linux-kernel - Re: [PATCH v3 2/4] x86/syscall: update and extend selftest syscall_numbering

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Message-ID: <YKDPJum3pB/Ma9Gs@gmail.com>
Date:   Sun, 16 May 2021 09:52:06 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/4] x86/syscall: update and extend selftest
 syscall_numbering_64


* H. Peter Anvin <hpa@...or.com> wrote:

> From: "H. Peter Anvin (Intel)" <hpa@...or.com>
> 
> Update the syscall_numbering_64 selftest to reflect that a system call
> is to be extended from 32 bits. Add a mix of tests for valid and
> invalid system calls in 64-bit and x32 space.
> 
> Use an explicit system call instruction, because we cannot know if the
> glibc syscall() wrapper intercepts instructions, extends the system
> call number independently, or anything similar.
> 
> Use long long instead of long to make it possible to compile this test
> on x32 as well as 64 bits.
> 
> Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
> ---
>  .../testing/selftests/x86/syscall_numbering.c | 274 ++++++++++++++----
>  1 file changed, 222 insertions(+), 52 deletions(-)

Small request: I'd suggest moving this to the first place - so that we can 
easily test before/after effects of (current) patch #1/4.

Thanks,

	Ingo