linux-kernel - [PATCH v2 1/4] KVM: X86: Add arrays to save/restore LBR MSRs

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Date:	Fri, 23 Oct 2015 17:15:15 +0800
From:	Jian Zhou <jianjay.zhou@...wei.com>
To:	<kvm@...r.kernel.org>, <pbonzini@...hat.com>, <gleb@...nel.org>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>
CC:	<herongguang.he@...wei.com>, <zhang.zhanghailiang@...wei.com>,
	<weidong.huang@...wei.com>, <peter.huangpeng@...wei.com>,
	Jian Zhou <jianjay.zhou@...wei.com>
Subject: [PATCH v2 1/4] KVM: X86: Add arrays to save/restore LBR MSRs

Add arrays in kvm_vcpu_arch struct to save/restore
LBR MSRs at vm exit/entry time.
Add new hooks to set/get DEBUGCTLMSR and LBR MSRs.

Signed-off-by: Jian Zhou <jianjay.zhou@...wei.com>
Signed-off-by: Stephen He <herongguang.he@...wei.com>
---
 arch/x86/include/asm/kvm_host.h | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 3a36ee7..dc2c120 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -376,6 +376,12 @@ struct kvm_vcpu_hv {
 	u64 hv_vapic;
 };

+struct msr_data {
+	bool host_initiated;
+	u32 index;
+	u64 data;
+};
+
 struct kvm_vcpu_arch {
 	/*
 	 * rip and regs accesses must go through
@@ -516,6 +522,15 @@ struct kvm_vcpu_arch {
 	unsigned long eff_db[KVM_NR_DB_REGS];
 	unsigned long guest_debug_dr7;

+	int lbr_status;
+	int lbr_used;
+
+	struct lbr_msr {
+		unsigned nr;
+		struct msr_data guest[MAX_NUM_LBR_MSRS];
+		struct msr_data host[MAX_NUM_LBR_MSRS];
+	}lbr_msr;
+
 	u64 mcg_cap;
 	u64 mcg_status;
 	u64 mcg_ctl;
@@ -728,12 +743,6 @@ struct kvm_vcpu_stat {

 struct x86_instruction_info;

-struct msr_data {
-	bool host_initiated;
-	u32 index;
-	u64 data;
-};
-
 struct kvm_lapic_irq {
 	u32 vector;
 	u16 delivery_mode;
@@ -887,6 +896,11 @@ struct kvm_x86_ops {
 					   gfn_t offset, unsigned long mask);
 	/* pmu operations of sub-arch */
 	const struct kvm_pmu_ops *pmu_ops;
+
+	int (*set_debugctlmsr)(struct kvm_vcpu *vcpu, u64 value);
+	u64 (*get_debugctlmsr)(void);
+	void (*set_lbr_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 data);
+	u64 (*get_lbr_msr)(struct kvm_vcpu *vcpu, u32 msr);
 };

 struct kvm_arch_async_pf {
--
1.7.12.4


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