From 5a4f55cde81f1633cb7ae9f0963b722e47acdc36 Mon Sep 17 00:00:00 2001
From: Eugene Korenevsky <ekorenevsky@gmail.com>
Date: Sun, 29 Mar 2015 23:56:12 +0300
Subject: [PATCH] KVM: x86: cache maxphyaddr CPUID leaf in struct kvm_vcpu

cpuid_maxphyaddr(), which performs lot of memory accesses is called
extensively across KVM, especially in nVMX code.

This patch adds a cached value of maxphyaddr to vcpu.arch to reduce the
pressure onto CPU cache and simplify the code of cpuid_maxphyaddr()
callers. The cached value is initialized in kvm_arch_vcpu_init() and
reloaded every time CPUID is updated by usermode. It is obvious that
these reloads occur infrequently.

Signed-off-by: Eugene Korenevsky <ekorenevsky@gmail.com>
Message-Id: <20150329205612.GA1223@gnote>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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