From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 29 Jul 2015 10:31:15 +0000 (+0200)
Subject: KVM: x86: clean/fix memory barriers in irqchip_in_kernel
X-Git-Tag: omap-for-v4.3/fixes-merge-window~47^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=71ba994c94a81c37185ef2fb5190844286ba9aca;p=pandora-kernel.git

KVM: x86: clean/fix memory barriers in irqchip_in_kernel

The memory barriers are trying to protect against concurrent RCU-based
interrupt injection, but the IRQ routing table is not valid at the time
kvm->arch.vpic is written.  Fix this by writing kvm->arch.vpic last.
kvm_destroy_pic then need not set kvm->arch.vpic to NULL; modify it
to take a struct kvm_pic* and reuse it if the IOAPIC creation fails.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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