Commit 3a95fc61 authored by wanghaibin's avatar wanghaibin Committed by Dongxu Sun
Browse files

KVM: arm64: sdev: Support virq bypass by INT/VSYNC command 

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8UROS


CVE: NA

--------------------------------

We already have the set_irqchip_state() callback which will issue
INT/VSYNC commands on the physical side when the handled IRQ is
forwarded to vcpu.  It was intended to be used to handle the guest
INT command targeting a VLPI.

Let's reuse this hack to set the virtio-pci function's VLPI pending,
instead of directly writing message data into GITS_TRANSLATER, which
should only be treated as the Message Address of PCI devices.

Signed-off-by: default avatarwanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarKunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: default avatarDongxu Sun <sundongxu3@huawei.com>
parent e25e2fd4

arch/arm64/kvm/vgic/vgic-irqfd.c

+21 −0
Original line number Diff line number Diff line
@@ -121,6 +121,23 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, 
	return vgic_its_inject_msi(kvm, &msi);

}



#ifdef CONFIG_VIRT_PLAT_DEV

static int kvm_arch_set_irq_bypass(struct kvm_kernel_irq_routing_entry *e,

				  struct kvm *kvm)

{

	struct kire_data *cache = &e->cache;



	/*

	 * FIXME: is there any race against the irqfd_update(),

	 * where the cache data will be updated?

	 */

	if (!cache->valid)

		return -EWOULDBLOCK;



	return shadow_dev_virq_bypass_inject(kvm, e);

}

#endif



/**

 * kvm_arch_set_irq_inatomic: fast-path for irqfd injection

 */
@@ -138,6 +155,10 @@ int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e, 
		if (!vgic_has_its(kvm))

			break;



#ifdef CONFIG_VIRT_PLAT_DEV

		if (!kvm_arch_set_irq_bypass(e, kvm))

			return 0;

#endif

		kvm_populate_msi(e, &msi);

		return vgic_its_inject_cached_translation(kvm, &msi);

	}

include/kvm/arm_vgic.h

+3 −0
Original line number Diff line number Diff line
@@ -466,6 +466,9 @@ int kvm_shadow_dev_create(struct kvm *kvm, struct kvm_master_dev_info *mdi); 
void kvm_shadow_dev_delete(struct kvm *kvm, u32 devid);

void kvm_shadow_dev_delete_all(struct kvm *kvm);

struct shadow_dev *kvm_shadow_dev_get(struct kvm *kvm, struct kvm_msi *msi);



int shadow_dev_virq_bypass_inject(struct kvm *kvm,

				  struct kvm_kernel_irq_routing_entry *e);

#endif



#endif /* __KVM_ARM_VGIC_H */