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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>
hifive-unleashed-5.1
Christoffer Dall 2013-10-15 18:10:42 -07:00
parent 58d5ec8f8e
commit 86ed81aa2e
2 changed files with 9 additions and 6 deletions
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1
arch/arm/include/asm/kvm_arm.h
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@ -57,6 +57,7 @@
* TSC: Trap SMC
* TSW: Trap cache operations by set/way
* TWI: Trap WFI
* TWE: Trap WFE
* TIDCP: Trap L2CTLR/L2ECTLR
* BSU_IS: Upgrade barriers to the inner shareable domain
* FB: Force broadcast of all maintainance operations

14
arch/arm/kvm/handle_exit.c
View File

@ -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,