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KVM: Introduce kvm_memory_slot::arch and move lpage_info into it 

Some members of kvm_memory_slot are not used by every architecture.

This patch is the first step to make this difference clear by
introducing kvm_memory_slot::arch;  lpage_info is moved into it.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2012-02-08 13:02:18 +09:00 committed by Avi Kivity
parent 189a2f7b24
commit db3fe4eb45
11 changed files with 122 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/ia64/include/asm/kvm_host.h
View File

@ -459,6 +459,9 @@ struct kvm_sal_data {
unsigned long boot_gp;
};
struct kvm_arch_memory_slot {
};
struct kvm_arch {
spinlock_t dirty_log_lock;

10
arch/ia64/kvm/kvm-ia64.c
View File

@ -1571,6 +1571,16 @@ int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
}
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
}
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
return 0;
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
struct kvm_memory_slot old,

3
arch/powerpc/include/asm/kvm_host.h
View File

@ -213,6 +213,9 @@ struct revmap_entry {
#define KVMPPC_PAGE_WRITETHRU HPTE_R_W /* 0x40 */
#define KVMPPC_GOT_PAGE 0x80
struct kvm_arch_memory_slot {
};
struct kvm_arch {
#ifdef CONFIG_KVM_BOOK3S_64_HV
unsigned long hpt_virt;

10
arch/powerpc/kvm/powerpc.c
View File

@ -281,6 +281,16 @@ long kvm_arch_dev_ioctl(struct file *filp,
return -EINVAL;
}
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
}
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
return 0;
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
struct kvm_memory_slot old,

3
arch/s390/include/asm/kvm_host.h
View File

@ -245,6 +245,9 @@ struct kvm_vm_stat {
u32 remote_tlb_flush;
};
struct kvm_arch_memory_slot {
};
struct kvm_arch{
struct sca_block *sca;
debug_info_t *dbf;

10
arch/s390/kvm/kvm-s390.c
View File

@ -814,6 +814,16 @@ int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
return VM_FAULT_SIGBUS;
}
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
}
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
return 0;
}
/* Section: memory related */
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,

9
arch/x86/include/asm/kvm_host.h
View File

@ -483,6 +483,15 @@ struct kvm_vcpu_arch {
} osvw;
};
struct kvm_lpage_info {
unsigned long rmap_pde;
int write_count;
};
struct kvm_arch_memory_slot {
struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
};
struct kvm_arch {
unsigned int n_used_mmu_pages;
unsigned int n_requested_mmu_pages;

2
arch/x86/kvm/mmu.c
View File

@ -689,7 +689,7 @@ static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn,
unsigned long idx;
idx = gfn_to_index(gfn, slot->base_gfn, level);
return &slot->lpage_info[level - 2][idx];
return &slot->arch.lpage_info[level - 2][idx];
}
static void account_shadowed(struct kvm *kvm, gfn_t gfn)

59
arch/x86/kvm/x86.c
View File

@ -6239,6 +6239,65 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
put_page(kvm->arch.ept_identity_pagetable);
}
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
int i;
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) {
vfree(free->arch.lpage_info[i]);
free->arch.lpage_info[i] = NULL;
}
}
}
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
int i;
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
unsigned long ugfn;
int lpages;
int level = i + 2;
lpages = gfn_to_index(slot->base_gfn + npages - 1,
slot->base_gfn, level) + 1;
slot->arch.lpage_info[i] =
vzalloc(lpages * sizeof(*slot->arch.lpage_info[i]));
if (!slot->arch.lpage_info[i])
goto out_free;
if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
slot->arch.lpage_info[i][0].write_count = 1;
if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
slot->arch.lpage_info[i][lpages - 1].write_count = 1;
ugfn = slot->userspace_addr >> PAGE_SHIFT;
/*
* If the gfn and userspace address are not aligned wrt each
* other, or if explicitly asked to, disable large page
* support for this slot
*/
if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
!kvm_largepages_enabled()) {
unsigned long j;
for (j = 0; j < lpages; ++j)
slot->arch.lpage_info[i][j].write_count = 1;
}
}
return 0;
out_free:
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
vfree(slot->arch.lpage_info[i]);
slot->arch.lpage_info[i] = NULL;
}
return -ENOMEM;
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
struct kvm_memory_slot old,

