From: James Morse <james.morse@arm.com>
To: "linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Geoff Levand <geoff@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
AKASHI Takahiro <takahiro.akashi@linaro.org>,
Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>,
Dave Young <dyoung@redhat.com>,
"kexec@lists.infradead.org" <kexec@lists.infradead.org>
Subject: Re: [PATCH v26 0/7] arm64: add kdump support
Date: Mon, 19 Sep 2016 17:05:48 +0100 [thread overview]
Message-ID: <57E00CDC.70403@arm.com> (raw)
In-Reply-To: <CAKv+Gu_UvFnPtFHggaO6Z_ePuArdchEK1qYWPkkwpcgLus3Epw@mail.gmail.com>
On 16/09/16 21:17, Ard Biesheuvel wrote:
> On 16 September 2016 at 17:04, James Morse <james.morse@arm.com> wrote:
>> Mark, Ard, how does/will reserved-memory work on an APCI only system?
>
> It works by accident, at the moment. We used to ignore both
> /memreserve/s and the /reserved-memory node, but due to some unrelated
> refactoring, we ended up honouring the reserved-memory node when
> booting via UEFI
Okay, so kdump probably shouldn't rely on this behaviour...
For an acpi-only system, we could get reserve_crashkernel() to copy the uefi
memory map into the reserved region, changing the region types for existing
kernel memory to EfiReservedMemoryType (for example) and fixing up the reserved
region boundaries.
This second memory map could then be added alongside the real one in the
DT/chosen, and used in preference the second time we go through uefi_init() in
the crash kernel.
kexec-tools would still need to keep the '/reserved-memory' node for non-uefi
systems.
Doing this doesn't depend on userspace, and means the uefi memory map is still
the one and only true source of memory layout information. If fixing it like
this is valid I don't think it should block kdump.
... I will think about this some more before trying to put it together.
Thanks,
James
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next prev parent reply other threads:[~2016-09-19 16:05 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-07 4:29 [PATCH v26 0/7] arm64: add kdump support AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 1/7] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro
2016-09-22 10:23 ` Matthias Bruger
2016-09-23 8:37 ` AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 2/7] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro
2016-09-14 18:09 ` James Morse
2016-09-15 8:13 ` Marc Zyngier
2016-09-16 3:21 ` AKASHI Takahiro
2016-09-16 14:49 ` James Morse
2016-09-20 7:36 ` AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 3/7] arm64: kdump: add kdump support AKASHI Takahiro
2016-09-16 14:50 ` James Morse
2016-09-20 7:46 ` AKASHI Takahiro
2016-09-22 15:50 ` Matthias Brugger
2016-09-07 4:29 ` [PATCH v26 4/7] arm64: kdump: add VMCOREINFO's for user-space coredump tools AKASHI Takahiro
2016-09-16 16:04 ` James Morse
2016-09-07 4:29 ` [PATCH v26 5/7] arm64: kdump: enable kdump in the arm64 defconfig AKASHI Takahiro
2016-09-07 4:29 ` [PATCH v26 6/7] arm64: kdump: update a kernel doc AKASHI Takahiro
2016-09-16 16:08 ` James Morse
2016-09-20 8:27 ` AKASHI Takahiro
2016-09-26 17:21 ` Matthias Brugger
2016-09-07 4:32 ` [PATCH v26 7/7] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro
2016-09-16 13:03 ` Rob Herring
2016-09-07 4:37 ` [PATCH v26 0/7] arm64: add kdump support AKASHI Takahiro
2016-09-16 16:04 ` James Morse
2016-09-16 20:17 ` Ard Biesheuvel
2016-09-19 16:05 ` James Morse [this message]
2016-09-19 16:10 ` Ard Biesheuvel
2016-09-21 7:42 ` AKASHI Takahiro
2016-09-21 7:33 ` AKASHI Takahiro
2016-10-03 7:54 ` Manish Jaggi
2016-10-03 11:04 ` AKASHI Takahiro
2016-10-03 12:41 ` Manish Jaggi
2016-10-04 2:56 ` AKASHI Takahiro
2016-10-04 9:46 ` James Morse
2016-10-04 10:05 ` Manish Jaggi
2016-10-04 10:53 ` James Morse
2016-10-04 13:23 ` Manish Jaggi
2016-10-05 5:48 ` AKASHI Takahiro
2016-10-05 5:41 ` AKASHI Takahiro
2016-10-04 10:18 ` Mark Rutland
2016-10-17 15:41 ` Ruslan Bilovol
2016-10-18 6:26 ` AKASHI Takahiro
2016-11-01 12:19 ` Ruslan Bilovol
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