The cpuid code has grown; put it into a separate file.
Signed-off-by: Avi Kivity <avi@redhat.com>
kvm-$(CONFIG_KVM_ASYNC_PF) += $(addprefix ../../../virt/kvm/, async_pf.o)
kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
- i8254.o timer.o
+ i8254.o timer.o cpuid.o
kvm-intel-y += vmx.o
kvm-amd-y += svm.o
--- /dev/null
+/*
+ * Kernel-based Virtual Machine driver for Linux
+ * cpuid support routines
+ *
+ * derived from arch/x86/kvm/x86.c
+ *
+ * Copyright 2011 Red Hat, Inc. and/or its affiliates.
+ * Copyright IBM Corporation, 2008
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/module.h>
+#include <asm/user.h>
+#include <asm/xsave.h>
+#include "cpuid.h"
+#include "lapic.h"
+#include "mmu.h"
+#include "trace.h"
+
+void kvm_update_cpuid(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+ struct kvm_lapic *apic = vcpu->arch.apic;
+
+ best = kvm_find_cpuid_entry(vcpu, 1, 0);
+ if (!best)
+ return;
+
+ /* Update OSXSAVE bit */
+ if (cpu_has_xsave && best->function == 0x1) {
+ best->ecx &= ~(bit(X86_FEATURE_OSXSAVE));
+ if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
+ best->ecx |= bit(X86_FEATURE_OSXSAVE);
+ }
+
+ if (apic) {
+ if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER))
+ apic->lapic_timer.timer_mode_mask = 3 << 17;
+ else
+ apic->lapic_timer.timer_mode_mask = 1 << 17;
+ }
+}
+
+static int is_efer_nx(void)
+{
+ unsigned long long efer = 0;
+
+ rdmsrl_safe(MSR_EFER, &efer);
+ return efer & EFER_NX;
+}
+
+static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
+{
+ int i;
+ struct kvm_cpuid_entry2 *e, *entry;
+
+ entry = NULL;
+ for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
+ e = &vcpu->arch.cpuid_entries[i];
+ if (e->function == 0x80000001) {
+ entry = e;
+ break;
+ }
+ }
+ if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
+ entry->edx &= ~(1 << 20);
+ printk(KERN_INFO "kvm: guest NX capability removed\n");
+ }
+}
+
+/* when an old userspace process fills a new kernel module */
+int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid *cpuid,
+ struct kvm_cpuid_entry __user *entries)
+{
+ int r, i;
+ struct kvm_cpuid_entry *cpuid_entries;
+
+ r = -E2BIG;
+ if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
+ goto out;
+ r = -ENOMEM;
+ cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
+ if (!cpuid_entries)
+ goto out;
+ r = -EFAULT;
+ if (copy_from_user(cpuid_entries, entries,
+ cpuid->nent * sizeof(struct kvm_cpuid_entry)))
+ goto out_free;
+ for (i = 0; i < cpuid->nent; i++) {
+ vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
+ vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
+ vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
+ vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
+ vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
+ vcpu->arch.cpuid_entries[i].index = 0;
+ vcpu->arch.cpuid_entries[i].flags = 0;
+ vcpu->arch.cpuid_entries[i].padding[0] = 0;
+ vcpu->arch.cpuid_entries[i].padding[1] = 0;
+ vcpu->arch.cpuid_entries[i].padding[2] = 0;
+ }
+ vcpu->arch.cpuid_nent = cpuid->nent;
+ cpuid_fix_nx_cap(vcpu);
+ r = 0;
+ kvm_apic_set_version(vcpu);
+ kvm_x86_ops->cpuid_update(vcpu);
+ kvm_update_cpuid(vcpu);
+
+out_free:
+ vfree(cpuid_entries);
+out:
+ return r;
+}
+
+int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries)
+{
+ int r;
+
+ r = -E2BIG;
+ if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
+ goto out;
+ r = -EFAULT;
+ if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
+ cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
+ goto out;
+ vcpu->arch.cpuid_nent = cpuid->nent;
+ kvm_apic_set_version(vcpu);
+ kvm_x86_ops->cpuid_update(vcpu);
+ kvm_update_cpuid(vcpu);
+ return 0;
+
+out:
+ return r;
+}
+
+int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries)
+{
+ int r;
+
+ r = -E2BIG;
+ if (cpuid->nent < vcpu->arch.cpuid_nent)
+ goto out;
+ r = -EFAULT;
+ if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
+ vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
+ goto out;
+ return 0;
+
+out:
+ cpuid->nent = vcpu->arch.cpuid_nent;
+ return r;
+}
+
+static void cpuid_mask(u32 *word, int wordnum)
+{
+ *word &= boot_cpu_data.x86_capability[wordnum];
+}
+
+static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
+ u32 index)
+{
+ entry->function = function;
+ entry->index = index;
+ cpuid_count(entry->function, entry->index,
+ &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
+ entry->flags = 0;
+}
+
+static bool supported_xcr0_bit(unsigned bit)
+{
+ u64 mask = ((u64)1 << bit);
+
+ return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0;
+}
+
+#define F(x) bit(X86_FEATURE_##x)
+
+static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
+ u32 index, int *nent, int maxnent)
