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KVM: selftests: Speed up set_memory_region_test

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After commit 4fc096a99e ("KVM: Raise the maximum number of user memslots")
set_memory_region_test may take too long, reports are that the default
timeout value we have (120s) may not be enough even on a physical host.

Speed things up a bit by throwing away vm_userspace_mem_region_add() usage
from test_add_max_memory_regions(), we don't really need to do the majority
of the stuff it does for the sake of this test.

On my AMD EPYC 7401P, # time ./set_memory_region_test
pre-patch:
 Testing KVM_RUN with zero added memory regions
 Allowed number of memory slots: 32764
 Adding slots 0..32763, each memory region with 2048K size
 Testing MOVE of in-use region, 10 loops
 Testing DELETE of in-use region, 10 loops

 real	0m44.917s
 user	0m7.416s
 sys	0m34.601s

post-patch:
 Testing KVM_RUN with zero added memory regions
 Allowed number of memory slots: 32764
 Adding slots 0..32763, each memory region with 2048K size
 Testing MOVE of in-use region, 10 loops
 Testing DELETE of in-use region, 10 loops

 real	0m20.714s
 user	0m0.109s
 sys	0m18.359s

Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210426130121.758229-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-04-26 15:01:21 +02:00 committed by Paolo Bonzini
parent d4787579d2
commit 3bf0fcd754
1 changed files with 45 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
tools/testing/selftests/kvm/set_memory_region_test.c
View File

@ -329,6 +329,22 @@ static void test_zero_memory_regions(void)
}
#endif /* __x86_64__ */
static int test_memory_region_add(struct kvm_vm *vm, void *mem, uint32_t slot,
uint32_t size, uint64_t guest_addr)
{
struct kvm_userspace_memory_region region;
int ret;
region.slot = slot;
region.flags = 0;
region.guest_phys_addr = guest_addr;
region.memory_size = size;
region.userspace_addr = (uintptr_t) mem;
ret = ioctl(vm_get_fd(vm), KVM_SET_USER_MEMORY_REGION, &region);
return ret;
}
/*
* Test it can be added memory slots up to KVM_CAP_NR_MEMSLOTS, then any
* tentative to add further slots should fail.
@ -339,9 +355,15 @@ static void test_add_max_memory_regions(void)
struct kvm_vm *vm;
uint32_t max_mem_slots;
uint32_t slot;
uint64_t guest_addr = 0x0;
uint64_t mem_reg_npages;
void *mem;
void *mem, *mem_aligned, *mem_extra;
size_t alignment;
#ifdef __s390x__
/* On s390x, the host address must be aligned to 1M (due to PGSTEs) */
alignment = 0x100000;
#else
alignment = 1;
#endif
max_mem_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS);
TEST_ASSERT(max_mem_slots > 0,
@ -350,30 +372,37 @@ static void test_add_max_memory_regions(void)
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);
mem = mmap(NULL, MEM_REGION_SIZE * max_mem_slots + alignment,
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() host");
mem_aligned = (void *)(((size_t) mem + alignment - 1) & ~(alignment - 1));
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;
ret = test_memory_region_add(vm, mem_aligned +
((uint64_t)slot * MEM_REGION_SIZE),
slot, MEM_REGION_SIZE,
(uint64_t)slot * MEM_REGION_SIZE);
TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed,\n"
" rc: %i errno: %i slot: %i\n",
ret, errno, slot);
}
/* 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");
mem_extra = mmap(NULL, MEM_REGION_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
TEST_ASSERT(mem_extra != 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});
ret = test_memory_region_add(vm, mem_extra, max_mem_slots, MEM_REGION_SIZE,
(uint64_t)max_mem_slots * MEM_REGION_SIZE);
TEST_ASSERT(ret == -1 && errno == EINVAL,
"Adding one more memory slot should fail with EINVAL");
munmap(mem, MEM_REGION_SIZE);
munmap(mem, MEM_REGION_SIZE * max_mem_slots + alignment);
munmap(mem_extra, MEM_REGION_SIZE);
kvm_vm_free(vm);
}