Re: Q: What is the struct kvm srcu protecting?

[Gleb Natapov <gleb@redhat.com>]

On Fri, May 03, 2013 at 10:21:09AM -0700, David Daney wrote:
> On 05/03/2013 03:51 AM, Gleb Natapov wrote:
> >Hi David,
> >
> >On Thu, May 02, 2013 at 10:48:36PM -0300, Marcelo Tosatti wrote:
> >>On Thu, May 02, 2013 at 11:22:52AM -0700, David Daney wrote:
> >>>Hi,
> >>>
> >>>I am working on the MIPS KVM port, and am trying to figure out under
> >>>which circumstances do I need to srcu_read_lock()/srcu_read_unlock()
> >>>the kvm->srcu.
> >>
> >Is your work somehow related to the work of Sanjay Lal that can be found
> >here: https://git.linux-mips.org/?p=ralf/upstream-sfr.git;a=summary?
> >
> 
> It is related in that a single asm/uaip/kvm.h must be shared between
> the implementations.  It differs in that it is based on the MIPS-VZ
> hardware virtualization feature, where as Sanjay's code is a pure
> software solution.
> 
> If possible some code might be shared between the two, but it may
> end up looking somewhat like the x86 implementation where there are
> separate VMX and SVM implementations.
> 
Sanjay code already has such design and the reason he gave for it was upcoming
HW virtualization support.

--
			Gleb.