[PATCH 06/10] KVM: arm: add trap handlers for 32-bit debug registers
Zhichao Huang
zhichao.huang at linaro.org
Fri May 15 21:45:47 PDT 2015
Add handlers for all the 32-bit debug registers.
Signed-off-by: Zhichao Huang <zhichao.huang at linaro.org>
---
arch/arm/include/asm/kvm_asm.h | 12 ++++
arch/arm/include/asm/kvm_host.h | 3 +
arch/arm/kernel/asm-offsets.c | 1 +
arch/arm/kvm/coproc.c | 122 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 138 insertions(+)
diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
index 25410b2..ba65e05 100644
--- a/arch/arm/include/asm/kvm_asm.h
+++ b/arch/arm/include/asm/kvm_asm.h
@@ -52,6 +52,18 @@
#define c10_AMAIR1 30 /* Auxilary Memory Attribute Indirection Reg1 */
#define NR_CP15_REGS 31 /* Number of regs (incl. invalid) */
+/* 0 is reserved as an invalid value. */
+#define cp14_DBGBVR0 1 /* Debug Breakpoint Control Registers (0-15) */
+#define cp14_DBGBVR15 16
+#define cp14_DBGBCR0 17 /* Debug Breakpoint Value Registers (0-15) */
+#define cp14_DBGBCR15 32
+#define cp14_DBGWVR0 33 /* Debug Watchpoint Control Registers (0-15) */
+#define cp14_DBGWVR15 48
+#define cp14_DBGWCR0 49 /* Debug Watchpoint Value Registers (0-15) */
+#define cp14_DBGWCR15 64
+#define cp14_DBGDSCRext 65 /* Debug Status and Control external */
+#define NR_CP14_REGS 66 /* Number of regs (incl. invalid) */
+
#define ARM_EXCEPTION_RESET 0
#define ARM_EXCEPTION_UNDEFINED 1
#define ARM_EXCEPTION_SOFTWARE 2
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index d71607c..3d16820 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -124,6 +124,9 @@ struct kvm_vcpu_arch {
struct vgic_cpu vgic_cpu;
struct arch_timer_cpu timer_cpu;
+ /* System control coprocessor (cp14) */
+ u32 cp14[NR_CP14_REGS];
+
/*
* Anything that is not used directly from assembly code goes
* here.
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 871b826..9158de0 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -172,6 +172,7 @@ int main(void)
#ifdef CONFIG_KVM_ARM_HOST
DEFINE(VCPU_KVM, offsetof(struct kvm_vcpu, kvm));
DEFINE(VCPU_MIDR, offsetof(struct kvm_vcpu, arch.midr));
+ DEFINE(VCPU_CP14, offsetof(struct kvm_vcpu, arch.cp14));
DEFINE(VCPU_CP15, offsetof(struct kvm_vcpu, arch.cp15));
DEFINE(VCPU_VFP_GUEST, offsetof(struct kvm_vcpu, arch.vfp_guest));
DEFINE(VCPU_VFP_HOST, offsetof(struct kvm_vcpu, arch.host_cpu_context));
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index 16d5f69..3d7c09e 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -220,6 +220,47 @@ bool access_vm_reg(struct kvm_vcpu *vcpu,
return true;
}
+static bool trap_debug32(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ if (p->is_write)
+ vcpu->arch.cp14[r->reg] = *vcpu_reg(vcpu, p->Rt1);
+ else
+ *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp14[r->reg];
+
+ return true;
+}
+
+/* DBGIDR (RO) Debug ID */
+static bool trap_dbgidr(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ u32 val;
+
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+
+ ARM_DBG_READ(c0, c0, 0, val);
+ *vcpu_reg(vcpu, p->Rt1) = val;
+
+ return true;
+}
+
+/* DBGDSCRint (RO) Debug Status and Control Register */
+static bool trap_dbgdscr(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+
+ *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp14[r->reg];
+
+ return true;
+}
+
/*
* We could trap ID_DFR0 and tell the guest we don't support performance
* monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was
@@ -375,7 +416,88 @@ static const struct coproc_reg cp15_regs[] = {
{ CRn(15), CRm( 0), Op1( 4), Op2( 0), is32, access_cbar},
};
+#define DBG_BCR_BVR_WCR_WVR(n) \
+ /* DBGBVRn */ \
+ { CRn( 0), CRm((n)), Op1( 0), Op2( 4), is32, \
+ trap_debug32, NULL, (cp14_DBGBVR0 + (n)) }, \
+ /* DBGBCRn */ \
+ { CRn( 0), CRm((n)), Op1( 0), Op2( 5), is32, \
+ trap_debug32, NULL, (cp14_DBGBCR0 + (n)) }, \
+ /* DBGWVRn */ \
+ { CRn( 0), CRm((n)), Op1( 0), Op2( 6), is32, \
+ trap_debug32, NULL, (cp14_DBGWVR0 + (n)) }, \
+ /* DBGWCRn */ \
+ { CRn( 0), CRm((n)), Op1( 0), Op2( 7), is32, \
+ trap_debug32, NULL, (cp14_DBGWCR0 + (n)) }
+
+/* No OS DBGBXVR machanism implemented. */
+#define DBGBXVR(n) \
+ { CRn( 1), CRm((n)), Op1( 0), Op2( 1), is32, trap_raz_wi }
+
+/*
+ * Trapped cp14 registers. We generally ignore most of the external
+ * debug, on the principle that they don't really make sense to a
+ * guest. Revisit this one day, whould this principle change.
