[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH v1 03/15] libvhost-user: Bump up VHOST_USER_MAX_RAM_SLOTS to 509
From: |
David Hildenbrand |
Subject: |
[PATCH v1 03/15] libvhost-user: Bump up VHOST_USER_MAX_RAM_SLOTS to 509 |
Date: |
Fri, 2 Feb 2024 22:53:20 +0100 |
Let's support up to 509 mem slots, just like vhost in the kernel usually
does and the rust vhost-user implementation recently [1] started doing.
This is required to properly support memory hotplug, either using
multiple DIMMs (ACPI supports up to 256) or using virtio-mem.
The 509 used to be the KVM limit, it supported 512, but 3 were
used for internal purposes. Currently, KVM supports more than 512, but
it usually doesn't make use of more than ~260 (i.e., 256 DIMMs + boot
memory), except when other memory devices like PCI devices with BARs are
used. So, 509 seems to work well for vhost in the kernel.
Details can be found in the QEMU change that made virtio-mem consume
up to 256 mem slots across all virtio-mem devices. [2]
509 mem slots implies 509 VMAs/mappings in the worst case (even though,
in practice with virtio-mem we won't be seeing more than ~260 in most
setups).
With max_map_count under Linux defaulting to 64k, 509 mem slots
still correspond to less than 1% of the maximum number of mappings.
There are plenty left for the application to consume.
[1] https://github.com/rust-vmm/vhost/pull/224
[2] https://lore.kernel.org/all/20230926185738.277351-1-david@redhat.com/
Signed-off-by: David Hildenbrand <david@redhat.com>
---
subprojects/libvhost-user/libvhost-user.h | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/subprojects/libvhost-user/libvhost-user.h
b/subprojects/libvhost-user/libvhost-user.h
index c882b4e3a2..deb40e77b3 100644
--- a/subprojects/libvhost-user/libvhost-user.h
+++ b/subprojects/libvhost-user/libvhost-user.h
@@ -31,10 +31,12 @@
#define VHOST_MEMORY_BASELINE_NREGIONS 8
/*
- * Set a reasonable maximum number of ram slots, which will be supported by
- * any architecture.
+ * vhost in the kernel usually supports 509 mem slots. 509 used to be the
+ * KVM limit, it supported 512, but 3 were used for internal purposes. This
+ * limit is sufficient to support many DIMMs and virtio-mem in
+ * "dynamic-memslots" mode.
*/
-#define VHOST_USER_MAX_RAM_SLOTS 32
+#define VHOST_USER_MAX_RAM_SLOTS 509
#define VHOST_USER_HDR_SIZE offsetof(VhostUserMsg, payload.u64)
--
2.43.0
[PATCH v1 02/15] libvhost-user: Dynamically allocate memory for memory slots, David Hildenbrand, 2024/02/02
[PATCH v1 03/15] libvhost-user: Bump up VHOST_USER_MAX_RAM_SLOTS to 509,
David Hildenbrand <=
[PATCH v1 04/15] libvhost-user: Factor out removing all mem regions, David Hildenbrand, 2024/02/02
[PATCH v1 05/15] libvhost-user: Merge vu_set_mem_table_exec_postcopy() into vu_set_mem_table_exec(), David Hildenbrand, 2024/02/02
[PATCH v1 06/15] libvhost-user: Factor out adding a memory region, David Hildenbrand, 2024/02/02
[PATCH v1 08/15] libvhost-user: Don't zero out memory for memory regions, David Hildenbrand, 2024/02/02
[PATCH v1 07/15] libvhost-user: No need to check for NULL when unmapping, David Hildenbrand, 2024/02/02