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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2025-06-24 17:59:18 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2025-08-13 15:02:12 -0700 |
| commit | 8ba38a7a9a699905b84fa97578a8291010dec273 (patch) | |
| tree | b7ef847c1d1b5ce238c423c08590c8ebe0288f1c /tools/docs/lib/enrich_formatter.py | |
| parent | 8f5ae30d69d7543eee0d70083daf4de8fe15d585 (diff) | |
x86/vsyscall: Do not require X86_PF_INSTR to emulate vsyscall
emulate_vsyscall() expects to see X86_PF_INSTR in PFEC on a vsyscall
page fault, but the CPU does not report X86_PF_INSTR if neither
X86_FEATURE_NX nor X86_FEATURE_SMEP are enabled.
X86_FEATURE_NX should be enabled on nearly all 64-bit CPUs, except for
early P4 processors that did not support this feature.
Instead of explicitly checking for X86_PF_INSTR, compare the fault
address to RIP.
On machines with X86_FEATURE_NX enabled, issue a warning if RIP is equal
to fault address but X86_PF_INSTR is absent.
[ dhansen: flesh out code comments ]
Originally-by: Dave Hansen <dave.hansen@intel.com>
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Link: https://lore.kernel.org/all/bd81a98b-f8d4-4304-ac55-d4151a1a77ab@intel.com
Link: https://lore.kernel.org/all/20250624145918.2720487-1-kirill.shutemov%40linux.intel.com
Diffstat (limited to 'tools/docs/lib/enrich_formatter.py')
0 files changed, 0 insertions, 0 deletions