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Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1k3K9p-0000Mo-TQ; Wed, 05 Aug 2020 14:12:42 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id B13C7301E02; Wed, 5 Aug 2020 16:12:37 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A584823D7A30F; Wed, 5 Aug 2020 16:12:37 +0200 (CEST) Date: Wed, 5 Aug 2020 16:12:37 +0200 From: peterz@infradead.org To: Marco Elver Subject: Re: [PATCH] x86/paravirt: Add missing noinstr to arch_local*() helpers Message-ID: <20200805141237.GS2674@hirez.programming.kicks-ass.net> References: <0000000000007d3b2d05ac1c303e@google.com> <20200805132629.GA87338@elver.google.com> <20200805134232.GR2674@hirez.programming.kicks-ass.net> <20200805135940.GA156343@elver.google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200805135940.GA156343@elver.google.com> Cc: jgross@suse.com, fenghua.yu@intel.com, yu-cheng.yu@intel.com, tony.luck@intel.com, dave.hansen@linux.intel.com, syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, virtualization@lists.linux-foundation.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, tglx@linutronix.de, syzbot , x86@kernel.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Wed, Aug 05, 2020 at 03:59:40PM +0200, Marco Elver wrote: > On Wed, Aug 05, 2020 at 03:42PM +0200, peterz@infradead.org wrote: > > Shouldn't we __always_inline those? They're going to be really small. > > I can send a v2, and you can choose. For reference, though: > > ffffffff86271ee0 : > ffffffff86271ee0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > ffffffff86271ee5: 48 83 3d 43 87 e4 01 cmpq $0x0,0x1e48743(%rip) # ffffffff880ba630 > ffffffff86271eec: 00 > ffffffff86271eed: 74 0d je ffffffff86271efc > ffffffff86271eef: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > ffffffff86271ef4: ff 14 25 30 a6 0b 88 callq *0xffffffff880ba630 > ffffffff86271efb: c3 retq > ffffffff86271efc: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > ffffffff86271f01: 0f 0b ud2 > ffffffff86271a90 : > ffffffff86271a90: 53 push %rbx > ffffffff86271a91: 48 89 fb mov %rdi,%rbx > ffffffff86271a94: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > ffffffff86271a99: 48 83 3d 97 8b e4 01 cmpq $0x0,0x1e48b97(%rip) # ffffffff880ba638 > ffffffff86271aa0: 00 > ffffffff86271aa1: 74 11 je ffffffff86271ab4 > ffffffff86271aa3: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > ffffffff86271aa8: 48 89 df mov %rbx,%rdi > ffffffff86271aab: ff 14 25 38 a6 0b 88 callq *0xffffffff880ba638 > ffffffff86271ab2: 5b pop %rbx > ffffffff86271ab3: c3 retq > ffffffff86271ab4: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) > ffffffff86271ab9: 0f 0b ud2 Blergh, that's abysmall. In part I suspect because you have CONFIG_PARAVIRT_DEBUG, let me try and untangle that PV macro maze. _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization