From: Baoquan He <bhe@redhat.com>
To: Chao Fan <fanc.fnst@cn.fujitsu.com>
Cc: Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, x86@kernel.org,
linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org,
mingo@redhat.com, hpa@zytor.com, keescook@chromium.org,
rjw@rjwysocki.net, lenb@kernel.org, ard.biesheuvel@linaro.org,
indou.takao@jp.fujitsu.com, caoj.fnst@cn.fujitsu.com,
Masayoshi Mizuma <msys.mizuma@gmail.com>
Subject: Re: [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory
Date: Wed, 10 Oct 2018 17:21:17 +0800 [thread overview]
Message-ID: <20181010092117.GG25297@MiWiFi-R3L-srv> (raw)
In-Reply-To: <20181010091205.GA10618@localhost.localdomain>
On 10/10/18 at 05:12pm, Chao Fan wrote:
> On Wed, Oct 10, 2018 at 05:06:20PM +0800, Baoquan He wrote:
> >Hi Boris,
> >
> >On 10/10/18 at 10:59am, Borislav Petkov wrote:
> >> ... and we just picked up
> >>
> >> https://lkml.kernel.org/r/20181001140843.26137-1-msys.mizuma@gmail.com
> >>
> >> and without having looked at the rest of your stuff, if people accept
> >> your solution, we don't need the silly parameter anymore, right?
> >>
> >> Which means, we should not rush the whole thing yet until the whole
> >> KASLR vs movable memory gets solved properly.
> >
> >Masa's patches solves the problem in memory region KASLR which later hot
> >added memory may be big than the default padding 10 TB.
> >
> >Chao's patches is trying to fix a conflict between 'movable_node' and
> >kernel text KASLR. If 'movable_node' specified, we rely on SRAT to get
> >which memory region is movable or immovable, and movable region can be
> >hot removed. But if kernel is randomized into movable memory, it can't
> >be hot removed any more, this is a regression after KASLR introduced.
> >So this is a different issue than Masa's.
>
> Yes, they are two issues.
> But if we can get more memory information by the function in
> the new file acpi.c, semms it's helfpul to Masa's issue.
Hmm, reading SRAT three times during x86 kernel boot? Maybe we try this
after the function has run a time and proved very stable?
Thanks
Baoquan
next prev parent reply other threads:[~2018-10-10 9:21 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-10 8:41 [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in immovable memory Chao Fan
2018-10-10 8:41 ` [PATCH v8 1/3] x86/boot: Add acpitb.c to parse acpi tables Chao Fan
2018-10-11 10:57 ` Borislav Petkov
2018-10-12 1:56 ` Chao Fan
2018-10-12 9:36 ` Chao Fan
2018-10-12 9:46 ` Borislav Petkov
2018-10-12 10:03 ` Chao Fan
2018-10-16 2:48 ` Chao Fan
2018-10-16 12:40 ` Borislav Petkov
2018-10-17 1:10 ` Chao Fan
2018-10-15 20:26 ` Masayoshi Mizuma
2018-10-16 1:50 ` Chao Fan
2018-10-10 8:41 ` [PATCH v8 2/3] x86/boot/KASLR: Walk srat tables to filter immovable memory Chao Fan
2018-10-10 8:41 ` [PATCH v8 3/3] x86/boot/KASLR: Limit kaslr to choosing the " Chao Fan
2018-10-10 8:59 ` [PATCH v8 0/3] x86/boot/KASLR: Parse ACPI table and limit kaslr in " Borislav Petkov
2018-10-10 9:06 ` Baoquan He
2018-10-10 9:12 ` Chao Fan
2018-10-10 9:21 ` Baoquan He [this message]
2018-10-10 9:14 ` Thomas Gleixner
2018-10-10 9:19 ` Borislav Petkov
2018-10-10 9:30 ` Baoquan He
2018-10-10 19:44 ` Masayoshi Mizuma
2018-10-11 0:29 ` Baoquan He
2018-10-11 5:51 ` Chao Fan
2018-10-13 20:19 ` Masayoshi Mizuma
2018-10-13 20:34 ` Borislav Petkov
2018-10-13 21:45 ` Masayoshi Mizuma
2018-10-13 22:05 ` Borislav Petkov
2018-10-15 0:50 ` Masayoshi Mizuma
2018-10-16 15:13 ` Masayoshi Mizuma
2018-10-16 19:11 ` Borislav Petkov
2018-10-16 19:54 ` Masayoshi Mizuma
2018-10-16 19:59 ` Borislav Petkov
2018-10-22 15:42 ` Masayoshi Mizuma
2018-10-23 2:48 ` Chao Fan
2018-10-24 19:21 ` Masayoshi Mizuma
2018-10-25 1:22 ` Chao Fan
2018-10-25 10:33 ` Borislav Petkov
2018-10-25 13:40 ` Masayoshi Mizuma
2018-11-06 12:10 ` Borislav Petkov
2018-11-06 14:07 ` Baoquan He
2018-11-07 1:21 ` Chao Fan
2018-11-06 18:45 ` Borislav Petkov
2018-11-06 19:36 ` Masayoshi Mizuma
2018-11-06 20:45 ` Borislav Petkov
2018-11-06 22:21 ` Masayoshi Mizuma
2018-11-08 10:51 ` Borislav Petkov
2018-11-10 10:54 ` Borislav Petkov
2018-11-11 13:45 ` Masayoshi Mizuma
2019-02-05 15:05 ` Masayoshi Mizuma
2019-02-08 18:26 ` Borislav Petkov
2019-02-09 0:24 ` Masayoshi Mizuma
2019-02-11 1:46 ` Chao Fan
2019-02-11 20:11 ` Masayoshi Mizuma
2018-10-10 17:16 ` Borislav Petkov
2018-10-11 1:30 ` Chao Fan
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