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

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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
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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 @@ out:
return r;
}
bool kvm_largepages_enabled(void)
{
return largepages_enabled;
}
void kvm_disable_largepages(void)
{
largepages_enabled = false;