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KVM: S390: take a full byte as ext_param indicator

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Currenty the ext_param field only distinguishes between "config change" and
"vring interrupt". We can do a lot more with it though, so let's enable a
full byte of possible values and constants to #defines while at it.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Alexander Graf 2010-08-24 15:48:50 +02:00 committed by Avi Kivity
parent 189be38db3
commit fc678d67fe
2 changed files with 19 additions and 6 deletions
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6
arch/s390/include/asm/kvm_virtio.h
View File

@ -54,4 +54,10 @@ struct kvm_vqconfig {
* This is pagesize for historical reasons. */
#define KVM_S390_VIRTIO_RING_ALIGN 4096
/* These values are supposed to be in ext_params on an interrupt */
#define VIRTIO_PARAM_MASK 0xff
#define VIRTIO_PARAM_VRING_INTERRUPT 0x0
#define VIRTIO_PARAM_CONFIG_CHANGED 0x1
#endif

19
drivers/s390/kvm/kvm_virtio.c
View File

@ -334,7 +334,7 @@ static void kvm_extint_handler(u16 code)
{
struct virtqueue *vq;
u16 subcode;
int config_changed;
u32 param;
subcode = S390_lowcore.cpu_addr;
if ((subcode & 0xff00) != VIRTIO_SUBCODE_64)
@ -343,18 +343,25 @@ static void kvm_extint_handler(u16 code)
/* The LSB might be overloaded, we have to mask it */
vq = (struct virtqueue *)(S390_lowcore.ext_params2 & ~1UL);
/* We use the LSB of extparam, to decide, if this interrupt is a config
* change or a "standard" interrupt */
config_changed = S390_lowcore.ext_params & 1;
/* We use ext_params to decide what this interrupt means */
param = S390_lowcore.ext_params & VIRTIO_PARAM_MASK;
if (config_changed) {
switch (param) {
case VIRTIO_PARAM_CONFIG_CHANGED:
{
struct virtio_driver *drv;
drv = container_of(vq->vdev->dev.driver,
struct virtio_driver, driver);
if (drv->config_changed)
drv->config_changed(vq->vdev);
} else
break;
}
case VIRTIO_PARAM_VRING_INTERRUPT:
default:
vring_interrupt(0, vq);
break;
}
}
/*