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Date: Wed, 25 Mar 2020 16:39:45 +0100
From: Borislav Petkov <bp@...en8.de>
To: Joerg Roedel <joro@...tes.org>
Cc: x86@...nel.org, hpa@...or.com, Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Hellstrom <thellstrom@...are.com>,
Jiri Slaby <jslaby@...e.cz>,
Dan Williams <dan.j.williams@...el.com>,
Tom Lendacky <thomas.lendacky@....com>,
Juergen Gross <jgross@...e.com>,
Kees Cook <keescook@...omium.org>,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
Joerg Roedel <jroedel@...e.de>,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 05/70] x86/insn: Make inat-tables.c suitable for
pre-decompression code
+ Masami.
On Thu, Mar 19, 2020 at 10:13:02AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@...e.de>
>
> The inat-tables.c file has some arrays in it that contain pointers to
> other arrays. These pointers need to be relocated when the kernel
> image is moved to a different location.
>
> The pre-decompression boot-code has no support for applying ELF
> relocations, so initialize these arrays at runtime in the
> pre-decompression code to make sure all pointers are correctly
> initialized.
>
> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> ---
> arch/x86/tools/gen-insn-attr-x86.awk | 50 +++++++++++++++++++++-
> tools/arch/x86/tools/gen-insn-attr-x86.awk | 50 +++++++++++++++++++++-
> 2 files changed, 98 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk
> index a42015b305f4..af38469afd14 100644
> --- a/arch/x86/tools/gen-insn-attr-x86.awk
> +++ b/arch/x86/tools/gen-insn-attr-x86.awk
> @@ -362,6 +362,9 @@ function convert_operands(count,opnd, i,j,imm,mod)
> END {
> if (awkchecked != "")
> exit 1
> +
> + print "#ifndef __BOOT_COMPRESSED\n"
> +
> # print escape opcode map's array
> print "/* Escape opcode map array */"
> print "const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX + 1]" \
> @@ -388,6 +391,51 @@ END {
> for (j = 0; j < max_lprefix; j++)
> if (atable[i,j])
> print " ["i"]["j"] = "atable[i,j]","
> - print "};"
> + print "};\n"
> +
> + print "#else /* !__BOOT_COMPRESSED */\n"
> +
> + print "/* Escape opcode map array */"
> + print "static const insn_attr_t *inat_escape_tables[INAT_ESC_MAX + 1]" \
> + "[INAT_LSTPFX_MAX + 1];"
> + print ""
> +
> + print "/* Group opcode map array */"
> + print "static const insn_attr_t *inat_group_tables[INAT_GRP_MAX + 1]"\
> + "[INAT_LSTPFX_MAX + 1];"
> + print ""
> +
> + print "/* AVX opcode map array */"
> + print "static const insn_attr_t *inat_avx_tables[X86_VEX_M_MAX + 1]"\
> + "[INAT_LSTPFX_MAX + 1];"
> + print ""
> +
> + print "static void inat_init_tables(void)"
> + print "{"
> +
> + # print escape opcode map's array
> + print "\t/* Print Escape opcode map array */"
> + for (i = 0; i < geid; i++)
> + for (j = 0; j < max_lprefix; j++)
> + if (etable[i,j])
> + print "\tinat_escape_tables["i"]["j"] = "etable[i,j]";"
> + print ""
> +
> + # print group opcode map's array
> + print "\t/* Print Group opcode map array */"
> + for (i = 0; i < ggid; i++)
> + for (j = 0; j < max_lprefix; j++)
> + if (gtable[i,j])
> + print "\tinat_group_tables["i"]["j"] = "gtable[i,j]";"
> + print ""
> + # print AVX opcode map's array
> + print "\t/* Print AVX opcode map array */"
> + for (i = 0; i < gaid; i++)
> + for (j = 0; j < max_lprefix; j++)
> + if (atable[i,j])
> + print "\tinat_avx_tables["i"]["j"] = "atable[i,j]";"
> +
> + print "}"
> + print "#endif"
> }
>
> diff --git a/tools/arch/x86/tools/gen-insn-attr-x86.awk b/tools/arch/x86/tools/gen-insn-attr-x86.awk
> index a42015b305f4..af38469afd14 100644
> --- a/tools/arch/x86/tools/gen-insn-attr-x86.awk
> +++ b/tools/arch/x86/tools/gen-insn-attr-x86.awk
> @@ -362,6 +362,9 @@ function convert_operands(count,opnd, i,j,imm,mod)
> END {
> if (awkchecked != "")
> exit 1
> +
> + print "#ifndef __BOOT_COMPRESSED\n"
> +
> # print escape opcode map's array
> print "/* Escape opcode map array */"
> print "const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX + 1]" \
> @@ -388,6 +391,51 @@ END {
> for (j = 0; j < max_lprefix; j++)
> if (atable[i,j])
> print " ["i"]["j"] = "atable[i,j]","
> - print "};"
> + print "};\n"
> +
> + print "#else /* !__BOOT_COMPRESSED */\n"
> +
> + print "/* Escape opcode map array */"
> + print "static const insn_attr_t *inat_escape_tables[INAT_ESC_MAX + 1]" \
> + "[INAT_LSTPFX_MAX + 1];"
> + print ""
> +
> + print "/* Group opcode map array */"
> + print "static const insn_attr_t *inat_group_tables[INAT_GRP_MAX + 1]"\
> + "[INAT_LSTPFX_MAX + 1];"
> + print ""
> +
> + print "/* AVX opcode map array */"
> + print "static const insn_attr_t *inat_avx_tables[X86_VEX_M_MAX + 1]"\
> + "[INAT_LSTPFX_MAX + 1];"
> + print ""
> +
> + print "static void inat_init_tables(void)"
> + print "{"
> +
> + # print escape opcode map's array
> + print "\t/* Print Escape opcode map array */"
> + for (i = 0; i < geid; i++)
> + for (j = 0; j < max_lprefix; j++)
> + if (etable[i,j])
> + print "\tinat_escape_tables["i"]["j"] = "etable[i,j]";"
> + print ""
> +
> + # print group opcode map's array
> + print "\t/* Print Group opcode map array */"
> + for (i = 0; i < ggid; i++)
> + for (j = 0; j < max_lprefix; j++)
> + if (gtable[i,j])
> + print "\tinat_group_tables["i"]["j"] = "gtable[i,j]";"
> + print ""
> + # print AVX opcode map's array
> + print "\t/* Print AVX opcode map array */"
> + for (i = 0; i < gaid; i++)
> + for (j = 0; j < max_lprefix; j++)
> + if (atable[i,j])
> + print "\tinat_avx_tables["i"]["j"] = "atable[i,j]";"
> +
> + print "}"
> + print "#endif"
> }
>
> --
> 2.17.1
>
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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