From: Marcelo Tosatti <mtosatti@redhat.com>
To: kvm@vger.kernel.org
Cc: avi@redhat.com, Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch 04/10] KVM: split kvm_arch_set_memory_region into prepare and commit
Date: Mon, 21 Sep 2009 20:37:15 -0300 [thread overview]
Message-ID: <20090921234124.294262283@amt.cnet> (raw)
In-Reply-To: 20090921233711.213665413@amt.cnet
[-- Attachment #1: prepare-commit-memory-region --]
[-- Type: text/plain, Size: 6504 bytes --]
Required for SRCU convertion later.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Index: kvm-slotslock/arch/ia64/kvm/kvm-ia64.c
===================================================================
--- kvm-slotslock.orig/arch/ia64/kvm/kvm-ia64.c
+++ kvm-slotslock/arch/ia64/kvm/kvm-ia64.c
@@ -1576,15 +1576,14 @@ out:
return r;
}
-int kvm_arch_set_memory_region(struct kvm *kvm,
- struct kvm_userspace_memory_region *mem,
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ struct kvm_memory_slot *memslot,
struct kvm_memory_slot old,
int user_alloc)
{
unsigned long i;
unsigned long pfn;
- int npages = mem->memory_size >> PAGE_SHIFT;
- struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
+ int npages = memslot->npages;
unsigned long base_gfn = memslot->base_gfn;
if (base_gfn + npages > (KVM_MAX_MEM_SIZE >> PAGE_SHIFT))
@@ -1608,6 +1607,14 @@ int kvm_arch_set_memory_region(struct kv
return 0;
}
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem,
+ struct kvm_memory_slot old,
+ int user_alloc)
+{
+ return;
+}
+
void kvm_arch_flush_shadow(struct kvm *kvm)
{
kvm_flush_remote_tlbs(kvm);
Index: kvm-slotslock/arch/s390/kvm/kvm-s390.c
===================================================================
--- kvm-slotslock.orig/arch/s390/kvm/kvm-s390.c
+++ kvm-slotslock/arch/s390/kvm/kvm-s390.c
@@ -680,10 +680,10 @@ long kvm_arch_vcpu_ioctl(struct file *fi
}
/* Section: memory related */
-int kvm_arch_set_memory_region(struct kvm *kvm,
- struct kvm_userspace_memory_region *mem,
- struct kvm_memory_slot old,
- int user_alloc)
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem,
+ struct kvm_memory_slot old,
+ int user_alloc)
{
int i;
struct kvm_vcpu *vcpu;
@@ -710,14 +710,20 @@ int kvm_arch_set_memory_region(struct kv
if (!user_alloc)
return -EINVAL;
+ return 0;
+}
+
+int kvm_arch_commit_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem,
+ struct kvm_memory_slot old,
+ int user_alloc)
+{
/* request update of sie control block for all available vcpus */
kvm_for_each_vcpu(i, vcpu, kvm) {
if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
continue;
kvm_s390_inject_sigp_stop(vcpu, ACTION_RELOADVCPU_ON_STOP);
}
-
- return 0;
}
void kvm_arch_flush_shadow(struct kvm *kvm)
Index: kvm-slotslock/arch/x86/kvm/x86.c
===================================================================
--- kvm-slotslock.orig/arch/x86/kvm/x86.c
+++ kvm-slotslock/arch/x86/kvm/x86.c
@@ -4872,13 +4872,12 @@ void kvm_arch_destroy_vm(struct kvm *kvm
kfree(kvm);
}
-int kvm_arch_set_memory_region(struct kvm *kvm,
- struct kvm_userspace_memory_region *mem,
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ struct kvm_memory_slot *memslot,
struct kvm_memory_slot old,
int user_alloc)
{
- int npages = mem->memory_size >> PAGE_SHIFT;
- struct kvm_memory_slot *memslot = &kvm->memslots->memslots[mem->slot];
+ int npages = memslot->npages;
/*To keep backward compatibility with older userspace,
*x86 needs to hanlde !user_alloc case.
