From: Paolo Bonzini <pbonzini@redhat.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org
Cc: linux-kernel@vger.kernel.org, live-patching@vger.kernel.org,
Michal Marek <mmarek@suse.cz>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>, Pedro Alves <palves@redhat.com>,
Namhyung Kim <namhyung@gmail.com>,
Bernd Petrovitsch <bernd@petrovitsch.priv.at>,
Chris J Arges <chris.j.arges@canonical.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jiri Slaby <jslaby@suse.cz>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Gleb Natapov <gleb@kernel.org>,
kvm@vger.kernel.org
Subject: Re: [PATCH 25/33] x86/kvm: Set ELF function type for fastop functions
Date: Fri, 22 Jan 2016 11:05:22 +0100 [thread overview]
Message-ID: <56A1FEE2.3020605@redhat.com> (raw)
In-Reply-To: <e399651c89ace54906c203c0557f66ed6ea3ce8d.1453405861.git.jpoimboe@redhat.com>
On 21/01/2016 23:49, Josh Poimboeuf wrote:
> The callable functions created with the FOP* and FASTOP* macros are
> missing ELF function annotations, which confuses tools like stacktool.
> Properly annotate them.
>
> This adds some additional labels to the assembly, but the generated
> binary code is unchanged (with the exception of instructions which have
> embedded references to __LINE__).
>
> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
> Cc: Gleb Natapov <gleb@kernel.org>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: kvm@vger.kernel.org
> ---
> arch/x86/kvm/emulate.c | 29 +++++++++++++++++++++--------
> 1 file changed, 21 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> index 1505587..aa4d726 100644
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -309,23 +309,29 @@ static void invalidate_registers(struct x86_emulate_ctxt *ctxt)
>
> static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
>
> -#define FOP_ALIGN ".align " __stringify(FASTOP_SIZE) " \n\t"
> +#define FOP_FUNC(name) \
> + ".align " __stringify(FASTOP_SIZE) " \n\t" \
> + ".type " name ", @function \n\t" \
> + name ":\n\t"
> +
> #define FOP_RET "ret \n\t"
>
> #define FOP_START(op) \
> extern void em_##op(struct fastop *fake); \
> asm(".pushsection .text, \"ax\" \n\t" \
> ".global em_" #op " \n\t" \
> - FOP_ALIGN \
> - "em_" #op ": \n\t"
> + FOP_FUNC("em_" #op)
>
> #define FOP_END \
> ".popsection")
>
> -#define FOPNOP() FOP_ALIGN FOP_RET
> +#define FOPNOP() \
> + FOP_FUNC(__stringify(__UNIQUE_ID(nop))) \
> + FOP_RET
>
> #define FOP1E(op, dst) \
> - FOP_ALIGN "10: " #op " %" #dst " \n\t" FOP_RET
> + FOP_FUNC(#op "_" #dst) \
> + "10: " #op " %" #dst " \n\t" FOP_RET
>
> #define FOP1EEX(op, dst) \
> FOP1E(op, dst) _ASM_EXTABLE(10b, kvm_fastop_exception)
> @@ -357,7 +363,8 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
> FOP_END
>
> #define FOP2E(op, dst, src) \
> - FOP_ALIGN #op " %" #src ", %" #dst " \n\t" FOP_RET
> + FOP_FUNC(#op "_" #dst "_" #src) \
> + #op " %" #src ", %" #dst " \n\t" FOP_RET
>
> #define FASTOP2(op) \
> FOP_START(op) \
> @@ -395,7 +402,8 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
> FOP_END
>
> #define FOP3E(op, dst, src, src2) \
> - FOP_ALIGN #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET
> + FOP_FUNC(#op "_" #dst "_" #src "_" #src2) \
> + #op " %" #src2 ", %" #src ", %" #dst " \n\t" FOP_RET
>
> /* 3-operand, word-only, src2=cl */
> #define FASTOP3WCL(op) \
> @@ -407,7 +415,12 @@ static int fastop(struct x86_emulate_ctxt *ctxt, void (*fop)(struct fastop *));
> FOP_END
>
> /* Special case for SETcc - 1 instruction per cc */
> -#define FOP_SETCC(op) ".align 4; " #op " %al; ret \n\t"
> +#define FOP_SETCC(op) \
> + ".align 4 \n\t" \
> + ".type " #op ", @function \n\t" \
> + #op ": \n\t" \
> + #op " %al \n\t" \
> + FOP_RET
>
> asm(".global kvm_fastop_exception \n"
> "kvm_fastop_exception: xor %esi, %esi; ret");
>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
next prev parent reply other threads:[~2016-01-22 10:06 UTC|newest]
