From 9da0e4d5ac969909f6b435ce28ea28135a9cbd69 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 18 May 2015 13:33:16 +0200 Subject: [PATCH] KVM: x86: work on all available address spaces MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch has no semantic change, but it prepares for the introduction of a second address space for system management mode. A new function x86_set_memory_region (and the "slots_lock taken" counterpart __x86_set_memory_region) is introduced in order to operate on all address spaces when adding or deleting private memory slots. Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/kvm_host.h | 5 +++ arch/x86/kvm/mmu.c | 80 ++++++++++++++++++--------------- arch/x86/kvm/vmx.c | 6 +-- arch/x86/kvm/x86.c | 40 +++++++++++++++-- 4 files changed, 89 insertions(+), 42 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 2fd420255c2f..5a5e13af6e03 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1189,4 +1189,9 @@ int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data); void kvm_handle_pmu_event(struct kvm_vcpu *vcpu); void kvm_deliver_pmi(struct kvm_vcpu *vcpu); +int __x86_set_memory_region(struct kvm *kvm, + const struct kvm_userspace_memory_region *mem); +int x86_set_memory_region(struct kvm *kvm, + const struct kvm_userspace_memory_region *mem); + #endif /* _ASM_X86_KVM_HOST_H */ diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 3814f483ac45..7619e9e1745c 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1503,30 +1503,33 @@ static int kvm_handle_hva_range(struct kvm *kvm, struct kvm_memory_slot *memslot; struct slot_rmap_walk_iterator iterator; int ret = 0; + int i; - slots = kvm_memslots(kvm); + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + slots = __kvm_memslots(kvm, i); + kvm_for_each_memslot(memslot, slots) { + unsigned long hva_start, hva_end; + gfn_t gfn_start, gfn_end; - kvm_for_each_memslot(memslot, slots) { - unsigned long hva_start, hva_end; - gfn_t gfn_start, gfn_end; + hva_start = max(start, memslot->userspace_addr); + hva_end = min(end, memslot->userspace_addr + + (memslot->npages << PAGE_SHIFT)); + if (hva_start >= hva_end) + continue; + /* + * {gfn(page) | page intersects with [hva_start, hva_end)} = + * {gfn_start, gfn_start+1, ..., gfn_end-1}. + */ + gfn_start = hva_to_gfn_memslot(hva_start, memslot); + gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); - hva_start = max(start, memslot->userspace_addr); - hva_end = min(end, memslot->userspace_addr + - (memslot->npages << PAGE_SHIFT)); - if (hva_start >= hva_end) - continue; - /* - * {gfn(page) | page intersects with [hva_start, hva_end)} = - * {gfn_start, gfn_start+1, ..., gfn_end-1}. - */ - gfn_start = hva_to_gfn_memslot(hva_start, memslot); - gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); - - for_each_slot_rmap_range(memslot, PT_PAGE_TABLE_LEVEL, - PT_MAX_HUGEPAGE_LEVEL, gfn_start, gfn_end - 1, - &iterator) - ret |= handler(kvm, iterator.rmap, memslot, - iterator.gfn, iterator.level, data); + for_each_slot_rmap_range(memslot, PT_PAGE_TABLE_LEVEL, + PT_MAX_HUGEPAGE_LEVEL, + gfn_start, gfn_end - 1, + &iterator) + ret |= handler(kvm, iterator.rmap, memslot, + iterator.gfn, iterator.level, data); + } } return ret; @@ -4536,21 +4539,23 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end) { struct kvm_memslots *slots; struct kvm_memory_slot *memslot; - - slots = kvm_memslots(kvm); + int i; spin_lock(&kvm->mmu_lock); - kvm_for_each_memslot(memslot, slots) { - gfn_t start, end; + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + slots = __kvm_memslots(kvm, i); + kvm_for_each_memslot(memslot, slots) { + gfn_t start, end; - start = max(gfn_start, memslot->base_gfn); - end = min(gfn_end, memslot->base_gfn + memslot->npages); - if (start >= end) - continue; + start = max(gfn_start, memslot->base_gfn); + end = min(gfn_end, memslot->base_gfn + memslot->npages); + if (start >= end) + continue; - slot_handle_level_range(kvm, memslot, kvm_zap_rmapp, - PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL, - start, end - 1, true); + slot_handle_level_range(kvm, memslot, kvm_zap_rmapp, + PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL, + start, end - 1, true); + } } spin_unlock(&kvm->mmu_lock); @@ -4907,15 +4912,18 @@ unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) unsigned int nr_pages = 0; struct kvm_memslots *slots; struct kvm_memory_slot *memslot; + int i; - slots = kvm_memslots(kvm); + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + slots = __kvm_memslots(kvm, i); - kvm_for_each_memslot(memslot, slots) - nr_pages += memslot->npages; + kvm_for_each_memslot(memslot, slots) + nr_pages += memslot->npages; + } nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; nr_mmu_pages = max(nr_mmu_pages, - (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); + (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); return nr_mmu_pages; } diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 8c80b7d7343c..862fa8f2c61d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4115,7 +4115,7 @@ static int alloc_apic_access_page(struct kvm *kvm) kvm_userspace_mem.flags = 0; kvm_userspace_mem.guest_phys_addr = APIC_DEFAULT_PHYS_BASE; kvm_userspace_mem.memory_size = PAGE_SIZE; - r = __kvm_set_memory_region(kvm, &kvm_userspace_mem); + r = __x86_set_memory_region(kvm, &kvm_userspace_mem); if (r) goto out; @@ -4150,7 +4150,7 @@ static int alloc_identity_pagetable(struct kvm *kvm) kvm_userspace_mem.guest_phys_addr = kvm->arch.ept_identity_map_addr; kvm_userspace_mem.memory_size = PAGE_SIZE; - r = __kvm_set_memory_region(kvm, &kvm_userspace_mem); + r = __x86_set_memory_region(kvm, &kvm_userspace_mem); return r; } @@ -4956,7 +4956,7 @@ static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr) .flags = 0, }; - ret = kvm_set_memory_region(kvm, &tss_mem); + ret = x86_set_memory_region(kvm, &tss_mem); if (ret) return ret; kvm->arch.tss_addr = addr; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a510f135180a..caa0d5f8e6b3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7963,6 +7963,40 @@ void kvm_arch_sync_events(struct kvm *kvm) kvm_free_pit(kvm); } +int __x86_set_memory_region(struct kvm *kvm, + const struct kvm_userspace_memory_region *mem) +{ + int i, r; + + /* Called with kvm->slots_lock held. */ + BUG_ON(mem->slot >= KVM_MEM_SLOTS_NUM); + + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + struct kvm_userspace_memory_region m = *mem; + + m.slot |= i << 16; + r = __kvm_set_memory_region(kvm, &m); + if (r < 0) + return r; + } + + return 0; +} +EXPORT_SYMBOL_GPL(__x86_set_memory_region); + +int x86_set_memory_region(struct kvm *kvm, + const struct kvm_userspace_memory_region *mem) +{ + int r; + + mutex_lock(&kvm->slots_lock); + r = __x86_set_memory_region(kvm, mem); + mutex_unlock(&kvm->slots_lock); + + return r; +} +EXPORT_SYMBOL_GPL(x86_set_memory_region); + void kvm_arch_destroy_vm(struct kvm *kvm) { if (current->mm == kvm->mm) { @@ -7974,13 +8008,13 @@ void kvm_arch_destroy_vm(struct kvm *kvm) struct kvm_userspace_memory_region mem; memset(&mem, 0, sizeof(mem)); mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT; - kvm_set_memory_region(kvm, &mem); + x86_set_memory_region(kvm, &mem); mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT; - kvm_set_memory_region(kvm, &mem); + x86_set_memory_region(kvm, &mem); mem.slot = TSS_PRIVATE_MEMSLOT; - kvm_set_memory_region(kvm, &mem); + x86_set_memory_region(kvm, &mem); } kvm_iommu_unmap_guest(kvm); kfree(kvm->arch.vpic);