[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20211119134739.20218-13-chao.p.peng@linux.intel.com>
Date: Fri, 19 Nov 2021 21:47:38 +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 12/13] KVM: Introduce kvm_memfd_fallocate_range
It reuses the same code for kvm_memfd_invalidate_range, except using
kvm_map_gfn_range as its handler.
Signed-off-by: Yu Zhang <yu.c.zhang@...ux.intel.com>
Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
---
include/linux/kvm_host.h | 2 ++
virt/kvm/kvm_main.c | 28 +++++++++++++++++++++++++---
2 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d841ed877b4b..f1d7856be05b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1887,5 +1887,7 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
unsigned long start, unsigned long end);
+int kvm_memfd_fallocate_range(struct kvm *kvm, struct inode *inode,
+ unsigned long start, unsigned long end);
#endif
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 492c1a99ec63..7eaafc0ae6ab 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -828,8 +828,10 @@ static int kvm_init_mmu_notifier(struct kvm *kvm)
return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
}
-int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
- unsigned long start, unsigned long end)
+int kvm_memfd_handle_range(struct kvm *kvm, struct inode *inode,
+ unsigned long start, unsigned long end,
+ gfn_handler_t handler)
+
{
int ret;
const struct kvm_useraddr_range useraddr_range = {
@@ -837,7 +839,7 @@ int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
.end = end,
.inode = inode,
.pte = __pte(0),
- .handler = kvm_unmap_gfn_range,
+ .handler = handler,
.on_lock = (void *)kvm_null_fn,
.flush_on_ret = true,
.may_block = false,
@@ -858,6 +860,20 @@ int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
return ret;
}
+int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
+ unsigned long start, unsigned long end)
+{
+ return kvm_memfd_handle_range(kvm, inode, start, end,
+ kvm_unmap_gfn_range);
+}
+
+int kvm_memfd_fallocate_range(struct kvm *kvm, struct inode *inode,
+ unsigned long start, unsigned long end)
+{
+ return kvm_memfd_handle_range(kvm, inode, start, end,
+ kvm_map_gfn_range);
+}
+
#else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
static int kvm_init_mmu_notifier(struct kvm *kvm)
@@ -871,6 +887,12 @@ int kvm_memfd_invalidate_range(struct kvm *kvm, struct inode *inode,
return 0;
}
+int kvm_memfd_fallocate_range(struct kvm *kvm, struct inode *inode,
+ unsigned long start, unsigned long end)
+{
+ return 0;
+}
+
#endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
#ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
--
2.17.1
Powered by blists - more mailing lists