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selftests: kvm: Add testcase for creating max number of memslots 

This patch introduces test_add_max_memory_regions(), which checks
that a VM can have added memory slots up to the limit defined in
KVM_CAP_NR_MEMSLOTS. Then attempt to add one more slot to
verify it fails as expected.

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200410231707.7128-11-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wainer dos Santos Moschetta 2020-04-10 16:17:07 -07:00 committed by Paolo Bonzini
parent 5b4f758f45
commit 909e0abaac
1 changed files with 61 additions and 4 deletions
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65
tools/testing/selftests/kvm/set_memory_region_test.c
View File

@ -9,6 +9,7 @@
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/compiler.h>
@ -18,14 +19,18 @@
#define VCPU_ID 0
/*
* s390x needs at least 1MB alignment, and the x86_64 MOVE/DELETE tests need a
* 2MB sized and aligned region so that the initial region corresponds to
* exactly one large page.
*/
#define MEM_REGION_SIZE 0x200000
#ifdef __x86_64__
/*
* Somewhat arbitrary location and slot, intended to not overlap anything. The
* location and size are specifically 2mb sized/aligned so that the initial
* region corresponds to exactly one large page.
* Somewhat arbitrary location and slot, intended to not overlap anything.
*/
#define MEM_REGION_GPA 0xc0000000
#define MEM_REGION_SIZE 0x200000
#define MEM_REGION_SLOT 10
static const uint64_t MMIO_VAL = 0xbeefull;
@ -312,6 +317,54 @@ static void test_zero_memory_regions(void)
}
#endif /* __x86_64__ */
/*
* Test it can be added memory slots up to KVM_CAP_NR_MEMSLOTS, then any
* tentative to add further slots should fail.
*/
static void test_add_max_memory_regions(void)
{
int ret;
struct kvm_vm *vm;
uint32_t max_mem_slots;
uint32_t slot;
uint64_t guest_addr = 0x0;
uint64_t mem_reg_npages;
void *mem;
max_mem_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS);
TEST_ASSERT(max_mem_slots > 0,
"KVM_CAP_NR_MEMSLOTS should be greater than 0");
pr_info("Allowed number of memory slots: %i\n", max_mem_slots);
vm = vm_create(VM_MODE_DEFAULT, 0, O_RDWR);
mem_reg_npages = vm_calc_num_guest_pages(VM_MODE_DEFAULT, MEM_REGION_SIZE);
/* Check it can be added memory slots up to the maximum allowed */
pr_info("Adding slots 0..%i, each memory region with %dK size\n",
(max_mem_slots - 1), MEM_REGION_SIZE >> 10);
for (slot = 0; slot < max_mem_slots; slot++) {
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
guest_addr, slot, mem_reg_npages,
0);
guest_addr += MEM_REGION_SIZE;
}
/* Check it cannot be added memory slots beyond the limit */
mem = mmap(NULL, MEM_REGION_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() host");
ret = ioctl(vm_get_fd(vm), KVM_SET_USER_MEMORY_REGION,
&(struct kvm_userspace_memory_region) {slot, 0, guest_addr,
MEM_REGION_SIZE, (uint64_t) mem});
TEST_ASSERT(ret == -1 && errno == EINVAL,
"Adding one more memory slot should fail with EINVAL");
munmap(mem, MEM_REGION_SIZE);
kvm_vm_free(vm);
}
int main(int argc, char *argv[])
{
#ifdef __x86_64__
@ -327,7 +380,11 @@ int main(int argc, char *argv[])
* KVM_RUN fails with ENOEXEC or EFAULT.
*/
test_zero_memory_regions();
#endif
test_add_max_memory_regions();
#ifdef __x86_64__
if (argc > 1)
loops = atoi(argv[1]);
else