From: Maciej S. Szmigiero Date: Wed, 2 Dec 2020 20:35:36 +0000 (+0100) Subject: selftests: kvm/set_memory_region_test: Fix race in move region test X-Git-Tag: v5.10.7~1011^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0c55f867f0c96dff93d4e0b5973975d65afb26d8;p=platform%2Fkernel%2Flinux-rpi.git selftests: kvm/set_memory_region_test: Fix race in move region test The current memory region move test correctly handles the situation that the second (realigning) memslot move operation would temporarily trigger MMIO until it completes, however it does not handle the case in which the first (misaligning) move operation does this, too. This results in false test assertions in case it does so. Fix this by handling temporary MMIO from the first memslot move operation in the test guest code, too. Fixes: 8a0639fe9201 ("KVM: sefltests: Add explicit synchronization to move mem region test") Signed-off-by: Maciej S. Szmigiero Message-Id: <0fdddb94bb0e31b7da129a809a308d91c10c0b5e.1606941224.git.maciej.szmigiero@oracle.com> Signed-off-by: Paolo Bonzini --- diff --git a/tools/testing/selftests/kvm/set_memory_region_test.c b/tools/testing/selftests/kvm/set_memory_region_test.c index b3ece55..6f441dd 100644 --- a/tools/testing/selftests/kvm/set_memory_region_test.c +++ b/tools/testing/selftests/kvm/set_memory_region_test.c @@ -156,14 +156,23 @@ static void guest_code_move_memory_region(void) GUEST_SYNC(0); /* - * Spin until the memory region is moved to a misaligned address. This - * may or may not trigger MMIO, as the window where the memslot is - * invalid is quite small. + * Spin until the memory region starts getting moved to a + * misaligned address. + * Every region move may or may not trigger MMIO, as the + * window where the memslot is invalid is usually quite small. */ val = guest_spin_on_val(0); GUEST_ASSERT_1(val == 1 || val == MMIO_VAL, val); - /* Spin until the memory region is realigned. */ + /* Spin until the misaligning memory region move completes. */ + val = guest_spin_on_val(MMIO_VAL); + GUEST_ASSERT_1(val == 1 || val == 0, val); + + /* Spin until the memory region starts to get re-aligned. */ + val = guest_spin_on_val(0); + GUEST_ASSERT_1(val == 1 || val == MMIO_VAL, val); + + /* Spin until the re-aligning memory region move completes. */ val = guest_spin_on_val(MMIO_VAL); GUEST_ASSERT_1(val == 1, val);