From: Alistair Francis <alistair23@gmail.com> To: Peter Maydell <peter.maydell@linaro.org> Cc: "open list:RISC-V" <qemu-riscv@nongnu.org>, Sagar Karandikar <sagark@eecs.berkeley.edu>, bastian@mail.uni-paderborn.de, Palmer Dabbelt <palmer@sifive.com>, "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>, Alistair Francis <Alistair.Francis@wdc.com>, LIU ZhiWei <zhiwei_liu@c-sky.com>, Aleksandar Markovic <aleksandar.m.mail@gmail.com> Subject: Re: [Qemu-devel] RISC-V: Vector && DSP Extension Date: Thu, 15 Aug 2019 14:37:52 -0700 [thread overview] Message-ID: <CAKmqyKM44ZAHgc5cYAiAXXtVG=dMcX1i7FLn+2mMwM1Av4Gqzg@mail.gmail.com> (raw) In-Reply-To: <CAFEAcA9bDU4AWetkR4w4WLUzMW_MMy0CsVa5SibWqf85RyaX5g@mail.gmail.com> On Thu, Aug 15, 2019 at 2:07 AM Peter Maydell <peter.maydell@linaro.org> wrote: > > On Thu, 15 Aug 2019 at 09:53, Aleksandar Markovic > <aleksandar.m.mail@gmail.com> wrote: > > > > > We can accept draft > > > extensions in QEMU as long as they are disabled by default. > > > Hi, Alistair, Palmer, > > > > Is this an official stance of QEMU community, or perhaps Alistair's > > personal judgement, or maybe a rule within risv subcomunity? > > Alistair asked on a previous thread; my view was: > https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg03364.html > and nobody else spoke up disagreeing (summary: should at least be > disabled-by-default and only enabled by setting an explicit > property whose name should start with the 'x-' prefix). Agreed! > > In general QEMU does sometimes introduce experimental extensions > (we've had them in the block layer, for example) and so the 'x-' > property to enable them is a reasonably established convention. > I think it's a reasonable compromise to allow this sort of work > to start and not have to live out-of-tree for a long time, without > confusing users or getting into a situation where some QEMU > versions behave differently or to obsolete drafts of a spec > without it being clear from the command line that experimental > extensions are being enabled. > > There is also an element of "submaintainer judgement" to be applied > here -- upstream is probably not the place for a draft extension > to be implemented if it is: > * still fast moving or subject to major changes of design direction > * major changes to the codebase (especially if it requires > changes to core code) that might later need to be redone > entirely differently > * still experimental Yep, agreed. For RISC-V I think this would extend to only allowing extensions that have backing from the foundation and are under active discussion. Alistair > > thanks > -- PMM
WARNING: multiple messages have this Message-ID (diff)
From: Alistair Francis <alistair23@gmail.com> To: Peter Maydell <peter.maydell@linaro.org> Cc: Aleksandar Markovic <aleksandar.m.mail@gmail.com>, "open list:RISC-V" <qemu-riscv@nongnu.org>, Sagar Karandikar <sagark@eecs.berkeley.edu>, bastian@mail.uni-paderborn.de, Palmer Dabbelt <palmer@sifive.com>, "qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>, Alistair Francis <Alistair.Francis@wdc.com>, LIU ZhiWei <zhiwei_liu@c-sky.com> Subject: Re: [Qemu-riscv] [Qemu-devel] RISC-V: Vector && DSP Extension Date: Thu, 15 Aug 2019 14:37:52 -0700 [thread overview] Message-ID: <CAKmqyKM44ZAHgc5cYAiAXXtVG=dMcX1i7FLn+2mMwM1Av4Gqzg@mail.gmail.com> (raw) In-Reply-To: <CAFEAcA9bDU4AWetkR4w4WLUzMW_MMy0CsVa5SibWqf85RyaX5g@mail.gmail.com> On Thu, Aug 15, 2019 at 2:07 AM Peter Maydell <peter.maydell@linaro.org> wrote: > > On Thu, 15 Aug 2019 at 09:53, Aleksandar Markovic > <aleksandar.m.mail@gmail.com> wrote: > > > > > We can accept draft > > > extensions in QEMU as long as they are disabled by default. > > > Hi, Alistair, Palmer, > > > > Is this an official stance of QEMU community, or perhaps Alistair's > > personal judgement, or maybe a rule within risv subcomunity? > > Alistair asked on a previous thread; my view was: > https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg03364.html > and nobody else spoke up disagreeing (summary: should at least be > disabled-by-default and only enabled by setting an explicit > property whose name should start with the 'x-' prefix). Agreed! > > In general QEMU does sometimes introduce experimental extensions > (we've had them in the block layer, for example) and so the 'x-' > property to enable them is a reasonably established convention. > I think it's a reasonable compromise to allow this sort of work > to start and not have to live out-of-tree for a long time, without > confusing users or getting into a situation where some QEMU > versions behave differently or to obsolete drafts of a spec > without it being clear from the command line that experimental > extensions are being enabled. > > There is also an element of "submaintainer judgement" to be applied > here -- upstream is probably not the place for a draft extension > to be implemented if it is: > * still fast moving or subject to major changes of design direction > * major changes to the codebase (especially if it requires > changes to core code) that might later need to be redone > entirely differently > * still experimental Yep, agreed. For RISC-V I think this would extend to only allowing extensions that have backing from the foundation and are under active discussion. Alistair > > thanks > -- PMM
next prev parent reply other threads:[~2019-08-15 21:49 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-08 9:39 [Qemu-devel] RISC-V: Vector && DSP Extension liuzhiwei 2019-08-08 9:39 ` [Qemu-riscv] " liuzhiwei 2019-08-08 11:29 ` [Qemu-devel] " Aleksandar Markovic 2019-08-08 11:29 ` [Qemu-riscv] " Aleksandar Markovic 2019-08-08 13:48 ` Chih-Min Chao 2019-08-08 13:48 ` [Qemu-riscv] " Chih-Min Chao 2019-08-08 14:19 ` Aleksandar Markovic 2019-08-08 14:19 ` [Qemu-riscv] " Aleksandar Markovic 2019-08-10 13:35 ` LIU ZhiWei 2019-08-10 13:35 ` [Qemu-riscv] " LIU ZhiWei 2019-08-10 1:54 ` Alistair Francis 2019-08-10 1:54 ` [Qemu-riscv] " Alistair Francis 2019-08-10 13:55 ` LIU ZhiWei 2019-08-10 13:55 ` [Qemu-riscv] " LIU ZhiWei 2019-08-11 16:50 ` Alistair Francis 2019-08-11 16:50 ` [Qemu-riscv] " Alistair Francis 2019-08-15 8:53 ` Aleksandar Markovic 2019-08-15 8:53 ` [Qemu-riscv] " Aleksandar Markovic 2019-08-15 9:07 ` Peter Maydell 2019-08-15 9:07 ` [Qemu-riscv] " Peter Maydell 2019-08-15 10:32 ` Aleksandar Markovic 2019-08-15 10:32 ` [Qemu-riscv] " Aleksandar Markovic 2019-08-15 21:37 ` Alistair Francis [this message] 2019-08-15 21:37 ` Alistair Francis 2019-08-21 19:31 ` Palmer Dabbelt 2019-08-21 19:31 ` [Qemu-riscv] " Palmer Dabbelt 2019-08-21 23:10 ` [Qemu-devel] [Qemu-riscv] " Jonathan Behrens 2019-08-21 23:10 ` [Qemu-riscv] [Qemu-devel] " Jonathan Behrens 2019-08-22 1:50 ` liuzhiwei 2019-08-22 1:50 ` [Qemu-riscv] " liuzhiwei 2019-08-22 22:37 ` Alistair Francis 2019-08-22 22:37 ` [Qemu-riscv] " Alistair Francis 2019-08-28 0:25 ` Palmer Dabbelt 2019-08-28 0:25 ` [Qemu-riscv] " Palmer Dabbelt
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