Re: [PATCH V2 1/2] efi/unaccepted: Do not let /proc/vmcore try to access unaccepted memory

[Adrian Hunter]

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.