From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH] KVM: x86: fix vcpu->mmio_fragments overflow
Date: Mon, 22 Oct 2012 14:18:48 +0200
Message-ID: <508539A8.40404@redhat.com>
References: <5081033C.4060503@linux.vnet.ibm.com> <20121022091615.GG29310@redhat.com> <50852972.305@linux.vnet.ibm.com> <20121022112314.GO29310@redhat.com> <50852F9C.9020808@siemens.com> <20121022114311.GQ29310@redhat.com> <508531E1.2030307@siemens.com>
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Cc: Gleb Natapov <gleb@redhat.com>,
	Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
To: Jan Kiszka <jan.kiszka@siemens.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <508531E1.2030307@siemens.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On 10/22/2012 01:45 PM, Jan Kiszka wrote:

>> Indeed. git pull, recheck and call for kvm_flush_coalesced_mmio_buffer()
>> is gone. So this will break new userspace, not old. By global you mean
>> shared between devices (or memory regions)?
> 
> Yes. We only have a single ring per VM, so we cannot flush multi-second
> VGA access separately from other devices. In theory solvable by
> introducing per-region rings that can be driven separately.

But in practice unneeded.  Real time VMs can disable coalescing and not
use planar VGA modes.


-- 
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