Hi, all
I have worked out a rough patch to split mmu code from kvm_main.c.
Welcome comments!
Currently, most of code wrt mmu are moved to arch, but one exception
exists. In fucntion kvm_vm_ioctl_get_diry_log, I used
KVM_CAP_MMU_SHADOW_CACHE_CONTROL to comment two lines. Can it be
accepted? or good ideas?
Xiantao
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 96d9c7d..d1e6e04 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -526,6 +526,9 @@ int kvm_is_error_hva(unsigned long addr);
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,
+ struct kvm_userspace_memory_region *mem,
+ int user_alloc);
int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
int user_alloc);
@@ -636,6 +639,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg);
void kvm_arch_destroy_vm(struct kvm *kvm);
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+ struct kvm_translation *tr);
+
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu
*fpu);
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu
*fpu);
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 2cbf662..303430d 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -362,29 +362,9 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (mem->slot >= kvm->nmemslots)
kvm->nmemslots = mem->slot + 1;
- if (!kvm->n_requested_mmu_pages) {
- unsigned int n_pages;
-
- if (npages) {
- n_pages = npages * KVM_PERMILLE_MMU_PAGES /
1000;
- kvm_mmu_change_mmu_pages(kvm,
kvm->n_alloc_mmu_pages +
- n_pages);
- } else {
- unsigned int nr_mmu_pages;
-
- n_pages = old.npages * KVM_PERMILLE_MMU_PAGES /
1000;
- nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
- nr_mmu_pages = max(nr_mmu_pages,
- (unsigned int)
KVM_MIN_ALLOC_MMU_PAGES);
- kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
- }
- }
*memslot = new;
- kvm_mmu_slot_remove_write_access(kvm, mem->slot);
- kvm_flush_remote_tlbs(kvm);
-
kvm_free_physmem_slot(&old, &new);
return 0;
@@ -404,6 +384,8 @@ int kvm_set_memory_region(struct kvm *kvm,
mutex_lock(&kvm->lock);
r = __kvm_set_memory_region(kvm, mem, user_alloc);
+ if (r == 0)
+ r = kvm_arch_set_memory_region(kvm, mem, user_alloc);
mutex_unlock(&kvm->lock);
return r;
}
@@ -452,8 +434,10 @@ static int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm,
/* If nothing is dirty, don't bother messing with page tables.
*/
if (any) {
+#ifdef KVM_CAP_MMU_SHADOW_CACHE_CONTROL
kvm_mmu_slot_remove_write_access(kvm, log->slot);
kvm_flush_remote_tlbs(kvm);
+#endif
memset(memslot->dirty_bitmap, 0, n);
}
@@ -761,29 +745,6 @@ void kvm_resched(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_resched);
-
-/*
- * Translate a guest virtual address to a guest physical address.
- */
-static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
- struct kvm_translation *tr)
-{
- unsigned long vaddr = tr->linear_address;
- gpa_t gpa;
-
- vcpu_load(vcpu);
- mutex_lock(&vcpu->kvm->lock);
- gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
- tr->physical_address = gpa;
- tr->valid = gpa != UNMAPPED_GVA;
- tr->writeable = 1;
- tr->usermode = 0;
- mutex_unlock(&vcpu->kvm->lock);
- vcpu_put(vcpu);
-
- return 0;
-}
-
static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq)
{
@@ -987,7 +948,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
r = -EFAULT;
if (copy_from_user(&tr, argp, sizeof tr))
goto out;
- r = kvm_vcpu_ioctl_translate(vcpu, &tr);
+ r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
if (r)
goto out;
r = -EFAULT;
@@ -1441,10 +1402,6 @@ int kvm_init(void *opaque, unsigned int
vcpu_size,
int r;
int cpu;
- r = kvm_mmu_module_init();
- if (r)
- goto out4;
-
kvm_init_debug();
r = kvm_arch_init(opaque);
@@ -1503,8 +1460,6 @@ int kvm_init(void *opaque, unsigned int vcpu_size,
kvm_preempt_ops.sched_in = kvm_sched_in;
kvm_preempt_ops.sched_out = kvm_sched_out;
- kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
-
return 0;
out_free:
@@ -1523,7 +1478,6 @@ out_free_0:
out:
kvm_arch_exit();
kvm_exit_debug();
- kvm_mmu_module_exit();
out4:
return r;
}
@@ -1542,6 +1496,5 @@ void kvm_exit(void)
kvm_arch_exit();
kvm_exit_debug();
__free_page(bad_page);
- kvm_mmu_module_exit();
}
EXPORT_SYMBOL_GPL(kvm_exit);
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index 8d45920..1c02d5b 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -713,6 +713,28 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu
*vcpu,
return 0;
}
+/*
+ * Translate a guest virtual address to a guest physical address.