+ */
static const struct coproc_reg cp14_regs[] = {
+ /* DBGIDR */
+ { CRn( 0), CRm( 0), Op1( 0), Op2( 0), is32, trap_dbgidr},
+ /* DBGDTRRXext */
+ { CRn( 0), CRm( 0), Op1( 0), Op2( 2), is32, trap_raz_wi },
+ DBG_BCR_BVR_WCR_WVR(0),
+ /* DBGDSCRint */
+ { CRn( 0), CRm( 1), Op1( 0), Op2( 0), is32, trap_dbgdscr,
+ NULL, cp14_DBGDSCRext },
+ DBG_BCR_BVR_WCR_WVR(1),
+ /* DBGDSCRext */
+ { CRn( 0), CRm( 2), Op1( 0), Op2( 2), is32, trap_debug32,
+ NULL, cp14_DBGDSCRext },
+ DBG_BCR_BVR_WCR_WVR(2),
+ /* DBGDTRRXext */
+ { CRn( 0), CRm( 3), Op1( 0), Op2( 2), is32, trap_raz_wi },
+ DBG_BCR_BVR_WCR_WVR(3),
+ DBG_BCR_BVR_WCR_WVR(4),
+ /* DBGDTR[RT]Xint */
+ { CRn( 0), CRm( 5), Op1( 0), Op2( 0), is32, trap_raz_wi },
+ DBG_BCR_BVR_WCR_WVR(5),
+ DBG_BCR_BVR_WCR_WVR(6),
+ /* DBGVCR */
+ { CRn( 0), CRm( 7), Op1( 0), Op2( 0), is32, trap_debug32 },
+ DBG_BCR_BVR_WCR_WVR(7),
+ DBG_BCR_BVR_WCR_WVR(8),
+ DBG_BCR_BVR_WCR_WVR(9),
+ DBG_BCR_BVR_WCR_WVR(10),
+ DBG_BCR_BVR_WCR_WVR(11),
+ DBG_BCR_BVR_WCR_WVR(12),
+ DBG_BCR_BVR_WCR_WVR(13),
+ DBG_BCR_BVR_WCR_WVR(14),
+ DBG_BCR_BVR_WCR_WVR(15),
+
+ DBGBXVR(0),
+ /* DBGOSLAR */
+ { CRn( 1), CRm( 0), Op1( 0), Op2( 4), is32, trap_raz_wi },
+ DBGBXVR(1),
+ /* DBGOSLSR */
+ { CRn( 1), CRm( 1), Op1( 0), Op2( 4), is32, trap_raz_wi },
+ DBGBXVR(2),
+ DBGBXVR(3),
+ /* DBGOSDLRd */
+ { CRn( 1), CRm( 3), Op1( 0), Op2( 4), is32, trap_raz_wi },
+ DBGBXVR(4),
+ DBGBXVR(5),
+ /* DBGPRSRa */
+ { CRn( 1), CRm( 5), Op1( 0), Op2( 4), is32, trap_raz_wi },
+
+ DBGBXVR(6),
+ DBGBXVR(7),
+ DBGBXVR(8),
+ DBGBXVR(9),
+ DBGBXVR(10),
+ DBGBXVR(11),
+ DBGBXVR(12),
+ DBGBXVR(13),
+ DBGBXVR(14),
+ DBGBXVR(15),
};
/* Target specific emulation tables */
--
1.7.12.4
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