@@ -4898,26 +4897,35 @@ int kvm_arch_set_memory_region(struct kv
if (IS_ERR((void *)userspace_addr))
return PTR_ERR((void *)userspace_addr);
- /* set userspace_addr atomically for kvm_hva_to_rmapp */
- spin_lock(&kvm->mmu_lock);
memslot->userspace_addr = userspace_addr;
- spin_unlock(&kvm->mmu_lock);
- } else {
- if (!old.user_alloc && old.rmap) {
- int ret;
-
- down_write(¤t->mm->mmap_sem);
- ret = do_munmap(current->mm, old.userspace_addr,
- old.npages * PAGE_SIZE);
- up_write(¤t->mm->mmap_sem);
- if (ret < 0)
- printk(KERN_WARNING
- "kvm_vm_ioctl_set_memory_region: "
- "failed to munmap memory\n");
- }
}
}
+
+ return 0;
+}
+
+void kvm_arch_commit_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem,
+ struct kvm_memory_slot old,
+ int user_alloc)
+{
+
+ int npages = mem->memory_size >> PAGE_SHIFT;
+
+ if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
+ int ret;
+
+ down_write(¤t->mm->mmap_sem);
+ ret = do_munmap(current->mm, old.userspace_addr,
+ old.npages * PAGE_SIZE);
+ up_write(¤t->mm->mmap_sem);
+ if (ret < 0)
+ printk(KERN_WARNING
+ "kvm_vm_ioctl_set_memory_region: "
+ "failed to munmap memory\n");
+ }
+
spin_lock(&kvm->mmu_lock);
if (!kvm->arch.n_requested_mmu_pages) {
unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
@@ -4926,8 +4934,6 @@ int kvm_arch_set_memory_region(struct kv
kvm_mmu_slot_remove_write_access(kvm, mem->slot);
spin_unlock(&kvm->mmu_lock);
-
- return 0;
}
void kvm_arch_flush_shadow(struct kvm *kvm)
Index: kvm-slotslock/include/linux/kvm_host.h
===================================================================
--- kvm-slotslock.orig/include/linux/kvm_host.h
+++ kvm-slotslock/include/linux/kvm_host.h
@@ -254,7 +254,11 @@ int kvm_set_memory_region(struct kvm *kv
int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
int user_alloc);
-int kvm_arch_set_memory_region(struct kvm *kvm,
+int kvm_arch_prepare_memory_region(struct kvm *kvm,
+ struct kvm_memory_slot *memslot,
+ struct kvm_memory_slot old,
+ int user_alloc);
+void kvm_arch_commit_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
struct kvm_memory_slot old,
int user_alloc);
Index: kvm-slotslock/virt/kvm/kvm_main.c
===================================================================
--- kvm-slotslock.orig/virt/kvm/kvm_main.c
+++ kvm-slotslock/virt/kvm/kvm_main.c
@@ -644,6 +644,10 @@ skip_lpage:
if (!npages)
kvm_arch_flush_shadow(kvm);
+ r = kvm_arch_prepare_memory_region(kvm, &new, old, user_alloc);
+ if (r)
+ goto out_free;
+
spin_lock(&kvm->mmu_lock);
if (mem->slot >= kvm->memslots->nmemslots)
kvm->memslots->nmemslots = mem->slot + 1;
@@ -651,13 +655,7 @@ skip_lpage:
*memslot = new;
spin_unlock(&kvm->mmu_lock);
- r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
- if (r) {
- spin_lock(&kvm->mmu_lock);
- *memslot = old;
- spin_unlock(&kvm->mmu_lock);
- goto out_free;
- }
+ kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
kvm_free_physmem_slot(&old, npages ? &new : NULL);
/* Slot deletion case: we have to update the current slot */
next prev parent reply other threads:[~2009-09-21 23:42 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-21 23:37 [patch 00/10] RFC: switch vcpu context to use SRCU Marcelo Tosatti
2009-09-21 23:37 ` [patch 01/10] KVM: modify memslots layout in struct kvm Marcelo Tosatti
2009-09-21 23:37 ` [patch 02/10] KVM: modify alias layout in x86s struct kvm_arch Marcelo Tosatti
2009-09-21 23:37 ` [patch 03/10] KVM: switch dirty_log to mmu_lock protection Marcelo Tosatti
2009-09-22 6:37 ` Avi Kivity
2009-09-22 12:44 ` Marcelo Tosatti
2009-09-22 12:52 ` Avi Kivity
2009-09-21 23:37 ` Marcelo Tosatti [this message]
2009-09-22 6:40 ` [patch 04/10] KVM: split kvm_arch_set_memory_region into prepare and commit Avi Kivity
2009-09-21 23:37 ` [patch 05/10] KVM: introduce gfn_to_pfn_memslot Marcelo Tosatti
2009-09-21 23:37 ` [patch 06/10] KVM: use gfn_to_pfn_memslot in kvm_iommu_map_pages Marcelo Tosatti
2009-09-21 23:37 ` [patch 07/10] KVM: introduce kvm->srcu and convert kvm_set_memory_region to SRCU update Marcelo Tosatti
2009-09-22 6:59 ` Avi Kivity
2009-09-22 16:16 ` Marcelo Tosatti
2009-09-22 10:40 ` Fernando Carrijo
2009-09-22 12:55 ` Marcelo Tosatti
2009-09-24 14:06 ` Marcelo Tosatti
2009-09-24 17:28 ` Paul E. McKenney
2009-09-24 18:05 ` Marcelo Tosatti
2009-09-25 15:05 ` Avi Kivity
2009-09-21 23:37 ` [patch 08/10] KVM: x86: switch kvm_set_memory_alias " Marcelo Tosatti
2009-09-22 7:04 ` Avi Kivity
2009-09-21 23:37 ` [patch 09/10] KVM: convert io_bus to SRCU Marcelo Tosatti
2009-09-21 23:37 ` [patch 10/10] KVM: switch vcpu context to use SRCU Marcelo Tosatti
2009-09-22 7:07 ` Avi Kivity
2009-09-22 7:09 ` [patch 00/10] RFC: " Avi Kivity
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