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KVM: s390: add floating irq controller

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This patch adds a floating irq controller as a kvm_device.
It will be necessary for migration of floating interrupts as well
as for hardening the reset code by allowing user space to explicitly
remove all pending floating interrupts.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Jens Freimann
2013-10-07 16:13:45 +02:00
committed by Christian Borntraeger
parent 81aa8efe01
commit c05c4186bb
8 changed files with 317 additions and 56 deletions
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14
arch/s390/include/uapi/asm/kvm.h
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@@ -16,6 +16,20 @@
#define __KVM_S390
/* Device control API: s390-specific devices */
#define KVM_DEV_FLIC_GET_ALL_IRQS 1
#define KVM_DEV_FLIC_ENQUEUE 2
#define KVM_DEV_FLIC_CLEAR_IRQS 3
/*
* We can have up to 4*64k pending subchannels + 8 adapter interrupts,
* as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts.
* There are also sclp and machine checks. This gives us
* sizeof(kvm_s390_irq)*(4*65536+8+64*64+1+1) = 72 * 266250 = 19170000
* Lets round up to 8192 pages.
*/
#define KVM_S390_FLIC_MAX_BUFFER 0x2000000
/* for KVM_GET_REGS and KVM_SET_REGS */
struct kvm_regs {
/* general purpose regs for s390 */