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KVM: Prepare memslot data structures for multiple hugepage sizes 

[avi: fix build on non-x86]

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2009-06-19 15:16:23 +02:00 committed by Avi Kivity
parent f340ca0f06
commit ec04b2604c
8 changed files with 73 additions and 42 deletions
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3
arch/ia64/include/asm/kvm_host.h
View File

@ -235,7 +235,8 @@ struct kvm_vm_data {
#define KVM_REQ_PTC_G 32
#define KVM_REQ_RESUME 33
#define KVM_PAGES_PER_HPAGE 1
#define KVM_NR_PAGE_SIZES 1
#define KVM_PAGES_PER_HPAGE(x) 1
struct kvm;
struct kvm_vcpu;

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

@ -34,7 +34,8 @@
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
/* We don't currently support large pages. */
#define KVM_PAGES_PER_HPAGE (1UL << 31)
#define KVM_NR_PAGE_SIZES 1
#define KVM_PAGES_PER_HPAGE(x) (1UL<<31)
struct kvm;
struct kvm_run;

6
arch/s390/include/asm/kvm_host.h
View File

@ -40,7 +40,11 @@ struct sca_block {
struct sca_entry cpu[64];
} __attribute__((packed));
#define KVM_PAGES_PER_HPAGE 256
#define KVM_NR_PAGE_SIZES 2
#define KVM_HPAGE_SHIFT(x) (PAGE_SHIFT + ((x) - 1) * 8)
#define KVM_HPAGE_SIZE(x) (1UL << KVM_HPAGE_SHIFT(x))
#define KVM_HPAGE_MASK(x) (~(KVM_HPAGE_SIZE(x) - 1))
#define KVM_PAGES_PER_HPAGE(x) (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
#define CPUSTAT_HOST 0x80000000
#define CPUSTAT_WAIT 0x10000000

12
arch/x86/include/asm/kvm_host.h
View File

@ -54,12 +54,12 @@
#define INVALID_PAGE (~(hpa_t)0)
#define UNMAPPED_GVA (~(gpa_t)0)
/* shadow tables are PAE even on non-PAE hosts */
#define KVM_HPAGE_SHIFT 21
#define KVM_HPAGE_SIZE (1UL << KVM_HPAGE_SHIFT)
#define KVM_HPAGE_MASK (~(KVM_HPAGE_SIZE - 1))
#define KVM_PAGES_PER_HPAGE (KVM_HPAGE_SIZE / PAGE_SIZE)
/* KVM Hugepage definitions for x86 */
#define KVM_NR_PAGE_SIZES 2
#define KVM_HPAGE_SHIFT(x) (PAGE_SHIFT + (((x) - 1) * 9))
#define KVM_HPAGE_SIZE(x) (1UL << KVM_HPAGE_SHIFT(x))
#define KVM_HPAGE_MASK(x) (~(KVM_HPAGE_SIZE(x) - 1))
#define KVM_PAGES_PER_HPAGE(x) (KVM_HPAGE_SIZE(x) / PAGE_SIZE)
#define DE_VECTOR 0
#define DB_VECTOR 1

