Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm:
  x86: disable KVM for Voyager and friends
  KVM: VMX: Avoid rearranging switched guest msrs while they are loaded
  KVM: MMU: Fix race when instantiating a shadow pte
  KVM: Route irq 0 to vcpu 0 exclusively
  KVM: Avoid infinite-frequency local apic timer
  KVM: make MMU_DEBUG compile again
  KVM: move alloc_apic_access_page() outside of non-preemptable region
  KVM: SVM: fix Windows XP 64 bit installation crash
  KVM: remove the usage of the mmap_sem for the protection of the memory slots.
  KVM: emulate access to MSR_IA32_MCG_CTL
  KVM: Make the supported cpuid list a host property rather than a vm property
  KVM: Fix kvm_arch_vcpu_ioctl_set_sregs so that set_cr0 works properly
  KVM: SVM: set NM intercept when enabling CR0.TS in the guest
  KVM: SVM: Fix lazy FPU switching

7 files changed, 142 insertions, 76 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4a88cf7695b4..53800b80a204 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -21,7 +21,7 @@ config X86
         select HAVE_IDE
         select HAVE_OPROFILE
         select HAVE_KPROBES
-        select HAVE_KVM
+        select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
 
 
 config GENERIC_LOCKBREAK
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2cbee9479ce4..68a6b1511934 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -647,6 +647,10 @@ static void start_apic_timer(struct kvm_lapic *apic)
         apic->timer.period = apic_get_reg(apic, APIC_TMICT) *
                     APIC_BUS_CYCLE_NS * apic->timer.divide_count;
         atomic_set(&apic->timer.pending, 0);
+
+        if (!apic->timer.period)
+                return;
+
         hrtimer_start(&apic->timer.dev,
                       ktime_add_ns(now, apic->timer.period),
                       HRTIMER_MODE_ABS);
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8efdcdbebb03..d8172aabc660 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -681,8 +681,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
                                              unsigned level,
                                              int metaphysical,
                                              unsigned access,
-                                             u64 *parent_pte,
-                                             bool *new_page)
+                                             u64 *parent_pte)
 {
         union kvm_mmu_page_role role;
         unsigned index;
@@ -722,8 +721,6 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
         vcpu->arch.mmu.prefetch_page(vcpu, sp);
         if (!metaphysical)
                 rmap_write_protect(vcpu->kvm, gfn);
-        if (new_page)
-                *new_page = 1;
         return sp;
 }
 
@@ -876,11 +873,18 @@ static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn)
 
 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
 {
+        struct page *page;
+
         gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva);
 
         if (gpa == UNMAPPED_GVA)
                 return NULL;
-        return gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
+
+        down_read(&current->mm->mmap_sem);
+        page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
+        up_read(&current->mm->mmap_sem);
+
+        return page;
 }
 
 static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
@@ -999,8 +1003,7 @@ static int __nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write,
                                 >> PAGE_SHIFT;
                         new_table = kvm_mmu_get_page(vcpu, pseudo_gfn,
                                                      v, level - 1,
-                                                     1, ACC_ALL, &table[index],
-                                                     NULL);
+                                                     1, ACC_ALL, &table[index]);
                         if (!new_table) {
                                 pgprintk("nonpaging_map: ENOMEM\n");
                                 kvm_release_page_clean(page);
@@ -1020,15 +1023,18 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
 
         struct page *page;
 
+        down_read(&vcpu->kvm->slots_lock);
+
         down_read(&current->mm->mmap_sem);
         page = gfn_to_page(vcpu->kvm, gfn);
+        up_read(&current->mm->mmap_sem);
 
         spin_lock(&vcpu->kvm->mmu_lock);
         kvm_mmu_free_some_pages(vcpu);
         r = __nonpaging_map(vcpu, v, write, gfn, page);
         spin_unlock(&vcpu->kvm->mmu_lock);
 
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         return r;
 }
@@ -1090,7 +1096,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
 
                 ASSERT(!VALID_PAGE(root));
                 sp = kvm_mmu_get_page(vcpu, root_gfn, 0,
-                                      PT64_ROOT_LEVEL, 0, ACC_ALL, NULL, NULL);
+                                      PT64_ROOT_LEVEL, 0, ACC_ALL, NULL);
                 root = __pa(sp->spt);
                 ++sp->root_count;
                 vcpu->arch.mmu.root_hpa = root;
@@ -1111,7 +1117,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
                         root_gfn = 0;
                 sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
                                       PT32_ROOT_LEVEL, !is_paging(vcpu),
-                                      ACC_ALL, NULL, NULL);
+                                      ACC_ALL, NULL);
                 root = __pa(sp->spt);
                 ++sp->root_count;
                 vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK;
@@ -1172,7 +1178,7 @@ void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu)
 
 static void paging_new_cr3(struct kvm_vcpu *vcpu)
 {
-        pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3);
+        pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->arch.cr3);
         mmu_free_roots(vcpu);
 }
 
