[tip: x86/core] tools/objtool: Check for use of the ENQCMD instruction in the kernel

tip-bot2 for Fenghua Yu
2022-03-15T10:48:45Z

The following commit has been merged into the x86/core branch of tip:

Commit-ID: 227a06553fe6c785f23d76eece3bb10e2db5059c
Gitweb: https://git.kernel.org/tip/227a06553fe6c785f23d76eece3bb10e2db5059c
Author: Fenghua Yu <fenghua.yu@intel.com>
AuthorDate: Mon, 07 Feb 2022 15:02:53 -08:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:30 +01:00

tools/objtool: Check for use of the ENQCMD instruction in the kernel

The ENQCMD instruction implicitly accesses the PASID_MSR to fill in the
pasid field of the descriptor being submitted to an accelerator. But
there is no precise (and stable across kernel changes) point at which
the PASID_MSR is updated from the value for one task to the next.

Kernel code that uses accelerators must always use the ENQCMDS instruction
which does not access the PASID_MSR.

Check for use of the ENQCMD instruction in the kernel and warn on its
usage.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220207230254.3342514-11-fenghua.yu@intel.com
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
---
tools/objtool/arch/x86/decode.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index c10ef78..479e769 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -112,7 +112,7 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
const struct elf *elf = file->elf;
struct insn insn;
int x86_64, ret;
- unsigned char op1, op2,
+ unsigned char op1, op2, op3,
rex = 0, rex_b = 0, rex_r = 0, rex_w = 0, rex_x = 0,
modrm = 0, modrm_mod = 0, modrm_rm = 0, modrm_reg = 0,
sib = 0, /* sib_scale = 0, */ sib_index = 0, sib_base = 0;
@@ -139,6 +139,7 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec

op1 = insn.opcode.bytes[0];
op2 = insn.opcode.bytes[1];
+ op3 = insn.opcode.bytes[2];

if (insn.rex_prefix.nbytes) {
rex = insn.rex_prefix.bytes[0];
@@ -491,6 +492,14 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
/* nopl/nopw */
*type = INSN_NOP;

+ } else if (op2 == 0x38 && op3 == 0xf8) {
+ if (insn.prefixes.nbytes == 1 &&
+ insn.prefixes.bytes[0] == 0xf2) {
+ /* ENQCMD cannot be used in the kernel. */
+ WARN("ENQCMD instruction at %s:%lx", sec->name,
+ offset);
+ }
+
} else if (op2 == 0xa0 || op2 == 0xa8) {

/* push fs/gs */