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x86/paravirt: Make the struct paravirt_patch_site packed

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Similar to struct alt_instr, make the struct paravirt_patch_site packed
and get rid of all the .align directives and save 2 bytes for one
PARA_SITE entry on X86_64.

  [ bp: Massage commit message. ]

Suggested-by: Nadav Amit <namit@vmware.com>
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/6dcb20159ded36586c5f7f2ae159e4e030256627.1686301237.git.houwenlong.hwl@antgroup.com
This commit is contained in:
Hou Wenlong 2023-06-09 17:45:32 +08:00 committed by Borislav Petkov (AMD)
parent 5c22c4726e
commit fe22bc430c
2 changed files with 1 additions and 5 deletions
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2
arch/x86/include/asm/paravirt.h
View File

@ -748,11 +748,9 @@ void native_pv_lock_init(void) __init;
ops; \
772:; \
.pushsection .parainstructions,"a"; \
.align 4; \
.long 771b-.; \
.byte ptype; \
.byte 772b-771b; \
.align 4; \
.popsection

4
arch/x86/include/asm/paravirt_types.h
View File

@ -8,7 +8,7 @@ struct paravirt_patch_site {
s32 instr_offset; /* original instructions */
u8 type; /* type of this instruction */
u8 len; /* length of original instruction */
};
} __packed;
#endif
#ifdef CONFIG_PARAVIRT
@ -263,11 +263,9 @@ extern struct paravirt_patch_template pv_ops;
#define _paravirt_alt(insn_string, type) \
"771:\n\t" insn_string "\n" "772:\n" \
".pushsection .parainstructions,\"a\"\n" \
" .align 4\n" \
" .long 771b-.\n" \
" .byte " type "\n" \
" .byte 772b-771b\n" \
" .align 4\n" \
".popsection\n"
/* Generate patchable code, with the default asm parameters. */