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To: david@redhat.com, kvm@vger.kernel.org, qemu-devel@nongnu.org,
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Cc: william.roche@oracle.com, peterx@redhat.com, pbonzini@redhat.com,
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wangyanan55@huawei.com, zhao1.liu@intel.com, joao.m.martins@oracle.com
Subject: [PATCH v7 5/6] hostmem: Factor out applying settings
Date: Sat, 1 Feb 2025 09:57:25 +0000
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From: David Hildenbrand <david@redhat.com>
We want to reuse the functionality when remapping RAM.
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: William Roche <william.roche@oracle.com>
---
backends/hostmem.c | 155 ++++++++++++++++++++++++---------------------
1 file changed, 82 insertions(+), 73 deletions(-)
diff --git a/backends/hostmem.c b/backends/hostmem.c
index bceca1a8d9..46d80f98b4 100644
--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -36,6 +36,87 @@ QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_BIND !=3D MPOL_BIND);
QEMU_BUILD_BUG_ON(HOST_MEM_POLICY_INTERLEAVE !=3D MPOL_INTERLEAVE);
#endif
=20
+static void host_memory_backend_apply_settings(HostMemoryBackend *backend,
+ void *ptr, uint64_t size,
+ Error **errp)
+{
+ bool async =3D !phase_check(PHASE_LATE_BACKENDS_CREATED);
+
+ if (backend->merge) {
+ qemu_madvise(ptr, size, QEMU_MADV_MERGEABLE);
+ }
+ if (!backend->dump) {
+ qemu_madvise(ptr, size, QEMU_MADV_DONTDUMP);
+ }
+#ifdef CONFIG_NUMA
+ unsigned long lastbit =3D find_last_bit(backend->host_nodes, MAX_NODES=
);
+ /* lastbit =3D=3D MAX_NODES means maxnode =3D 0 */
+ unsigned long maxnode =3D (lastbit + 1) % (MAX_NODES + 1);
+ /*
+ * Ensure policy won't be ignored in case memory is preallocated
+ * before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
+ * this doesn't catch hugepage case.
+ */
+ unsigned flags =3D MPOL_MF_STRICT | MPOL_MF_MOVE;
+ int mode =3D backend->policy;
+
+ /*
+ * Check for invalid host-nodes and policies and give more verbose
+ * error messages than mbind().
+ */
+ if (maxnode && backend->policy =3D=3D MPOL_DEFAULT) {
+ error_setg(errp, "host-nodes must be empty for policy default,"
+ " or you should explicitly specify a policy other"
+ " than default");
+ return;
+ } else if (maxnode =3D=3D 0 && backend->policy !=3D MPOL_DEFAULT) {
+ error_setg(errp, "host-nodes must be set for policy %s",
+ HostMemPolicy_str(backend->policy));
+ return;
+ }
+
+ /*
+ * We can have up to MAX_NODES nodes, but we need to pass maxnode+1
+ * as argument to mbind() due to an old Linux bug (feature?) which
+ * cuts off the last specified node. This means backend->host_nodes
+ * must have MAX_NODES+1 bits available.
+ */
+ assert(sizeof(backend->host_nodes) >=3D
+ BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
+ assert(maxnode <=3D MAX_NODES);
+
+#ifdef HAVE_NUMA_HAS_PREFERRED_MANY
+ if (mode =3D=3D MPOL_PREFERRED && numa_has_preferred_many() > 0) {
+ /*
+ * Replace with MPOL_PREFERRED_MANY otherwise the mbind() below
+ * silently picks the first node.
+ */
+ mode =3D MPOL_PREFERRED_MANY;
+ }
+#endif
+
+ if (maxnode &&
+ mbind(ptr, size, mode, backend->host_nodes, maxnode + 1, flags)) {
+ if (backend->policy !=3D MPOL_DEFAULT || errno !=3D ENOSYS) {
+ error_setg_errno(errp, errno,
+ "cannot bind memory to host NUMA nodes");
+ return;
+ }
+ }
+#endif
+ /*
+ * Preallocate memory after the NUMA policy has been instantiated.
