From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Sat, 4 Jan 2014 17:47:19 +0000 (+0100)
Subject: KVM: nVMX: Leave VMX mode on clearing of feature control MSR
X-Git-Tag: v3.14-rc1~127^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=42124925c1f580068661bebd963d7c102175a8a9;p=pandora-kernel.git

KVM: nVMX: Leave VMX mode on clearing of feature control MSR

When userspace sets MSR_IA32_FEATURE_CONTROL to 0, make sure we leave
root and non-root mode, fully disabling VMX. The register state of the
VCPU is undefined after this step, so userspace has to set it to a
proper state afterward.

This enables to reboot a VM while it is running some hypervisor code.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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