[04/13] KVM: X86: Add x86 callback for intercept check

Commit Message

Joerg Roedel March 28, 2011, 10:46 a.m. UTC

None

Patch

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 366de63..99ea5b4 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -26,6 +26,24 @@  struct x86_exception {
 };
 
 /*
+ * This struct is used to carry enough information from the instruction
+ * decoder to main KVM so that a decision can be made whether the
+ * instruction needs to be intercepted or not.
+ */
+struct x86_instruction_info {
+	u8  intercept;          /* which intercept                      */
+	u8  rep_prefix;         /* rep prefix?                          */
+	u8  modrm_mod;		/* mod part of modrm			*/
+	u8  modrm_reg;          /* index of register used               */
+	u8  modrm_rm;		/* rm part of modrm			*/
+	u64 src_val;            /* value of source operand              */
+	u8  src_bytes;          /* size of source operand               */
+	u8  dst_bytes;          /* size of destination operand          */
+	u8  ad_bytes;           /* size of src/dst address              */
+	u64 next_rip;           /* rip following the instruction        */
+};
+
+/*
  * x86_emulate_ops:
  *
  * These operations represent the instruction emulator's interface to memory.
@@ -161,8 +179,8 @@  struct x86_emulate_ops {
 	int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);
 	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
-	int (*intercept)(struct x86_emulate_ctxt *ctxt,
-			 enum x86_intercept intercept,
+	int (*intercept)(struct kvm_vcpu *vcpu,
+			 struct x86_instruction_info *info,
 			 enum x86_intercept_stage stage);
 };
 
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 35f81b1..4ef32ac 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -504,6 +504,8 @@  struct kvm_vcpu_stat {
 	u32 nmi_injections;
 };
 
+struct x86_instruction_info;
+
 struct kvm_x86_ops {
 	int (*cpu_has_kvm_support)(void);          /* __init */
 	int (*disabled_by_bios)(void);             /* __init */
@@ -591,6 +593,11 @@  struct kvm_x86_ops {
 	void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);
 
 	void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2);
+
+	int (*check_intercept)(struct kvm_vcpu *vcpu,
+			       struct x86_instruction_info *info,
+			       enum x86_intercept_stage stage);
+
 	const struct trace_print_flags *exit_reasons_str;
 };
 
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b05e50d..46dd5bf 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -396,6 +396,26 @@  struct group_dual {
 	(_eip) += (_size);						\
 })
 
+static int emulator_check_intercept(struct x86_emulate_ctxt *ctxt,
+				    enum x86_intercept intercept,
+				    enum x86_intercept_stage stage)
+{
+	struct x86_instruction_info info = {
+		.intercept  = intercept,
+		.rep_prefix = ctxt->decode.rep_prefix,
+		.modrm_mod  = ctxt->decode.modrm_mod,
+		.modrm_reg  = ctxt->decode.modrm_reg,
+		.modrm_rm   = ctxt->decode.modrm_rm,
+		.src_val    = ctxt->decode.src.val64,
+		.src_bytes  = ctxt->decode.src.bytes,
+		.dst_bytes  = ctxt->decode.dst.bytes,
+		.ad_bytes   = ctxt->decode.ad_bytes,
+		.next_rip   = ctxt->eip,
+	};
+
+	return ctxt->ops->intercept(ctxt->vcpu, &info, stage);
+}
+
 static inline unsigned long ad_mask(struct decode_cache *c)
 {
 	return (1UL << (c->ad_bytes << 3)) - 1;
@@ -2987,8 +3007,8 @@  x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 	}
 
 	if (unlikely(ctxt->guest_mode) && c->intercept) {
-		rc = ops->intercept(ctxt, c->intercept,
-				    X86_ICPT_PRE_EXCEPT);
+		rc = emulator_check_intercept(ctxt, c->intercept,
+					      X86_ICPT_PRE_EXCEPT);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 	}
@@ -3000,8 +3020,8 @@  x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 	}
 
 	if (unlikely(ctxt->guest_mode) && c->intercept) {
-		rc = ops->intercept(ctxt, c->intercept,
-				    X86_ICPT_POST_EXCEPT);
+		rc = emulator_check_intercept(ctxt, c->intercept,
+					      X86_ICPT_POST_EXCEPT);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 	}
@@ -3045,8 +3065,8 @@  x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
 special_insn:
 
 	if (unlikely(ctxt->guest_mode) && c->intercept) {
-		rc = ops->intercept(ctxt, c->intercept,
-				    X86_ICPT_POST_MEMACCESS);
+		rc = emulator_check_intercept(ctxt, c->intercept,
+					      X86_ICPT_POST_MEMACCESS);
 		if (rc != X86EMUL_CONTINUE)
 			goto done;
 	}
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index cb43e98..798ebe6 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3868,6 +3868,13 @@  static void svm_fpu_deactivate(struct kvm_vcpu *vcpu)
 	update_cr0_intercept(svm);
 }
 
+static int svm_check_intercept(struct kvm_vcpu *vcpu,
+			       struct x86_instruction_info *info,
+			       enum x86_intercept_stage stage)
+{
+	return X86EMUL_CONTINUE;
+}
+
 static struct kvm_x86_ops svm_x86_ops = {
 	.cpu_has_kvm_support = has_svm,
 	.disabled_by_bios = is_disabled,
@@ -3953,6 +3960,8 @@  static struct kvm_x86_ops svm_x86_ops = {
 	.adjust_tsc_offset = svm_adjust_tsc_offset,
 
 	.set_tdp_cr3 = set_tdp_cr3,
+
+	.check_intercept = svm_check_intercept,
 };
 
 static int __init svm_init(void)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2b99ae7..3dfefe3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4409,6 +4409,13 @@  static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
 {
 }
 
+static int vmx_check_intercept(struct kvm_vcpu *vcpu,
+			       struct x86_instruction_info *info,
+			       enum x86_intercept_stage stage)
+{
+	return X86EMUL_CONTINUE;
+}
+
 static struct kvm_x86_ops vmx_x86_ops = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
 	.disabled_by_bios = vmx_disabled_by_bios,
@@ -4494,6 +4501,8 @@  static struct kvm_x86_ops vmx_x86_ops = {
 	.adjust_tsc_offset = vmx_adjust_tsc_offset,
 
 	.set_tdp_cr3 = vmx_set_cr3,
+
+	.check_intercept = vmx_check_intercept,
 };
 
 static int __init vmx_init(void)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 292b158..2b43606 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4242,11 +4242,11 @@  static void emulator_set_segment_selector(u16 sel, int seg,
 	kvm_set_segment(vcpu, &kvm_seg, seg);
 }
 
-static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
-			      enum x86_intercept intercept,
+static int emulator_intercept(struct kvm_vcpu *vcpu,
+			      struct x86_instruction_info *info,
 			      enum x86_intercept_stage stage)
 {
-	return X86EMUL_CONTINUE;
+	return kvm_x86_ops->check_intercept(vcpu, info, stage);
 }
 
 static struct x86_emulate_ops emulate_ops = {