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Backport #72 to 6.18-lts: 9p/xen: grant each ring page by its own frame - #73
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The data pages of a ring are granted as the first page's frame plus the page index. That holds for auto-translated guests, whose grant frames are pseudo-physical. A PV guest grants machine frames, and alloc_pages_exact() only promises pseudo-physical contiguity. When the pages are not machine-contiguous the backend maps the frames that follow the first one. Some of those are other pages of the guest, so requests read as garbage, and some cannot be granted at all, so the mapping fails. A freshly built PV guest is usually machine-contiguous within a 2 MiB block, which hid this. A PV guest restored from a snapshot gets its frames one page at a time, so its first request on ring 0 after the restore arrives as a malformed frame and the mount hangs. Look up the frame of each page instead. Signed-off-by: Kavi Daula <kavi@edera.dev> (cherry picked from commit 8115eea)
clupuishere
approved these changes
Nov 4, 2026
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Backport of #72 from
edera/mainlinetoedera/6.18-lts(f20f61dd3909), 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).
f20f61dd39094594ea2d7b0cClaude's report
Claude left no report (backport step: success).