From: Josh Poimboeuf <jpoimboe@redhat.com> To: Juergen Gross <jgross@suse.com> Cc: Borislav Petkov <bp@alien8.de>, x86@kernel.org, linux-kernel@vger.kernel.org, Andy Lutomirski <luto@kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Sasha Levin <alexander.levin@verizon.com>, live-patching@vger.kernel.org, Jiri Slaby <jslaby@suse.cz>, Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, Peter Zijlstra <peterz@infradead.org>, Mike Galbraith <efault@gmx.de>, Alok Kataria <akataria@vmware.com>, Rusty Russell <rusty@rustcorp.com.au>, virtualization@lists.linux-foundation.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, xen-devel@lists.xenproject.org, Thomas Gleixner <tglx@linutronix.de> Subject: Re: [PATCH 03/13] x86/paravirt: Convert native patch assembly code strings to macros Date: Sat, 18 Nov 2017 07:17:00 -0600 [thread overview] Message-ID: <20171118131700.y4iv3iepni6jwfc4@treble> (raw) In-Reply-To: <4022805e-38b2-869c-a766-b7e5026a263e@suse.com> On Sat, Nov 18, 2017 at 11:20:06AM +0100, Juergen Gross wrote: > >>>> +#define NATIVE_ZERO "xor " _REG_ARG1 ", " _REG_ARG1 > >>> > >>> NATIVE_ZERO_OUT > >>> > >>> I guess. NATIVE_ZERO reads like the native representation of 0 :-) > >> > >> NATIVE_ZERO_ARG1? > > > > On a slight tangent, does anybody know why it zeros the arg? > > Why are _you_ asking? You've introduced it. So I did. Touché! > > The only place it's used is here: > > > > #if defined(CONFIG_PARAVIRT_SPINLOCKS) > > DEF_NATIVE(pv_lock_ops, queued_spin_unlock, NATIVE_QUEUED_SPIN_UNLOCK); > > DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, NATIVE_ZERO); > > #endif > > > > Isn't that a bug? Seems like it should _return_ zero. Zeroing the arg > > shouldn't have any effect. > > Right. Before that patch it _did_ return zero instead of zeroing arg1. Oops! > > If I'm right, we could call it NATIVE_FALSE. > > I'd prefer NATIVE_ZERO, as it will be usable for non-boolean cases, too. NATIVE_ZERO works for me. -- Josh
WARNING: multiple messages have this Message-ID (diff)
From: Josh Poimboeuf <jpoimboe@redhat.com> To: Juergen Gross <jgross@suse.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>, Rusty Russell <rusty@rustcorp.com.au>, Mike Galbraith <efault@gmx.de>, Thomas Gleixner <tglx@linutronix.de>, xen-devel@lists.xenproject.org, Peter Zijlstra <peterz@infradead.org>, Jiri Slaby <jslaby@suse.cz>, x86@kernel.org, linux-kernel@vger.kernel.org, Sasha Levin <alexander.levin@verizon.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, live-patching@vger.kernel.org, Alok Kataria <akataria@vmware.com>, virtualization@lists.linux-foundation.org, Linus Torvalds <torvalds@linux-foundation.org>, Ingo Molnar <mingo@kernel.org> Subject: Re: [PATCH 03/13] x86/paravirt: Convert native patch assembly code strings to macros Date: Sat, 18 Nov 2017 07:17:00 -0600 [thread overview] Message-ID: <20171118131700.y4iv3iepni6jwfc4@treble> (raw) In-Reply-To: <4022805e-38b2-869c-a766-b7e5026a263e@suse.com> On Sat, Nov 18, 2017 at 11:20:06AM +0100, Juergen Gross wrote: > >>>> +#define NATIVE_ZERO "xor " _REG_ARG1 ", " _REG_ARG1 > >>> > >>> NATIVE_ZERO_OUT > >>> > >>> I guess. NATIVE_ZERO reads like the native representation of 0 :-) > >> > >> NATIVE_ZERO_ARG1? > > > > On a slight tangent, does anybody know why it zeros the arg? > > Why are _you_ asking? You've introduced it. So I did. Touché! > > The only place it's used is here: > > > > #if defined(CONFIG_PARAVIRT_SPINLOCKS) > > DEF_NATIVE(pv_lock_ops, queued_spin_unlock, NATIVE_QUEUED_SPIN_UNLOCK); > > DEF_NATIVE(pv_lock_ops, vcpu_is_preempted, NATIVE_ZERO); > > #endif > > > > Isn't that a bug? Seems like it should _return_ zero. Zeroing the arg > > shouldn't have any effect. > > Right. Before that patch it _did_ return zero instead of zeroing arg1. Oops! > > If I'm right, we could call it NATIVE_FALSE. > > I'd prefer NATIVE_ZERO, as it will be usable for non-boolean cases, too. NATIVE_ZERO works for me. -- Josh _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2017-11-18 13:17 UTC|newest] Thread overview: 175+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-10-04 15:58 [PATCH 00/13] x86/paravirt: Make pv ops code generation more closely match reality Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 01/13] x86/paravirt: remove wbinvd() paravirt interface Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-24 13:17 ` Juergen Gross 2017-10-24 13:17 ` Juergen Gross 2017-10-24 13:17 ` Juergen Gross 2017-11-17 14:39 ` Borislav Petkov 2017-11-17 14:39 ` Borislav Petkov 2017-11-17 14:39 ` Borislav Petkov 2017-10-04 15:58 ` [PATCH 02/13] x86/paravirt: Fix output constraint macro names Josh Poimboeuf 2017-10-25 9:33 ` Juergen Gross 2017-10-25 9:33 ` Juergen Gross 2017-11-16 20:50 ` Josh Poimboeuf 2017-11-16 20:50 ` Josh Poimboeuf 2017-11-16 20:50 ` Josh Poimboeuf 2017-11-17 6:55 ` Juergen Gross 2017-11-17 6:55 ` Juergen Gross 2017-11-17 6:55 ` Juergen Gross 2017-10-25 9:33 ` Juergen Gross 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 03/13] x86/paravirt: Convert native patch assembly code strings to macros Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 9:46 ` Juergen Gross 2017-10-25 9:46 ` Juergen Gross 2017-10-25 9:46 ` Juergen Gross 2017-11-16 21:04 ` Josh Poimboeuf 2017-11-16 21:04 ` Josh Poimboeuf 2017-11-16 21:04 ` Josh Poimboeuf 2017-11-17 18:07 ` Borislav Petkov 2017-11-17 18:07 ` Borislav Petkov 2017-11-17 18:07 ` Borislav Petkov 2017-11-17 19:10 ` Juergen Gross 2017-11-17 19:10 ` Juergen Gross 2017-11-17 19:10 ` Juergen Gross 2017-11-17 19:42 ` Josh Poimboeuf 2017-11-17 19:42 ` Josh Poimboeuf 2017-11-18 10:20 ` Juergen Gross 2017-11-18 10:20 ` Juergen Gross 2017-11-18 13:17 ` Josh Poimboeuf [this message] 2017-11-18 13:17 ` Josh Poimboeuf 2017-11-18 13:17 ` Josh Poimboeuf 2017-11-18 10:20 ` Juergen Gross 2017-11-17 19:42 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 04/13] x86/paravirt: Convert DEF_NATIVE macro to GCC extended asm syntax Josh Poimboeuf 2017-10-25 10:03 ` Juergen Gross 2017-10-25 10:03 ` Juergen Gross 2017-10-25 10:03 ` Juergen Gross 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 05/13] x86/paravirt: Move paravirt asm macros to paravirt-asm.h Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 10:32 ` Juergen Gross 2017-10-25 10:32 ` Juergen Gross 2017-10-25 10:32 ` Juergen Gross 2017-10-04 15:58 ` [PATCH 06/13] x86/paravirt: Clean up paravirt-asm.h Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 10:59 ` Juergen Gross 2017-10-25 10:59 ` Juergen Gross 2017-10-25 10:59 ` Juergen Gross 2017-10-04 15:58 ` [PATCH 07/13] x86/paravirt: Simplify ____PVOP_CALL() Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 11:01 ` Juergen Gross 2017-10-25 11:01 ` Juergen Gross 2017-10-25 11:01 ` Juergen Gross 2017-11-22 16:35 ` Borislav Petkov 2017-11-22 16:35 ` Borislav Petkov 2017-11-22 16:35 ` Borislav Petkov 2017-10-04 15:58 ` [PATCH 08/13] x86/paravirt: Clean up paravirt_types.h Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 11:08 ` Juergen Gross 2017-10-25 11:08 ` Juergen Gross 2017-10-25 11:08 ` Juergen Gross 2017-11-22 20:46 ` Borislav Petkov 2017-11-22 20:46 ` Borislav Petkov 2017-11-22 20:46 ` Borislav Petkov 2017-10-04 15:58 ` [PATCH 09/13] x86/asm: Convert ALTERNATIVE*() assembler macros to preprocessor