[PATCH 3/9] arm64: KVM: add trap handlers for AArch64 debug registers

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Add handlers for all the AArch64 debug registers that are accessible
from EL0 or EL1. The trapping code keeps track of the state of the
debug registers, allowing for the switch code to implement a lazy
switching strategy.

Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
 arch/arm64/include/asm/kvm_asm.h  |  28 ++++++--
 arch/arm64/include/asm/kvm_host.h |   3 +
 arch/arm64/kvm/sys_regs.c         | 130 +++++++++++++++++++++++++++++++++++++-
 3 files changed, 151 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 9fcd54b..e6b159a 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -43,14 +43,25 @@
 #define	AMAIR_EL1	19	/* Aux Memory Attribute Indirection Register */
 #define	CNTKCTL_EL1	20	/* Timer Control Register (EL1) */
 #define	PAR_EL1		21	/* Physical Address Register */
+#define MDSCR_EL1	22	/* Monitor Debug System Control Register */
+#define DBGBCR0_EL1	23	/* Debug Breakpoint Control Registers (0-15) */
+#define DBGBCR15_EL1	38
+#define DBGBVR0_EL1	39	/* Debug Breakpoint Value Registers (0-15) */
+#define DBGBVR15_EL1	54
+#define DBGWCR0_EL1	55	/* Debug Watchpoint Control Registers (0-15) */
+#define DBGWCR15_EL1	70
+#define DBGWVR0_EL1	71	/* Debug Watchpoint Value Registers (0-15) */
+#define DBGWVR15_EL1	86
+#define MDCCINT_EL1	87	/* Monitor Debug Comms Channel Interrupt Enable Reg */
+
 /* 32bit specific registers. Keep them at the end of the range */
-#define	DACR32_EL2	22	/* Domain Access Control Register */
-#define	IFSR32_EL2	23	/* Instruction Fault Status Register */
-#define	FPEXC32_EL2	24	/* Floating-Point Exception Control Register */
-#define	DBGVCR32_EL2	25	/* Debug Vector Catch Register */
-#define	TEECR32_EL1	26	/* ThumbEE Configuration Register */
-#define	TEEHBR32_EL1	27	/* ThumbEE Handler Base Register */
-#define	NR_SYS_REGS	28
+#define	DACR32_EL2	88	/* Domain Access Control Register */
+#define	IFSR32_EL2	89	/* Instruction Fault Status Register */
+#define	FPEXC32_EL2	90	/* Floating-Point Exception Control Register */
+#define	DBGVCR32_EL2	91	/* Debug Vector Catch Register */
+#define	TEECR32_EL1	92	/* ThumbEE Configuration Register */
+#define	TEEHBR32_EL1	93	/* ThumbEE Handler Base Register */
+#define	NR_SYS_REGS	94
 
 /* 32bit mapping */
 #define c0_MPIDR	(MPIDR_EL1 * 2)	/* MultiProcessor ID Register */
@@ -87,6 +98,9 @@
 #define ARM_EXCEPTION_IRQ	  0
 #define ARM_EXCEPTION_TRAP	  1
 
+#define KVM_ARM64_DEBUG_DIRTY_SHIFT	0
+#define KVM_ARM64_DEBUG_DIRTY		(1 << KVM_ARM64_DEBUG_DIRTY_SHIFT)
+
 #ifndef __ASSEMBLY__
 struct kvm;
 struct kvm_vcpu;
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 0a1d697..4737961 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -101,6 +101,9 @@ struct kvm_vcpu_arch {
 	/* Exception Information */
 	struct kvm_vcpu_fault_info fault;
 
+	/* Debug state */
+	u64 debug_flags;
+
 	/* Pointer to host CPU context */
 	kvm_cpu_context_t *host_cpu_context;
 
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index fc8d4e3..618d4fb 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -30,6 +30,7 @@
 #include <asm/kvm_mmu.h>
 #include <asm/cacheflush.h>
 #include <asm/cputype.h>
+#include <asm/debug-monitors.h>
 #include <trace/events/kvm.h>
 
 #include "sys_regs.h"
@@ -173,6 +174,58 @@ static bool trap_wi_raz(struct kvm_vcpu *vcpu,
 		return read_zero(vcpu, p);
 }
 
+static bool trap_oslsr_el1(struct kvm_vcpu *vcpu,
+			   const struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		return ignore_write(vcpu, p);
+	} else {
+		*vcpu_reg(vcpu, p->Rt) = (1 << 3);
+		return true;
+	}
+}
+
+static bool trap_dbgauthstatus_el1(struct kvm_vcpu *vcpu,
+				   const struct sys_reg_params *p,
+				   const struct sys_reg_desc *r)
+{
+	if (p->is_write) {
+		return ignore_write(vcpu, p);
+	} else {
+		*vcpu_reg(vcpu, p->Rt) = 0x2222; /* Implemented and disabled */
+		return true;
+	}
+}
+
+/*
+ * Trap handler for DBG[BW][CV]Rn_EL1 and MDSCR_EL1. We track the
+ * "dirtiness" of the registers.
+ */
+static bool trap_debug_regs(struct kvm_vcpu *vcpu,
+			    const struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	/*
+	 * The best thing to do would be to trap MDSCR_EL1
+	 * independently, test if DBG_MDSCR_KDE or DBG_MDSCR_MDE is
+	 * getting set, and only set the DIRTY bit in that case.
+	 *
+	 * Unfortunately, "old" Linux kernels tend to hit MDSCR_EL1
+	 * like a woodpecker on a tree, and it is better to disable
+	 * trapping as soon as possible in this case. Some day, make
+	 * this a tuneable...
+	 */
+	if (p->is_write) {
+		vcpu_sys_reg(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt);
+		vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
+	} else {
+		*vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, r->reg);
+	}
+
+	return true;
+}
+
 static void reset_amair_el1(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 {
 	u64 amair;
@@ -189,6 +242,21 @@ static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 	vcpu_sys_reg(vcpu, MPIDR_EL1) = (1UL << 31) | (vcpu->vcpu_id & 0xff);
 }
 
