Patch "KVM: nVMX: kmap() can't fail" has been added to the 4.9-stable tree

Patch "KVM: nVMX: kmap() can't fail" 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: nVMX: kmap() can't fail

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-nvmx-kmap-can-t-fail.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 42cf014d38d8822cce63703a467e00f65d000952 Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Wed, 25 Jan 2017 11:58:57 +0100
Subject: KVM: nVMX: kmap() can't fail

From: David Hildenbrand <david@redhat.com>

commit 42cf014d38d8822cce63703a467e00f65d000952 upstream.

kmap() can't fail, therefore it will always return a valid pointer. Let's
just get rid of the unnecessary checks.

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

---
 arch/x86/kvm/vmx.c |    9 ---------
 1 file changed, 9 deletions(-)

--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4756,10 +4756,6 @@ static int vmx_complete_nested_posted_in
 			return 0;
 
 		vapic_page = kmap(vmx->nested.virtual_apic_page);
-		if (!vapic_page) {
-			WARN_ON(1);
-			return -ENOMEM;
-		}
 		__kvm_apic_update_irr(vmx->nested.pi_desc->pir, vapic_page);
 		kunmap(vmx->nested.virtual_apic_page);
 
@@ -9584,11 +9580,6 @@ static inline bool nested_vmx_merge_msr_
 	if (!page)
 		return false;
 	msr_bitmap_l1 = (unsigned long *)kmap(page);
-	if (!msr_bitmap_l1) {
-		nested_release_page_clean(page);
-		WARN_ON(1);
-		return false;
-	}
 
 	memset(msr_bitmap_l0, 0xff, PAGE_SIZE);
 


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

queue-4.9/kvm-nvmx-eliminate-vmcs02-pool.patch
queue-4.9/kvm-nvmx-vmx_complete_nested_posted_interrupt-can-t-fail.patch
queue-4.9/kvm-nvmx-kmap-can-t-fail.patch