+{
+ unsigned f_nx = is_efer_nx() ? F(NX) : 0;
+#ifdef CONFIG_X86_64
+ unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
+ ? F(GBPAGES) : 0;
+ unsigned f_lm = F(LM);
+#else
+ unsigned f_gbpages = 0;
+ unsigned f_lm = 0;
+#endif
+ unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
+
+ /* cpuid 1.edx */
+ const u32 kvm_supported_word0_x86_features =
+ F(FPU) | F(VME) | F(DE) | F(PSE) |
+ F(TSC) | F(MSR) | F(PAE) | F(MCE) |
+ F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
+ F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
+ F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
+ 0 /* Reserved, DS, ACPI */ | F(MMX) |
+ F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
+ 0 /* HTT, TM, Reserved, PBE */;
+ /* cpuid 0x80000001.edx */
+ const u32 kvm_supported_word1_x86_features =
+ F(FPU) | F(VME) | F(DE) | F(PSE) |
+ F(TSC) | F(MSR) | F(PAE) | F(MCE) |
+ F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
+ F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
+ F(PAT) | F(PSE36) | 0 /* Reserved */ |
+ f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
+ F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
+ 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
+ /* cpuid 1.ecx */
+ const u32 kvm_supported_word4_x86_features =
+ F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
+ 0 /* DS-CPL, VMX, SMX, EST */ |
+ 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
+ 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
+ 0 /* Reserved, DCA */ | F(XMM4_1) |
+ F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
+ 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
+ F(F16C) | F(RDRAND);
+ /* cpuid 0x80000001.ecx */
+ const u32 kvm_supported_word6_x86_features =
+ F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
+ F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
+ F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
+ 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
+
+ /* cpuid 0xC0000001.edx */
+ const u32 kvm_supported_word5_x86_features =
+ F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
+ F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
+ F(PMM) | F(PMM_EN);
+
+ /* cpuid 7.0.ebx */
+ const u32 kvm_supported_word9_x86_features =
+ F(SMEP) | F(FSGSBASE) | F(ERMS);
+
+ /* all calls to cpuid_count() should be made on the same cpu */
+ get_cpu();
+ do_cpuid_1_ent(entry, function, index);
+ ++*nent;
+
+ switch (function) {
+ case 0:
+ entry->eax = min(entry->eax, (u32)0xd);
+ break;
+ case 1:
+ entry->edx &= kvm_supported_word0_x86_features;
+ cpuid_mask(&entry->edx, 0);
+ entry->ecx &= kvm_supported_word4_x86_features;
+ cpuid_mask(&entry->ecx, 4);
+ /* we support x2apic emulation even if host does not support
+ * it since we emulate x2apic in software */
+ entry->ecx |= F(X2APIC);
+ break;
+ /* function 2 entries are STATEFUL. That is, repeated cpuid commands
+ * may return different values. This forces us to get_cpu() before
+ * issuing the first command, and also to emulate this annoying behavior
+ * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
+ case 2: {
+ int t, times = entry->eax & 0xff;
+
+ entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
+ entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
+ for (t = 1; t < times && *nent < maxnent; ++t) {
+ do_cpuid_1_ent(&entry[t], function, 0);
+ entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
+ ++*nent;
+ }
+ break;
+ }
+ /* function 4 has additional index. */
+ case 4: {
+ int i, cache_type;
+
+ entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ /* read more entries until cache_type is zero */
+ for (i = 1; *nent < maxnent; ++i) {
+ cache_type = entry[i - 1].eax & 0x1f;
+ if (!cache_type)
+ break;
+ do_cpuid_1_ent(&entry[i], function, i);
+ entry[i].flags |=
+ KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ ++*nent;
+ }
+ break;
+ }
+ case 7: {
+ entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ /* Mask ebx against host capbability word 9 */
+ if (index == 0) {
+ entry->ebx &= kvm_supported_word9_x86_features;
+ cpuid_mask(&entry->ebx, 9);
+ } else
+ entry->ebx = 0;
+ entry->eax = 0;
+ entry->ecx = 0;
+ entry->edx = 0;
+ break;
+ }
+ case 9:
+ break;
+ /* function 0xb has additional index. */
+ case 0xb: {
+ int i, level_type;
+
+ entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ /* read more entries until level_type is zero */
+ for (i = 1; *nent < maxnent; ++i) {
+ level_type = entry[i - 1].ecx & 0xff00;
+ if (!level_type)
+ break;
+ do_cpuid_1_ent(&entry[i], function, i);
+ entry[i].flags |=
+ KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ ++*nent;
+ }
+ break;
+ }
+ case 0xd: {
+ int idx, i;
+
+ entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ for (idx = 1, i = 1; *nent < maxnent && idx < 64; ++idx) {
+ do_cpuid_1_ent(&entry[i], function, idx);
+ if (entry[i].eax == 0 || !supported_xcr0_bit(idx))
+ continue;
+ entry[i].flags |=
+ KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ ++*nent;
+ ++i;
+ }
+ break;
+ }
+ case KVM_CPUID_SIGNATURE: {
+ char signature[12] = "KVMKVMKVM\0\0";
+ u32 *sigptr = (u32 *)signature;
+ entry->eax = 0;
+ entry->ebx = sigptr[0];
+ entry->ecx = sigptr[1];
+ entry->edx = sigptr[2];
+ break;
+ }
+ case KVM_CPUID_FEATURES:
+ entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
+ (1 << KVM_FEATURE_NOP_IO_DELAY) |
+ (1 << KVM_FEATURE_CLOCKSOURCE2) |
+ (1 << KVM_FEATURE_ASYNC_PF) |
+ (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
+
+ if (sched_info_on())
+ entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
+
+ entry->ebx = 0;
+ entry->ecx = 0;
+ entry->edx = 0;
+ break;
+ case 0x80000000:
+ entry->eax = min(entry->eax, 0x8000001a);
+ break;
+ case 0x80000001:
+ entry->edx &= kvm_supported_word1_x86_features;
+ cpuid_mask(&entry->edx, 1);
+ entry->ecx &= kvm_supported_word6_x86_features;
+ cpuid_mask(&entry->ecx, 6);
+ break;
+ case 0x80000008: {
+ unsigned g_phys_as = (entry->eax >> 16) & 0xff;
+ unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
+ unsigned phys_as = entry->eax & 0xff;
+
+ if (!g_phys_as)
+ g_phys_as = phys_as;
+ entry->eax = g_phys_as | (virt_as << 8);
+ entry->ebx = entry->edx = 0;
+ break;
+ }
+ case 0x80000019:
+ entry->ecx = entry->edx = 0;
+ break;
+ case 0x8000001a:
+ break;
+ case 0x8000001d:
+ break;
+ /*Add support for Centaur's CPUID instruction*/
+ case 0xC0000000:
+ /*Just support up to 0xC0000004 now*/
+ entry->eax = min(entry->eax, 0xC0000004);
+ break;
+ case 0xC0000001:
+ entry->edx &= kvm_supported_word5_x86_features;
+ cpuid_mask(&entry->edx, 5);
+ break;
+ case 3: /* Processor serial number */
+ case 5: /* MONITOR/MWAIT */
+ case 6: /* Thermal management */
+ case 0xA: /* Architectural Performance Monitoring */
+ case 0x80000007: /* Advanced power management */
+ case 0xC0000002:
+ case 0xC0000003:
+ case 0xC0000004:
+ default:
+ entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
+ break;
+ }
+
+ kvm_x86_ops->set_supported_cpuid(function, entry);
+
+ put_cpu();
+}
+
+#undef F
+
+int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries)
+{
+ struct kvm_cpuid_entry2 *cpuid_entries;
+ int limit, nent = 0, r = -E2BIG;
+ u32 func;
+
+ if (cpuid->nent < 1)
+ goto out;
+ if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
+ cpuid->nent = KVM_MAX_CPUID_ENTRIES;
+ r = -ENOMEM;
+ cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
+ if (!cpuid_entries)
+ goto out;
+
+ do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
+ limit = cpuid_entries[0].eax;
+ for (func = 1; func <= limit && nent < cpuid->nent; ++func)
+ do_cpuid_ent(&cpuid_entries[nent], func, 0,
+ &nent, cpuid->nent);
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+
+ do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
+ limit = cpuid_entries[nent - 1].eax;
+ for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
+ do_cpuid_ent(&cpuid_entries[nent], func, 0,
+ &nent, cpuid->nent);
+
+
+
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+
+ /* Add support for Centaur's CPUID instruction. */
+ if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR) {
+ do_cpuid_ent(&cpuid_entries[nent], 0xC0000000, 0,
+ &nent, cpuid->nent);
+
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+
+ limit = cpuid_entries[nent - 1].eax;
+ for (func = 0xC0000001;
+ func <= limit && nent < cpuid->nent; ++func)
+ do_cpuid_ent(&cpuid_entries[nent], func, 0,
+ &nent, cpuid->nent);
+
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+ }
+
+ do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
+ cpuid->nent);
+
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+
+ do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent,
+ cpuid->nent);
+
+ r = -E2BIG;
+ if (nent >= cpuid->nent)
+ goto out_free;
+
+ r = -EFAULT;
+ if (copy_to_user(entries, cpuid_entries,
+ nent * sizeof(struct kvm_cpuid_entry2)))
+ goto out_free;
+ cpuid->nent = nent;
+ r = 0;
+
+out_free:
+ vfree(cpuid_entries);
+out:
+ return r;
+}
+
+static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
+{
+ struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
+ int j, nent = vcpu->arch.cpuid_nent;
+
+ e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
+ /* when no next entry is found, the current entry[i] is reselected */
+ for (j = i + 1; ; j = (j + 1) % nent) {
+ struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
+ if (ej->function == e->function) {
+ ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
+ return j;
+ }
+ }
+ return 0; /* silence gcc, even though control never reaches here */
+}
+
+/* find an entry with matching function, matching index (if needed), and that
+ * should be read next (if it's stateful) */
+static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
+ u32 function, u32 index)
+{
+ if (e->function != function)
+ return 0;
+ if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
+ return 0;
+ if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
+ !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
+ return 0;
+ return 1;
+}
+
+struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
+ u32 function, u32 index)
+{
+ int i;
+ struct kvm_cpuid_entry2 *best = NULL;
+
+ for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
+ struct kvm_cpuid_entry2 *e;
+
+ e = &vcpu->arch.cpuid_entries[i];
+ if (is_matching_cpuid_entry(e, function, index)) {
+ if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
+ move_to_next_stateful_cpuid_entry(vcpu, i);
+ best = e;
+ break;
+ }
+ }
+ return best;
+}
+EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
+
+int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
+ if (!best || best->eax < 0x80000008)
+ goto not_found;
+ best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
+ if (best)
+ return best->eax & 0xff;
+not_found:
+ return 36;
+}
+
+/*
+ * If no match is found, check whether we exceed the vCPU's limit
+ * and return the content of the highest valid _standard_ leaf instead.
+ * This is to satisfy the CPUID specification.
+ */
+static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu,
+ u32 function, u32 index)
+{
+ struct kvm_cpuid_entry2 *maxlevel;
+
+ maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
+ if (!maxlevel || maxlevel->eax >= function)
+ return NULL;
+ if (function & 0x80000000) {
+ maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0);
+ if (!maxlevel)
+ return NULL;
+ }
+ return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index);
+}
+
+void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
+{
+ u32 function, index;
+ struct kvm_cpuid_entry2 *best;
+
+ function = kvm_register_read(vcpu, VCPU_REGS_RAX);
+ index = kvm_register_read(vcpu, VCPU_REGS_RCX);
+ kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
+ kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
+ kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
+ kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
+ best = kvm_find_cpuid_entry(vcpu, function, index);
+
+ if (!best)
+ best = check_cpuid_limit(vcpu, function, index);
+
+ if (best) {
+ kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
+ kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
+ kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
+ kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
+ }
+ kvm_x86_ops->skip_emulated_instruction(vcpu);
+ trace_kvm_cpuid(function,
+ kvm_register_read(vcpu, VCPU_REGS_RAX),
+ kvm_register_read(vcpu, VCPU_REGS_RBX),
+ kvm_register_read(vcpu, VCPU_REGS_RCX),
+ kvm_register_read(vcpu, VCPU_REGS_RDX));
+}
+EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
--- /dev/null
+#ifndef ARCH_X86_KVM_CPUID_H
+#define ARCH_X86_KVM_CPUID_H
+
+#include "x86.h"
+
+void kvm_update_cpuid(struct kvm_vcpu *vcpu);
+struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
+ u32 function, u32 index);
+int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries);
+int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid *cpuid,
+ struct kvm_cpuid_entry __user *entries);
+int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries);
+int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries);
+
+
+static inline bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 1, 0);
+ return best && (best->ecx & bit(X86_FEATURE_XSAVE));
+}
+
+static inline bool guest_cpuid_has_smep(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 7, 0);
+ return best && (best->ebx & bit(X86_FEATURE_SMEP));
+}
+
+static inline bool guest_cpuid_has_fsgsbase(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *best;
+
+ best = kvm_find_cpuid_entry(vcpu, 7, 0);
+ return best && (best->ebx & bit(X86_FEATURE_FSGSBASE));
+}
+
+#endif
#include "irq.h"
#include "trace.h"
#include "x86.h"
+#include "cpuid.h"
#ifndef CONFIG_X86_64
#define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
#include "irq.h"
#include "mmu.h"
+#include "cpuid.h"
#include <linux/kvm_host.h>
#include <linux/module.h>
#include "tss.h"
#include "kvm_cache_regs.h"
#include "x86.h"
+#include "cpuid.h"
#include <linux/clocksource.h>
#include <linux/interrupt.h>
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
static void update_cr8_intercept(struct kvm_vcpu *vcpu);
