summaryrefslogtreecommitdiff
path: root/tools/perf/scripts/python/export-to-postgresql.py
diff options
context:
space:
mode:
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2025-02-17 18:38:21 +0200
committerIngo Molnar <mingo@kernel.org>2025-02-21 15:05:45 +0100
commit81256a50aa0fddefbf4849db8cad9f70c5167c04 (patch)
tree19f5df33e8200000022fa3e5a3fc637f7dfd6458 /tools/perf/scripts/python/export-to-postgresql.py
parenta9ebcb88136ca80cb53de27ca5ae77de18bbe368 (diff)
x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default
Currently memremap(MEMREMAP_WB) can produce decrypted/shared mapping: memremap(MEMREMAP_WB) arch_memremap_wb() ioremap_cache() __ioremap_caller(.encrytped = false) In such cases, the IORES_MAP_ENCRYPTED flag on the memory will determine if the resulting mapping is encrypted or decrypted. Creating a decrypted mapping without explicit request from the caller is risky: - It can inadvertently expose the guest's data and compromise the guest. - Accessing private memory via shared/decrypted mapping on TDX will either trigger implicit conversion to shared or #VE (depending on VMM implementation). Implicit conversion is destructive: subsequent access to the same memory via private mapping will trigger a hard-to-debug #VE crash. The kernel already provides a way to request decrypted mapping explicitly via the MEMREMAP_DEC flag. Modify memremap(MEMREMAP_WB) to produce encrypted/private mapping by default unless MEMREMAP_DEC is specified or if the kernel runs on a machine with SME enabled. It fixes the crash due to #VE on kexec in TDX guests if CONFIG_EISA is enabled. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-mm@kvack.org Link: https://lore.kernel.org/r/20250217163822.343400-3-kirill.shutemov@linux.intel.com
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions