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From: Samuel Falvo II <sam.falvo@gmail.com>
To: Paul Miranda <paulcmiranda@gmail.com>
Cc: mark.rutland@arm.com, hch@infradead.org, Damien.LeMoal@wdc.com,
	Olof Johansson <olof.johansson@gmail.com>,
	alankao@andestech.com, "Chang, Abner" <abner.chang@hpe.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Palmer Dabbelt <palmer@sifive.com>,
	Alexander Graf <agraf@suse.de>,
	zong@andestech.com, atish.patra@wdc.com,
	RISC-V SW Dev <sw-dev@groups.riscv.org>,
	paul.walmsley@sifive.com, Anup Patel <anup@brainfault.org>,
	mick@ics.forth.gr, Alistair.Francis@wdc.com,
	Luke Kenneth Casson Leighton <lkcl@lkcl.net>,
	linux-riscv@lists.infradead.org,
	Andrew Waterman <andrew@sifive.com>
Subject: Re: [sw-dev] SBI extension proposal v2
Date: Mon, 28 Jan 2019 19:58:00 -0800	[thread overview]
Message-ID: <CAEz=sok-+NFcZtUcSnWKGC5PKqhzkAjLvbKbVjsUhzS5BTrgsQ@mail.gmail.com> (raw)
In-Reply-To: <09bede45-6ecf-4ded-8615-0be38aac33fc@groups.riscv.org>

On Mon, Jan 28, 2019 at 7:48 PM Paul Miranda <paulcmiranda@gmail.com> wrote:
> I don't know enough about the rest of this thread to comment intelligently, but I'm curious what you advocate with respect to PMP?
> I believe it has usefulness in allowing M mode code to protect it from itself. Is your only concern that it may be used by ROM code that is not replaceable?
> It's definitely not the first protection scheme I've seen that uses lock bits.

If I understand Ron's emails correctly, he already indicated his
experience with such systems, and is basing his dislike of PMP
expressly on that experience.  It seems history records this feature
being abused rather profusely.