Thread overview: 133+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 22:49 [PATCH 00/33] Compile-time stack metadata validation Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 01/33] x86/stacktool: " Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 02/33] kbuild/stacktool: Add CONFIG_STACK_VALIDATION option Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 03/33] x86/stacktool: Enable stacktool on x86_64 Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 04/33] x86/stacktool: Add STACKTOOL_IGNORE_FUNC macro Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 05/33] x86/xen: Add stack frame dependency to hypercall inline asm calls Josh Poimboeuf
2016-02-23 8:55 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:45 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 06/33] x86/asm/xen: Set ELF function type for xen_adjust_exception_frame() Josh Poimboeuf
2016-02-23 8:56 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:45 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 07/33] x86/asm/xen: Create stack frames in xen-asm.S Josh Poimboeuf
2016-02-23 8:56 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:45 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 08/33] x86/paravirt: Add stack frame dependency to PVOP inline asm calls Josh Poimboeuf
2016-02-23 8:56 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:46 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 09/33] x86/paravirt: Create a stack frame in PV_CALLEE_SAVE_REGS_THUNK Josh Poimboeuf
2016-02-23 8:57 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:46 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 10/33] x86/amd: Set ELF function type for vide() Josh Poimboeuf
2016-02-23 8:57 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:46 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 11/33] x86/asm/crypto: Move .Lbswap_mask data to .rodata section Josh Poimboeuf
2016-02-23 8:58 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:47 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 12/33] x86/asm/crypto: Move jump_table " Josh Poimboeuf
2016-02-23 8:58 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:47 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 13/33] x86/asm/crypto: Simplify stack usage in sha-mb functions Josh Poimboeuf
2016-02-23 8:59 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:47 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 14/33] x86/asm/crypto: Don't use rbp as a scratch register Josh Poimboeuf
2016-02-23 8:59 ` [tip:x86/debug] x86/asm/crypto: Don't use RBP " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:48 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 15/33] x86/asm/crypto: Create stack frames in crypto functions Josh Poimboeuf
2016-02-23 8:59 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:48 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 16/33] x86/asm/entry: Create stack frames in thunk functions Josh Poimboeuf
2016-02-23 9:00 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:48 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 17/33] x86/asm/acpi: Create a stack frame in do_suspend_lowlevel() Josh Poimboeuf
2016-02-23 9:00 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-23 11:39 ` Pavel Machek
2016-02-25 5:49 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 18/33] x86/asm: Create stack frames in rwsem functions Josh Poimboeuf
2016-02-23 9:01 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:49 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 19/33] x86/asm/efi: Create a stack frame in efi_call() Josh Poimboeuf
2016-02-23 9:01 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:49 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 20/33] x86/asm/power: Create stack frames in hibernate_asm_64.S Josh Poimboeuf
2016-02-23 9:01 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:50 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 21/33] x86/uaccess: Add stack frame output operand in get_user inline asm Josh Poimboeuf
2016-02-23 9:02 ` [tip:x86/debug] x86/uaccess: Add stack frame output operand in get_user() " =?UTF-8?B?dGlwLWJvdCBmb3IgQ2hyaXMgSiBBcmdlcyA8dGlwYm90QHp5dG9yLmNvbT4=?=
2016-02-25 5:50 ` tip-bot for Chris J Arges
2016-01-21 22:49 ` [PATCH 22/33] x86/asm/bpf: Annotate callable functions Josh Poimboeuf
2016-02-23 9:02 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:50 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 23/33] x86/asm/bpf: Create stack frames in bpf_jit.S Josh Poimboeuf
