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[S390] cleanup lowcore access from external interrupts

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Read external interrupts parameters from the lowcore in the first
level interrupt handler in entry[64].S.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2010-10-25 16:10:38 +02:00
committed by Martin Schwidefsky
parent 1e54622e04
commit f6649a7e5a
15 changed files with 57 additions and 49 deletions
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9
drivers/s390/kvm/kvm_virtio.c
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@@ -372,21 +372,22 @@ static void hotplug_devices(struct work_struct *dummy)
/*
* we emulate the request_irq behaviour on top of s390 extints
*/
static void kvm_extint_handler(u16 code)
static void kvm_extint_handler(unsigned int ext_int_code,
unsigned int param32, unsigned long param64)
{
struct virtqueue *vq;
u16 subcode;
u32 param;
subcode = S390_lowcore.cpu_addr;
subcode = ext_int_code >> 16;
if ((subcode & 0xff00) != VIRTIO_SUBCODE_64)
return;
/* The LSB might be overloaded, we have to mask it */
vq = (struct virtqueue *)(S390_lowcore.ext_params2 & ~1UL);
vq = (struct virtqueue *)(param64 & ~1UL);
/* We use ext_params to decide what this interrupt means */
param = S390_lowcore.ext_params & VIRTIO_PARAM_MASK;
param = param32 & VIRTIO_PARAM_MASK;
switch (param) {
case VIRTIO_PARAM_CONFIG_CHANGED: