linux-kernel - [PATCH 3.16.y-ckt 128/180] KVM: x86: Fix MSR_IA32_BNDCFGS in msrs_to

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Message-Id: <1430991989-23170-129-git-send-email-luis.henriques@canonical.com>
Date:	Thu,  7 May 2015 10:45:37 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Nadav Amit <namit@...technion.ac.il>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 128/180] KVM: x86: Fix MSR_IA32_BNDCFGS in msrs_to_save

3.16.7-ckt11 -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>

Message-Id: <1428864435-4732-1-git-send-email-namit@...technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 arch/x86/kvm/x86.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a711a0d1ebc3..6018e319d7fb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5634,7 +5634,6 @@ 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);
@@ -7015,7 +7014,14 @@ void kvm_arch_hardware_disable(void *garbage)
 
 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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