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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Dan Williams <dan.j.williams@intel.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	Dave Young <dyoung@redhat.com>, Baoquan He <bhe@redhat.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Keith Busch <keith.busch@intel.com>,
	Michal Hocko <mhocko@suse.com>, Qian Cai <cai@lca.pw>,
	Oscar Salvador <osalvador@suse.de>,
	Eric Biederman <ebiederm@xmission.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	x86@kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH v1 1/3] kernel/resource: make walk_system_ram_res() find all busy IORESOURCE_SYSTEM_RAM resources
Date: Tue, 23 Mar 2021 10:40:33 +0100	[thread overview]
Message-ID: <e4a088e3-fc26-cb59-8af8-a746932b108c@redhat.com> (raw)
In-Reply-To: <20210322160200.19633-2-david@redhat.com>

On 22.03.21 17:01, David Hildenbrand wrote:
> It used to be true that we can have busy system RAM only on the first level
> in the resourc tree. However, this is no longer holds for driver-managed
> system RAM (i.e., added via dax/kmem and virtio-mem), which gets added on
> lower levels.
> 
> We have two users of walk_system_ram_res(), which currently only
> consideres the first level:
> a) kernel/kexec_file.c:kexec_walk_resources() -- We properly skip
>     IORESOURCE_SYSRAM_DRIVER_MANAGED resources via
>     locate_mem_hole_callback(), so even after this change, we won't be
>     placing kexec images onto dax/kmem and virtio-mem added memory. No
>     change.
> b) arch/x86/kernel/crash.c:fill_up_crash_elf_data() -- we're currently
>     not adding relevant ranges to the crash elf info, resulting in them
>     not getting dumped via kdump.
> 
> This change fixes loading a crashkernel via kexec_file_load() and including
> dax/kmem and virtio-mem added System RAM in the crashdump on x86-64. Note
> that e.g,, arm64 relies on memblock data and, therefore, always considers
> all added System RAM already.
> 
> Let's find all busy IORESOURCE_SYSTEM_RAM resources, making the function
> behave like walk_system_ram_range().
> 
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> Cc: Signed-off-by: David Hildenbrand <david@redhat.com>

^ My copy-paste action when creating the cc list slipped in a duplicate 
  SO in all 3 patches. I can resend if desired.

-- 
Thanks,

David / dhildenb



  parent reply	other threads:[~2021-03-23  9:40 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-22 16:01 [PATCH v1 0/3] kernel/resource: make walk_system_ram_res() and walk_mem_res() search the whole tree David Hildenbrand
2021-03-22 16:01 ` [PATCH v1 1/3] kernel/resource: make walk_system_ram_res() find all busy IORESOURCE_SYSTEM_RAM resources David Hildenbrand
2021-03-22 16:10   ` Dan Williams
2021-03-23  9:40   ` David Hildenbrand [this message]
2021-03-23 11:07     ` Andy Shevchenko
2021-03-23 11:06   ` Andy Shevchenko
2021-03-23 11:25     ` David Hildenbrand
2021-03-23 14:33   ` Baoquan He
2021-03-24 11:18   ` Oscar Salvador
2021-03-24 11:28     ` David Hildenbrand
2021-03-22 16:01 ` [PATCH v1 2/3] kernel/resource: make walk_mem_res() find all busy IORESOURCE_MEM resources David Hildenbrand
2021-03-22 16:11   ` Dan Williams
2021-03-23 11:08   ` Andy Shevchenko
2021-03-23 11:26     ` David Hildenbrand
2021-03-22 16:02 ` [PATCH v1 3/3] kernel/resource: remove first_lvl / siblings_only logic David Hildenbrand
2021-03-22 16:12   ` Dan Williams
2021-03-23 11:11   ` Andy Shevchenko
2021-03-23 11:19     ` David Hildenbrand
2021-03-23 11:05 ` [PATCH v1 0/3] kernel/resource: make walk_system_ram_res() and walk_mem_res() search the whole tree Andy Shevchenko

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