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 CeCZY/ej cvK3IqKpvRIKTYA2g59jAnjQzyKj63SgKW7bMaz/qqWZHq45FArrNHaZZXEYp9AvLNB3lO3Z0uTPb17lvscU3vuK9hKxA/4J8K+K2eW/BBCk85xKYWoiZVCk+I4i3xkJSFU0jx5X6EmbiIhD/z7W+nzfdeYiPdTZCK29D/sIDlY11kiQcTQjC29aouuZNJe6rkv+1+/+5Rk95Px1IxdD3WiLNGtrZx/HkGvdqaLc1bfUVEotwB9zkaIZ+kwvmfJlCAYYbpitRVtQeQmAqTxRg1FP66uB5bXKP4sZP3ln8arnqWqZ3+m9JWLjUZWwSsAASzey+iUTnr2isaBqwd4SAQ3tsvOVWNDld0QsQvPoAyQP+RTIY7qtsHGM+kjI85qtenKZsiCLNL0Dg9R2QDt7U7Gx/iV3MmQDn5njcVx85pU1sqowqdGFw0/YarL0aFQEQijwYcRwr+haHJYg/GoyvFarsHt2aOVwya1A3lVOe8fF2fTfSw9Q6HiRVjLTekvKkGw3nLBtHOtNjTtsoBwnAyY+wWCwNTY3dvptVdbdu643mKZjqZcqsXST/j1clBZQ75ejDtizk1hO97evSAqbIkIrr3P3kCkfZELuCC1FhydENzHDv5JsDhXPAVmmXRYn/5AemRZ37ywXm/5PXOojxcvMUr5CBiTMLTpBq X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/26/2025 1:01 PM, David Hildenbrand wrote: > On 25.09.25 23:35, Sean Christopherson wrote: >> On Wed, Aug 27, 2025, Shivank Garg wrote: >>> Add tests for NUMA memory policy binding and NUMA aware allocation in >>> guest_memfd. This extends the existing selftests by adding proper >>> validation for: >>> - KVM GMEM set_policy and get_policy() vm_ops functionality using >>>    mbind() and get_mempolicy() >>> - NUMA policy application before and after memory allocation >>> >>> These tests help ensure NUMA support for guest_memfd works correctly. >>> >>> Signed-off-by: Shivank Garg >>> --- >>>   tools/testing/selftests/kvm/Makefile.kvm      |   1 + >>>   .../testing/selftests/kvm/guest_memfd_test.c  | 121 ++++++++++++++++++ >>>   2 files changed, 122 insertions(+) >>> >>> diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm >>> index 90f03f00cb04..c46cef2a7cd7 100644 >>> --- a/tools/testing/selftests/kvm/Makefile.kvm >>> +++ b/tools/testing/selftests/kvm/Makefile.kvm >>> @@ -275,6 +275,7 @@ pgste-option = $(call try-run, echo 'int main(void) { return 0; }' | \ >>>       $(CC) -Werror -Wl$(comma)--s390-pgste -x c - -o "$$TMP",-Wl$(comma)--s390-pgste) >>>     LDLIBS += -ldl >>> +LDLIBS += -lnuma >> >> Hrm, this is going to be very annoying.  I don't have libnuma-dev installed on >> any of my systems, and I doubt I'm alone.  Installing the package is >> trivial, but I'm a little wary of foisting that requirement on all KVM developers >> and build bots. >> >> I'd be especially curious what ARM and RISC-V think, as NUMA is likely a bit less >> prevelant there. > > We unconditionally use it in the mm tests for ksm and migration tests, so it's not particularly odd to require it here as well. > > What we do with liburing in mm selftests is to detect presence at compile time and essentially make the tests behave differently based on availability (see check_config.sh). > I have an alternative that drops libnuma entirely. If this approach looks reasonable, could we potentially factor these out into a common test utility for other selftests that currently depend on libnuma? What are your thoughts on this? diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index c46cef2a7cd7..90f03f00cb04 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -275,7 +275,6 @@ pgste-option = $(call try-run, echo 'int main(void) { return 0; }' | \ $(CC) -Werror -Wl$(comma)--s390-pgste -x c - -o "$$TMP",-Wl$(comma)--s390-pgste) LDLIBS += -ldl -LDLIBS += -lnuma LDFLAGS += -pthread $(no-pie-option) $(pgste-option) LIBKVM_C := $(filter %.c,$(LIBKVM)) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 9640d04ec293..12ce91950c44 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -7,8 +7,6 @@ #include #include #include -#include -#include #include #include #include @@ -75,9 +73,6 @@ static void test_mmap_supported(int fd, size_t page_size, size_t total_size) TEST_ASSERT(!ret, "munmap() should succeed."); } -#define TEST_REQUIRE_NUMA_MULTIPLE_NODES() \ - TEST_REQUIRE(numa_available() != -1 && numa_max_node() >= 1) - static void test_mbind(int fd, size_t page_size, size_t total_size) { unsigned long nodemask = 1; /* nid: 0 */ @@ -87,7 +82,8 @@ static void test_mbind(int fd, size_t page_size, size_t total_size) char *mem; int ret; - TEST_REQUIRE_NUMA_MULTIPLE_NODES(); + if (!is_multi_numa_node_system()) + return; mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); TEST_ASSERT(mem != MAP_FAILED, "mmap for mbind test should succeed"); @@ -136,7 +132,8 @@ static void test_numa_allocation(int fd, size_t page_size, size_t total_size) char *mem; int ret, i; - TEST_REQUIRE_NUMA_MULTIPLE_NODES(); + if (!is_multi_numa_node_system()) + return; /* Clean slate: deallocate all file space, if any */ ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, total_size); diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 23a506d7eca3..ba4c316f4fef 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -12,6 +12,7 @@ #include "linux/list.h" #include #include +#include #include "linux/rbtree.h" #include @@ -20,6 +21,7 @@ #include #include +#include #include @@ -633,6 +635,50 @@ static inline bool is_smt_on(void) return false; } +#include +static int numa_max_node(void) +{ + DIR *d; + struct dirent *de; + int max_node = 0; + + d = opendir("/sys/devices/system/node"); + if (!d) { + /* No NUMA support or no nodes found, assume single node */ + return 0; + } + + while ((de = readdir(d)) != NULL) { + int node_id; + char *endptr; + + if (strncmp(de->d_name, "node", 4) != 0) + continue; + + node_id = strtol(de->d_name + 4, &endptr, 10); + if (*endptr != '\0') + continue; + + if (node_id > max_node) + max_node = node_id; + } + closedir(d); + + return max_node; +} + +static int numa_available(void) +{ + if (syscall(__NR_get_mempolicy, NULL, NULL, 0, 0, 0) < 0 && (errno == ENOSYS || errno == EPERM)) + return -1; + return 0; +} + +static inline bool is_multi_numa_node_system(void) +{ + return numa_available() != -1 && numa_max_node() >= 1; +} + void vm_create_irqchip(struct kvm_vm *vm); static inline int __vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size,