@@ -1362,6 +1368,7 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
         gfn_t gfn;
         int r;
         u64 gpte = 0;
+        struct page *page;
 
         if (bytes != 4 && bytes != 8)
                 return;
@@ -1389,6 +1396,11 @@ static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
         if (!is_present_pte(gpte))
                 return;
         gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
+
+        down_read(&current->mm->mmap_sem);
+        page = gfn_to_page(vcpu->kvm, gfn);
+        up_read(&current->mm->mmap_sem);
+
         vcpu->arch.update_pte.gfn = gfn;
         vcpu->arch.update_pte.page = gfn_to_page(vcpu->kvm, gfn);
 }
@@ -1496,9 +1508,9 @@ int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
         gpa_t gpa;
         int r;
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva);
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         spin_lock(&vcpu->kvm->mmu_lock);
         r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 03ba8608fe0f..ecc0856268c4 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -91,7 +91,10 @@ static bool FNAME(cmpxchg_gpte)(struct kvm *kvm,
         pt_element_t *table;
         struct page *page;
 
+        down_read(&current->mm->mmap_sem);
         page = gfn_to_page(kvm, table_gfn);
+        up_read(&current->mm->mmap_sem);
+
         table = kmap_atomic(page, KM_USER0);
 
         ret = CMPXCHG(&table[index], orig_pte, new_pte);
@@ -140,7 +143,7 @@ walk:
         }
 #endif
         ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) ||
-               (vcpu->cr3 & CR3_NONPAE_RESERVED_BITS) == 0);
+               (vcpu->arch.cr3 & CR3_NONPAE_RESERVED_BITS) == 0);
 
         pt_access = ACC_ALL;
 
@@ -297,7 +300,6 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
                 u64 shadow_pte;
                 int metaphysical;
                 gfn_t table_gfn;
-                bool new_page = 0;
 
                 shadow_ent = ((u64 *)__va(shadow_addr)) + index;
                 if (level == PT_PAGE_TABLE_LEVEL)
@@ -319,8 +321,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
                 }
                 shadow_page = kvm_mmu_get_page(vcpu, table_gfn, addr, level-1,
                                                metaphysical, access,
-                                               shadow_ent, &new_page);
-                if (new_page && !metaphysical) {
+                                               shadow_ent);
+                if (!metaphysical) {
                         int r;
                         pt_element_t curr_pte;
                         r = kvm_read_guest_atomic(vcpu->kvm,
@@ -378,7 +380,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
         if (r)
                 return r;
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         /*
          * Look up the shadow pte for the faulting address.
          */
@@ -392,11 +394,13 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
                 pgprintk("%s: guest page fault\n", __FUNCTION__);
                 inject_page_fault(vcpu, addr, walker.error_code);
                 vcpu->arch.last_pt_write_count = 0; /* reset fork detector */
-                up_read(&current->mm->mmap_sem);
+                up_read(&vcpu->kvm->slots_lock);
                 return 0;
         }
 
+        down_read(&current->mm->mmap_sem);
         page = gfn_to_page(vcpu->kvm, walker.gfn);
+        up_read(&current->mm->mmap_sem);
 
         spin_lock(&vcpu->kvm->mmu_lock);
         kvm_mmu_free_some_pages(vcpu);
@@ -413,14 +417,14 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
          */
         if (shadow_pte && is_io_pte(*shadow_pte)) {
                 spin_unlock(&vcpu->kvm->mmu_lock);
-                up_read(&current->mm->mmap_sem);
+                up_read(&vcpu->kvm->slots_lock);
                 return 1;
         }
 
         ++vcpu->stat.pf_fixed;
         kvm_mmu_audit(vcpu, "post page fault (fixed)");
         spin_unlock(&vcpu->kvm->mmu_lock);
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         return write_pt;
 }
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index de755cb1431d..1a582f1090e8 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -792,6 +792,10 @@ static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
         vcpu->arch.cr0 = cr0;
         cr0 |= X86_CR0_PG | X86_CR0_WP;
         cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
+        if (!vcpu->fpu_active) {
+                svm->vmcb->control.intercept_exceptions |= (1 << NM_VECTOR);
+                cr0 |= X86_CR0_TS;
+        }
         svm->vmcb->save.cr0 = cr0;
 }
 
