PT-2026-111665 · Xen · Xen
None
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XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown
(CVE-2017-5754, one aspect of XSA-254). This involves copying 64-bit PV
guest page table entries from guest-chosen root page tables to the Xen-
chosen one which is in actual use by hardware. To read the guest root
page table, the directmap is used. PV guests, however, have a directmap
which may not cover all memory; in particular this is the case if any
memory extends beyond the 5 TiB (CONFIG BIGMEM=y: 3.5 TiB) address
boundary.
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Related Identifiers
Affected Products
Xen