From: Christian Borntraeger <[EMAIL PROTECTED]>
This patch changes the interrupt defintions for virtio on s390. We now use
the extint number 0x2603, which is used as a host interrupt already by z/VM
for pfault and dasd_diag.
We will use subcode 0x0D to distinguish virtio from dasd and pfault.
Signed-off-by: Christian Borntraeger <[EMAIL PROTECTED]>
Signed-off-by: Carsten Otte <[EMAIL PROTECTED]>
---
arch/s390/kvm/interrupt.c | 6 +++++-
drivers/s390/kvm/kvm_virtio.c | 8 +++++++-
2 files changed, 12 insertions(+), 2 deletions(-)
Index: kvm/arch/s390/kvm/interrupt.c
===================================================================
--- kvm.orig/arch/s390/kvm/interrupt.c
+++ kvm/arch/s390/kvm/interrupt.c
@@ -162,7 +162,11 @@ static void __do_deliver_interrupt(struc
VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%lx",
inti->ext.ext_params, inti->ext.ext_params2);
vcpu->stat.deliver_virtio_interrupt++;
- rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1237);
+ rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
+ if (rc == -EFAULT)
+ exception = 1;
+
+ rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00);
if (rc == -EFAULT)
exception = 1;
Index: kvm/drivers/s390/kvm/kvm_virtio.c
===================================================================
--- kvm.orig/drivers/s390/kvm/kvm_virtio.c
+++ kvm/drivers/s390/kvm/kvm_virtio.c
@@ -23,6 +23,8 @@
#include <asm/setup.h>
#include <asm/s390_ext.h>
+#define VIRTIO_SUBCODE_64 0x0D00
+
/*
* The pointer to our (page) of device descriptions.
*/
@@ -291,6 +293,10 @@ static void scan_devices(void)
static void kvm_extint_handler(u16 code)
{
void *data = (void *) *(long *) __LC_PFAULT_INTPARM;
+ u16 subcode = S390_lowcore.cpu_addr;
+
+ if ((subcode & 0xff00) != VIRTIO_SUBCODE_64)
+ return;
vring_interrupt(0, data);
}
@@ -319,8 +325,8 @@ static int __init kvm_devices_init(void)
kvm_devices = (void *) (max_pfn << PAGE_SHIFT);
- register_external_interrupt(0x1237, kvm_extint_handler);
ctl_set_bit(0, 9);
+ register_external_interrupt(0x2603, kvm_extint_handler);
scan_devices();
return 0;
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