This includes trace points for: kvm_arch_setup_guest_debug kvm_arch_clear_guest_debug kvm_handle_guest_debug
I've also added some generic register setting trace events and also a trace point to dump the array of hardware registers. Signed-off-by: Alex Bennée <[email protected]> --- v3 - add trace event for debug access. - remove short trace #define, rename trace events - use __print_array with fixed array instead of own func - rationalise trace points (only one per register changed) - add vcpu ptr to the debug_setup trace - remove :: in prints diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index dc8bca8..08e1b83 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -24,6 +24,8 @@ #include <asm/kvm_arm.h> #include <asm/kvm_emulate.h> +#include "trace.h" + /* These are the bits of MDSCR_EL1 we may manipulate */ #define MDSCR_EL1_DEBUG_MASK (DBG_MDSCR_SS | \ DBG_MDSCR_KDE | \ @@ -44,6 +46,11 @@ static void save_guest_debug_regs(struct kvm_vcpu *vcpu) { vcpu->arch.guest_debug_state.pstate = *vcpu_cpsr(vcpu); vcpu->arch.guest_debug_state.mdscr_el1 = vcpu_sys_reg(vcpu, MDSCR_EL1); + + trace_kvm_arm_set_dreg32("Saved PSTATE", + vcpu->arch.guest_debug_state.pstate); + trace_kvm_arm_set_dreg32("Saved MDSCR_EL1", + vcpu->arch.guest_debug_state.mdscr_el1); } static void restore_guest_debug_regs(struct kvm_vcpu *vcpu) @@ -51,6 +58,10 @@ static void restore_guest_debug_regs(struct kvm_vcpu *vcpu) *vcpu_cpsr(vcpu) |= (vcpu->arch.guest_debug_state.pstate & SPSR_DEBUG_MASK); vcpu_sys_reg(vcpu, MDSCR_EL1) = vcpu->arch.guest_debug_state.mdscr_el1; + + trace_kvm_arm_set_dreg32("Restored PSTATE", *vcpu_cpsr(vcpu)); + trace_kvm_arm_set_dreg32("Restored MDSCR_EL1", + vcpu_sys_reg(vcpu, MDSCR_EL1)); } /** @@ -92,6 +103,8 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) { bool trap_debug = !(vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY); + trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug); + vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK; vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM | MDCR_EL2_TPMCR | @@ -121,6 +134,8 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu_sys_reg(vcpu, MDSCR_EL1) &= ~DBG_MDSCR_SS; } + trace_kvm_arm_set_dreg32("SPSR_EL2", *vcpu_cpsr(vcpu)); + /* * HW Break/Watch points * @@ -138,6 +153,14 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu->arch.debug_ptr = &vcpu->arch.external_debug_state; vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY; trap_debug = true; + + trace_kvm_arm_set_regset("BKPTS", get_num_brps(), + &vcpu->arch.debug_ptr->dbg_bcr[0], + &vcpu->arch.debug_ptr->dbg_bvr[0]); + + trace_kvm_arm_set_regset("WAPTS", get_num_wrps(), + &vcpu->arch.debug_ptr->dbg_wcr[0], + &vcpu->arch.debug_ptr->dbg_wvr[0]); } } else { @@ -155,10 +178,15 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA; else vcpu->arch.mdcr_el2 &= ~MDCR_EL2_TDA; + + trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2); + trace_kvm_arm_set_dreg32("MDSCR_EL1", vcpu_sys_reg(vcpu, MDSCR_EL1)); } void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) { + trace_kvm_arm_clear_debug(vcpu->guest_debug); + if (vcpu->guest_debug) { restore_guest_debug_regs(vcpu); @@ -169,6 +197,14 @@ void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { vcpu->arch.debug_ptr = (struct kvm_guest_debug_arch *) &vcpu_sys_reg(vcpu, DBGBCR0_EL1); + + trace_kvm_arm_set_regset("BKPTS", get_num_brps(), + &vcpu->arch.debug_ptr->dbg_bcr[0], + &vcpu->arch.debug_ptr->dbg_bvr[0]); + + trace_kvm_arm_set_regset("WAPTS", get_num_wrps(), + &vcpu->arch.debug_ptr->dbg_wcr[0], + &vcpu->arch.debug_ptr->dbg_wvr[0]); } } } diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 68a0759..c93b95e 