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KVM: arm/arm64: Fixup the kvm_exit tracepoint 

The kvm_exit tracepoint strangely always reported exits as being IRQs.
This seems to be because either the __print_symbolic or the tracepoint
macros use a variable named idx.

Take this chance to update the fields in the tracepoint to reflect the
concepts in the arm64 architecture that we pass to the tracepoint and
move the exception type table to the same location and header files as
the exits code.

We also clear out the exception code to 0 for IRQ exits (which
translates to UNKNOWN in text) to make it slighyly less confusing to
parse the trace output.

Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall 2018-12-03 21:31:24 +01:00 committed by Marc Zyngier
parent 9009782a49
commit 71a7e47f39
3 changed files with 15 additions and 13 deletions
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4
arch/arm64/include/asm/kvm_arm.h
View File

@ -320,10 +320,6 @@
#define PAR_TO_HPFAR(par) \
(((par) & GENMASK_ULL(PHYS_MASK_SHIFT - 1, 12)) >> 8)
#define kvm_arm_exception_type \
{0, "IRQ" }, \
{1, "TRAP" }
#define ECN(x) { ESR_ELx_EC_##x, #x }
#define kvm_arm_exception_class \

6
arch/arm64/include/asm/kvm_asm.h
View File

@ -34,6 +34,12 @@
/* The hyp-stub will return this for any kvm_call_hyp() call */
#define ARM_EXCEPTION_HYP_GONE HVC_STUB_ERR
#define kvm_arm_exception_type \
{ARM_EXCEPTION_IRQ, "IRQ" }, \
{ARM_EXCEPTION_EL1_SERROR, "SERROR" }, \
{ARM_EXCEPTION_TRAP, "TRAP" }, \
{ARM_EXCEPTION_HYP_GONE, "HYP_GONE" }
#ifndef __ASSEMBLY__
#include <linux/mm.h>

18
virt/kvm/arm/trace.h
View File

@ -26,25 +26,25 @@ TRACE_EVENT(kvm_entry,
);
TRACE_EVENT(kvm_exit,
TP_PROTO(int idx, unsigned int exit_reason, unsigned long vcpu_pc),
TP_ARGS(idx, exit_reason, vcpu_pc),
TP_PROTO(int ret, unsigned int esr_ec, unsigned long vcpu_pc),
TP_ARGS(ret, esr_ec, vcpu_pc),
TP_STRUCT__entry(
__field( int, idx )
__field( unsigned int, exit_reason )
__field( int, ret )
__field( unsigned int, esr_ec )
__field( unsigned long, vcpu_pc )
),
TP_fast_assign(
__entry->idx = idx;
__entry->exit_reason = exit_reason;
__entry->ret = ARM_EXCEPTION_CODE(ret);
__entry->esr_ec = (ARM_EXCEPTION_CODE(ret) == ARM_EXCEPTION_TRAP) ? esr_ec : 0;
__entry->vcpu_pc = vcpu_pc;
),
TP_printk("%s: HSR_EC: 0x%04x (%s), PC: 0x%08lx",
__print_symbolic(__entry->idx, kvm_arm_exception_type),
__entry->exit_reason,
__print_symbolic(__entry->exit_reason, kvm_arm_exception_class),
__print_symbolic(__entry->ret, kvm_arm_exception_type),
__entry->esr_ec,
__print_symbolic(__entry->esr_ec, kvm_arm_exception_class),
__entry->vcpu_pc)
);