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authorChristoffer Dall <christoffer.dall@linaro.org>2013-10-15 18:10:42 -0700
committerChristoffer Dall <christoffer.dall@linaro.org>2013-10-17 15:26:50 -0700
commit86ed81aa2e1ce05a4e7f0819f0dfc34e8d8fb910 (patch)
treee004311de4c4c4075e91ca317a19983e2a612209 /arch/arm/kvm
parent58d5ec8f8ee318b26b29207874fbaee626973952 (diff)
KVM: ARM: Update comments for kvm_handle_wfi
Update comments to reflect what is really going on and add the TWE bit to the comments in kvm_arm.h. Also renames the function to kvm_handle_wfx like is done on arm64 for consistency and uber-correctness. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm')
-rw-r--r--arch/arm/kvm/handle_exit.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/arch/arm/kvm/handle_exit.c b/arch/arm/kvm/handle_exit.c
index c4c496f7619..a92079011a8 100644
--- a/arch/arm/kvm/handle_exit.c
+++ b/arch/arm/kvm/handle_exit.c
@@ -73,15 +73,17 @@ static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
}
/**
- * kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest
+ * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
* @vcpu: the vcpu pointer
* @run: the kvm_run structure pointer
*
- * Simply sets the wait_for_interrupts flag on the vcpu structure, which will
- * halt execution of world-switches and schedule other host processes until
- * there is an incoming IRQ or FIQ to the VM.
+ * WFE: Yield the CPU and come back to this vcpu when the scheduler
+ * decides to.
+ * WFI: Simply call kvm_vcpu_block(), which will halt execution of
+ * world-switches and schedule other host processes until there is an
+ * incoming IRQ or FIQ to the VM.
*/
-static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
+static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
trace_kvm_wfi(*vcpu_pc(vcpu));
if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
@@ -93,7 +95,7 @@ static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
}
static exit_handle_fn arm_exit_handlers[] = {
- [HSR_EC_WFI] = kvm_handle_wfi,
+ [HSR_EC_WFI] = kvm_handle_wfx,
[HSR_EC_CP15_32] = kvm_handle_cp15_32,
[HSR_EC_CP15_64] = kvm_handle_cp15_64,
[HSR_EC_CP14_MR] = kvm_handle_cp14_access,