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From: Ingo Molnar <mingo@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org, "Joan Bruguera" <joanbrugueram@gmail.com>,
	linux-kernel@vger.kernel.org, "Juergen Gross" <jgross@suse.com>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	xen-devel <xen-devel@lists.xenproject.org>,
	"Jan Beulich" <jbeulich@suse.com>,
	"Roger Pau Monne" <roger.pau@citrix.com>,
	"Kees Cook" <keescook@chromium.org>,
	mark.rutland@arm.com, "Andrew Cooper" <Andrew.Cooper3@citrix.com>,
	"Jörg Rödel" <joro@8bytes.org>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v2 6/7] x86/power: Sprinkle some noinstr
Date: Tue, 17 Jan 2023 12:54:46 +0100	[thread overview]
Message-ID: <Y8aMhihmrahvFnrU@gmail.com> (raw)
In-Reply-To: <Y8aGpHgSOczqeEHf@hirez.programming.kicks-ass.net>


* Peter Zijlstra <peterz@infradead.org> wrote:

> Nope, they do as they say on the tin.
> 
> noinstr void foo(void)
> {
> }
> 
> declares the whole function as non-instrumented.
> 
> Within such functions, we demark regions where instrumentation is
> allowed by:
> 
> noinstr void foo(void)
> {
> 	instrumentation_begin();
> 	/* code that calls non-noinstr functions goes here */
> 	instrumentation_end();

Indeed, you are right - I should have gotten more of my morning tea ... :-/

Thanks,

	Ingo


  reply	other threads:[~2023-01-17 11:55 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-16 14:25 [PATCH v2 0/7] x86: retbleed=stuff fixes Peter Zijlstra
2023-01-16 14:25 ` [PATCH v2 1/7] x86/boot: Remove verify_cpu() from secondary_startup_64() Peter Zijlstra
2023-01-17  9:25   ` Ingo Molnar
2023-01-18  9:45   ` Peter Zijlstra
2023-01-18 11:46     ` kirill.shutemov
2023-01-19 19:35     ` H. Peter Anvin
2023-01-26 14:15       ` Peter Zijlstra
2023-01-16 14:25 ` [PATCH v2 2/7] x86/boot: Delay sev_verify_cbit() a bit Peter Zijlstra
2023-01-19 13:18   ` Borislav Petkov
2023-01-20 12:43     ` Jörg Rödel
2023-01-16 14:25 ` [PATCH v2 3/7] x86/power: De-paravirt restore_processor_state() Peter Zijlstra
2023-01-20 20:26   ` Borislav Petkov
2023-01-16 14:25 ` [PATCH v2 4/7] x86/power: Inline write_cr[04]() Peter Zijlstra
2023-01-20 20:29   ` Borislav Petkov
2023-01-16 14:25 ` [PATCH v2 5/7] x86/callthunk: No callthunk for restore_processor_state() Peter Zijlstra
2023-01-16 14:25 ` [PATCH v2 6/7] x86/power: Sprinkle some noinstr Peter Zijlstra
2023-01-17  9:31   ` Ingo Molnar
2023-01-17 11:29     ` Peter Zijlstra
2023-01-17 11:54       ` Ingo Molnar [this message]
2023-01-16 14:25 ` [PATCH v2 7/7] PM / hibernate: Add minimal noinstr annotations Peter Zijlstra
2023-01-18  1:54 ` [PATCH v2 0/7] x86: retbleed=stuff fixes Joan Bruguera
2023-05-16 13:59 ` Josh Poimboeuf

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