}
EXPORT_SYMBOL_GPL(kvm_require_dr);
-/*
- * This function will be used to read from the physical memory of the currently
- * running guest. The difference to kvm_vcpu_read_guest_page is that this function
- * can read from guest physical or from the guest's guest physical memory.
- */
-int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
- gfn_t ngfn, void *data, int offset, int len,
- u32 access)
-{
- struct x86_exception exception;
- gfn_t real_gfn;
- gpa_t ngpa;
-
- ngpa = gfn_to_gpa(ngfn);
- real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception);
- if (real_gfn == UNMAPPED_GVA)
- return -EFAULT;
-
- real_gfn = gpa_to_gfn(real_gfn);
-
- return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len);
-}
-EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
-
static inline u64 pdptr_rsvd_bits(struct kvm_vcpu *vcpu)
{
return vcpu->arch.reserved_gpa_bits | rsvd_bits(5, 8) | rsvd_bits(1, 2);
int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
{
gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
- unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
+ gpa_t real_gpa;
int i;
int ret;
u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
- ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
- offset * sizeof(u64), sizeof(pdpte),
- PFERR_USER_MASK|PFERR_WRITE_MASK);
- if (ret < 0) {
- ret = 0;
- goto out;
- }
+ /*
+ * If the MMU is nested, CR3 holds an L2 GPA and needs to be translated
+ * to an L1 GPA.
+ */
+ real_gpa = mmu->translate_gpa(vcpu, gfn_to_gpa(pdpt_gfn),
+ PFERR_USER_MASK | PFERR_WRITE_MASK, NULL);
+ if (real_gpa == UNMAPPED_GVA)
+ return 0;
+
+ /* Note the offset, PDPTRs are 32 byte aligned when using PAE paging. */
+ ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(real_gpa), pdpte,
+ cr3 & GENMASK(11, 5), sizeof(pdpte));
+ if (ret < 0)
+ return 0;
+
for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
if ((pdpte[i] & PT_PRESENT_MASK) &&
(pdpte[i] & pdptr_rsvd_bits(vcpu))) {
- ret = 0;
- goto out;
+ return 0;
}
}
- ret = 1;
memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
kvm_register_mark_dirty(vcpu, VCPU_EXREG_PDPTR);
vcpu->arch.pdptrs_from_userspace = false;
-out:
-
- return ret;
+ return 1;
}
EXPORT_SYMBOL_GPL(load_pdptrs);
/*
* Do not allow the guest to set bits that we do not support
* saving. However, xcr0 bit 0 is always set, even if the
- * emulated CPU does not support XSAVE (see fx_init).
+ * emulated CPU does not support XSAVE (see kvm_vcpu_reset()).
*/
valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP;
if (xcr0 & ~valid_bits)
MSR_PLATFORM_INFO,
MSR_MISC_FEATURES_ENABLES,
MSR_AMD64_VIRT_SPEC_CTRL,
+ MSR_AMD64_TSC_RATIO,
MSR_IA32_POWER_CTL,
MSR_IA32_UCODE_REV,
#endif
}
-void kvm_make_mclock_inprogress_request(struct kvm *kvm)
+static void kvm_make_mclock_inprogress_request(struct kvm *kvm)
{
kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
}
-static void kvm_gen_update_masterclock(struct kvm *kvm)
+static void kvm_start_pvclock_update(struct kvm *kvm)
{
-#ifdef CONFIG_X86_64
- int i;
- struct kvm_vcpu *vcpu;
struct kvm_arch *ka = &kvm->arch;
- unsigned long flags;
-
- kvm_hv_invalidate_tsc_page(kvm);
kvm_make_mclock_inprogress_request(kvm);
/* no guest entries from this point */
- spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
- pvclock_update_vm_gtod_copy(kvm);
- spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
+ spin_lock_irq(&ka->pvclock_gtod_sync_lock);
+}
+
+static void kvm_end_pvclock_update(struct kvm *kvm)
+{
+ struct kvm_arch *ka = &kvm->arch;
+ struct kvm_vcpu *vcpu;
+ int i;
+ spin_unlock_irq(&ka->pvclock_gtod_sync_lock);
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
/* guest entries allowed */
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
-#endif
}
-u64 get_kvmclock_ns(struct kvm *kvm)
+static void kvm_update_masterclock(struct kvm *kvm)
+{
+ kvm_hv_invalidate_tsc_page(kvm);
+ kvm_start_pvclock_update(kvm);
+ pvclock_update_vm_gtod_copy(kvm);
+ kvm_end_pvclock_update(kvm);
+}
+
+static void get_kvmclock(struct kvm *kvm, struct kvm_clock_data *data)
{
struct kvm_arch *ka = &kvm->arch;
struct pvclock_vcpu_time_info hv_clock;
unsigned long flags;
- u64 ret;
spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
if (!ka->use_master_clock) {
spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
- return get_kvmclock_base_ns() + ka->kvmclock_offset;
+ data->clock = get_kvmclock_base_ns() + ka->kvmclock_offset;
+ return;
}
+ data->flags |= KVM_CLOCK_TSC_STABLE;
hv_clock.tsc_timestamp = ka->master_cycle_now;
hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset;
spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL,
&hv_clock.tsc_shift,
&hv_clock.tsc_to_system_mul);
- ret = __pvclock_read_cycles(&hv_clock, rdtsc());
- } else
- ret = get_kvmclock_base_ns() + ka->kvmclock_offset;
+ data->clock = __pvclock_read_cycles(&hv_clock, rdtsc());
+ } else {
+ data->clock = get_kvmclock_base_ns() + ka->kvmclock_offset;
+ }
put_cpu();
+}
- return ret;
+u64 get_kvmclock_ns(struct kvm *kvm)
+{
+ struct kvm_clock_data data;
+
+ /*
+ * Zero flags as it's accessed RMW, leave everything else uninitialized
+ * as clock is always written and no other fields are consumed.
+ */
+ data.flags = 0;
+
+ get_kvmclock(kvm, &data);
+ return data.clock;
}
static void kvm_setup_pvclock_page(struct kvm_vcpu *v,
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPU_ID:
- r = KVM_MAX_VCPU_ID;
+ r = KVM_MAX_VCPU_IDS;
break;
case KVM_CAP_PV_MMU: /* obsolete */
r = 0;
}
#endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */
+static int kvm_vm_ioctl_get_clock(struct kvm *kvm, void __user *argp)
+{
+ struct kvm_clock_data data;
+
+ memset(&data, 0, sizeof(data));
+ get_kvmclock(kvm, &data);
+ if (copy_to_user(argp, &data, sizeof(data)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int kvm_vm_ioctl_set_clock(struct kvm *kvm, void __user *argp)
+{
+ struct kvm_arch *ka = &kvm->arch;
+ struct kvm_clock_data data;
+ u64 now_ns;
+
+ if (copy_from_user(&data, argp, sizeof(data)))
+ return -EFAULT;
+
+ if (data.flags)
+ return -EINVAL;
+
+ kvm_hv_invalidate_tsc_page(kvm);
+ kvm_start_pvclock_update(kvm);
+ pvclock_update_vm_gtod_copy(kvm);
+
+ /*
+ * This pairs with kvm_guest_time_update(): when masterclock is
+ * in use, we use master_kernel_ns + kvmclock_offset to set
+ * unsigned 'system_time' so if we use get_kvmclock_ns() (which
+ * is slightly ahead) here we risk going negative on unsigned
+ * 'system_time' when 'data.clock' is very small.
+ */
+ if (kvm->arch.use_master_clock)
+ now_ns = ka->master_kernel_ns;
+ else
+ now_ns = get_kvmclock_base_ns();
+ ka->kvmclock_offset = data.clock - now_ns;
+ kvm_end_pvclock_update(kvm);
+ return 0;
+}
+
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
break;
}
#endif
- case KVM_SET_CLOCK: {
- struct kvm_arch *ka = &kvm->arch;
- struct kvm_clock_data user_ns;
- u64 now_ns;
-
- r = -EFAULT;
- if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
- goto out;
-
- r = -EINVAL;
- if (user_ns.flags)
- goto out;
-
- r = 0;
- /*
- * TODO: userspace has to take care of races with VCPU_RUN, so
- * kvm_gen_update_masterclock() can be cut down to locked
- * pvclock_update_vm_gtod_copy().
