linux-kernel - [PATCH 4.0 019/220] KVM: x86: Fix MSR_IA32_BNDCFGS in msrs_to

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Message-Id: <20150502185855.217798356@linuxfoundation.org>
Date:	Sat,  2 May 2015 20:58:54 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Nadav Amit <namit@...technion.ac.il>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: [PATCH 4.0 019/220] KVM: x86: Fix MSR_IA32_BNDCFGS in msrs_to_save

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

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

From: Nadav Amit <namit@...technion.ac.il>

commit 9e9c3fe40bcd28e3f98f0ad8408435f4503f2781 upstream.

kvm_init_msr_list is currently called before hardware_setup. As a result,
vmx_mpx_supported always returns false when kvm_init_msr_list checks whether to
save MSR_IA32_BNDCFGS.

Move kvm_init_msr_list after vmx_hardware_setup is called to fix this issue.

Signed-off-by: Nadav Amit <namit@...technion.ac.il>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Message-Id: <1428864435-4732-1-git-send-email-namit@...technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

---
 arch/x86/kvm/x86.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5775,7 +5775,6 @@ int kvm_arch_init(void *opaque)
 	kvm_set_mmio_spte_mask();
 
 	kvm_x86_ops = ops;
-	kvm_init_msr_list();
 
 	kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
 			PT_DIRTY_MASK, PT64_NX_MASK, 0);
@@ -7209,7 +7208,14 @@ void kvm_arch_hardware_disable(void)
 
 int kvm_arch_hardware_setup(void)
 {
-	return kvm_x86_ops->hardware_setup();
+	int r;
+
+	r = kvm_x86_ops->hardware_setup();
+	if (r != 0)
+		return r;
+
+	kvm_init_msr_list();
+	return 0;
 }
 
 void kvm_arch_hardware_unsetup(void)


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