-static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
- struct kvm_cpuid_entry2 __user *entries);
static void process_nmi(struct kvm_vcpu *vcpu);
struct kvm_x86_ops *kvm_x86_ops;
}
EXPORT_SYMBOL_GPL(kvm_set_xcr);
-static bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu)
-{
- struct kvm_cpuid_entry2 *best;
-
- best = kvm_find_cpuid_entry(vcpu, 1, 0);
- return best && (best->ecx & bit(X86_FEATURE_XSAVE));
-}
-
-static bool guest_cpuid_has_smep(struct kvm_vcpu *vcpu)
-{
- struct kvm_cpuid_entry2 *best;
-
- best = kvm_find_cpuid_entry(vcpu, 7, 0);
- return best && (best->ebx & bit(X86_FEATURE_SMEP));
-}
-
-static bool guest_cpuid_has_fsgsbase(struct kvm_vcpu *vcpu)
-{
- struct kvm_cpuid_entry2 *best;
-
- best = kvm_find_cpuid_entry(vcpu, 7, 0);
- return best && (best->ebx & bit(X86_FEATURE_FSGSBASE));
-}
-
-static void update_cpuid(struct kvm_vcpu *vcpu)
-{
- struct kvm_cpuid_entry2 *best;
- struct kvm_lapic *apic = vcpu->arch.apic;
-
- best = kvm_find_cpuid_entry(vcpu, 1, 0);
- if (!best)
- return;
-
- /* Update OSXSAVE bit */
- if (cpu_has_xsave && best->function == 0x1) {
- best->ecx &= ~(bit(X86_FEATURE_OSXSAVE));
- if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
- best->ecx |= bit(X86_FEATURE_OSXSAVE);
- }
-
- if (apic) {
- if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER))
- apic->lapic_timer.timer_mode_mask = 3 << 17;
- else
- apic->lapic_timer.timer_mode_mask = 1 << 17;
- }
-}
-
int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long old_cr4 = kvm_read_cr4(vcpu);
kvm_mmu_reset_context(vcpu);
if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
- update_cpuid(vcpu);
+ kvm_update_cpuid(vcpu);
return 0;
}
vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
}
-static int is_efer_nx(void)
-{
- unsigned long long efer = 0;
-
- rdmsrl_safe(MSR_EFER, &efer);
- return efer & EFER_NX;
-}
-
-static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
-{
- int i;
- struct kvm_cpuid_entry2 *e, *entry;
-
- entry = NULL;
- for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
- e = &vcpu->arch.cpuid_entries[i];
- if (e->function == 0x80000001) {
- entry = e;
- break;
- }
- }
- if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
- entry->edx &= ~(1 << 20);
- printk(KERN_INFO "kvm: guest NX capability removed\n");
- }
-}
-
-/* when an old userspace process fills a new kernel module */
-static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
- struct kvm_cpuid *cpuid,
- struct kvm_cpuid_entry __user *entries)
-{
- int r, i;
- struct kvm_cpuid_entry *cpuid_entries;
-
- r = -E2BIG;
- if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
- goto out;
- r = -ENOMEM;
- cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
- if (!cpuid_entries)
- goto out;
- r = -EFAULT;
- if (copy_from_user(cpuid_entries, entries,
- cpuid->nent * sizeof(struct kvm_cpuid_entry)))
- goto out_free;
- for (i = 0; i < cpuid->nent; i++) {
- vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
- vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
- vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
- vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
- vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
- vcpu->arch.cpuid_entries[i].index = 0;
- vcpu->arch.cpuid_entries[i].flags = 0;
- vcpu->arch.cpuid_entries[i].padding[0] = 0;
- vcpu->arch.cpuid_entries[i].padding[1] = 0;
- vcpu->arch.cpuid_entries[i].padding[2] = 0;
- }
- vcpu->arch.cpuid_nent = cpuid->nent;
- cpuid_fix_nx_cap(vcpu);
- r = 0;
- kvm_apic_set_version(vcpu);
- kvm_x86_ops->cpuid_update(vcpu);
- update_cpuid(vcpu);
-
-out_free:
- vfree(cpuid_entries);
-out:
- return r;
-}
-
-static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
- struct kvm_cpuid2 *cpuid,
- struct kvm_cpuid_entry2 __user *entries)
-{
- int r;
-
- r = -E2BIG;
- if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
- goto out;
- r = -EFAULT;
- if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
- cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
- goto out;
- vcpu->arch.cpuid_nent = cpuid->nent;
- kvm_apic_set_version(vcpu);
- kvm_x86_ops->cpuid_update(vcpu);
- update_cpuid(vcpu);
- return 0;
-
-out:
- return r;
-}
-
-static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
- struct kvm_cpuid2 *cpuid,
- struct kvm_cpuid_entry2 __user *entries)
-{
- int r;
-
- r = -E2BIG;
- if (cpuid->nent < vcpu->arch.cpuid_nent)
- goto out;
- r = -EFAULT;
- if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
- vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
- goto out;
- return 0;
-
-out:
- cpuid->nent = vcpu->arch.cpuid_nent;
- return r;
-}
-
-static void cpuid_mask(u32 *word, int wordnum)
-{
