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Mon, 10 Jan 2022 13:26:19 +0000 Subject: Re: [PATCH] x86/paravirt: use %rip-relative addressing in hook calls To: Jan Beulich , Thomas Gleixner References: <1ef292aa-9107-4e79-9e60-75887bc04dd3@suse.com> <764eb4c1-0839-b7da-1c7f-837380fa39fd@suse.com> Message-ID: <46270efe-df82-8d95-8b6b-4603f5be7b60@suse.com> Date: Mon, 10 Jan 2022 14:26:18 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <764eb4c1-0839-b7da-1c7f-837380fa39fd@suse.com> Cc: "VMware, Inc." , X86 ML , Linux Virtualization 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: , From: Juergen Gross via Virtualization Reply-To: Juergen Gross Content-Type: multipart/mixed; boundary="===============0233113070434271099==" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --===============0233113070434271099== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="dL7UcAgxXI3Idr5fqaBSKODHC8rWP2kta" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --dL7UcAgxXI3Idr5fqaBSKODHC8rWP2kta Content-Type: multipart/mixed; boundary="JSi4spfwlIzt3bFOiIyGqM2DyNMIa1uEU"; protected-headers="v1" From: Juergen Gross To: Jan Beulich , Thomas Gleixner Cc: "VMware, Inc." , Linux Virtualization , X86 ML Message-ID: <46270efe-df82-8d95-8b6b-4603f5be7b60@suse.com> Subject: Re: [PATCH] x86/paravirt: use %rip-relative addressing in hook calls References: <1ef292aa-9107-4e79-9e60-75887bc04dd3@suse.com> <764eb4c1-0839-b7da-1c7f-837380fa39fd@suse.com> In-Reply-To: <764eb4c1-0839-b7da-1c7f-837380fa39fd@suse.com> --JSi4spfwlIzt3bFOiIyGqM2DyNMIa1uEU Content-Type: multipart/mixed; boundary="------------0E23FCBBCD10651422B7DDF8" Content-Language: en-US This is a multi-part message in MIME format. --------------0E23FCBBCD10651422B7DDF8 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 23.11.21 10:52, Juergen Gross via Virtualization wrote: > On 23.11.21 10:29, Jan Beulich wrote: >> On 05.10.2021 09:43, Juergen Gross wrote: >>> On 30.09.21 14:40, Jan Beulich via Virtualization wrote: >>>> While using a plain (constant) address works, its use needlessly=20 >>>> invokes >>>> a SIB addressing mode, making every call site one byte larger than >>>> necessary. Instead of using an "i" constraint with address-of operat= or >>>> and a 'c' operand modifier, simply use an ordinary "m" constraint,=20 >>>> which >>>> the 64-bit compiler will translate to %rip-relative addressing. This= =20 >>>> way >>>> we also tell the compiler the truth about operand usage - the memory= >>>> location gets actually read, after all. >>>> >>>> 32-bit code generation is unaffected by the change. >>>> >>>> Signed-off-by: Jan Beulich >>> >>> Reviewed-by: Juergen Gross >> >> Thanks. I notice this wasn't part of your 5.16-rc1 pull request, nor >> did it make it into Linus'es tree via any other route. May I ask what >> the plans here are? >=20 > I CC-ed you on the related mail I sent to the x86 maintainers: >=20 > "Re: Which tree for paravirt related patches?" on Nov 4th, and Thomas > Gleixner promised to look at your patch. Adding him to this response > again in order to remind him. Thomas, another ping. Didn't you want to take this patch more than a month ago? Cc-ing the other x86 maintainers, too. 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