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| author | Hou Wenlong <houwenlong.hwl@antgroup.com> | 2023-06-09 17:45:31 +0800 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-11-13 12:23:27 +0100 |
| commit | 5c22c4726e4a9c6b2e182c0b21c2d3dd63f608c4 (patch) | |
| tree | 40ef340dd4cb669c419f31e696a5c9066218b3de /arch/x86/kernel/callthunks.c | |
| parent | b85ea95d086471afb4ad062012a4d73cd328fa86 (diff) | |
| download | lwn-5c22c4726e4a9c6b2e182c0b21c2d3dd63f608c4.tar.gz lwn-5c22c4726e4a9c6b2e182c0b21c2d3dd63f608c4.zip | |
x86/paravirt: Use relative reference for the original instruction offset
Similar to the alternative patching, use a relative reference for original
instruction offset rather than absolute one, which saves 8 bytes for one
PARA_SITE entry on x86_64. As a result, a R_X86_64_PC32 relocation is
generated instead of an R_X86_64_64 one, which also reduces relocation
metadata on relocatable builds. Hardcode the alignment to 4 now.
[ bp: Massage commit message. ]
Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/9e6053107fbaabc0d33e5d2865c5af2c67ec9925.1686301237.git.houwenlong.hwl@antgroup.com
Diffstat (limited to 'arch/x86/kernel/callthunks.c')
| -rw-r--r-- | arch/x86/kernel/callthunks.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c index e9ad518a5003..57e5c2e75c2a 100644 --- a/arch/x86/kernel/callthunks.c +++ b/arch/x86/kernel/callthunks.c @@ -240,7 +240,7 @@ patch_paravirt_call_sites(struct paravirt_patch_site *start, struct paravirt_patch_site *p; for (p = start; p < end; p++) - patch_call(p->instr, ct); + patch_call((void *)&p->instr_offset + p->instr_offset, ct); } static __init_or_module void |