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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-03-04 11:24:47 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-03-04 11:24:47 -0800 |
| commit | c5a58f877ca645a3303f7a57476f2de837fdb97a (patch) | |
| tree | d2dccb46b1e676027ebeade1891f30313e7b2305 /arch/x86/include | |
| parent | 43df5242af4ed67e8811257ab1bfe6a07e4a5858 (diff) | |
| parent | 882213990d32fd224340a4533f6318dd152be4b2 (diff) | |
Merge tag 'for-linus-5.12b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
"Two security issues (XSA-367 and XSA-369)"
* tag 'for-linus-5.12b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: fix p2m size in dom0 for disabled memory hotplug case
xen-netback: respect gnttab_map_refs()'s return value
Xen/gnttab: handle p2m update errors on a per-slot basis
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/xen/page.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index 1a162e559753..7068e4bb057d 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -87,6 +87,18 @@ clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops, #endif /* + * The maximum amount of extra memory compared to the base size. The + * main scaling factor is the size of struct page. At extreme ratios + * of base:extra, all the base memory can be filled with page + * structures for the extra memory, leaving no space for anything + * else. + * + * 10x seems like a reasonable balance between scaling flexibility and + * leaving a practically usable system. + */ +#define XEN_EXTRA_MEM_RATIO (10) + +/* * Helper functions to write or read unsigned long values to/from * memory, when the access may fault. */ |