linux-kernel - [ 17/37] KVM: VMX: Advertise CPU_BASED_RDPMC

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Message-Id: <20120817030246.408699559@decadent.org.uk>
Date:	Fri, 17 Aug 2012 04:03:00 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Stefan Bader <stefan.bader@...onical.com>,
	Avi Kivity <avi@...hat.com>
Subject: [ 17/37] KVM: VMX: Advertise CPU_BASED_RDPMC_EXITING for nested guests

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stefan Bader <stefan.bader@...onical.com>

Based on commit fee84b079d5ddee2247b5c1f53162c330c622902 upstream.

  Intercept RDPMC and forward it to the PMU emulation code.

Newer vmx support will only allow to load the kvm_intel module
if RDPMC_EXITING is supported. Even without the actual support
this part of the change is required on 3.2 hosts.

BugLink: http://bugs.launchpad.net/bugs/1031090
Signed-off-by: Stefan Bader <stefan.bader@...onical.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/kvm/vmx.c | 1 +
 1 file changed, 1 insertion(+)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1956,6 +1956,7 @@ static __init void nested_vmx_setup_ctls
 #endif
 		CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
 		CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING |
+		CPU_BASED_RDPMC_EXITING |
 		CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
 	/*
 	 * We can allow some features even when not supported by the


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