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KVM: s390: deliver floating interrupts in order of priority

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This patch makes interrupt handling compliant to the z/Architecture
Principles of Operation with regard to interrupt priorities.

Add a bitmap for pending floating interrupts. Each bit relates to a
interrupt type and its list. A turned on bit indicates that a list
contains items (interrupts) which need to be delivered.  When delivering
interrupts on a cpu we can merge the existing bitmap for cpu-local
interrupts and floating interrupts and have a single mechanism for
delivery.
Currently we have one list for all kinds of floating interrupts and a
corresponding spin lock. This patch adds a separate list per
interrupt type. An exception to this are service signal and machine check
interrupts, as there can be only one pending interrupt at a time.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Jens Freimann
2013-07-03 15:18:35 +02:00
committed by Christian Borntraeger
parent 94aa033efc
commit 6d3da24141
5 changed files with 509 additions and 366 deletions
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30
arch/s390/include/asm/kvm_host.h
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@@ -344,6 +344,11 @@ enum irq_types {
IRQ_PEND_COUNT
};
/* We have 2M for virtio device descriptor pages. Smallest amount of
* memory per page is 24 bytes (1 queue), so (2048*1024) / 24 = 87381
*/
#define KVM_S390_MAX_VIRTIO_IRQS 87381
/*
* Repressible (non-floating) machine check interrupts
* subclass bits in MCIC
@@ -421,13 +426,32 @@ struct kvm_s390_local_interrupt {
unsigned long pending_irqs;
};
#define FIRQ_LIST_IO_ISC_0 0
#define FIRQ_LIST_IO_ISC_1 1
#define FIRQ_LIST_IO_ISC_2 2
#define FIRQ_LIST_IO_ISC_3 3
#define FIRQ_LIST_IO_ISC_4 4
#define FIRQ_LIST_IO_ISC_5 5
#define FIRQ_LIST_IO_ISC_6 6
#define FIRQ_LIST_IO_ISC_7 7
#define FIRQ_LIST_PFAULT 8
#define FIRQ_LIST_VIRTIO 9
#define FIRQ_LIST_COUNT 10
#define FIRQ_CNTR_IO 0
#define FIRQ_CNTR_SERVICE 1
#define FIRQ_CNTR_VIRTIO 2
#define FIRQ_CNTR_PFAULT 3
#define FIRQ_MAX_COUNT 4
struct kvm_s390_float_interrupt {
unsigned long pending_irqs;
spinlock_t lock;
struct list_head list;
atomic_t active;
struct list_head lists[FIRQ_LIST_COUNT];
int counters[FIRQ_MAX_COUNT];
struct kvm_s390_mchk_info mchk;
struct kvm_s390_ext_info srv_signal;
int next_rr_cpu;
unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
unsigned int irq_count;
};
struct kvm_hw_wp_info_arch {