2016-01-22 2:44 ` Alexei Starovoitov
2016-01-22 3:55 ` Josh Poimboeuf
2016-01-22 4:18 ` Alexei Starovoitov
2016-01-22 7:36 ` Ingo Molnar
2016-01-22 15:58 ` Josh Poimboeuf
2016-01-22 17:18 ` Alexei Starovoitov
2016-01-22 17:36 ` Josh Poimboeuf
2016-01-22 17:40 ` Alexei Starovoitov
2016-02-23 9:03 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:51 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 24/33] x86/kprobes: Get rid of kretprobe_trampoline_holder() Josh Poimboeuf
2016-01-21 23:42 ` 平松雅巳 / HIRAMATU,MASAMI
2016-02-23 9:03 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:51 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 25/33] x86/kvm: Set ELF function type for fastop functions Josh Poimboeuf
2016-01-22 10:05 ` Paolo Bonzini [this message]
2016-02-23 9:03 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:51 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 26/33] x86/kvm: Add stack frame dependency to test_cc() inline asm Josh Poimboeuf
2016-01-22 10:05 ` Paolo Bonzini
2016-01-22 16:02 ` Josh Poimboeuf
2016-01-22 16:16 ` [PATCH v16.1 26/33] x86/kvm: Make test_cc() always inline Josh Poimboeuf
2016-02-23 9:04 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:52 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 27/33] watchdog/hpwdt: Create stack frame in asminline_call() Josh Poimboeuf
2016-02-23 9:04 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:52 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 28/33] x86/locking: Create stack frame in PV unlock Josh Poimboeuf
2016-02-23 9:05 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:52 ` tip-bot for Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 29/33] x86/stacktool: Add directory and file whitelists Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 30/33] x86/xen: Add xen_cpuid() to stacktool whitelist Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 31/33] bpf: Add __bpf_prog_run() " Josh Poimboeuf
2016-01-21 22:57 ` Daniel Borkmann
2016-01-22 2:55 ` Alexei Starovoitov
2016-01-22 4:13 ` Josh Poimboeuf
2016-01-22 17:19 ` Alexei Starovoitov
2016-01-21 22:49 ` [PATCH 32/33] sched: Add __schedule() " Josh Poimboeuf
2016-01-21 22:49 ` [PATCH 33/33] x86/kprobes: Add kretprobe_trampoline() " Josh Poimboeuf
2016-01-22 17:43 ` [PATCH 00/33] Compile-time stack metadata validation Chris J Arges
2016-01-22 19:14 ` Josh Poimboeuf
2016-01-22 20:40 ` Chris J Arges
2016-01-22 20:47 ` Josh Poimboeuf
2016-01-22 21:44 ` [PATCH 0/2] A few stacktool warning fixes Chris J Arges
2016-01-22 21:44 ` [PATCH 1/2] tools/stacktool: Add __reiserfs_panic to global_noreturns list Chris J Arges
2016-01-25 15:04 ` Josh Poimboeuf
2016-01-22 21:44 ` [PATCH 2/2] x86/kvm: Add output operand in vmx_handle_external_intr inline asm Chris J Arges
2016-01-25 15:05 ` Josh Poimboeuf
2016-02-23 9:05 ` [tip:x86/debug] " =?UTF-8?B?dGlwLWJvdCBmb3IgQ2hyaXMgSiBBcmdlcyA8dGlwYm90QHp5dG9yLmNvbT4=?=
2016-02-25 5:53 ` tip-bot for Chris J Arges
2016-02-12 10:36 ` [PATCH 00/33] Compile-time stack metadata validation Jiri Slaby
2016-02-12 10:41 ` Jiri Slaby
2016-02-12 14:45 ` Josh Poimboeuf
2016-02-12 17:10 ` Peter Zijlstra
2016-02-12 18:32 ` Josh Poimboeuf
2016-02-12 18:34 ` Josh Poimboeuf
2016-02-12 20:10 ` Peter Zijlstra
2016-02-15 16:31 ` Josh Poimboeuf
2016-02-15 16:49 ` Peter Zijlstra
[not found] ` <CA+55aFzoPCd_LcSx1FUuEhSBYk2KrfzXGj-Vcn39W5bz=KuZhA@mail.gmail.com>
2016-02-15 20:01 ` Josh Poimboeuf
2016-02-18 17:41 ` [PATCH] sched/x86: Add stack frame dependency to __preempt_schedule[_notrace] Josh Poimboeuf
2016-02-19 12:05 ` Jiri Slaby
2016-02-23 9:05 ` [tip:x86/debug] sched/x86: Add stack frame dependency to __preempt_schedule[_notrace]() =?UTF-8?B?dGlwLWJvdCBmb3IgSm9zaCBQb2ltYm9ldWYgPHRpcGJvdEB6eXRvci5jb20+?=
2016-02-25 5:53 ` tip-bot for Josh Poimboeuf
2016-02-15 20:02 ` [PATCH 00/33] Compile-time stack metadata validation Andi Kleen
2016-02-23 8:14 ` Ingo Molnar
2016-02-23 14:27 ` Arnaldo Carvalho de Melo
2016-02-23 15:07 ` Josh Poimboeuf
2016-02-23 15:28 ` Arnaldo Carvalho de Melo
2016-02-23 15:01 ` Josh Poimboeuf
2016-02-24 7:40 ` Ingo Molnar
2016-02-24 16:32 ` Josh Poimboeuf
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