Re: [Xen-devel] [PATCH v1] x86/mm: Supresses vm_events caused by page-walks

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 30.10.2017 18:01, Tamas K Lengyel wrote:
> On Mon, Oct 30, 2017 at 4:32 AM, Alexandru Isaila
> <aisaila@xxxxxxxxxxxxxxx> wrote:
>> This patch is adding a way to enable/disable nested pagefault
>> events. It introduces the xc_monitor_nested_pagefault function
>> and adds the nested_pagefault_disabled in the monitor structure.
>> This is needed by the introspection so it will only get gla
>> faults and not get spammed with other faults.
>> In p2m_set_ad_bits the v->arch.sse_pg_dirty.eip and
>> v->arch.sse_pg_dirty.gla are used to mark that this is the
>> second time a fault occurs and the dirty bit is set.
> 
> Could you describe under what conditions do you get these other faults?

Hey Tamas, the whole story is at page 8 of this document:

https://www.researchgate.net/publication/281835515_Proposed_Processor_Extensions_for_Significant_Speedup_of_Hypervisor_Memory_Introspection


Thanks,
Razvan

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