@@ -1096,6 +1100,24 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
         case MSR_IA32_SYSENTER_ESP:
                 *data = svm->vmcb->save.sysenter_esp;
                 break;
+        /* Nobody will change the following 5 values in the VMCB so
+           we can safely return them on rdmsr. They will always be 0
+           until LBRV is implemented. */
+        case MSR_IA32_DEBUGCTLMSR:
+                *data = svm->vmcb->save.dbgctl;
+                break;
+        case MSR_IA32_LASTBRANCHFROMIP:
+                *data = svm->vmcb->save.br_from;
+                break;
+        case MSR_IA32_LASTBRANCHTOIP:
+                *data = svm->vmcb->save.br_to;
+                break;
+        case MSR_IA32_LASTINTFROMIP:
+                *data = svm->vmcb->save.last_excp_from;
+                break;
+        case MSR_IA32_LASTINTTOIP:
+                *data = svm->vmcb->save.last_excp_to;
+                break;
         default:
                 return kvm_get_msr_common(vcpu, ecx, data);
         }
@@ -1156,6 +1178,10 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
         case MSR_IA32_SYSENTER_ESP:
                 svm->vmcb->save.sysenter_esp = data;
                 break;
+        case MSR_IA32_DEBUGCTLMSR:
+                pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
+                                __FUNCTION__, data);
+                break;
         case MSR_K7_EVNTSEL0:
         case MSR_K7_EVNTSEL1:
         case MSR_K7_EVNTSEL2:
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index ad36447e696e..94ea724638fd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -638,6 +638,7 @@ static void setup_msrs(struct vcpu_vmx *vmx)
 {
         int save_nmsrs;
 
+        vmx_load_host_state(vmx);
         save_nmsrs = 0;
 #ifdef CONFIG_X86_64
         if (is_long_mode(&vmx->vcpu)) {
@@ -1477,7 +1478,7 @@ static int alloc_apic_access_page(struct kvm *kvm)
         struct kvm_userspace_memory_region kvm_userspace_mem;
         int r = 0;
 
-        down_write(&current->mm->mmap_sem);
+        down_write(&kvm->slots_lock);
         if (kvm->arch.apic_access_page)
                 goto out;
         kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
@@ -1487,9 +1488,12 @@ static int alloc_apic_access_page(struct kvm *kvm)
         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
         if (r)
                 goto out;
+
+        down_read(&current->mm->mmap_sem);
         kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
+        up_read(&current->mm->mmap_sem);
 out:
-        up_write(&current->mm->mmap_sem);
+        up_write(&kvm->slots_lock);
         return r;
 }
 
@@ -1602,9 +1606,6 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
         vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
         vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);
 
-        if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
-                if (alloc_apic_access_page(vmx->vcpu.kvm) != 0)
-                        return -ENOMEM;
 
         return 0;
 }
@@ -2534,6 +2535,9 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
         put_cpu();
         if (err)
                 goto free_vmcs;
+        if (vm_need_virtualize_apic_accesses(kvm))
+                if (alloc_apic_access_page(kvm) != 0)
+                        goto free_vmcs;
 
         return &vmx->vcpu;
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index cf5308148689..6b01552bd1f1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -46,6 +46,9 @@
 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
 
+static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
+                                    struct kvm_cpuid_entry2 __user *entries);
+
 struct kvm_x86_ops *kvm_x86_ops;
 
 struct kvm_stats_debugfs_item debugfs_entries[] = {
@@ -181,7 +184,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
         int ret;
         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
                                   offset * sizeof(u64), sizeof(pdpte));
         if (ret < 0) {
@@ -198,7 +201,7 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
 
         memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
 out:
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         return ret;
 }
@@ -212,13 +215,13 @@ static bool pdptrs_changed(struct kvm_vcpu *vcpu)
         if (is_long_mode(vcpu) || !is_pae(vcpu))
                 return false;
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
         if (r < 0)
                 goto out;
         changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
 out:
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         return changed;
 }
@@ -356,7 +359,7 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
                  */
         }
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         /*
          * Does the new cr3 value map to physical memory? (Note, we
          * catch an invalid cr3 even in real-mode, because it would
@@ -372,7 +375,7 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
                 vcpu->arch.cr3 = cr3;
                 vcpu->arch.mmu.new_cr3(vcpu);
         }
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 }
 EXPORT_SYMBOL_GPL(set_cr3);
 
