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Subject[PATCH V4 06/11] KVM: x86: Add a function to get the number of address ranges
Date
CPUID.(EAX=14H,ECX=1H).EAX[2:0] enumerates the number of
Intel Processor Trace configurable Address Ranges for filtering.

Signed-off-by: Luwei Kang <luwei.kang@intel.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/x86.c | 13 +++++++++++++
2 files changed, 14 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 6480faa..c120202 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1217,6 +1217,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
bool kvm_rdpmc(struct kvm_vcpu *vcpu);
+unsigned int kvm_get_pt_addr_cnt(void);

void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index faf843c..b19a749 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -991,6 +991,19 @@ bool kvm_rdpmc(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_rdpmc);

+unsigned int kvm_get_pt_addr_cnt(void)
+{
+ unsigned int eax, ebx, ecx, edx;
+ /*
+ * - CPUID function 14H, sub-function 1:
+ * EAX[2:0] enumerates the number of Intel Processor
+ * Trace configurable Address Ranges for filtering.
+ */
+ cpuid_count(0x14, 1, &eax, &ebx, &ecx, &edx);
+ return (eax & 0x7);
+}
+EXPORT_SYMBOL_GPL(kvm_get_pt_addr_cnt);
+
/*
* List of msr numbers which we expose to userspace through KVM_GET_MSRS
* and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
--
1.8.3.1
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