- *word &= boot_cpu_data.x86_capability[wordnum];
-}
-
-static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
- u32 index)
-{
- entry->function = function;
- entry->index = index;
- cpuid_count(entry->function, entry->index,
- &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
- entry->flags = 0;
-}
-
-static bool supported_xcr0_bit(unsigned bit)
-{
- u64 mask = ((u64)1 << bit);
-
- return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0;
-}
-
-#define F(x) bit(X86_FEATURE_##x)
-
-static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
- u32 index, int *nent, int maxnent)
-{
- unsigned f_nx = is_efer_nx() ? F(NX) : 0;
-#ifdef CONFIG_X86_64
- unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
- ? F(GBPAGES) : 0;
- unsigned f_lm = F(LM);
-#else
- unsigned f_gbpages = 0;
- unsigned f_lm = 0;
-#endif
- unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
-
- /* cpuid 1.edx */
- const u32 kvm_supported_word0_x86_features =
- F(FPU) | F(VME) | F(DE) | F(PSE) |
- F(TSC) | F(MSR) | F(PAE) | F(MCE) |
- F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
- F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
- F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
- 0 /* Reserved, DS, ACPI */ | F(MMX) |
- F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
- 0 /* HTT, TM, Reserved, PBE */;
- /* cpuid 0x80000001.edx */
- const u32 kvm_supported_word1_x86_features =
- F(FPU) | F(VME) | F(DE) | F(PSE) |
- F(TSC) | F(MSR) | F(PAE) | F(MCE) |
- F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
- F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
- F(PAT) | F(PSE36) | 0 /* Reserved */ |
- f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
- F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
- 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
- /* cpuid 1.ecx */
- const u32 kvm_supported_word4_x86_features =
- F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
- 0 /* DS-CPL, VMX, SMX, EST */ |
- 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
- 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
- 0 /* Reserved, DCA */ | F(XMM4_1) |
- F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
- 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
- F(F16C) | F(RDRAND);
- /* cpuid 0x80000001.ecx */
- const u32 kvm_supported_word6_x86_features =
- F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
- F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
- F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
- 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
-
- /* cpuid 0xC0000001.edx */
- const u32 kvm_supported_word5_x86_features =
- F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
- F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
- F(PMM) | F(PMM_EN);
-
- /* cpuid 7.0.ebx */
- const u32 kvm_supported_word9_x86_features =
- F(SMEP) | F(FSGSBASE) | F(ERMS);
-
- /* all calls to cpuid_count() should be made on the same cpu */
- get_cpu();
- do_cpuid_1_ent(entry, function, index);
- ++*nent;
-
- switch (function) {
- case 0:
- entry->eax = min(entry->eax, (u32)0xd);
- break;
- case 1:
- entry->edx &= kvm_supported_word0_x86_features;
- cpuid_mask(&entry->edx, 0);
- entry->ecx &= kvm_supported_word4_x86_features;
- cpuid_mask(&entry->ecx, 4);
- /* we support x2apic emulation even if host does not support
- * it since we emulate x2apic in software */
- entry->ecx |= F(X2APIC);
- break;
- /* function 2 entries are STATEFUL. That is, repeated cpuid commands
- * may return different values. This forces us to get_cpu() before
- * issuing the first command, and also to emulate this annoying behavior
- * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
- case 2: {
- int t, times = entry->eax & 0xff;
-
- entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
- entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
- for (t = 1; t < times && *nent < maxnent; ++t) {
- do_cpuid_1_ent(&entry[t], function, 0);
- entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
- ++*nent;
- }
- break;
- }
- /* function 4 has additional index. */
- case 4: {
- int i, cache_type;
-
- entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- /* read more entries until cache_type is zero */
- for (i = 1; *nent < maxnent; ++i) {
- cache_type = entry[i - 1].eax & 0x1f;
- if (!cache_type)
- break;
- do_cpuid_1_ent(&entry[i], function, i);
- entry[i].flags |=
- KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- ++*nent;
- }
- break;
- }
- case 7: {
- entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- /* Mask ebx against host capbability word 9 */
- if (index == 0) {
- entry->ebx &= kvm_supported_word9_x86_features;
- cpuid_mask(&entry->ebx, 9);
- } else
- entry->ebx = 0;