+/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go*/
+#define DBG_BCR_BVR_WCR_WVR_EL1(n)					\
+	/* DBGBVRn_EL1 */						\
+	{ Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b100),	\
+	  trap_debug_regs, reset_val, (DBGBCR0_EL1 + (n)), 0 },		\
+	/* DBGBCRn_EL1 */						\
+	{ Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b101),	\
+	  trap_debug_regs, reset_val, (DBGBVR0_EL1 + (n)), 0 },		\
+	/* DBGWVRn_EL1 */						\
+	{ Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b110),	\
+	  trap_debug_regs, reset_val, (DBGWCR0_EL1 + (n)), 0 },		\
+	/* DBGWCRn_EL1 */						\
+	{ Op0(0b10), Op1(0b000), CRn(0b0000), CRm((n)), Op2(0b111),	\
+	  trap_debug_regs, reset_val, (DBGWVR0_EL1 + (n)), 0 }
+
 /*
  * Architected system registers.
  * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
@@ -200,9 +268,6 @@ static void reset_mpidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
  * Therefore we tell the guest we have 0 counters.  Unfortunately, we
  * must always support PMCCNTR (the cycle counter): we just RAZ/WI for
  * all PM registers, which doesn't crash the guest kernel at least.
- *
- * Same goes for the whole debug infrastructure, which probably breaks
- * some guest functionnality. This should be fixed.
  */
 static const struct sys_reg_desc sys_reg_descs[] = {
 	/* DC ISW */
@@ -215,12 +280,71 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ Op0(0b01), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b010),
 	  access_dcsw },
 
+	DBG_BCR_BVR_WCR_WVR_EL1(0),
+	DBG_BCR_BVR_WCR_WVR_EL1(1),
+	/* MDCCINT_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b000),
+	  trap_debug_regs, reset_val, MDCCINT_EL1, 0 },
+	/* MDSCR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0000), CRm(0b0010), Op2(0b010),
+	  trap_debug_regs, reset_val, MDSCR_EL1, 0 },
+	DBG_BCR_BVR_WCR_WVR_EL1(2),
+	DBG_BCR_BVR_WCR_WVR_EL1(3),
+	DBG_BCR_BVR_WCR_WVR_EL1(4),
+	DBG_BCR_BVR_WCR_WVR_EL1(5),
+	DBG_BCR_BVR_WCR_WVR_EL1(6),
+	DBG_BCR_BVR_WCR_WVR_EL1(7),
+	DBG_BCR_BVR_WCR_WVR_EL1(8),
+	DBG_BCR_BVR_WCR_WVR_EL1(9),
+	DBG_BCR_BVR_WCR_WVR_EL1(10),
+	DBG_BCR_BVR_WCR_WVR_EL1(11),
+	DBG_BCR_BVR_WCR_WVR_EL1(12),
+	DBG_BCR_BVR_WCR_WVR_EL1(13),
+	DBG_BCR_BVR_WCR_WVR_EL1(14),
+	DBG_BCR_BVR_WCR_WVR_EL1(15),
+
+	/* MDRAR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b000),
+	  trap_wi_raz },
+	/* OSLAR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b100),
+	  trap_wi_raz },
+	/* OSLSR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0001), Op2(0b100),
+	  trap_oslsr_el1 },
+	/* OSDLR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0011), Op2(0b100),
+	  trap_wi_raz },
+	/* DBGPRCR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0001), CRm(0b0100), Op2(0b100),
+	  trap_wi_raz },
+	/* DBGCLAIMSET_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1000), Op2(0b110),
+	  trap_wi_raz },
+	/* DBGCLAIMCLR_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1001), Op2(0b110),
+	  trap_wi_raz },
+	/* DBGAUTHSTATUS_EL1 */
+	{ Op0(0b10), Op1(0b000), CRn(0b0111), CRm(0b1110), Op2(0b110),
+	  trap_dbgauthstatus_el1 },
+
 	/* TEECR32_EL1 */
 	{ Op0(0b10), Op1(0b010), CRn(0b0000), CRm(0b0000), Op2(0b000),
 	  NULL, reset_val, TEECR32_EL1, 0 },
 	/* TEEHBR32_EL1 */
 	{ Op0(0b10), Op1(0b010), CRn(0b0001), CRm(0b0000), Op2(0b000),
 	  NULL, reset_val, TEEHBR32_EL1, 0 },
+
+	/* MDCCSR_EL1 */
+	{ Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0001), Op2(0b000),
+	  trap_wi_raz },
+	/* DBGDTR_EL0 */
+	{ Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0100), Op2(0b000),
+	  trap_wi_raz },
+	/* DBGDTR[TR]X_EL0 */
+	{ Op0(0b10), Op1(0b011), CRn(0b0000), CRm(0b0101), Op2(0b000),
+	  trap_wi_raz },
+
 	/* DBGVCR32_EL2 */
 	{ Op0(0b10), Op1(0b100), CRn(0b0000), CRm(0b0111), Op2(0b000),
 	  NULL, reset_val, DBGVCR32_EL2, 0 },
-- 
1.8.3.4

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