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -99,6 +99,8 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run) u32 hsr = kvm_vcpu_get_hsr(vcpu); int ret = 0; + trace_kvm_handle_guest_debug(*vcpu_pc(vcpu), hsr); + run->exit_reason = KVM_EXIT_DEBUG; run->debug.arch.hsr = hsr; diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 95f422f..ec803ad 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -38,6 +38,8 @@ #include "sys_regs.h" +#include "trace.h" + /* * All of this file is extremly similar to the ARM coproc.c, but the * types are different. My gut feeling is that it should be pretty @@ -227,6 +229,9 @@ static bool trap_debug_regs(struct kvm_vcpu *vcpu, const struct sys_reg_params *p, const struct sys_reg_desc *r) { + trace_trap_debug_regs(r->reg, p->is_write, + p->is_write?*vcpu_reg(vcpu, p->Rt):0); + if (vcpu->guest_debug && shadow_debug_reg(vcpu, p, r)) return true; diff --git a/arch/arm64/kvm/trace.h b/arch/arm64/kvm/trace.h index 157416e9..62e6b76 100644 --- a/arch/arm64/kvm/trace.h +++ b/arch/arm64/kvm/trace.h @@ -44,6 +44,113 @@ TRACE_EVENT(kvm_hvc_arm64, __entry->vcpu_pc, __entry->r0, __entry->imm) ); +TRACE_EVENT(kvm_handle_guest_debug, + TP_PROTO(unsigned long vcpu_pc, u32 hsr), + TP_ARGS(vcpu_pc, hsr), + + TP_STRUCT__entry( + __field(unsigned long, vcpu_pc) + __field(u32, hsr) + ), + + TP_fast_assign( + __entry->vcpu_pc = vcpu_pc; + __entry->hsr = hsr; + ), + + TP_printk("debug exception at 0x%08lx (HSR: 0x%08x)", + __entry->vcpu_pc, __entry->hsr) +); + + +TRACE_EVENT(kvm_arm_setup_debug, + TP_PROTO(struct kvm_vcpu *vcpu, __u32 guest_debug), + TP_ARGS(vcpu, guest_debug), + + TP_STRUCT__entry( + __field(struct kvm_vcpu *, vcpu) + __field(__u32, guest_debug) + ), + + TP_fast_assign( + __entry->vcpu = vcpu; + __entry->guest_debug = guest_debug; + ), + + TP_printk("vcpu: %p, flags: 0x%08x", __entry->vcpu, __entry->guest_debug) +); + +TRACE_EVENT(kvm_arm_clear_debug, + TP_PROTO(__u32 guest_debug), + TP_ARGS(guest_debug), + + TP_STRUCT__entry( + __field(__u32, guest_debug) + ), + + TP_fast_assign( + __entry->guest_debug = guest_debug; + ), + + TP_printk("flags: 0x%08x", __entry->guest_debug) +); + +TRACE_EVENT(kvm_arm_set_dreg32, + TP_PROTO(const char *name, __u32 value), + TP_ARGS(name, value), + + TP_STRUCT__entry( + __field(const char *, name) + __field(__u32, value) + ), + + TP_fast_assign( + __entry->name = name; + __entry->value = value; + ), + + TP_printk("%s: 0x%08x", __entry->name, __entry->value) +); + +TRACE_EVENT(kvm_arm_set_regset, + TP_PROTO(const char *type, int len, __u64 *control, __u64 *value), + TP_ARGS(type, len, control, value), + TP_STRUCT__entry( + __field(const char *, name) + __field(int, len) + __array(u64, ctrls, 16) + __array(u64, values, 16) + ), + TP_fast_assign( + __entry->name = type; + __entry->len = len; + memcpy(__entry->ctrls, control, len << 3); + memcpy(__entry->values, value, len << 3); + ), + TP_printk("%d %s CTRL:%s VALUE:%s", __entry->len, __entry->name, + __print_array(__entry->ctrls, __entry->len, sizeof(__u64)), + __print_array(__entry->values, __entry->len, sizeof(__u64))) +); + +TRACE_EVENT(trap_debug_regs, + TP_PROTO(int reg, bool is_write, u64 write_value), + TP_ARGS(reg, is_write, write_value), + + TP_STRUCT__entry( + __field(int, reg) + __field(bool, is_write) + __field(u64, write_value) + ), + + TP_fast_assign( + __entry->reg = reg; + __entry->is_write = is_write; + __entry->write_value = write_value; + ), + + TP_printk("%s reg %d (0x%08llx)", __entry->is_write?"write to":"read from", __entry->reg, __entry->write_value) +); + #endif /* _TRACE_ARM64_KVM_H */ #undef TRACE_INCLUDE_PATH -- 2.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
