linux-kernel - [PATCH V4 06/11] KVM: x86: Add a function to get the number of address ranges

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1512937857-10477-7-git-send-email-luwei.kang@intel.com>
Date:   Mon, 11 Dec 2017 04:30:52 +0800
From:   Luwei Kang <luwei.kang@...el.com>
To:     kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        x86@...nel.org, pbonzini@...hat.com, rkrcmar@...hat.com,
        linux-kernel@...r.kernel.org, joro@...tes.org,
        Luwei Kang <luwei.kang@...el.com>
Subject: [PATCH V4 06/11] KVM: x86: Add a function to get the number of address ranges

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@...el.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