+ */
+int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
+ struct kvm_translation *tr)
+{
+ unsigned long vaddr = tr->linear_address;
+ gpa_t gpa;
+
+ vcpu_load(vcpu);
+ mutex_lock(&vcpu->kvm->lock);
+ gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
+ tr->physical_address = gpa;
+ tr->valid = gpa != UNMAPPED_GVA;
+ tr->writeable = 1;
+ tr->usermode = 0;
+ mutex_unlock(&vcpu->kvm->lock);
+ vcpu_put(vcpu);
+
+ return 0;
+}
+
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -1648,33 +1670,47 @@ EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
int kvm_arch_init(void *opaque)
{
+ int r;
struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
+ r = kvm_mmu_module_init();
+ if (r)
+ goto out_fail;
+
kvm_init_msr_list();
if (kvm_x86_ops) {
printk(KERN_ERR "kvm: already loaded the other
module\n");
- return -EEXIST;
+ r = -EEXIST;
+ goto out;
}
if (!ops->cpu_has_kvm_support()) {
printk(KERN_ERR "kvm: no hardware support\n");
- return -EOPNOTSUPP;
+ r = -EOPNOTSUPP;
+ goto out;
}
if (ops->disabled_by_bios()) {
printk(KERN_ERR "kvm: disabled by bios\n");
- return -EOPNOTSUPP;
+ r = -EOPNOTSUPP;
+ goto out;
}
kvm_x86_ops = ops;
+ kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
+ return 0;
- return 0;
+out:
+ kvm_mmu_module_exit();
+out_fail:
+ return r;
}
void kvm_arch_exit(void)
{
kvm_x86_ops = NULL;
- }
+ kvm_mmu_module_exit();
+}
int kvm_emulate_halt(struct kvm_vcpu *vcpu)
{
@@ -2502,3 +2538,34 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
kvm_mmu_destroy(vcpu);
free_page((unsigned long)vcpu->pio_data);
}
+
+int kvm_arch_set_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem,
+ int user_alloc)
+{
+ unsigned long npages = mem->memory_size >> PAGE_SHIFT;
+ struct kvm_memory_slot old = kvm->memslots[mem->slot];
+
+ if (!kvm->n_requested_mmu_pages) {
+ unsigned int n_pages;
+
+ if (npages) {
+ n_pages = npages * KVM_PERMILLE_MMU_PAGES /
1000;
+ kvm_mmu_change_mmu_pages(kvm,
kvm->n_alloc_mmu_pages +
+ n_pages);
+ } else {
+ unsigned int nr_mmu_pages;
+
+ n_pages = old.npages * KVM_PERMILLE_MMU_PAGES /
1000;
+ nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
+ nr_mmu_pages = max(nr_mmu_pages,
+ (unsigned int)
KVM_MIN_ALLOC_MMU_PAGES);
+ kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
+ }
+ }
+
+ kvm_mmu_slot_remove_write_access(kvm, mem->slot);
+ kvm_flush_remote_tlbs(kvm);
+ return 0;
+}
+
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