30
arch/x86/kvm/mmu.c
View File

@ -394,9 +394,9 @@ static int *slot_largepage_idx(gfn_t gfn, struct kvm_memory_slot *slot)
{
unsigned long idx;
idx = (gfn / KVM_PAGES_PER_HPAGE) -
(slot->base_gfn / KVM_PAGES_PER_HPAGE);
return &slot->lpage_info[idx].write_count;
idx = (gfn / KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL)) -
(slot->base_gfn / KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL));
return &slot->lpage_info[0][idx].write_count;
}
static void account_shadowed(struct kvm *kvm, gfn_t gfn)
@ -485,10 +485,10 @@ static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int lpage)
if (!lpage)
return &slot->rmap[gfn - slot->base_gfn];
idx = (gfn / KVM_PAGES_PER_HPAGE) -
(slot->base_gfn / KVM_PAGES_PER_HPAGE);
idx = (gfn / KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL)) -
(slot->base_gfn / KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL));
return &slot->lpage_info[idx].rmap_pde;
return &slot->lpage_info[0][idx].rmap_pde;
}
/*
@ -731,11 +731,11 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
end = start + (memslot->npages << PAGE_SHIFT);
if (hva >= start && hva < end) {
gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT;
int idx = gfn_offset /
KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL);
retval |= handler(kvm, &memslot->rmap[gfn_offset]);
retval |= handler(kvm,
&memslot->lpage_info[
gfn_offset /
KVM_PAGES_PER_HPAGE].rmap_pde);
&memslot->lpage_info[0][idx].rmap_pde);
}
}
@ -1876,8 +1876,9 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
pfn_t pfn;
unsigned long mmu_seq;
if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) {
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
if (is_largepage_backed(vcpu, gfn &
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1))) {
gfn &= ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
largepage = 1;
}
@ -2082,8 +2083,9 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa,
if (r)
return r;
if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) {
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
if (is_largepage_backed(vcpu, gfn &
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1))) {
gfn &= ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
largepage = 1;
}
mmu_seq = vcpu->kvm->mmu_notifier_seq;
@ -2485,7 +2487,7 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
if (is_large_pte(gpte) && is_largepage_backed(vcpu, gfn)) {
gfn &= ~(KVM_PAGES_PER_HPAGE-1);
gfn &= ~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
vcpu->arch.update_pte.largepage = 1;
}
vcpu->arch.update_pte.mmu_seq = vcpu->kvm->mmu_notifier_seq;

3
arch/x86/kvm/paging_tmpl.h
View File

@ -401,7 +401,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
if (walker.level == PT_DIRECTORY_LEVEL) {
gfn_t large_gfn;
large_gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE-1);
large_gfn = walker.gfn &
~(KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL) - 1);
if (is_largepage_backed(vcpu, large_gfn)) {
walker.gfn = large_gfn;
largepage = 1;

2
include/linux/kvm_host.h
View File

@ -103,7 +103,7 @@ struct kvm_memory_slot {
struct {
unsigned long rmap_pde;
int write_count;
} *lpage_info;
} *lpage_info[KVM_NR_PAGE_SIZES - 1];
unsigned long userspace_addr;
int user_alloc;
};

56
virt/kvm/kvm_main.c
View File

@ -1001,19 +1001,25 @@ out:
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)
vfree(free->dirty_bitmap);
if (!dont || free->lpage_info != dont->lpage_info)
vfree(free->lpage_info);
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;
}
}
free->npages = 0;
free->dirty_bitmap = NULL;
free->rmap = NULL;
free->lpage_info = NULL;
}
void kvm_free_physmem(struct kvm *kvm)
@ -1087,7 +1093,8 @@ int __kvm_set_memory_region(struct kvm *kvm,
int r;
gfn_t base_gfn;
unsigned long npages, ugfn;
unsigned long largepages, i;
int lpages;
unsigned long i, j;
struct kvm_memory_slot *memslot;
struct kvm_memory_slot old, new;
@ -1161,33 +1168,48 @@ int __kvm_set_memory_region(struct kvm *kvm,
else
new.userspace_addr = 0;
}
if (npages && !new.lpage_info) {
largepages = 1 + (base_gfn + npages - 1) / KVM_PAGES_PER_HPAGE;
largepages -= base_gfn / KVM_PAGES_PER_HPAGE;
if (!npages)
goto skip_lpage;
new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
int level = i + 2;
if (!new.lpage_info)
/* Avoid unused variable warning if no large pages */
(void)level;
if (new.lpage_info[i])
continue;
lpages = 1 + (base_gfn + npages - 1) /
KVM_PAGES_PER_HPAGE(level);
lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
if (!new.lpage_info[i])
goto out_free;
memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
memset(new.lpage_info[i], 0,
lpages * sizeof(*new.lpage_info[i]));
if (base_gfn % KVM_PAGES_PER_HPAGE)
new.lpage_info[0].write_count = 1;
if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
new.lpage_info[largepages-1].write_count = 1;
if (base_gfn % KVM_PAGES_PER_HPAGE(level))
new.lpage_info[i][0].write_count = 1;
if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
new.lpage_info[i][lpages - 1].write_count = 1;
ugfn = new.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 ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE - 1) ||
if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
!largepages_enabled)
for (i = 0; i < largepages; ++i)
new.lpage_info[i].write_count = 1;
for (j = 0; j < lpages; ++j)
new.lpage_info[i][j].write_count = 1;
}
skip_lpage:
/* Allocate page dirty bitmap if needed */
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;