[PATCH RFC 0/5] Eliminate double-copying of FP/VMX/VSX state

From: Paul Mackerras <paulus@samba.org>
To: Alexander Graf <agraf@suse.de>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: kvm-ppc@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH RFC 0/5] Eliminate double-copying of FP/VMX/VSX state
Date: Wed, 7 Aug 2013 16:52:20 +1000	[thread overview]
Message-ID: <20130807065220.GF31007@iris.ozlabs.ibm.com> (raw)

At present, PR KVM and BookE KVM does multiple copies of FP and
related state because of the way that they use the arrays in the
thread_struct as an intermediate staging post for the state.  They do
this so that they can use the existing system functions for loading
and saving state, and so that they can keep guest state in the CPU
registers while executing general kernel code.

This patch series reorganizes things so that KVM and the main kernel
use the same representation for FP/VMX/VSX state, and so that guest
state can be loaded/save directly from/to the vcpu struct instead of
having to go via the thread_struct.  This simplifies things and should
be a little faster.

This series is against Alex Graf's kvm-ppc-queue branch plus my recent
series of 23 patches to make PR and HV KVM coexist.

Paul.