Re: [Qemu-devel] [PATCH] i386: turn off l3-cache property by default

[Eduardo Habkost]

On Wed, Nov 29, 2017 at 04:35:25PM +0300, Roman Kagan wrote:
> > On 2017/11/29 18:41, Eduardo Habkost wrote:
[...]
> > > IMO, the long term solution is to make Linux guests not misbehave
> > > when we stop lying about the L3 cache.  Maybe we could provide a
> > > "IPIs are expensive, please avoid them" hint in the KVM CPUID
> > > leaf?
> 
> We already have it, it's the hypervisor bit ;)  Seriously, I'm unaware
> of hypervisors where IPIs aren't expensive.

Sounds good enough to me, if we can convince the Linux kernel
maintainers that it should avoid IPIs under all hypervisors.

-- 
Eduardo