linux-kernel - Re: [PATCH v2 0/7] KVM: MMU: fast zap all shadow pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <514C2C11.1060004@linux.vnet.ibm.com>
Date:	Fri, 22 Mar 2013 18:01:53 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, gleb@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 0/7] KVM: MMU: fast zap all shadow pages

On 03/22/2013 10:11 AM, Xiao Guangrong wrote:

>> The modifications should be contained to kvm_mmu_get_page() mostly,
>> correct? (would also have to keep counters to increase SLAB freeing 
>> ratio, relative to number of outdated shadow pages).
> 
> Yes.
> 
>>
>> And then have codepaths that nuke shadow pages break from the spinlock,
> 
> I think this is not needed any more. We can let mmu_notify use the generation
> number to invalid all shadow pages, then we only need to free them after
> all vcpus down and mmu_notify unregistered - at this point, no lock contention,
> we can directly free them.

Sorry. This is wrong since after call ->release(), the memory will be
freed. zap-all-sp can not be delayed. Will think out a good way to handle this...


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/