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KVM: selftests: Limit dirty_log_test's s390x workaround to s390x

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s390 specific workaround causes the dirty-log mode of the test to dirty
all guest memory on the first iteration, which is very slow when the test
is run in a nested VM.

Limit this workaround to s390x.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20250111003004.1235645-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Maxim Levitsky 2025-01-10 16:29:52 -08:00 committed by Sean Christopherson
parent 9b1feec83e
commit deb8b8400e
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/kvm/dirty_log_test.c
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@ -98,6 +98,7 @@ static void guest_code(void)
uint64_t addr;
int i;
#ifdef __s390x__
/*
* On s390x, all pages of a 1M segment are initially marked as dirty
* when a page of the segment is written to for the very first time.
@ -108,6 +109,7 @@ static void guest_code(void)
addr = guest_test_virt_mem + i * guest_page_size;
vcpu_arch_put_guest(*(uint64_t *)addr, READ_ONCE(iteration));
}
#endif
while (true) {
for (i = 0; i < TEST_PAGES_PER_LOOP; i++) {