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arm/arm64: KVM: add tracing support for arm64 exit handler

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arm64 uses its own copy of exit handler (arm64/kvm/handle_exit.c).
Currently this file doesn't hook up with any trace points. As a result
users might not see certain events (e.g. HVC & WFI) while using ftrace
with arm64 KVM. This patch fixes this issue by adding a new trace file
and defining two trace events (one of which is shared by wfi and wfe)
for arm64. The new trace points are then linked with related functions
in handle_exit.c.

Signed-off-by: Wei Huang <wei@redhat.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Wei Huang
2015-01-12 11:53:36 -05:00
committed by Christoffer Dall
parent 065c003482
commit 0d97f88481
4 changed files with 73 additions and 2 deletions
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13
arch/arm64/kvm/handle_exit.c
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@@ -26,12 +26,18 @@
#include <asm/kvm_mmu.h>
#include <asm/kvm_psci.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int ret;
trace_kvm_hvc_arm64(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
kvm_vcpu_hvc_get_imm(vcpu));
ret = kvm_psci_call(vcpu);
if (ret < 0) {
kvm_inject_undefined(vcpu);
@@ -61,10 +67,13 @@ static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
*/
static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE)
if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE) {
trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
kvm_vcpu_on_spin(vcpu);
else
} else {
trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
kvm_vcpu_block(vcpu);
}
kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));