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KVM: selftests: Fix divide-by-zero bug in memslot_perf_test 

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: a69170c65a ("KVM: selftests: memslot_perf_test: Report optimal memory slots")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221213001653.3852042-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-12-13 00:16:42 +00:00 committed by Paolo Bonzini
parent 73441efa36
commit d61a12cb9a
1 changed files with 3 additions and 0 deletions
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3
tools/testing/selftests/kvm/memslot_perf_test.c
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@ -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))