@@ -484,6 +487,10 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
                         __FUNCTION__, data);
                 break;
+        case MSR_IA32_MCG_CTL:
+                pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
+                        __FUNCTION__, data);
+                break;
         case MSR_IA32_UCODE_REV:
         case MSR_IA32_UCODE_WRITE:
         case 0x200 ... 0x2ff: /* MTRRs */
@@ -526,6 +533,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
         case MSR_IA32_MC0_CTL:
         case MSR_IA32_MCG_STATUS:
         case MSR_IA32_MCG_CAP:
+        case MSR_IA32_MCG_CTL:
         case MSR_IA32_MC0_MISC:
         case MSR_IA32_MC0_MISC+4:
         case MSR_IA32_MC0_MISC+8:
@@ -727,6 +735,24 @@ long kvm_arch_dev_ioctl(struct file *filp,
                 r = 0;
                 break;
         }
+        case KVM_GET_SUPPORTED_CPUID: {
+                struct kvm_cpuid2 __user *cpuid_arg = argp;
+                struct kvm_cpuid2 cpuid;
+
+                r = -EFAULT;
+                if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
+                        goto out;
+                r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
+                        cpuid_arg->entries);
+                if (r)
+                        goto out;
+
+                r = -EFAULT;
+                if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
+                        goto out;
+                r = 0;
+                break;
+        }
         default:
                 r = -EINVAL;
         }
@@ -974,8 +1000,7 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
         put_cpu();
 }
 
-static int kvm_vm_ioctl_get_supported_cpuid(struct kvm *kvm,
-                                    struct kvm_cpuid2 *cpuid,
+static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
                                     struct kvm_cpuid_entry2 __user *entries)
 {
         struct kvm_cpuid_entry2 *cpuid_entries;
@@ -1207,12 +1232,12 @@ static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
                 return -EINVAL;
 
-        down_write(&current->mm->mmap_sem);
+        down_write(&kvm->slots_lock);
 
         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
 
-        up_write(&current->mm->mmap_sem);
+        up_write(&kvm->slots_lock);
         return 0;
 }
 
@@ -1261,7 +1286,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
             < alias->target_phys_addr)
                 goto out;
 
-        down_write(&current->mm->mmap_sem);
+        down_write(&kvm->slots_lock);
 
         p = &kvm->arch.aliases[alias->slot];
         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
@@ -1275,7 +1300,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
 
         kvm_mmu_zap_all(kvm);
 
-        up_write(&current->mm->mmap_sem);
+        up_write(&kvm->slots_lock);
 
         return 0;
 
@@ -1351,7 +1376,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
         struct kvm_memory_slot *memslot;
         int is_dirty = 0;
 
-        down_write(&current->mm->mmap_sem);
+        down_write(&kvm->slots_lock);
 
         r = kvm_get_dirty_log(kvm, log, &is_dirty);
         if (r)
@@ -1367,7 +1392,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
         }
         r = 0;
 out:
-        up_write(&current->mm->mmap_sem);
+        up_write(&kvm->slots_lock);
         return r;
 }
 
@@ -1487,24 +1512,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
                 r = 0;
                 break;
         }
-        case KVM_GET_SUPPORTED_CPUID: {
-                struct kvm_cpuid2 __user *cpuid_arg = argp;
-                struct kvm_cpuid2 cpuid;
-
-                r = -EFAULT;
-                if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
-                        goto out;
-                r = kvm_vm_ioctl_get_supported_cpuid(kvm, &cpuid,
-                        cpuid_arg->entries);
-                if (r)
-                        goto out;
-
-                r = -EFAULT;
-                if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
-                        goto out;
-                r = 0;
-                break;
-        }
         default:
                 ;
         }
@@ -1563,7 +1570,7 @@ int emulator_read_std(unsigned long addr,
         void *data = val;
         int r = X86EMUL_CONTINUE;
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         while (bytes) {
                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
                 unsigned offset = addr & (PAGE_SIZE-1);
@@ -1585,7 +1592,7 @@ int emulator_read_std(unsigned long addr,
                 addr += tocopy;
         }
 out:
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
         return r;
 }
 EXPORT_SYMBOL_GPL(emulator_read_std);
@@ -1604,9 +1611,9 @@ static int emulator_read_emulated(unsigned long addr,
                 return X86EMUL_CONTINUE;
         }
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         /* For APIC access vmexit */
         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
@@ -1644,14 +1651,14 @@ static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 {
         int ret;
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
         if (ret < 0) {
-                up_read(&current->mm->mmap_sem);
+                up_read(&vcpu->kvm->slots_lock);
                 return 0;
         }
         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
         return 1;
 }
 
