From: Adrian Hunter <adrian.hunter@intel.com>
To: David Hildenbrand <david@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Borislav Petkov <bp@alien8.de>,
Andrew Morton <akpm@linux-foundation.org>,
Ard Biesheuvel <ardb@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Mike Rapoport <rppt@linux.ibm.com>,
Lorenzo Stoakes <lstoakes@gmail.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
Dave Young <dyoung@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-coco@lists.linux.dev,
linux-efi@vger.kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH V2 1/2] efi/unaccepted: Do not let /proc/vmcore try to access unaccepted memory
Date: Tue, 12 Sep 2023 10:47:49 +0300 [thread overview]
Message-ID: <1c736ca3-36e2-3225-2f98-e51149c468ef@intel.com> (raw)
In-Reply-To: <96f124d6-c1f2-adb3-1d3b-8329e85ff099@redhat.com>
On 12/09/23 10:19, David Hildenbrand wrote:
> On 11.09.23 13:21, Adrian Hunter wrote:
>> Support for unaccepted memory was added recently, refer commit dcdfdd40fa82
>> ("mm: Add support for unaccepted memory"), whereby a virtual machine may
>> need to accept memory before it can be used.
>>
>> Do not let /proc/vmcore try to access unaccepted memory because it can
>> cause the guest to fail.
>
> Oh, hold on. What are the actual side effects of this?
>
> Once we're in the kdump kernel, any guest is already dead. So failing a guest doesn't apply, no?
>
Unaccepted Memory is used by virtual machines. In this case the guest
has kexec'ed to a dump-capture kernel, so the virtual machine is still
alive and running the dump-capture kernel.
next prev parent reply other threads:[~2023-09-12 7:48 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-11 11:21 [PATCH V2 0/2] Do not " Adrian Hunter
2023-09-11 11:21 ` [PATCH V2 1/2] efi/unaccepted: Do not let /proc/vmcore " Adrian Hunter
2023-09-12 7:18 ` David Hildenbrand
2023-09-12 7:19 ` David Hildenbrand
2023-09-12 7:47 ` Adrian Hunter [this message]
2023-09-12 7:50 ` David Hildenbrand
2023-09-11 11:21 ` [PATCH V2 2/2] proc/kcore: Do not " Adrian Hunter
2023-09-12 7:13 ` David Hildenbrand
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