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arm64: KVM: Yield CPU when vcpu executes a WFE 

On an (even slightly) oversubscribed system, spinlocks are quickly
becoming a bottleneck, as some vcpus are spinning, waiting for a
lock to be released, while the vcpu holding the lock may not be
running at all.

The solution is to trap blocking WFEs and tell KVM that we're
now spinning. This ensures that other vpus will get a scheduling
boost, allowing the lock to be released more quickly. Also, using
CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT slightly improves the performance
when the VM is severely overcommited.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2013-08-02 11:41:13 +01:00
parent 4a10c2ac2f
commit d241aac798
3 changed files with 20 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/include/asm/kvm_arm.h
View File

@ -63,6 +63,7 @@
* TAC: Trap ACTLR
* TSC: Trap SMC
* TSW: Trap cache operations by set/way
* TWE: Trap WFE
* TWI: Trap WFI
* TIDCP: Trap L2CTLR/L2ECTLR
* BSU_IS: Upgrade barriers to the inner shareable domain
@ -72,8 +73,9 @@
* FMO: Override CPSR.F and enable signaling with VF
* SWIO: Turn set/way invalidates into set/way clean+invalidate
*/
#define HCR_GUEST_FLAGS (HCR_TSC | HCR_TSW | HCR_TWI | HCR_VM | HCR_BSU_IS | \
HCR_FB | HCR_TAC | HCR_AMO | HCR_IMO | HCR_FMO | \
#define HCR_GUEST_FLAGS (HCR_TSC | HCR_TSW | HCR_TWE | HCR_TWI | HCR_VM | \
HCR_BSU_IS | HCR_FB | HCR_TAC | \
HCR_AMO | HCR_IMO | HCR_FMO | \
HCR_SWIO | HCR_TIDCP | HCR_RW)
#define HCR_VIRT_EXCP_MASK (HCR_VA | HCR_VI | HCR_VF)
@ -242,4 +244,6 @@
#define ESR_EL2_EC_xABT_xFSR_EXTABT 0x10
#define ESR_EL2_EC_WFI_ISS_WFE (1 << 0)
#endif /* __ARM64_KVM_ARM_H__ */

1
arch/arm64/kvm/Kconfig
View File

@ -21,6 +21,7 @@ config KVM
select MMU_NOTIFIER
select PREEMPT_NOTIFIERS
select ANON_INODES
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_MMIO
select KVM_ARM_HOST
select KVM_ARM_VGIC

18
arch/arm64/kvm/handle_exit.c
View File

@ -47,21 +47,29 @@ static int handle_smc(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 wait-for-interrupts or wait-for-event
* instruction executed by a guest
*
* @vcpu: the vcpu pointer
*
* Simply call kvm_vcpu_block(), which will halt execution of
* 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)
{
kvm_vcpu_block(vcpu);
if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE)
kvm_vcpu_on_spin(vcpu);
else
kvm_vcpu_block(vcpu);
return 1;
}
static exit_handle_fn arm_exit_handlers[] = {
[ESR_EL2_EC_WFI] = kvm_handle_wfi,
[ESR_EL2_EC_WFI] = kvm_handle_wfx,
[ESR_EL2_EC_CP15_32] = kvm_handle_cp15_32,
[ESR_EL2_EC_CP15_64] = kvm_handle_cp15_64,
[ESR_EL2_EC_CP14_MR] = kvm_handle_cp14_access,