@@ -1663,9 +1670,9 @@ static int emulator_write_emulated_onepage(unsigned long addr,
         struct kvm_io_device *mmio_dev;
         gpa_t                 gpa;
 
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
 
         if (gpa == UNMAPPED_GVA) {
                 kvm_inject_page_fault(vcpu, addr, 2);
@@ -1742,7 +1749,7 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
                 char *kaddr;
                 u64 val;
 
-                down_read(&current->mm->mmap_sem);
+                down_read(&vcpu->kvm->slots_lock);
                 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
 
                 if (gpa == UNMAPPED_GVA ||
@@ -1753,13 +1760,17 @@ static int emulator_cmpxchg_emulated(unsigned long addr,
                         goto emul_write;
 
                 val = *(u64 *)new;
+
+                down_read(&current->mm->mmap_sem);
                 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
+                up_read(&current->mm->mmap_sem);
+
                 kaddr = kmap_atomic(page, KM_USER0);
                 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
                 kunmap_atomic(kaddr, KM_USER0);
                 kvm_release_page_dirty(page);
         emul_write:
-                up_read(&current->mm->mmap_sem);
+                up_read(&vcpu->kvm->slots_lock);
         }
 #endif
 
@@ -2152,10 +2163,10 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
                 kvm_x86_ops->skip_emulated_instruction(vcpu);
 
         for (i = 0; i < nr_pages; ++i) {
-                down_read(&current->mm->mmap_sem);
+                down_read(&vcpu->kvm->slots_lock);
                 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
                 vcpu->arch.pio.guest_pages[i] = page;
-                up_read(&current->mm->mmap_sem);
+                up_read(&vcpu->kvm->slots_lock);
                 if (!page) {
                         kvm_inject_gp(vcpu, 0);
                         free_pio_guest_pages(vcpu);
@@ -2478,8 +2489,9 @@ static void vapic_enter(struct kvm_vcpu *vcpu)
 
         down_read(&current->mm->mmap_sem);
         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
-        vcpu->arch.apic->vapic_page = page;
         up_read(&current->mm->mmap_sem);
+
+        vcpu->arch.apic->vapic_page = page;
 }
 
 static void vapic_exit(struct kvm_vcpu *vcpu)
@@ -2861,8 +2873,8 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
 
         mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
-        vcpu->arch.cr0 = sregs->cr0;
         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
+        vcpu->arch.cr0 = sregs->cr0;
 
         mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
@@ -2952,9 +2964,9 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
         gpa_t gpa;
 
         vcpu_load(vcpu);
-        down_read(&current->mm->mmap_sem);
+        down_read(&vcpu->kvm->slots_lock);
         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
-        up_read(&current->mm->mmap_sem);
+        up_read(&vcpu->kvm->slots_lock);
         tr->physical_address = gpa;
         tr->valid = gpa != UNMAPPED_GVA;
         tr->writeable = 1;
@@ -3227,11 +3239,13 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
          */
         if (!user_alloc) {
                 if (npages && !old.rmap) {
+                        down_write(&current->mm->mmap_sem);
                         memslot->userspace_addr = do_mmap(NULL, 0,
                                                      npages * PAGE_SIZE,
                                                      PROT_READ | PROT_WRITE,
                                                      MAP_SHARED | MAP_ANONYMOUS,
                                                      0);
+                        up_write(&current->mm->mmap_sem);
 
                         if (IS_ERR((void *)memslot->userspace_addr))
                                 return PTR_ERR((void *)memslot->userspace_addr);
@@ -3239,8 +3253,10 @@ int kvm_arch_set_memory_region(struct kvm *kvm,
                         if (!old.user_alloc && old.rmap) {
                                 int ret;
 
+                                down_write(&current->mm->mmap_sem);
                                 ret = do_munmap(current->mm, old.userspace_addr,
                                                 old.npages * PAGE_SIZE);
+                                up_write(&current->mm->mmap_sem);
                                 if (ret < 0)
                                         printk(KERN_WARNING
                                        "kvm_vm_ioctl_set_memory_region: "