+ * This is necessary to guarantee memory is allocated with
+ * specified NUMA policy in place.
+ */
+ if (backend->prealloc &&
+ !qemu_prealloc_mem(memory_region_get_fd(&backend->mr),
+ ptr, size, backend->prealloc_threads,
+ backend->prealloc_context, async, errp)) {
+ return;
+ }
+}
+
char *
host_memory_backend_get_name(HostMemoryBackend *backend)
{
@@ -337,7 +418,6 @@ host_memory_backend_memory_complete(UserCreatable *uc, =
Error **errp)
void *ptr;
uint64_t sz;
size_t pagesize;
- bool async =3D !phase_check(PHASE_LATE_BACKENDS_CREATED);
=20
if (!bc->alloc) {
return;
@@ -357,78 +437,7 @@ host_memory_backend_memory_complete(UserCreatable *uc,=
Error **errp)
return;
}
=20
- if (backend->merge) {
- qemu_madvise(ptr, sz, QEMU_MADV_MERGEABLE);
- }
- if (!backend->dump) {
- qemu_madvise(ptr, sz, QEMU_MADV_DONTDUMP);
- }
-#ifdef CONFIG_NUMA
- unsigned long lastbit =3D find_last_bit(backend->host_nodes, MAX_NODES=
);
- /* lastbit =3D=3D MAX_NODES means maxnode =3D 0 */
- unsigned long maxnode =3D (lastbit + 1) % (MAX_NODES + 1);
- /*
- * Ensure policy won't be ignored in case memory is preallocated
- * before mbind(). note: MPOL_MF_STRICT is ignored on hugepages so
- * this doesn't catch hugepage case.
- */
- unsigned flags =3D MPOL_MF_STRICT | MPOL_MF_MOVE;
- int mode =3D backend->policy;
-
- /* check for invalid host-nodes and policies and give more verbose
- * error messages than mbind(). */
- if (maxnode && backend->policy =3D=3D MPOL_DEFAULT) {
- error_setg(errp, "host-nodes must be empty for policy default,"
- " or you should explicitly specify a policy other"
- " than default");
- return;
- } else if (maxnode =3D=3D 0 && backend->policy !=3D MPOL_DEFAULT) {
- error_setg(errp, "host-nodes must be set for policy %s",
- HostMemPolicy_str(backend->policy));
- return;
- }
-
- /*
- * We can have up to MAX_NODES nodes, but we need to pass maxnode+1
- * as argument to mbind() due to an old Linux bug (feature?) which
- * cuts off the last specified node. This means backend->host_nodes
- * must have MAX_NODES+1 bits available.
- */
- assert(sizeof(backend->host_nodes) >=3D
- BITS_TO_LONGS(MAX_NODES + 1) * sizeof(unsigned long));
- assert(maxnode <=3D MAX_NODES);
-
-#ifdef HAVE_NUMA_HAS_PREFERRED_MANY
- if (mode =3D=3D MPOL_PREFERRED && numa_has_preferred_many() > 0) {
- /*
- * Replace with MPOL_PREFERRED_MANY otherwise the mbind() below
- * silently picks the first node.
- */
- mode =3D MPOL_PREFERRED_MANY;
- }
-#endif
-
- if (maxnode &&
- mbind(ptr, sz, mode, backend->host_nodes, maxnode + 1, flags)) {
- if (backend->policy !=3D MPOL_DEFAULT || errno !=3D ENOSYS) {
- error_setg_errno(errp, errno,
- "cannot bind memory to host NUMA nodes");
- return;
- }
- }
-#endif
- /*
- * Preallocate memory after the NUMA policy has been instantiated.
- * This is necessary to guarantee memory is allocated with
- * specified NUMA policy in place.
- */
- if (backend->prealloc && !qemu_prealloc_mem(memory_region_get_fd(&back=
end->mr),
- ptr, sz,
- backend->prealloc_threads,
- backend->prealloc_context,
- async, errp)) {
- return;
- }
+ host_memory_backend_apply_settings(backend, ptr, sz, errp);
}
=20
static bool
--=20
2.43.5