- */
- kvm_gen_update_masterclock(kvm);
-
- /*
- * This pairs with kvm_guest_time_update(): when masterclock is
- * in use, we use master_kernel_ns + kvmclock_offset to set
- * unsigned 'system_time' so if we use get_kvmclock_ns() (which
- * is slightly ahead) here we risk going negative on unsigned
- * 'system_time' when 'user_ns.clock' is very small.
- */
- spin_lock_irq(&ka->pvclock_gtod_sync_lock);
- if (kvm->arch.use_master_clock)
- now_ns = ka->master_kernel_ns;
- else
- now_ns = get_kvmclock_base_ns();
- ka->kvmclock_offset = user_ns.clock - now_ns;
- spin_unlock_irq(&ka->pvclock_gtod_sync_lock);
-
- kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE);
+ case KVM_SET_CLOCK:
+ r = kvm_vm_ioctl_set_clock(kvm, argp);
break;
- }
- case KVM_GET_CLOCK: {
- struct kvm_clock_data user_ns;
- u64 now_ns;
-
- now_ns = get_kvmclock_ns(kvm);
- user_ns.clock = now_ns;
- user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0;
- memset(&user_ns.pad, 0, sizeof(user_ns.pad));
-
- r = -EFAULT;
- if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
- goto out;
- r = 0;
+ case KVM_GET_CLOCK:
+ r = kvm_vm_ioctl_get_clock(kvm, argp);
break;
- }
case KVM_MEMORY_ENCRYPT_OP: {
r = -ENOTTY;
if (kvm_x86_ops.mem_enc_op)
static void kvm_hyperv_tsc_notifier(void)
{
struct kvm *kvm;
- struct kvm_vcpu *vcpu;
int cpu;
- unsigned long flags;
mutex_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
kvm_make_mclock_inprogress_request(kvm);
+ /* no guest entries from this point */
hyperv_stop_tsc_emulation();
/* TSC frequency always matches when on Hyper-V */
list_for_each_entry(kvm, &vm_list, vm_list) {
struct kvm_arch *ka = &kvm->arch;
- spin_lock_irqsave(&ka->pvclock_gtod_sync_lock, flags);
+ spin_lock_irq(&ka->pvclock_gtod_sync_lock);
pvclock_update_vm_gtod_copy(kvm);
- spin_unlock_irqrestore(&ka->pvclock_gtod_sync_lock, flags);
-
- kvm_for_each_vcpu(cpu, vcpu, kvm)
- kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
-
- kvm_for_each_vcpu(cpu, vcpu, kvm)
- kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
+ kvm_end_pvclock_update(kvm);
}
+
mutex_unlock(&kvm_lock);
}
#endif
void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
unsigned long *vcpu_bitmap)
{
- cpumask_var_t cpus;
-
- zalloc_cpumask_var(&cpus, GFP_ATOMIC);
-
- kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC,
- NULL, vcpu_bitmap, cpus);
-
- free_cpumask_var(cpus);
+ kvm_make_vcpus_request_mask(kvm, KVM_REQ_SCAN_IOAPIC, vcpu_bitmap);
}
void kvm_make_scan_ioapic_request(struct kvm *kvm)
if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
__kvm_migrate_timers(vcpu);
if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu))
- kvm_gen_update_masterclock(vcpu->kvm);
+ kvm_update_masterclock(vcpu->kvm);
if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu))
kvm_gen_kvmclock_update(vcpu);
if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
return 0;
}
-static void fx_init(struct kvm_vcpu *vcpu)
-{
- if (!vcpu->arch.guest_fpu)
- return;
-
- fpstate_init(&vcpu->arch.guest_fpu->state);
- if (boot_cpu_has(X86_FEATURE_XSAVES))
- vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv =
- host_xcr0 | XSTATE_COMPACTION_ENABLED;
-
- /*
- * Ensure guest xcr0 is valid for loading
- */
- vcpu->arch.xcr0 = XFEATURE_MASK_FP;
-
- vcpu->arch.cr0 |= X86_CR0_ET;
-}
-
void kvm_free_guest_fpu(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.guest_fpu) {
pr_err("kvm: failed to allocate vcpu's fpu\n");
goto free_user_fpu;
}
- fx_init(vcpu);
+ fpstate_init(&vcpu->arch.guest_fpu->state);
+ if (boot_cpu_has(X86_FEATURE_XSAVES))
+ vcpu->arch.guest_fpu->state.xsave.header.xcomp_bv =
+ host_xcr0 | XSTATE_COMPACTION_ENABLED;
vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu);
void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
{
+ struct kvm_cpuid_entry2 *cpuid_0x1;
unsigned long old_cr0 = kvm_read_cr0(vcpu);
unsigned long new_cr0;
- u32 eax, dummy;
+
+ /*
+ * Several of the "set" flows, e.g. ->set_cr0(), read other registers
+ * to handle side effects. RESET emulation hits those flows and relies
+ * on emulated/virtualized registers, including those that are loaded
+ * into hardware, to be zeroed at vCPU creation. Use CRs as a sentinel
+ * to detect improper or missing initialization.
+ */
+ WARN_ON_ONCE(!init_event &&
+ (old_cr0 || kvm_read_cr3(vcpu) || kvm_read_cr4(vcpu)));
kvm_lapic_reset(vcpu, init_event);
vcpu->arch.xcr0 = XFEATURE_MASK_FP;
}
+ /* All GPRs except RDX (handled below) are zeroed on RESET/INIT. */
memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
- vcpu->arch.regs_avail = ~0;
- vcpu->arch.regs_dirty = ~0;
+ kvm_register_mark_dirty(vcpu, VCPU_REGS_RSP);
/*
* Fall back to KVM's default Family/Model/Stepping of 0x600 (P6/Athlon)
* if no CPUID match is found. Note, it's impossible to get a match at
* RESET since KVM emulates RESET before exposing the vCPU to userspace,
- * i.e. it'simpossible for kvm_cpuid() to find a valid entry on RESET.
- * But, go through the motions in case that's ever remedied.
+ * i.e. it's impossible for kvm_find_cpuid_entry() to find a valid entry
+ * on RESET. But, go through the motions in case that's ever remedied.
*/
- eax = 1;
- if (!kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy, true))
- eax = 0x600;
- kvm_rdx_write(vcpu, eax);
+ cpuid_0x1 = kvm_find_cpuid_entry(vcpu, 1, 0);
+ kvm_rdx_write(vcpu, cpuid_0x1 ? cpuid_0x1->eax : 0x600);
vcpu->arch.ia32_xss = 0;
void kvm_arch_free_vm(struct kvm *kvm)
{
kfree(to_kvm_hv(kvm)->hv_pa_pg);
- vfree(kvm);
+ __kvm_arch_free_vm(kvm);
}
}
}
- if (kvm_page_track_create_memslot(slot, npages))
+ if (kvm_page_track_create_memslot(kvm, slot, npages))
goto out_free;
return 0;
return static_call(kvm_x86_update_pi_irte)(kvm, host_irq, guest_irq, set);
}
+bool kvm_arch_irqfd_route_changed(struct kvm_kernel_irq_routing_entry *old,
+ struct kvm_kernel_irq_routing_entry *new)
+{
+ if (new->type != KVM_IRQ_ROUTING_MSI)
+ return true;
+
+ return !!memcmp(&old->msi, &new->msi, sizeof(new->msi));
+}
+
bool kvm_vector_hashing_enabled(void)
{
return vector_hashing;
projects / linux-2.6-microblaze.git / blobdiff