Check that the number of pages per slot is non-zero in get_max_slots()
prior to computing the remaining number of pages. clang generates code
that uses an actual DIV for calculating the remaining, which causes a #DE
if the total number of pages is less than the number of slots.
traps: memslot_perf_te[97611] trap divide error ip:4030c4 sp:7ffd18ae58f0
error:0 in memslot_perf_test[401000+cb000]
Fixes: a69170c65acd ("KVM: selftests: memslot_perf_test: Report optimal memory
slots")
Signed-off-by: Sean Christopherson
---
tools/testing/selftests/kvm/memslot_perf_test.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c
b/tools/testing/selftests/kvm/memslot_perf_test.c
index e698306bf49d..e6587e193490 100644
--- a/tools/testing/selftests/kvm/memslot_perf_test.c
+++ b/tools/testing/selftests/kvm/memslot_perf_test.c
@@ -265,6 +265,9 @@ static uint64_t get_max_slots(struct vm_data *data,
uint32_t host_page_size)
slots = data->nslots;
while (--slots > 1) {
pages_per_slot = mempages / slots;
+ if (!pages_per_slot)
+ continue;
+
rempages = mempages % pages_per_slot;
if (check_slot_pages(host_page_size, guest_page_size,
pages_per_slot, rempages))
--
2.39.0.rc1.256.g54fd8350bd-goog
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