This is a note to let you know that I've just added the patch titled KVM: selftests: Fix number of pages for memory slot in memslot_modification_stress_test to the 6.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-selftests-fix-number-of-pages-for-memory-slot-in.patch and it can be found in the queue-6.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit ec3e73e60c7dbd9244bf4e7c4a9f094beae36ca4 Author: Gavin Shan <gshan@xxxxxxxxxx> Date: Thu Oct 13 14:30:20 2022 +0800 KVM: selftests: Fix number of pages for memory slot in memslot_modification_stress_test [ Upstream commit 05c2224d4b049406b0545a10be05280ff4b8ba0a ] It's required by vm_userspace_mem_region_add() that memory size should be aligned to host page size. However, one guest page is provided by memslot_modification_stress_test. It triggers failure in the scenario of 64KB-page-size-host and 4KB-page-size-guest, as the following messages indicate. # ./memslot_modification_stress_test Testing guest mode: PA-bits:40, VA-bits:48, 4K pages guest physical test memory: [0xffbfff0000, 0xffffff0000) Finished creating vCPUs Started all vCPUs ==== Test Assertion Failure ==== lib/kvm_util.c:824: vm_adjust_num_guest_pages(vm->mode, npages) == npages pid=5712 tid=5712 errno=0 - Success 1 0x0000000000404eeb: vm_userspace_mem_region_add at kvm_util.c:822 2 0x0000000000401a5b: add_remove_memslot at memslot_modification_stress_test.c:82 3 (inlined by) run_test at memslot_modification_stress_test.c:110 4 0x0000000000402417: for_each_guest_mode at guest_modes.c:100 5 0x00000000004016a7: main at memslot_modification_stress_test.c:187 6 0x0000ffffb8cd4383: ?? ??:0 7 0x0000000000401827: _start at :? Number of guest pages is not compatible with the host. Try npages=16 Fix the issue by providing 16 guest pages to the memory slot for this particular combination of 64KB-page-size-host and 4KB-page-size-guest on aarch64. Fixes: ef4c9f4f65462 ("KVM: selftests: Fix 32-bit truncation of vm_get_max_gfn()") Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Link: https://lore.kernel.org/r/20221013063020.201856-1-gshan@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/tools/testing/selftests/kvm/memslot_modification_stress_test.c b/tools/testing/selftests/kvm/memslot_modification_stress_test.c index 6ee7e1dde404..bb1d17a1171b 100644 --- a/tools/testing/selftests/kvm/memslot_modification_stress_test.c +++ b/tools/testing/selftests/kvm/memslot_modification_stress_test.c @@ -67,7 +67,7 @@ struct memslot_antagonist_args { static void add_remove_memslot(struct kvm_vm *vm, useconds_t delay, uint64_t nr_modifications) { - const uint64_t pages = 1; + uint64_t pages = max_t(int, vm->page_size, getpagesize()) / vm->page_size; uint64_t gpa; int i;