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KVM: Portability: Split kvm_set_memory_region() to have an arch callout

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Moving !user_alloc case to kvm_arch to avoid unnecessary
code logic in non-x86 platform.

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Zhang Xiantao 2007-11-20 16:25:04 +08:00 committed by Avi Kivity
parent 3ad82a7e87
commit 0de10343b3
3 changed files with 60 additions and 33 deletions
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4
drivers/kvm/kvm.h
View file

@ -391,6 +391,10 @@ int kvm_set_memory_region(struct kvm *kvm,
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,
struct kvm_memory_slot old,
int user_alloc);
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
void kvm_release_page_clean(struct page *page);

38
drivers/kvm/kvm_main.c
View file

@ -291,33 +291,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
memset(new.rmap, 0, npages * sizeof(*new.rmap));
new.user_alloc = user_alloc;
if (user_alloc)
new.userspace_addr = mem->userspace_addr;
else {
down_write(&current->mm->mmap_sem);
new.userspace_addr = do_mmap(NULL, 0,
npages * PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS,
0);
up_write(&current->mm->mmap_sem);
if (IS_ERR((void *)new.userspace_addr))
goto out_free;
}
} else {
if (!old.user_alloc && old.rmap) {
int ret;
down_write(&current->mm->mmap_sem);
ret = do_munmap(current->mm, old.userspace_addr,
old.npages * PAGE_SIZE);
up_write(&current->mm->mmap_sem);
if (ret < 0)
printk(KERN_WARNING
"kvm_vm_ioctl_set_memory_region: "
"failed to munmap memory\n");
}
new.userspace_addr = mem->userspace_addr;
}
/* Allocate page dirty bitmap if needed */
@ -335,14 +309,12 @@ int __kvm_set_memory_region(struct kvm *kvm,
*memslot = new;
if (!kvm->n_requested_mmu_pages) {
unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
if (r) {
*memslot = old;
goto out_free;
}
kvm_mmu_slot_remove_write_access(kvm, mem->slot);
kvm_flush_remote_tlbs(kvm);
kvm_free_physmem_slot(&old, &new);
return 0;

51
drivers/kvm/x86.c
View file

@ -24,6 +24,7 @@
#include <linux/fs.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/mman.h>
#include <asm/uaccess.h>
#include <asm/msr.h>
@ -2637,3 +2638,53 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
kvm_free_physmem(kvm);
kfree(kvm);
}
int kvm_arch_set_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;
struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
/*To keep backward compatibility with older userspace,
*x86 needs to hanlde !user_alloc case.
*/
if (!user_alloc) {
if (npages && !old.rmap) {
down_write(&current->mm->mmap_sem);
memslot->userspace_addr = do_mmap(NULL, 0,
npages * PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS,
0);
up_write(&current->mm->mmap_sem);
if (IS_ERR((void *)memslot->userspace_addr))
return PTR_ERR((void *)memslot->userspace_addr);
} else {
if (!old.user_alloc && old.rmap) {
int ret;
down_write(&current->mm->mmap_sem);
ret = do_munmap(current->mm, old.userspace_addr,
old.npages * PAGE_SIZE);
up_write(&current->mm->mmap_sem);
if (ret < 0)
printk(KERN_WARNING
"kvm_vm_ioctl_set_memory_region: "
"failed to munmap memory\n");
}
}
}
if (!kvm->n_requested_mmu_pages) {
unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
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;
}