From db3fe4eb45f3555d91a7124e18cf3a2f2a30eb90 Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Wed, 8 Feb 2012 13:02:18 +0900 Subject: 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 Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h index 2689ee5..e35b3a8 100644 --- a/arch/ia64/include/asm/kvm_host.h +++ b/arch/ia64/include/asm/kvm_host.h @@ -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; diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c index 8ca7261..d8ddbba 100644 --- a/arch/ia64/kvm/kvm-ia64.c +++ b/arch/ia64/kvm/kvm-ia64.c @@ -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, diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 1843d5d..52eb9c1 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -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; diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 0e21d15..00d7e34 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -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, diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index e630426..7343872 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -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; diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index cf3c0a9..17ad69d 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -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, diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index c24125c..74c9edf 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -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; diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 37e7f10..ff053ca 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3df0b7a..ca74c1d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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, diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 7a08496..355e445 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -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); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a30447c..8340e0e 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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; -- cgit v0.10.2