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be50b2065d
With KVM_CAP_XSAVE, userspace uses a hardcoded 4KB buffer to get/set xstate data from/to KVM. This doesn't work when dynamic xfeatures (e.g. AMX) are exposed to the guest as they require a larger buffer size. Introduce a new capability (KVM_CAP_XSAVE2). Userspace VMM gets the required xstate buffer size via KVM_CHECK_EXTENSION(KVM_CAP_XSAVE2). KVM_SET_XSAVE is extended to work with both legacy and new capabilities by doing properly-sized memdup_user() based on the guest fpu container. KVM_GET_XSAVE is kept for backward-compatible reason. Instead, KVM_GET_XSAVE2 is introduced under KVM_CAP_XSAVE2 as the preferred interface for getting xstate buffer (4KB or larger size) from KVM (Link: https://lkml.org/lkml/2021/12/15/510) Also, update the api doc with the new KVM_GET_XSAVE2 ioctl. Signed-off-by: Guang Zeng <guang.zeng@intel.com> Signed-off-by: Wei Wang <wei.w.wang@intel.com> Signed-off-by: Jing Liu <jing2.liu@intel.com> Signed-off-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Yang Zhong <yang.zhong@intel.com> Message-Id: <20220105123532.12586-19-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
228 lines
5.9 KiB
C
228 lines
5.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef ARCH_X86_KVM_CPUID_H
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#define ARCH_X86_KVM_CPUID_H
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#include "x86.h"
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#include "reverse_cpuid.h"
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#include <asm/cpu.h>
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#include <asm/processor.h>
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#include <uapi/asm/kvm_para.h>
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extern u32 kvm_cpu_caps[NR_KVM_CPU_CAPS] __read_mostly;
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void kvm_set_cpu_caps(void);
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void kvm_update_cpuid_runtime(struct kvm_vcpu *vcpu);
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void kvm_update_pv_runtime(struct kvm_vcpu *vcpu);
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struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
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u32 function, u32 index);
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int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries,
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unsigned int type);
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int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
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struct kvm_cpuid *cpuid,
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struct kvm_cpuid_entry __user *entries);
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int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
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struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries);
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int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
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struct kvm_cpuid2 *cpuid,
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struct kvm_cpuid_entry2 __user *entries);
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bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
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u32 *ecx, u32 *edx, bool exact_only);
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u32 xstate_required_size(u64 xstate_bv, bool compacted);
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int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
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u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);
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static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.maxphyaddr;
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}
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static inline bool kvm_vcpu_is_legal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
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{
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return !(gpa & vcpu->arch.reserved_gpa_bits);
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}
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static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
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{
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return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
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}
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static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
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gpa_t gpa, gpa_t alignment)
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{
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return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
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}
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static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
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{
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return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
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}
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static __always_inline void cpuid_entry_override(struct kvm_cpuid_entry2 *entry,
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unsigned int leaf)
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{
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u32 *reg = cpuid_entry_get_reg(entry, leaf * 32);
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BUILD_BUG_ON(leaf >= ARRAY_SIZE(kvm_cpu_caps));
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*reg = kvm_cpu_caps[leaf];
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}
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static __always_inline u32 *guest_cpuid_get_register(struct kvm_vcpu *vcpu,
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unsigned int x86_feature)
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{
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const struct cpuid_reg cpuid = x86_feature_cpuid(x86_feature);
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struct kvm_cpuid_entry2 *entry;
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entry = kvm_find_cpuid_entry(vcpu, cpuid.function, cpuid.index);
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if (!entry)
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return NULL;
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return __cpuid_entry_get_reg(entry, cpuid.reg);
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}
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static __always_inline bool guest_cpuid_has(struct kvm_vcpu *vcpu,
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unsigned int x86_feature)
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{
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u32 *reg;
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reg = guest_cpuid_get_register(vcpu, x86_feature);
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if (!reg)
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return false;
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return *reg & __feature_bit(x86_feature);
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}
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static __always_inline void guest_cpuid_clear(struct kvm_vcpu *vcpu,
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unsigned int x86_feature)
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{
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u32 *reg;
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reg = guest_cpuid_get_register(vcpu, x86_feature);
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if (reg)
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*reg &= ~__feature_bit(x86_feature);
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}
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static inline bool guest_cpuid_is_amd_or_hygon(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0, 0);
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return best &&
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(is_guest_vendor_amd(best->ebx, best->ecx, best->edx) ||
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is_guest_vendor_hygon(best->ebx, best->ecx, best->edx));
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}
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static inline bool guest_cpuid_is_intel(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0, 0);
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return best && is_guest_vendor_intel(best->ebx, best->ecx, best->edx);
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}
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static inline int guest_cpuid_family(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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if (!best)
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return -1;
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return x86_family(best->eax);
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}
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static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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if (!best)
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return -1;
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return x86_model(best->eax);
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}
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static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid_entry2 *best;
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best = kvm_find_cpuid_entry(vcpu, 0x1, 0);
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if (!best)
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return -1;
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return x86_stepping(best->eax);
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}
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static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu)
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{
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return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_STIBP) ||
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) ||
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD));
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}
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static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu)
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{
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return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) ||
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guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB));
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}
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static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.msr_platform_info & MSR_PLATFORM_INFO_CPUID_FAULT;
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}
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static inline bool cpuid_fault_enabled(struct kvm_vcpu *vcpu)
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{
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return vcpu->arch.msr_misc_features_enables &
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MSR_MISC_FEATURES_ENABLES_CPUID_FAULT;
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}
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static __always_inline void kvm_cpu_cap_clear(unsigned int x86_feature)
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{
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unsigned int x86_leaf = __feature_leaf(x86_feature);
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reverse_cpuid_check(x86_leaf);
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kvm_cpu_caps[x86_leaf] &= ~__feature_bit(x86_feature);
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}
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static __always_inline void kvm_cpu_cap_set(unsigned int x86_feature)
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{
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unsigned int x86_leaf = __feature_leaf(x86_feature);
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reverse_cpuid_check(x86_leaf);
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kvm_cpu_caps[x86_leaf] |= __feature_bit(x86_feature);
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}
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static __always_inline u32 kvm_cpu_cap_get(unsigned int x86_feature)
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{
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unsigned int x86_leaf = __feature_leaf(x86_feature);
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reverse_cpuid_check(x86_leaf);
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return kvm_cpu_caps[x86_leaf] & __feature_bit(x86_feature);
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}
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static __always_inline bool kvm_cpu_cap_has(unsigned int x86_feature)
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{
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return !!kvm_cpu_cap_get(x86_feature);
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}
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static __always_inline void kvm_cpu_cap_check_and_set(unsigned int x86_feature)
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{
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if (boot_cpu_has(x86_feature))
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kvm_cpu_cap_set(x86_feature);
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}
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static __always_inline bool guest_pv_has(struct kvm_vcpu *vcpu,
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unsigned int kvm_feature)
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{
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if (!vcpu->arch.pv_cpuid.enforce)
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return true;
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return vcpu->arch.pv_cpuid.features & (1u << kvm_feature);
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}
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#endif
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