KVM: x86: Add x86 callback for intercept check
This patch adds a callback into kvm_x86_ops so that svm and
vmx code can do intercept checks on emulated instructions.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index cab841a..eb7033c 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -26,6 +26,24 @@
};
/*
+ * 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.
@@ -163,8 +181,8 @@
int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
void (*get_fpu)(struct x86_emulate_ctxt *ctxt); /* disables preempt */
void (*put_fpu)(struct x86_emulate_ctxt *ctxt); /* reenables preempt */
- 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 e820c63..038562c 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -505,6 +505,8 @@
u32 nmi_injections;
};
+struct x86_instruction_info;
+
struct kvm_x86_ops {
int (*cpu_has_kvm_support)(void); /* __init */
int (*disabled_by_bios)(void); /* __init */
@@ -592,6 +594,11 @@
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 3f32a66..e3e96ea 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -408,6 +408,26 @@
(_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;
@@ -3132,8 +3152,8 @@
}
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;
}
@@ -3158,8 +3178,8 @@
}
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;
}
@@ -3203,8 +3223,8 @@
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 @@
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 @@
.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 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 @@
.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 99bed74..eebe546 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4297,11 +4297,11 @@
preempt_enable();
}
-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 = {