[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <87a7qfpfnr.fsf@vitty.brq.redhat.com>
Date: Wed, 25 Jul 2018 16:13:12 +0200
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org,
Radim Krčmář <rkrcmar@...hat.com>,
Roman Kagan <rkagan@...tuozzo.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Stephen Hemminger <sthemmin@...rosoft.com>,
"Michael Kelley \(EOSG\)" <Michael.H.Kelley@...rosoft.com>,
Mohammed Gamal <mmorsy@...hat.com>,
Cathy Avery <cavery@...hat.com>, linux-kernel@...r.kernel.org,
Jim Mattson <jmattson@...gle.com>,
Liran Alon <liran.alon@...cle.com>
Subject: Re: [PATCH v2 6/6] KVM: nVMX: optimize prepare_vmcs02{,_full} for Enlightened VMCS case
Paolo Bonzini <pbonzini@...hat.com> writes:
> On 25/07/2018 15:26, Vitaly Kuznetsov wrote:
>
>> The other place where we set dirty_vmcs12 is the newly introduced
>> vmx_set_nested_state() but I think I'm going to add support for eVMCS
>> there later and just return something like -ENOTSUPP for now. Too many
>> people work on nested simultaneously :-)
>
> Hmm, I think that means you have to put the clean fields in the
> vmx_nested struct. Then it's really easy in vmx_set_nested_state to
> clear all the clean bits. Touching memory in vmx_set_nested_state is...
> *puts on sunglasses* a touchy subject (see comment in kvm/queue's
> enter_vmx_non_root_mode).
>
Not only clean fields, in case we can't touch memory in
vmx_set_nested_state I guess we'll need to cache the whole eVMCS, just
like we save cached_shadow_vmcs12. Anyway, let's eat the elephant one
bite at a time :-)
--
Vitaly
Powered by blists - more mailing lists