iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: selftests: Add "delete" testcase to set_memory_region_test

Browse Source 
Add a testcase for deleting memslots while the guest is running.
Like the "move" testcase, this is x86_64-only as it relies on MMIO
happening when a non-existent memslot is encountered.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200410231707.7128-7-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-04-10 16:17:03 -07:00 committed by Paolo Bonzini
parent 8a0639fe92
commit 8fb38f05ca
1 changed files with 91 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

91
tools/testing/selftests/kvm/x86_64/set_memory_region_test.c
View File

@ -29,6 +29,9 @@
static const uint64_t MMIO_VAL = 0xbeefull;
extern const uint64_t final_rip_start;
extern const uint64_t final_rip_end;
static sem_t vcpu_ready;
static inline uint64_t guest_spin_on_val(uint64_t spin_val)
@ -203,6 +206,89 @@ static void test_move_memory_region(void)
kvm_vm_free(vm);
}
static void guest_code_delete_memory_region(void)
{
uint64_t val;
GUEST_SYNC(0);
/* Spin until the memory region is deleted. */
val = guest_spin_on_val(0);
GUEST_ASSERT_1(val == MMIO_VAL, val);
/* Spin until the memory region is recreated. */
val = guest_spin_on_val(MMIO_VAL);
GUEST_ASSERT_1(val == 0, val);
/* Spin until the memory region is deleted. */
val = guest_spin_on_val(0);
GUEST_ASSERT_1(val == MMIO_VAL, val);
asm("1:\n\t"
".pushsection .rodata\n\t"
".global final_rip_start\n\t"
"final_rip_start: .quad 1b\n\t"
".popsection");
/* Spin indefinitely (until the code memslot is deleted). */
guest_spin_on_val(MMIO_VAL);
asm("1:\n\t"
".pushsection .rodata\n\t"
".global final_rip_end\n\t"
"final_rip_end: .quad 1b\n\t"
".popsection");
GUEST_ASSERT_1(0, 0);
}
static void test_delete_memory_region(void)
{
pthread_t vcpu_thread;
struct kvm_regs regs;
struct kvm_run *run;
struct kvm_vm *vm;
vm = spawn_vm(&vcpu_thread, guest_code_delete_memory_region);
/* Delete the memory region, the guest should not die. */
vm_mem_region_delete(vm, MEM_REGION_SLOT);
wait_for_vcpu();
/* Recreate the memory region. The guest should see "0". */
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS_THP,
MEM_REGION_GPA, MEM_REGION_SLOT,
MEM_REGION_SIZE / getpagesize(), 0);
wait_for_vcpu();
/* Delete the region again so that there's only one memslot left. */
vm_mem_region_delete(vm, MEM_REGION_SLOT);
wait_for_vcpu();
/*
* Delete the primary memslot. This should cause an emulation error or
* shutdown due to the page tables getting nuked.
*/
vm_mem_region_delete(vm, 0);
pthread_join(vcpu_thread, NULL);
run = vcpu_state(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN ||
run->exit_reason == KVM_EXIT_INTERNAL_ERROR,
"Unexpected exit reason = %d", run->exit_reason);
vcpu_regs_get(vm, VCPU_ID, &regs);
TEST_ASSERT(regs.rip >= final_rip_start &&
regs.rip < final_rip_end,
"Bad rip, expected 0x%lx - 0x%lx, got 0x%llx\n",
final_rip_start, final_rip_end, regs.rip);
kvm_vm_free(vm);
}
int main(int argc, char *argv[])
{
int i, loops;
@ -215,8 +301,13 @@ int main(int argc, char *argv[])
else
loops = 10;
pr_info("Testing MOVE of in-use region, %d loops\n", loops);
for (i = 0; i < loops; i++)
test_move_memory_region();
pr_info("Testing DELETE of in-use region, %d loops\n", loops);
for (i = 0; i < loops; i++)
test_delete_memory_region();
return 0;
}