linux-kernel - [PATCH 4.9 073/104] kvm, mm: account kvm related kmem slabs to kmemcg

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Date:   Fri, 22 Dec 2017 09:46:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shakeel Butt <shakeelb@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 073/104] kvm, mm: account kvm related kmem slabs to kmemcg

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

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

From: Shakeel Butt <shakeelb@...gle.com>


[ Upstream commit 46bea48ac241fe0b413805952dda74dd0c09ba8b ]

The kvm slabs can consume a significant amount of system memory
and indeed in our production environment we have observed that
a lot of machines are spending significant amount of memory that
can not be left as system memory overhead. Also the allocations
from these slabs can be triggered directly by user space applications
which has access to kvm and thus a buggy application can leak
such memory. So, these caches should be accounted to kmemcg.

Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kvm/mmu.c  |    4 ++--
 virt/kvm/kvm_main.c |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5052,13 +5052,13 @@ int kvm_mmu_module_init(void)
 {
 	pte_list_desc_cache = kmem_cache_create("pte_list_desc",
 					    sizeof(struct pte_list_desc),
-					    0, 0, NULL);
+					    0, SLAB_ACCOUNT, NULL);
 	if (!pte_list_desc_cache)
 		goto nomem;
 
 	mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header",
 						  sizeof(struct kvm_mmu_page),
-						  0, 0, NULL);
+						  0, SLAB_ACCOUNT, NULL);
 	if (!mmu_page_header_cache)
 		goto nomem;
 
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3904,7 +3904,7 @@ int kvm_init(void *opaque, unsigned vcpu
 	if (!vcpu_align)
 		vcpu_align = __alignof__(struct kvm_vcpu);
 	kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
-					   0, NULL);
+					   SLAB_ACCOUNT, NULL);
 	if (!kvm_vcpu_cache) {
 		r = -ENOMEM;
 		goto out_free_3;