Re: [PATCH] Add MCE support to KVM

[Gerd Hoffmann]

On 04/19/09 10:33, Avi Kivity wrote:
> Anthony Liguori wrote:
> > Why not introduce a new exit type for MSR reads/writes that aren't
> > handled by the kernel? You just need a bit on the return that
> > indicates whether to GPF because of an invalid MSR access.

Yes, please.

> Right now everything in the vcpu is emulated in the kernel. Everything
> else is emulated either in the kernel (irqchip) or in userspace. This
> makes things easier to understand, and is more future friendly if more
> cpu features become virtualized by hardware.
>
> While these are not compelling reasons, they at least lean the balance
> in favour of a kernel implementation.

The xen pv-on-hvm drivers use an msr to indicate "please place the 
hypercall page here".  Handling that in kernel isn't an option IMHO.

cheers,
  Gerd
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/