From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takuya Yoshikawa Subject: [RFC][PATCH 3/12] KVM: introduce wrapper functions to create and destroy dirty bitmaps Date: Tue, 4 May 2010 22:01:22 +0900 Message-ID: <20100504220122.0706ea6b.takuya.yoshikawa@gmail.com> References: <20100504215645.6448af8f.takuya.yoshikawa@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100504215645.6448af8f.takuya.yoshikawa-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: kvm-ppc-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Takuya Yoshikawa Cc: avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, mtosatti-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, agraf-l3A5Bk7waGM@public.gmane.org, yoshikawa.takuya-gVGce1chcLdL9jVzuh4AOg@public.gmane.org, fernando-gVGce1chcLdL9jVzuh4AOg@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kvm-ia64-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org, paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org, linuxppc-dev-mnsaURCQ41sdnm+yROfE0A@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-arch.vger.kernel.org We will change the vmalloc() and vfree() to do_mmap() and do_munmap() later. This patch makes it easy and cleanup the code. Signed-off-by: Takuya Yoshikawa Signed-off-by: Fernando Luis Vazquez Cao --- virt/kvm/kvm_main.c | 27 ++++++++++++++++++++------- 1 files changed, 20 insertions(+), 7 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7ab6312..3e3acad 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -435,6 +435,12 @@ out_err_nodisable: return ERR_PTR(r); } +static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + vfree(memslot->dirty_bitmap); + memslot->dirty_bitmap = NULL; +} + /* * Free any memory in @free but not in @dont. */ @@ -447,7 +453,7 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, vfree(free->rmap); if (!dont || free->dirty_bitmap != dont->dirty_bitmap) - vfree(free->dirty_bitmap); + kvm_destroy_dirty_bitmap(free); for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { @@ -458,7 +464,6 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, } free->npages = 0; - free->dirty_bitmap = NULL; free->rmap = NULL; } @@ -520,6 +525,18 @@ static int kvm_vm_release(struct inode *inode, struct file *filp) return 0; } +static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(memslot); + + memslot->dirty_bitmap = vmalloc(dirty_bytes); + if (!memslot->dirty_bitmap) + return -ENOMEM; + + memset(memslot->dirty_bitmap, 0, dirty_bytes); + return 0; +} + /* * Allocate some memory and give it an address in the guest physical address * space. @@ -653,12 +670,8 @@ skip_lpage: /* Allocate page dirty bitmap if needed */ if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { - unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new); - - new.dirty_bitmap = vmalloc(dirty_bytes); - if (!new.dirty_bitmap) + if (kvm_create_dirty_bitmap(&new) < 0) goto out_free; - memset(new.dirty_bitmap, 0, dirty_bytes); /* destroy any largepage mappings for dirty tracking */ if (old.npages) flush_shadow = 1; -- 1.7.0.4 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-px0-f174.google.com ([209.85.212.174]:43236 "EHLO mail-px0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758726Ab0EDNBZ (ORCPT ); Tue, 4 May 2010 09:01:25 -0400 Date: Tue, 4 May 2010 22:01:22 +0900 From: Takuya Yoshikawa Subject: [RFC][PATCH 3/12] KVM: introduce wrapper functions to create and destroy dirty bitmaps Message-ID: <20100504220122.0706ea6b.takuya.yoshikawa@gmail.com> In-Reply-To: <20100504215645.6448af8f.takuya.yoshikawa@gmail.com> References: <20100504215645.6448af8f.takuya.yoshikawa@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-arch-owner@vger.kernel.org List-ID: To: Takuya Yoshikawa Cc: avi@redhat.com, mtosatti@redhat.com, agraf@suse.de, yoshikawa.takuya@oss.ntt.co.jp, fernando@oss.ntt.co.jp, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm-ia64@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, benh@kernel.crashing.org, paulus@samba.org, linuxppc-dev@ozlabs.org, arnd@arndb.de, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Message-ID: <20100504130122.GUOE8k6tweGOcpEYk5fomX0CtuSOCq0tGyFeAKBfQTA@z> We will change the vmalloc() and vfree() to do_mmap() and do_munmap() later. This patch makes it easy and cleanup the code. Signed-off-by: Takuya Yoshikawa Signed-off-by: Fernando Luis Vazquez Cao --- virt/kvm/kvm_main.c | 27 ++++++++++++++++++++------- 1 files changed, 20 insertions(+), 7 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7ab6312..3e3acad 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -435,6 +435,12 @@ out_err_nodisable: return ERR_PTR(r); } +static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + vfree(memslot->dirty_bitmap); + memslot->dirty_bitmap = NULL; +} + /* * Free any memory in @free but not in @dont. */ @@ -447,7 +453,7 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, vfree(free->rmap); if (!dont || free->dirty_bitmap != dont->dirty_bitmap) - vfree(free->dirty_bitmap); + kvm_destroy_dirty_bitmap(free); for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { @@ -458,7 +464,6 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free, } free->npages = 0; - free->dirty_bitmap = NULL; free->rmap = NULL; } @@ -520,6 +525,18 @@ static int kvm_vm_release(struct inode *inode, struct file *filp) return 0; } +static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) +{ + unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(memslot); + + memslot->dirty_bitmap = vmalloc(dirty_bytes); + if (!memslot->dirty_bitmap) + return -ENOMEM; + + memset(memslot->dirty_bitmap, 0, dirty_bytes); + return 0; +} + /* * Allocate some memory and give it an address in the guest physical address * space. @@ -653,12 +670,8 @@ skip_lpage: /* Allocate page dirty bitmap if needed */ if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { - unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new); - - new.dirty_bitmap = vmalloc(dirty_bytes); - if (!new.dirty_bitmap) + if (kvm_create_dirty_bitmap(&new) < 0) goto out_free; - memset(new.dirty_bitmap, 0, dirty_bytes); /* destroy any largepage mappings for dirty tracking */ if (old.npages) flush_shadow = 1; -- 1.7.0.4