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Commit 00b27a3e authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Move cpuid code to new file 



The cpuid code has grown; put it into a separate file.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 2b5e97e1

arch/x86/kvm/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -12,7 +12,7 @@ kvm-$(CONFIG_IOMMU_API) += $(addprefix ../../../virt/kvm/, iommu.o) 
kvm-$(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

arch/x86/kvm/cpuid.c

0 → 100644
+625 −0
Original line number Diff line number Diff line 
/*

 * 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);

arch/x86/kvm/cpuid.h

0 → 100644
+46 −0
Original line number Diff line number Diff line 
#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

arch/x86/kvm/lapic.c

+1 −0
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
#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))

arch/x86/kvm/vmx.c

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 


#include "irq.h"

#include "mmu.h"

#include "cpuid.h"



#include <linux/kvm_host.h>

#include <linux/module.h>