Repository navigation
Backport #41 to 6.18-lts: xen/unpopulated-alloc: do not carve a region for a single node's pool - #43
Merged
Merged
Conversation
A node whose pool is short called fill_list() even when other nodes still held free pages. fill_list() takes new address space from iomem_resource, which on a PVH dom0 can overlap MMIO that Xen has identity mapped. A later grant map onto such a gfn makes Xen refuse the p2m change and crash dom0. Carve a new region only when every node's pool is short, and otherwise take pages from the preferred node first, then the others. Return pages to the pool of their own node when the PV p2m allocation fails. (cherry picked from commit a071d85)
…ode variant Borrowing across nodes made xen_alloc_unpopulated_pages_node() best effort, so a caller that asked for a node could get pages of another. The node variant now takes pages only from the requested node's pool and fails with -ENOMEM when it is short. It no longer carves a region. xen_alloc_unpopulated_pages() has no node requirement: it prefers the local pool, borrows from other nodes, and carves a region only when every pool is short. xenbus falls back to it when the node's pool is short, and gnttab_alloc_pages_node() uses it for NUMA_NO_NODE. (cherry picked from commit fc166a6)
azenla
approved these changes
Oct 19, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Backport of #41 from
edera/mainlinetoedera/6.18-lts(539665b2f6e8), prepared by Claude. Run log.Merge with Rebase and merge, so
edera/6.18-ltsstays linear.Independent checks
Builds: success (x86_64 and arm64 vmlinux with the Edera features built in).
539665b2f6e891c4d631756fClaude's report
Claude left no report (backport step: success).