Patch "KVM: VMX: use cmpxchg64" has been added to the 4.9-stable tree

Patch "KVM: VMX: use cmpxchg64" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    KVM: VMX: use cmpxchg64

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-vmx-use-cmpxchg64.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From c0a1666bcb2a33e84187a15eabdcd54056be9a97 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Thu, 28 Sep 2017 17:58:41 +0200
Subject: KVM: VMX: use cmpxchg64

From: Paolo Bonzini <pbonzini@redhat.com>

commit c0a1666bcb2a33e84187a15eabdcd54056be9a97 upstream.

This fixes a compilation failure on 32-bit systems.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/kvm/vmx.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2203,8 +2203,8 @@ static void vmx_vcpu_pi_load(struct kvm_
 			new.ndst = (dest << 8) & 0xFF00;
 
 		new.sn = 0;
-	} while (cmpxchg(&pi_desc->control, old.control,
-			new.control) != old.control);
+	} while (cmpxchg64(&pi_desc->control, old.control,
+			   new.control) != old.control);
 }
 
 static void decache_tsc_multiplier(struct vcpu_vmx *vmx)
@@ -11039,8 +11039,8 @@ static void __pi_post_block(struct kvm_v
 
 		/* set 'NV' to 'notification vector' */
 		new.nv = POSTED_INTR_VECTOR;
-	} while (cmpxchg(&pi_desc->control, old.control,
-			new.control) != old.control);
+	} while (cmpxchg64(&pi_desc->control, old.control,
+			   new.control) != old.control);
 
 	if (!WARN_ON_ONCE(vcpu->pre_pcpu == -1)) {
 		spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->pre_pcpu));
@@ -11109,8 +11109,8 @@ static int pi_pre_block(struct kvm_vcpu
 
 		/* set 'NV' to 'wakeup vector' */
 		new.nv = POSTED_INTR_WAKEUP_VECTOR;
-	} while (cmpxchg(&pi_desc->control, old.control,
-			new.control) != old.control);
+	} while (cmpxchg64(&pi_desc->control, old.control,
+			   new.control) != old.control);
 
 	/* We should not block the vCPU if an interrupt is posted for it.  */
 	if (pi_test_on(pi_desc) == 1)


Patches currently in stable-queue which might be from pbonzini@redhat.com are

queue-4.9/kvm-vmx-do-not-change-sn-bit-in-vmx_update_pi_irte.patch
queue-4.9/kvm-vmx-simplify-and-fix-vmx_vcpu_pi_load.patch
queue-4.9/kvm-vmx-avoid-double-list-add-with-vt-d-posted-interrupts.patch
queue-4.9/kvm-vmx-use-cmpxchg64.patch
queue-4.9/kvm-nvmx-don-t-allow-l2-to-access-the-hardware-cr8.patch
queue-4.9/kvm-x86-handle-async-pf-in-rcu-read-side-critical-sections.patch
queue-4.9/kvm-vmx-extract-__pi_post_block.patch
queue-4.9/kvm-vmx-do-not-bug-on-out-of-bounds-guest-irq.patch
queue-4.9/kvm-vmx-remove-warn_on_once-in-kvm_vcpu_trigger_posted_interrupt.patch