11
include/linux/kvm_host.h
View File

@ -171,11 +171,6 @@ static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
*/
#define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)
struct kvm_lpage_info {
unsigned long rmap_pde;
int write_count;
};
struct kvm_memory_slot {
gfn_t base_gfn;
unsigned long npages;
@ -184,7 +179,7 @@ struct kvm_memory_slot {
unsigned long *dirty_bitmap;
unsigned long *dirty_bitmap_head;
unsigned long nr_dirty_pages;
struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
struct kvm_arch_memory_slot arch;
unsigned long userspace_addr;
int user_alloc;
int id;
@ -376,6 +371,9 @@ 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);
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont);
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages);
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
struct kvm_memory_slot old,
@ -385,6 +383,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
struct kvm_memory_slot old,
int user_alloc);
bool kvm_largepages_enabled(void);
void kvm_disable_largepages(void);
void kvm_arch_flush_shadow(struct kvm *kvm);

70
virt/kvm/kvm_main.c
View File

@ -535,21 +535,13 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
int i;
if (!dont || free->rmap != dont->rmap)
vfree(free->rmap);
if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
kvm_destroy_dirty_bitmap(free);
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
vfree(free->lpage_info[i]);
free->lpage_info[i] = NULL;
}
}
kvm_arch_free_memslot(free, dont);
free->npages = 0;
free->rmap = NULL;
@ -685,53 +677,6 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
slots->generation++;
}
#ifndef CONFIG_S390
static int create_lpage_info(struct kvm_memory_slot *slot, unsigned long npages)
{
int i;
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
unsigned long ugfn;
int lpages;
int level = i + 2;
lpages = gfn_to_index(slot->base_gfn + npages - 1,
slot->base_gfn, level) + 1;
slot->lpage_info[i] = vzalloc(lpages * sizeof(*slot->lpage_info[i]));
if (!slot->lpage_info[i])
goto out_free;
if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
slot->lpage_info[i][0].write_count = 1;
if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
slot->lpage_info[i][lpages - 1].write_count = 1;
ugfn = slot->userspace_addr >> PAGE_SHIFT;
/*
* If the gfn and userspace address are not aligned wrt each
* other, or if explicitly asked to, disable large page
* support for this slot
*/
if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
!largepages_enabled) {
unsigned long j;
for (j = 0; j < lpages; ++j)
slot->lpage_info[i][j].write_count = 1;
}
}
return 0;
out_free:
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
vfree(slot->lpage_info[i]);
slot->lpage_info[i] = NULL;
}
return -ENOMEM;
}
#endif /* not defined CONFIG_S390 */
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@ -819,10 +764,9 @@ int __kvm_set_memory_region(struct kvm *kvm,
new.rmap = vzalloc(npages * sizeof(*new.rmap));
if (!new.rmap)
goto out_free;
if (create_lpage_info(&new, npages))
goto out_free;
#endif /* not defined CONFIG_S390 */
if (kvm_arch_create_memslot(&new, npages))
goto out_free;
}
/* Allocate page dirty bitmap if needed */
@ -880,8 +824,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (!npages) {
new.rmap = NULL;
new.dirty_bitmap = NULL;
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
new.lpage_info[i] = NULL;
memset(&new.arch, 0, sizeof(new.arch));
}
update_memslots(slots, &new);
@ -968,6 +911,11 @@ int kvm_get_dirty_log(struct kvm *kvm,
return r;
}
bool kvm_largepages_enabled(void)
{
return largepages_enabled;
}
void kvm_disable_largepages(void)
{
largepages_enabled = false;