4  * cpuid support routines
22 #include "cpuid.h"
102 	 * save the feature bitmap to avoid cpuid lookup for every PV  in kvm_update_pv_runtime()
176 	 * Bits 127:0 of the allowed SECS.ATTRIBUTES (CPUID.0x12.0x1) enumerate  in kvm_vcpu_after_set_cpuid()
237 			     struct kvm_cpuid *cpuid,  in kvm_vcpu_ioctl_set_cpuid()  argument
244 	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)  in kvm_vcpu_ioctl_set_cpuid()
247 	if (cpuid->nent) {  in kvm_vcpu_ioctl_set_cpuid()
248 		e = vmemdup_user(entries, array_size(sizeof(*e), cpuid->nent));  in kvm_vcpu_ioctl_set_cpuid()
252 		e2 = kvmalloc_array(cpuid->nent, sizeof(*e2), GFP_KERNEL_ACCOUNT);  in kvm_vcpu_ioctl_set_cpuid()
258 	for (i = 0; i < cpuid->nent; i++) {  in kvm_vcpu_ioctl_set_cpuid()
271 	r = kvm_check_cpuid(e2, cpuid->nent);  in kvm_vcpu_ioctl_set_cpuid()
279 	vcpu->arch.cpuid_nent = cpuid->nent;  in kvm_vcpu_ioctl_set_cpuid()
291 			      struct kvm_cpuid2 *cpuid,  in kvm_vcpu_ioctl_set_cpuid2()  argument
297 	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)  in kvm_vcpu_ioctl_set_cpuid2()
300 	if (cpuid->nent) {  in kvm_vcpu_ioctl_set_cpuid2()
301 		e2 = vmemdup_user(entries, array_size(sizeof(*e2), cpuid->nent));  in kvm_vcpu_ioctl_set_cpuid2()
306 	r = kvm_check_cpuid(e2, cpuid->nent);  in kvm_vcpu_ioctl_set_cpuid2()
314 	vcpu->arch.cpuid_nent = cpuid->nent;  in kvm_vcpu_ioctl_set_cpuid2()
323 			      struct kvm_cpuid2 *cpuid,  in kvm_vcpu_ioctl_get_cpuid2()  argument
329 	if (cpuid->nent < vcpu->arch.cpuid_nent)  in kvm_vcpu_ioctl_get_cpuid2()
338 	cpuid->nent = vcpu->arch.cpuid_nent;  in kvm_vcpu_ioctl_get_cpuid2()
342 /* Mask kvm_cpu_caps for @leaf with the raw CPUID capabilities of this CPU. */
345 	const struct cpuid_reg cpuid = x86_feature_cpuid(leaf * 32);  in __kvm_cpu_cap_mask()  local
350 	cpuid_count(cpuid.function, cpuid.index,  in __kvm_cpu_cap_mask()
353 	kvm_cpu_caps[leaf] &= *__cpuid_entry_get_reg(&entry, cpuid.reg);  in __kvm_cpu_cap_mask()
397 		 * advertised to guests via CPUID!  in kvm_set_cpu_caps()
666 		 * CPUID(function=2, index=0) may return different results each  in __do_cpuid_func()
668 		 * number of times software should do CPUID(2, 0).  in __do_cpuid_func()
674 		 * APM states that CPUID(2) is reserved.  in __do_cpuid_func()
677 		 * a stateful CPUID.0x2 is encountered.  in __do_cpuid_func()
761 		 * previous entry is zero.  Note, CPUID EAX.{0x1f,0xb}.0 is  in __do_cpuid_func()
907 		/* invariant TSC is CPUID.80000007H:EDX[8] */  in __do_cpuid_func()
968 	/*Add support for Centaur's CPUID instruction*/  in __do_cpuid_func()
1056 int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,  in kvm_dev_ioctl_get_cpuid()  argument
1069 	if (cpuid->nent < 1)  in kvm_dev_ioctl_get_cpuid()
1071 	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)  in kvm_dev_ioctl_get_cpuid()
1072 		cpuid->nent = KVM_MAX_CPUID_ENTRIES;  in kvm_dev_ioctl_get_cpuid()
1074 	if (sanity_check_entries(entries, cpuid->nent, type))  in kvm_dev_ioctl_get_cpuid()
1078 					   cpuid->nent));  in kvm_dev_ioctl_get_cpuid()
1082 	array.maxnent = cpuid->nent;  in kvm_dev_ioctl_get_cpuid()
1089 	cpuid->nent = array.nent;  in kvm_dev_ioctl_get_cpuid()
1109  * Intel CPUID semantics treats any query for an out-of-range leaf as if the
1110  * highest basic leaf (i.e. CPUID.0H:EAX) were requested.  AMD CPUID semantics
1120  * class exists if a guest CPUID entry for its <base> leaf exists.  For a given
1121  * class, CPUID.<base>.EAX contains the max supported leaf for the class.
1131  * CPUID sub-classes are:
1163 	 * entry for CPUID.0xb.index (see below), then the output value for EDX  in get_out_of_range_cpuid_entry()
1164 	 * needs to be pulled from CPUID.0xb.1.  in get_out_of_range_cpuid_entry()
1170 	 * the effective CPUID entry is the max basic leaf.  Note, the index of  in get_out_of_range_cpuid_entry()