[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 01/10] xen/arm: no need to set HCR_VI when using the vgic to inject irqs
HCR_VI forces the guest to resume execution in IRQ mode and can actually cause spurious interrupt injections. The GIC is capable of injecting interrupts into the guest and causing it to switch to IRQ mode automatically, without any need for the hypervisor to set HCR_VI manually. See ARM ARM B1.8.11 and chapter 5.4 of the Generic Interrupt Controller Architecture Specification. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> Acked-by: Julien Grall <julien.grall@xxxxxxxxxx> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx> --- Changes in v4: - improve commit message. --- xen/arch/arm/gic.c | 20 -------------------- 1 file changed, 20 deletions(-) diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c index 91a2982..b388ef3 100644 --- a/xen/arch/arm/gic.c +++ b/xen/arch/arm/gic.c @@ -726,22 +726,6 @@ void gic_clear_pending_irqs(struct vcpu *v) spin_unlock_irqrestore(&gic.lock, flags); } -static void gic_inject_irq_start(void) -{ - register_t hcr = READ_SYSREG(HCR_EL2); - WRITE_SYSREG(hcr | HCR_VI, HCR_EL2); - isb(); -} - -static void gic_inject_irq_stop(void) -{ - register_t hcr = READ_SYSREG(HCR_EL2); - if (hcr & HCR_VI) { - WRITE_SYSREG(hcr & ~HCR_VI, HCR_EL2); - isb(); - } -} - int gic_events_need_delivery(void) { return (!list_empty(¤t->arch.vgic.lr_pending) || @@ -754,10 +738,6 @@ void gic_inject(void) vgic_vcpu_inject_irq(current, current->domain->arch.evtchn_irq, 1); gic_restore_pending_irqs(current); - if (!gic_events_need_delivery()) - gic_inject_irq_stop(); - else - gic_inject_irq_start(); } int gic_route_irq_to_guest(struct domain *d, const struct dt_irq *irq, -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |