case to exercise KVM_PRE_FAULT_MEMORY and run the guest to access the
pre-populated area.  It tests KVM_PRE_FAULT_MEMORY ioctl for KVM_X86_DEFAULT_VM
and KVM_X86_SW_PROTECTED_VM.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Message-ID: <32427791ef42e5efaafb05d2ac37fa4372715f47.1712785629.git.isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata 2024-04-10 15:07:36 -07:00 committed by Paolo Bonzini
parent 6e01b7601d
commit 9ff0e37c68
3 changed files with 159 additions and 2 deletions
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14
tools/include/uapi/linux/kvm.h
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@ -917,6 +917,7 @@ struct kvm_enable_cap {
#define KVM_CAP_MEMORY_ATTRIBUTES 233
#define KVM_CAP_GUEST_MEMFD 234
#define KVM_CAP_VM_TYPES 235
#define KVM_CAP_PRE_FAULT_MEMORY 236
struct kvm_irq_routing_irqchip {
__u32 irqchip;
@ -1221,9 +1222,9 @@ struct kvm_vfio_spapr_tce {
/* Available with KVM_CAP_SPAPR_RESIZE_HPT */
#define KVM_PPC_RESIZE_HPT_PREPARE _IOR(KVMIO, 0xad, struct kvm_ppc_resize_hpt)
#define KVM_PPC_RESIZE_HPT_COMMIT _IOR(KVMIO, 0xae, struct kvm_ppc_resize_hpt)
/* Available with KVM_CAP_PPC_RADIX_MMU or KVM_CAP_PPC_MMU_HASH_V3 */
/* Available with KVM_CAP_PPC_MMU_RADIX or KVM_CAP_PPC_MMU_HASH_V3 */
#define KVM_PPC_CONFIGURE_V3_MMU _IOW(KVMIO, 0xaf, struct kvm_ppc_mmuv3_cfg)
/* Available with KVM_CAP_PPC_RADIX_MMU */
/* Available with KVM_CAP_PPC_MMU_RADIX */
#define KVM_PPC_GET_RMMU_INFO _IOW(KVMIO, 0xb0, struct kvm_ppc_rmmu_info)
/* Available with KVM_CAP_PPC_GET_CPU_CHAR */
#define KVM_PPC_GET_CPU_CHAR _IOR(KVMIO, 0xb1, struct kvm_ppc_cpu_char)
@ -1548,4 +1549,13 @@ struct kvm_create_guest_memfd {
__u64 reserved[6];
};
#define KVM_PRE_FAULT_MEMORY _IOWR(KVMIO, 0xd5, struct kvm_pre_fault_memory)
struct kvm_pre_fault_memory {
__u64 gpa;
__u64 size;
__u64 flags;
__u64 padding[5];
};
#endif /* __LINUX_KVM_H */

1
tools/testing/selftests/kvm/Makefile
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@ -145,6 +145,7 @@ TEST_GEN_PROGS_x86_64 += set_memory_region_test
TEST_GEN_PROGS_x86_64 += steal_time
TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test
TEST_GEN_PROGS_x86_64 += system_counter_offset_test
TEST_GEN_PROGS_x86_64 += pre_fault_memory_test
# Compiled outputs used by test targets
TEST_GEN_PROGS_EXTENDED_x86_64 += x86_64/nx_huge_pages_test

146
tools/testing/selftests/kvm/pre_fault_memory_test.c Normal file
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@ -0,0 +1,146 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2024, Intel, Inc
*
* Author:
* Isaku Yamahata <isaku.yamahata at gmail.com>
*/
#include <linux/sizes.h>
#include <test_util.h>
#include <kvm_util.h>
#include <processor.h>
/* Arbitrarily chosen values */
#define TEST_SIZE (SZ_2M + PAGE_SIZE)
#define TEST_NPAGES (TEST_SIZE / PAGE_SIZE)
#define TEST_SLOT 10
static void guest_code(uint64_t base_gpa)
{
volatile uint64_t val __used;
int i;
for (i = 0; i < TEST_NPAGES; i++) {
uint64_t *src = (uint64_t *)(base_gpa + i * PAGE_SIZE);
val = *src;
}
GUEST_DONE();
}