- entry->eax = 0;
- entry->ecx = 0;
- entry->edx = 0;
- break;
- }
- case 9:
- break;
- /* function 0xb has additional index. */
- case 0xb: {
- int i, level_type;
-
- entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- /* read more entries until level_type is zero */
- for (i = 1; *nent < maxnent; ++i) {
- level_type = entry[i - 1].ecx & 0xff00;
- if (!level_type)
- break;
- do_cpuid_1_ent(&entry[i], function, i);
- entry[i].flags |=
- KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- ++*nent;
- }
- break;
- }
- case 0xd: {
- int idx, i;
-
- entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- for (idx = 1, i = 1; *nent < maxnent && idx < 64; ++idx) {
- do_cpuid_1_ent(&entry[i], function, idx);
- if (entry[i].eax == 0 || !supported_xcr0_bit(idx))
- continue;
- entry[i].flags |=
- KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- ++*nent;
- ++i;
- }
- break;
- }
- case KVM_CPUID_SIGNATURE: {
- char signature[12] = "KVMKVMKVM\0\0";
- u32 *sigptr = (u32 *)signature;
- entry->eax = 0;
- entry->ebx = sigptr[0];
- entry->ecx = sigptr[1];
- entry->edx = sigptr[2];
- break;
- }
- case KVM_CPUID_FEATURES:
- entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
- (1 << KVM_FEATURE_NOP_IO_DELAY) |
- (1 << KVM_FEATURE_CLOCKSOURCE2) |
- (1 << KVM_FEATURE_ASYNC_PF) |
- (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
-
- if (sched_info_on())
- entry->eax |= (1 << KVM_FEATURE_STEAL_TIME);
-
- entry->ebx = 0;
- entry->ecx = 0;
- entry->edx = 0;
- break;
- case 0x80000000:
- entry->eax = min(entry->eax, 0x8000001a);
- break;
- case 0x80000001:
- entry->edx &= kvm_supported_word1_x86_features;
- cpuid_mask(&entry->edx, 1);
- entry->ecx &= kvm_supported_word6_x86_features;
- cpuid_mask(&entry->ecx, 6);
- break;
- case 0x80000008: {
- unsigned g_phys_as = (entry->eax >> 16) & 0xff;
- unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
- unsigned phys_as = entry->eax & 0xff;
-
- if (!g_phys_as)
- g_phys_as = phys_as;
- entry->eax = g_phys_as | (virt_as << 8);
- entry->ebx = entry->edx = 0;
- break;
- }
- case 0x80000019:
- entry->ecx = entry->edx = 0;
- break;
- case 0x8000001a:
- break;
- case 0x8000001d:
- break;
- /*Add support for Centaur's CPUID instruction*/
- case 0xC0000000:
- /*Just support up to 0xC0000004 now*/
- entry->eax = min(entry->eax, 0xC0000004);
- break;
- case 0xC0000001:
- entry->edx &= kvm_supported_word5_x86_features;
- cpuid_mask(&entry->edx, 5);
- break;
- case 3: /* Processor serial number */
- case 5: /* MONITOR/MWAIT */
- case 6: /* Thermal management */
- case 0xA: /* Architectural Performance Monitoring */
- case 0x80000007: /* Advanced power management */
- case 0xC0000002:
- case 0xC0000003:
- case 0xC0000004:
- default:
- entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
- break;
- }
-
- kvm_x86_ops->set_supported_cpuid(function, entry);
-
- put_cpu();
-}
-
-#undef F
-
-static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
- struct kvm_cpuid_entry2 __user *entries)
-{
- struct kvm_cpuid_entry2 *cpuid_entries;
- int limit, nent = 0, r = -E2BIG;
- u32 func;
-
- if (cpuid->nent < 1)
- goto out;
- if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
- cpuid->nent = KVM_MAX_CPUID_ENTRIES;
- r = -ENOMEM;
- cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
- if (!cpuid_entries)
- goto out;
-
- do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
- limit = cpuid_entries[0].eax;
- for (func = 1; func <= limit && nent < cpuid->nent; ++func)
- do_cpuid_ent(&cpuid_entries[nent], func, 0,
- &nent, cpuid->nent);
- r = -E2BIG;
- if (nent >= cpuid->nent)
- goto out_free;
-
- do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
- limit = cpuid_entries[nent - 1].eax;
- for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
- do_cpuid_ent(&cpuid_entries[nent], func, 0,
- &nent, cpuid->nent);
-
-
-
- r = -E2BIG;
- if (nent >= cpuid->nent)
- goto out_free;
-
- /* Add support for Centaur's CPUID instruction. */
- if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR) {
- do_cpuid_ent(&cpuid_entries[nent], 0xC0000000, 0,
- &nent, cpuid->nent);
-
- r = -E2BIG;
- if (nent >= cpuid->nent)
- goto out_free;
-
- limit = cpuid_entries[nent - 1].eax;
- for (func = 0xC0000001;
- func <= limit && nent < cpuid->nent; ++func)
- do_cpuid_ent(&cpuid_entries[nent], func, 0,
- &nent, cpuid->nent);
-
- r = -E2BIG;
- if (nent >= cpuid->nent)
- goto out_free;
- }
-
- do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
- cpuid->nent);
-
- r = -E2BIG;
- if (nent >= cpuid->nent)
- goto out_free;
-
- do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent,
- cpuid->nent);
-
- r = -E2BIG;
- if (nent >= cpuid->nent)
- goto out_free;
-
- r = -EFAULT;
- if (copy_to_user(entries, cpuid_entries,
