qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH 0/2] virtio-pci: fix abort when fail to allocate


From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 0/2] virtio-pci: fix abort when fail to allocate ioeventfd
Date: Wed, 14 Mar 2012 11:22:30 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1

On 03/13/2012 12:42 PM, Amos Kong wrote:
> Boot up guest with 232 virtio-blk disk, qemu will abort for fail to
> allocate ioeventfd. This patchset changes kvm_has_many_ioeventfds(),
> and check if available ioeventfd exists. If not, virtio-pci will
> fallback to userspace, and don't use ioeventfd for io notification.

How about an alternative way of solving this, within the memory core:
trap those writes in qemu and write to the ioeventfd yourself.  This way
ioeventfds work even without kvm:


  core: create eventfd
  core: install handler for memory address that writes to ioeventfd
  kvm (optional): install kernel handler for ioeventfd

even if the third step fails, the ioeventfd still works, it's just slower.

-- 
error compiling committee.c: too many arguments to function




reply via email to

[Prev in Thread] Current Thread [Next in Thread]