static void pre_fault_memory(struct kvm_vcpu *vcpu, u64 gpa, u64 size,
u64 left)
{
struct kvm_pre_fault_memory range = {
.gpa = gpa,
.size = size,
.flags = 0,
};
u64 prev;
int ret, save_errno;
do {
prev = range.size;
ret = __vcpu_ioctl(vcpu, KVM_PRE_FAULT_MEMORY, &range);
save_errno = errno;
TEST_ASSERT((range.size < prev) ^ (ret < 0),
"%sexpecting range.size to change on %s",
ret < 0 ? "not " : "",
ret < 0 ? "failure" : "success");
} while (ret >= 0 ? range.size : save_errno == EINTR);
TEST_ASSERT(range.size == left,
"Completed with %lld bytes left, expected %" PRId64,
range.size, left);
if (left == 0)
__TEST_ASSERT_VM_VCPU_IOCTL(!ret, "KVM_PRE_FAULT_MEMORY", ret, vcpu->vm);
else
/* No memory slot causes RET_PF_EMULATE. it results in -ENOENT. */
__TEST_ASSERT_VM_VCPU_IOCTL(ret && save_errno == ENOENT,
"KVM_PRE_FAULT_MEMORY", ret, vcpu->vm);
}
static void __test_pre_fault_memory(unsigned long vm_type, bool private)
{
const struct vm_shape shape = {
.mode = VM_MODE_DEFAULT,
.type = vm_type,
};
struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vm *vm;
struct ucall uc;
uint64_t guest_test_phys_mem;
uint64_t guest_test_virt_mem;
uint64_t alignment, guest_page_size;
vm = vm_create_shape_with_one_vcpu(shape, &vcpu, guest_code);
alignment = guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size;
guest_test_phys_mem = (vm->max_gfn - TEST_NPAGES) * guest_page_size;
#ifdef __s390x__
alignment = max(0x100000UL, guest_page_size);
#else
alignment = SZ_2M;
#endif
guest_test_phys_mem = align_down(guest_test_phys_mem, alignment);
guest_test_virt_mem = guest_test_phys_mem & ((1ULL << (vm->va_bits - 1)) - 1);
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
guest_test_phys_mem, TEST_SLOT, TEST_NPAGES,
private ? KVM_MEM_GUEST_MEMFD : 0);
virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, TEST_NPAGES);
if (private)
vm_mem_set_private(vm, guest_test_phys_mem, TEST_SIZE);
pre_fault_memory(vcpu, guest_test_phys_mem, SZ_2M, 0);
pre_fault_memory(vcpu, guest_test_phys_mem + SZ_2M, PAGE_SIZE * 2, PAGE_SIZE);
pre_fault_memory(vcpu, guest_test_phys_mem + TEST_SIZE, PAGE_SIZE, PAGE_SIZE);
vcpu_args_set(vcpu, 1, guest_test_virt_mem);
vcpu_run(vcpu);
run = vcpu->run;
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Wanted KVM_EXIT_IO, got exit reason: %u (%s)",
run->exit_reason, exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
break;
case UCALL_DONE:
break;
default:
TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
break;
}
kvm_vm_free(vm);
}
static void test_pre_fault_memory(unsigned long vm_type, bool private)
{
if (vm_type && !(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(vm_type))) {
pr_info("Skipping tests for vm_type 0x%lx\n", vm_type);
return;
}
__test_pre_fault_memory(vm_type, private);
}
int main(int argc, char *argv[])
{
TEST_REQUIRE(kvm_check_cap(KVM_CAP_PRE_FAULT_MEMORY));
test_pre_fault_memory(0, false);
#ifdef __x86_64__
test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, false);
test_pre_fault_memory(KVM_X86_SW_PROTECTED_VM, true);
#endif
return 0;
}