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Message-Id: <20211119134739.20218-14-chao.p.peng@linux.intel.com>
Date: Fri, 19 Nov 2021 21:47:39 +0800
From: Chao Peng <chao.p.peng@...ux.intel.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
qemu-devel@...gnu.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Jonathan Corbet <corbet@....net>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
Hugh Dickins <hughd@...gle.com>,
Jeff Layton <jlayton@...nel.org>,
"J . Bruce Fields" <bfields@...ldses.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Yu Zhang <yu.c.zhang@...ux.intel.com>,
Chao Peng <chao.p.peng@...ux.intel.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
luto@...nel.org, john.ji@...el.com, susie.li@...el.com,
jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com,
david@...hat.com
Subject: [RFC v2 PATCH 13/13] KVM: Enable memfd based page invalidation/fallocate
Since the memory backing store does not get notified when VM is
destroyed so need check if VM is still live in these callbacks.
Signed-off-by: Yu Zhang <yu.c.zhang@...ux.intel.com>
Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
---
virt/kvm/memfd.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/virt/kvm/memfd.c b/virt/kvm/memfd.c
index bd930dcb455f..bcfdc685ce22 100644
--- a/virt/kvm/memfd.c
+++ b/virt/kvm/memfd.c
@@ -12,16 +12,38 @@
#include <linux/memfd.h>
const static struct guest_mem_ops *memfd_ops;
+static bool vm_is_dead(struct kvm *vm)
+{
+ struct kvm *kvm;
+
+ list_for_each_entry(kvm, &vm_list, vm_list) {
+ if (kvm == vm)
+ return false;
+ }
+
+ return true;
+}
+
static void memfd_invalidate_page_range(struct inode *inode, void *owner,
pgoff_t start, pgoff_t end)
{
//!!!We can get here after the owner no longer exists
+ if (vm_is_dead(owner))
+ return;
+
+ kvm_memfd_invalidate_range(owner, inode, start >> PAGE_SHIFT,
+ end >> PAGE_SHIFT);
}
static void memfd_fallocate(struct inode *inode, void *owner,
pgoff_t start, pgoff_t end)
{
//!!!We can get here after the owner no longer exists
+ if (vm_is_dead(owner))
+ return;
+
+ kvm_memfd_fallocate_range(owner, inode, start >> PAGE_SHIFT,
+ end >> PAGE_SHIFT);
}
static const struct guest_ops memfd_notifier = {
--
2.17.1
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