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KVM: selftests: Add a read-only mprotect() phase to mmu_stress_test

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Add a third phase of mmu_stress_test to verify that mprotect()ing guest
memory to make it read-only doesn't cause explosions, e.g. to verify KVM
correctly handles the resulting mmu_notifier invalidations.

Reviewed-by: James Houghton <jthoughton@google.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20241128005547.4077116-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-11-27 16:55:43 -08:00
parent 82b542e118
commit 80b7859a3a
1 changed files with 18 additions and 4 deletions
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22
tools/testing/selftests/kvm/mmu_stress_test.c
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@ -28,6 +28,10 @@ static void guest_code(uint64_t start_gpa, uint64_t end_gpa, uint64_t stride)
GUEST_SYNC(i);
}
for (gpa = start_gpa; gpa < end_gpa; gpa += stride)
*((volatile uint64_t *)gpa);
GUEST_SYNC(2);
GUEST_ASSERT(0);
}
@ -95,6 +99,10 @@ static void *vcpu_worker(void *data)
run_vcpu(vcpu, 1);
rendezvous_with_boss();
/* Stage 2, read all of guest memory, which is now read-only. */
run_vcpu(vcpu, 2);
rendezvous_with_boss();
return NULL;
}
@ -175,7 +183,7 @@ int main(int argc, char *argv[])
const uint64_t start_gpa = SZ_4G;
const int first_slot = 1;
struct timespec time_start, time_run1, time_reset, time_run2;
struct timespec time_start, time_run1, time_reset, time_run2, time_ro;
uint64_t max_gpa, gpa, slot_size, max_mem, i;
int max_slots, slot, opt, fd;
bool hugepages = false;
@ -279,14 +287,20 @@ int main(int argc, char *argv[])
rendezvous_with_vcpus(&time_reset, "reset");
rendezvous_with_vcpus(&time_run2, "run 2");
mprotect(mem, slot_size, PROT_READ);
rendezvous_with_vcpus(&time_ro, "mprotect RO");
time_ro = timespec_sub(time_ro, time_run2);
time_run2 = timespec_sub(time_run2, time_reset);
time_reset = timespec_sub(time_reset, time_run1);
time_reset = timespec_sub(time_reset, time_run1);
time_run1 = timespec_sub(time_run1, time_start);
pr_info("run1 = %ld.%.9lds, reset = %ld.%.9lds, run2 = %ld.%.9lds\n",
pr_info("run1 = %ld.%.9lds, reset = %ld.%.9lds, run2 = %ld.%.9lds, "
"ro = %ld.%.9lds\n",
time_run1.tv_sec, time_run1.tv_nsec,
time_reset.tv_sec, time_reset.tv_nsec,
time_run2.tv_sec, time_run2.tv_nsec);
time_run2.tv_sec, time_run2.tv_nsec,
time_ro.tv_sec, time_ro.tv_nsec);
/*
* Delete even numbered slots (arbitrary) and unmap the first half of