- nent * sizeof(struct kvm_cpuid_entry2)))
- goto out_free;
- cpuid->nent = nent;
- r = 0;
-
-out_free:
- vfree(cpuid_entries);
-out:
- return r;
-}
-
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
return emulator_write_emulated(ctxt, rip, instruction, 3, NULL);
}
-static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
-{
- struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
- int j, nent = vcpu->arch.cpuid_nent;
-
- e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
- /* when no next entry is found, the current entry[i] is reselected */
- for (j = i + 1; ; j = (j + 1) % nent) {
- struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
- if (ej->function == e->function) {
- ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
- return j;
- }
- }
- return 0; /* silence gcc, even though control never reaches here */
-}
-
-/* find an entry with matching function, matching index (if needed), and that
- * should be read next (if it's stateful) */
-static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
- u32 function, u32 index)
-{
- if (e->function != function)
- return 0;
- if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
- return 0;
- if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
- !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
- return 0;
- return 1;
-}
-
-struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
- u32 function, u32 index)
-{
- int i;
- struct kvm_cpuid_entry2 *best = NULL;
-
- for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
- struct kvm_cpuid_entry2 *e;
-
- e = &vcpu->arch.cpuid_entries[i];
- if (is_matching_cpuid_entry(e, function, index)) {
- if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
- move_to_next_stateful_cpuid_entry(vcpu, i);
- best = e;
- break;
- }
- }
- return best;
-}
-EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
-
-int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
-{
- struct kvm_cpuid_entry2 *best;
-
- best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
- if (!best || best->eax < 0x80000008)
- goto not_found;
- best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
- if (best)
- return best->eax & 0xff;
-not_found:
- return 36;
-}
-
-/*
- * If no match is found, check whether we exceed the vCPU's limit
- * and return the content of the highest valid _standard_ leaf instead.
- * This is to satisfy the CPUID specification.
- */
-static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu,
- u32 function, u32 index)
-{
- struct kvm_cpuid_entry2 *maxlevel;
-
- maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
- if (!maxlevel || maxlevel->eax >= function)
- return NULL;
- if (function & 0x80000000) {
- maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0);
- if (!maxlevel)
- return NULL;
- }
- return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index);
-}
-
-void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
-{
- u32 function, index;
- struct kvm_cpuid_entry2 *best;
-
- function = kvm_register_read(vcpu, VCPU_REGS_RAX);
- index = kvm_register_read(vcpu, VCPU_REGS_RCX);
- kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
- kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
- kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
- kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
- best = kvm_find_cpuid_entry(vcpu, function, index);
-
- if (!best)
- best = check_cpuid_limit(vcpu, function, index);
-
- if (best) {
- kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
- kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
- kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
- kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
- }
- kvm_x86_ops->skip_emulated_instruction(vcpu);
- trace_kvm_cpuid(function,
- kvm_register_read(vcpu, VCPU_REGS_RAX),
- kvm_register_read(vcpu, VCPU_REGS_RBX),
- kvm_register_read(vcpu, VCPU_REGS_RCX),
- kvm_register_read(vcpu, VCPU_REGS_RDX));
-}
-EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
-
/*
* Check if userspace requested an interrupt window, and that the
* interrupt window is open.
mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
if (sregs->cr4 & X86_CR4_OSXSAVE)
- update_cpuid(vcpu);
+ kvm_update_cpuid(vcpu);
idx = srcu_read_lock(&vcpu->kvm->srcu);
if (!is_long_mode(vcpu) && is_pae(vcpu)) {
return (nr == BP_VECTOR) || (nr == OF_VECTOR);
}
-struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
- u32 function, u32 index);
-
static inline bool is_protmode(struct kvm_vcpu *vcpu)
{
return kvm_read_cr0_bits(vcpu, X86_CR0_PE);
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception);
+extern u64 host_xcr0;
+
#endif
projects / linux-flexiantxendom0-3.2.10.git / commitdiff