macros Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 11:14 ` Juergen Gross 2017-10-25 11:14 ` Juergen Gross 2017-10-25 11:14 ` Juergen Gross 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 10/13] x86/alternative: Support indirect call replacement Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-25 11:25 ` Juergen Gross 2017-10-25 11:25 ` Juergen Gross 2017-10-25 11:25 ` Juergen Gross 2017-11-16 21:19 ` Josh Poimboeuf 2017-11-16 21:19 ` Josh Poimboeuf 2017-11-16 21:19 ` Josh Poimboeuf 2017-11-17 5:46 ` Juergen Gross 2017-11-17 5:46 ` Juergen Gross 2017-11-17 5:46 ` Juergen Gross 2017-11-17 19:52 ` H. Peter Anvin 2017-11-17 19:52 ` H. Peter Anvin 2017-11-17 19:52 ` H. Peter Anvin 2017-10-04 15:58 ` [PATCH 11/13] x86/paravirt: Add paravirt alternatives infrastructure Josh Poimboeuf 2017-10-05 20:35 ` Boris Ostrovsky 2017-10-05 20:35 ` Boris Ostrovsky 2017-10-06 14:32 ` Josh Poimboeuf 2017-10-06 15:29 ` Boris Ostrovsky 2017-10-06 15:29 ` Boris Ostrovsky 2017-10-06 16:30 ` Josh Poimboeuf 2017-10-06 16:30 ` Josh Poimboeuf 2017-10-06 16:30 ` Josh Poimboeuf 2017-10-06 15:29 ` Boris Ostrovsky 2017-10-12 19:11 ` Boris Ostrovsky 2017-10-12 19:11 ` Boris Ostrovsky 2017-10-12 19:11 ` Boris Ostrovsky 2017-10-12 19:27 ` Andrew Cooper 2017-10-12 19:27 ` [Xen-devel] " Andrew Cooper 2017-10-12 19:27 ` Andrew Cooper 2017-10-12 19:53 ` Boris Ostrovsky 2017-10-12 19:53 ` [Xen-devel] " Boris Ostrovsky 2017-10-12 19:53 ` Boris Ostrovsky 2017-10-16 18:18 ` Boris Ostrovsky 2017-10-16 18:18 ` [Xen-devel] " Boris Ostrovsky 2017-10-16 18:18 ` Boris Ostrovsky 2017-10-17 5:24 ` Josh Poimboeuf 2017-10-17 5:24 ` Josh Poimboeuf 2017-10-17 13:58 ` Boris Ostrovsky 2017-10-17 13:58 ` Boris Ostrovsky 2017-10-17 14:36 ` Josh Poimboeuf 2017-10-17 14:36 ` [Xen-devel] " Josh Poimboeuf 2017-10-17 14:36 ` Josh Poimboeuf 2017-10-17 15:36 ` Boris Ostrovsky 2017-10-17 15:36 ` [Xen-devel] " Boris Ostrovsky 2017-10-17 15:36 ` Boris Ostrovsky 2017-10-17 20:17 ` Josh Poimboeuf 2017-10-17 20:17 ` Josh Poimboeuf 2017-10-17 20:36 ` Boris Ostrovsky 2017-10-17 20:36 ` Boris Ostrovsky 2017-10-17 20:50 ` Josh Poimboeuf 2017-10-17 20:50 ` [Xen-devel] " Josh Poimboeuf 2017-10-17 20:59 ` Boris Ostrovsky 2017-10-17 20:59 ` Boris Ostrovsky 2017-10-17 21:03 ` Josh Poimboeuf 2017-10-17 21:03 ` [Xen-devel] " Josh Poimboeuf 2017-10-17 21:03 ` Josh Poimboeuf 2017-10-17 20:59 ` Boris Ostrovsky 2017-10-17 20:50 ` [Xen-devel] " Josh Poimboeuf 2017-10-17 20:36 ` Boris Ostrovsky 2017-10-17 20:17 ` Josh Poimboeuf 2017-10-17 13:58 ` Boris Ostrovsky 2017-10-17 5:24 ` Josh Poimboeuf 2017-10-17 13:10 ` [Xen-devel] " Brian Gerst 2017-10-17 13:10 ` Brian Gerst 2017-10-17 13:10 ` [Xen-devel] " Brian Gerst 2017-10-17 14:05 ` Boris Ostrovsky 2017-10-17 14:05 ` [Xen-devel] " Boris Ostrovsky 2017-10-17 14:05 ` Boris Ostrovsky 2017-10-06 14:32 ` Josh Poimboeuf 2017-10-06 14:32 ` Josh Poimboeuf 2017-10-05 20:35 ` Boris Ostrovsky 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 12/13] objtool: Add support for new .pv_altinstructions section Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` [PATCH 13/13] x86/paravirt: Convert natively patched pv ops to use paravirt alternatives Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-04 15:58 ` Josh Poimboeuf 2017-10-06 7:35 ` [Xen-devel] [PATCH 00/13] x86/paravirt: Make pv ops code generation more closely match reality Vitaly Kuznetsov 2017-10-06 7:35 ` Vitaly Kuznetsov 2017-10-06 14:36 ` Josh Poimboeuf 2017-10-06 14:36 ` Josh Poimboeuf 2017-10-06 14:36 ` [Xen-devel] " Josh Poimboeuf 2017-10-06 7:35 ` Vitaly Kuznetsov
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