-- 
Samuel A. Falvo II

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  parent reply	other threads:[~2019-01-29  3:53 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-10  2:42 SBI extension proposal v2 Atish Patra
2018-11-10  2:42 ` Atish Patra
2018-11-10  5:12 ` [sw-dev] " Luke Kenneth Casson Leighton
2018-11-10  5:12   ` Luke Kenneth Casson Leighton
2018-11-10 14:50   ` Nick Kossifidis
2018-11-10 14:50     ` Nick Kossifidis
2018-11-10 15:48     ` Luke Kenneth Casson Leighton
2018-11-10 15:48       ` Luke Kenneth Casson Leighton
2018-11-10 16:46       ` ron minnich
2018-11-10 16:46         ` ron minnich
2018-11-10 17:40         ` Luke Kenneth Casson Leighton
2018-11-10 17:40           ` Luke Kenneth Casson Leighton
2018-11-10 17:41         ` Samuel Falvo II
2018-11-10 17:41           ` Samuel Falvo II
2018-11-10 17:42           ` Luke Kenneth Casson Leighton
2018-11-10 17:42             ` Luke Kenneth Casson Leighton
2018-11-10 17:51             ` Samuel Falvo II
2018-11-10 17:51               ` Samuel Falvo II
2018-11-10 17:55               ` Luke Kenneth Casson Leighton
2018-11-10 17:55                 ` Luke Kenneth Casson Leighton
2018-11-10 18:03                 ` Samuel Falvo II
2018-11-10 18:03                   ` Samuel Falvo II
2018-11-10 17:43           ` Samuel Falvo II
2018-11-10 17:43             ` Samuel Falvo II
2018-11-10 17:41         ` Olof Johansson
2018-11-10 17:41           ` Olof Johansson
2018-11-10 17:47           ` Luke Kenneth Casson Leighton
2018-11-10 17:47             ` Luke Kenneth Casson Leighton
2018-11-10 17:59             ` Nick Kossifidis
2018-11-10 17:59               ` Nick Kossifidis
2018-11-10 18:01               ` ron minnich
2018-11-10 18:01                 ` ron minnich
2018-11-10 19:33                 ` Luke Kenneth Casson Leighton
2018-11-10 19:33                   ` Luke Kenneth Casson Leighton
2018-11-10 19:39               ` Luke Kenneth Casson Leighton
2018-11-10 19:39                 ` Luke Kenneth Casson Leighton
2018-11-11  3:15                 ` Nick Kossifidis
2018-11-11  3:15                   ` Nick Kossifidis
2018-11-11  7:14                   ` Luke Kenneth Casson Leighton
2018-11-11  7:14                     ` Luke Kenneth Casson Leighton
2018-11-11 13:17                     ` Nick Kossifidis
2018-11-11 13:17                       ` Nick Kossifidis
2018-11-12  2:08                     ` Palmer Dabbelt
2018-11-12  2:08                       ` Palmer Dabbelt
2018-11-10 18:02             ` Olof Johansson
2018-11-10 18:02               ` Olof Johansson
2018-11-10 19:34               ` Luke Kenneth Casson Leighton
2018-11-10 19:34                 ` Luke Kenneth Casson Leighton
2018-11-13  1:22             ` Michael Clark
2018-11-13  1:22               ` Michael Clark
2018-11-10 17:54           ` Nick Kossifidis
2018-11-10 17:54             ` Nick Kossifidis
2018-11-10 17:59           ` ron minnich
2018-11-10 17:59             ` ron minnich
2018-11-11  3:58         ` Atish Patra
2018-11-11  3:58           ` Atish Patra
2018-12-02  6:18           ` Benjamin Herrenschmidt
2019-01-28 12:31             ` Alexander Graf
2019-01-28 16:33               ` Luke Kenneth Casson Leighton
2019-01-28 16:38                 ` Alexander Graf
2019-01-28 16:47                   ` Nick Kossifidis
2019-01-28 19:43                     ` Alexander Graf
2019-01-28 19:47                       ` Atish Patra
2019-01-28 19:48                         ` Alexander Graf
2019-01-28 19:40                   ` ron minnich
2019-01-28 19:55                     ` Alexander Graf
2019-01-28 20:18                       ` ron minnich
2019-01-28 20:37                         ` Alexander Graf
2019-01-28 22:23                           ` ron minnich
2019-01-29  8:53                             ` Alexander Graf
2019-01-29 15:52                               ` ron minnich
2019-01-28 23:46                         ` Luke Kenneth Casson Leighton
2019-01-28 23:22                     ` Bruce Hoult
2019-01-29  0:03                       ` Luke Kenneth Casson Leighton
2019-01-29  4:28                       ` ron minnich
     [not found]                         ` <CANs6eMk4z-ZibLW_5o03onu8AQe23uMa2hSieceHFqKS7igLDQ@mail.gmail.com>
2019-01-30  0:05                           ` Luke Kenneth Casson Leighton
2019-01-30  0:17                             ` ron minnich
2019-01-30  0:49                             ` Bruce Hoult
2019-01-30  3:15                               ` Luke Kenneth Casson Leighton
     [not found]                     ` <09bede45-6ecf-4ded-8615-0be38aac33fc@groups.riscv.org>
2019-01-29  3:58                       ` Samuel Falvo II [this message]
2019-01-29  4:33                       ` ron minnich
2019-02-05 22:29                     ` Benjamin Herrenschmidt
2019-02-05 23:02                       ` Luís Marques
2019-02-06  7:03                         ` ron minnich
2019-02-06  7:54                           ` Damien Le Moal
2019-02-07  3:56                           ` Paul Walmsley
2019-02-07  7:17                             ` Anup Patel
2019-02-07  7:19                             ` Anup Patel
2019-01-29 22:41             ` Palmer Dabbelt
2018-11-10 17:43       ` Nick Kossifidis
2018-11-10 17:43         ` Nick Kossifidis
2018-11-10 17:51         ` Luke Kenneth Casson Leighton
2018-11-10 17:51           ` Luke Kenneth Casson Leighton
2018-11-10  5:36 ` David Abdurachmanov
2018-11-10  5:36   ` David Abdurachmanov
     [not found]   ` <CA++6G0BTdybjhqaXm9EhAz0HsgpwfozK6OEL7DuzbS48RbEChA@mail.gmail.com>
2018-11-10 15:09     ` Nick Kossifidis
2018-11-10 15:09       ` Nick Kossifidis
2018-11-12  4:33 ` Nick Kossifidis
2018-11-12  4:33   ` Nick Kossifidis
2018-12-04 23:22   ` [sw-dev] " Atish Patra

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