linux-kernel - Re: [PATCH 1/2] KVM: nVMX: Fix nested vmexit ack intr before load vmcs01

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: <1407182196.2571.14.camel@buesod1.americas.hpqcorp.net>
Date:	Mon, 04 Aug 2014 12:56:36 -0700
From:	Davidlohr Bueso <davidlohr@...com>
To:	Wanpeng Li <wanpeng.li@...ux.intel.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, Bandan Das <bsd@...hat.com>,
	Zhang Yang <yang.z.zhang@...el.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, freyes@...e.com
Subject: Re: [PATCH 1/2] KVM: nVMX: Fix nested vmexit ack intr before load
 vmcs01

On Fri, 2014-08-01 at 16:12 +0800, Wanpeng Li wrote:
> External interrupt will cause L1 vmexit w/ reason external interrupt when L2 is 
> running. Then L1 will pick up the interrupt through vmcs12 if L1 set the ack 
> interrupt bit. Commit 77b0f5d (KVM: nVMX: Ack and write vector info to intr_info
> if L1 asks us to)

So being that 77b0f5d is in 3.15, we need it for -stable.

>  get intr that belongs to L1 before load vmcs01 which is wrong, 
> especially this lead to the obvious L1 ack APICv behavior weired since APICv 
> is for L1 instead of L2. This patch fix it by ack intr after load vmcs01.
> 
> Signed-off-by: Wanpeng Li <wanpeng.li@...ux.intel.com>

It strikes me that this fixes Felipe's issue:
http://paste.opensuse.org/view/raw/78752586




--
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/