[PATCH v12 08/12] KVM: selftests: Add additional equivalents to libnuma APIs in KVM's numaif.h

Sean Christopherson
2025-10-07T22:14:51Z

Add APIs for all syscalls defined in the kernel's mm/mempolicy.c to match
those that would be provided by linking to libnuma. Opportunistically use
the recently inroduced KVM_SYSCALL_DEFINE() builders to take care of the
boilderplate, and to fix a flaw where the two existing wrappers would
generate multiple symbols if numaif.h were to be included multiple times.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/include/numaif.h | 36 +++++++++++--------
.../selftests/kvm/x86/xapic_ipi_test.c | 5 ++-
2 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/numaif.h b/tools/testing/selftests/kvm/include/numaif.h
index b020547403fd..aaa4ac174890 100644
--- a/tools/testing/selftests/kvm/include/numaif.h
+++ b/tools/testing/selftests/kvm/include/numaif.h
@@ -13,23 +13,29 @@
#ifndef SELFTEST_KVM_NUMAIF_H
#define SELFTEST_KVM_NUMAIF_H

-#define __NR_get_mempolicy 239
-#define __NR_migrate_pages 256
+#include <linux/mempolicy.h>

-/* System calls */
-long get_mempolicy(int *policy, const unsigned long *nmask,
- unsigned long maxnode, void *addr, int flags)
-{
- return syscall(__NR_get_mempolicy, policy, nmask,
- maxnode, addr, flags);
-}
+#include "kvm_syscalls.h"

-long migrate_pages(int pid, unsigned long maxnode,
- const unsigned long *frommask,
- const unsigned long *tomask)
-{
- return syscall(__NR_migrate_pages, pid, maxnode, frommask, tomask);
-}
+KVM_SYSCALL_DEFINE(get_mempolicy, 5, int *, policy, const unsigned long *, nmask,
+ unsigned long, maxnode, void *, addr, int, flags);
+
+KVM_SYSCALL_DEFINE(set_mempolicy, 3, int, mode, const unsigned long *, nmask,
+ unsigned long, maxnode);
+
+KVM_SYSCALL_DEFINE(set_mempolicy_home_node, 4, unsigned long, start,
+ unsigned long, len, unsigned long, home_node,
+ unsigned long, flags);
+
+KVM_SYSCALL_DEFINE(migrate_pages, 4, int, pid, unsigned long, maxnode,
+ const unsigned long *, frommask, const unsigned long *, tomask);
+
+KVM_SYSCALL_DEFINE(move_pages, 6, int, pid, unsigned long, count, void *, pages,
+ const int *, nodes, int *, status, int, flags);
+
+KVM_SYSCALL_DEFINE(mbind, 6, void *, addr, unsigned long, size, int, mode,
+ const unsigned long *, nodemask, unsigned long, maxnode,
+ unsigned int, flags);

/* Policies */
#define MPOL_DEFAULT 0
diff --git a/tools/testing/selftests/kvm/x86/xapic_ipi_test.c b/tools/testing/selftests/kvm/x86/xapic_ipi_test.c
index 35cb9de54a82..ae4a4b6c05ca 100644
--- a/tools/testing/selftests/kvm/x86/xapic_ipi_test.c
+++ b/tools/testing/selftests/kvm/x86/xapic_ipi_test.c
@@ -256,7 +256,7 @@ void do_migrations(struct test_data_page *data, int run_secs, int delay_usecs,
int nodes = 0;
time_t start_time, last_update, now;
time_t interval_secs = 1;
- int i, r;
+ int i;
int from, to;
unsigned long bit;
uint64_t hlt_count;
@@ -267,9 +267,8 @@ void do_migrations(struct test_data_page *data, int run_secs, int delay_usecs,
delay_usecs);

/* Get set of first 64 numa nodes available */
- r = get_mempolicy(NULL, &nodemask, sizeof(nodemask) * 8,
+ kvm_get_mempolicy(NULL, &nodemask, sizeof(nodemask) * 8,
0, MPOL_F_MEMS_ALLOWED);
- TEST_ASSERT(r == 0, "get_mempolicy failed errno=%d", errno);

fprintf(stderr, "Numa nodes found amongst first %lu possible nodes "
"(each 1-bit indicates node is present): %#lx\n",
--
2.51.0.710.ga91ca5db03-goog