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KVM: s390: deliver floating interrupts in order of priority
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>
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94aa033efc
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6d3da24141
arch/s390
@ -344,6 +344,11 @@ enum irq_types {
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IRQ_PEND_COUNT
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};
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/* We have 2M for virtio device descriptor pages. Smallest amount of
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* memory per page is 24 bytes (1 queue), so (2048*1024) / 24 = 87381
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*/
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#define KVM_S390_MAX_VIRTIO_IRQS 87381
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/*
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* Repressible (non-floating) machine check interrupts
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* subclass bits in MCIC
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@ -421,13 +426,32 @@ struct kvm_s390_local_interrupt {
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unsigned long pending_irqs;
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};
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#define FIRQ_LIST_IO_ISC_0 0
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#define FIRQ_LIST_IO_ISC_1 1
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#define FIRQ_LIST_IO_ISC_2 2
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#define FIRQ_LIST_IO_ISC_3 3
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#define FIRQ_LIST_IO_ISC_4 4
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#define FIRQ_LIST_IO_ISC_5 5
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#define FIRQ_LIST_IO_ISC_6 6
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#define FIRQ_LIST_IO_ISC_7 7
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#define FIRQ_LIST_PFAULT 8
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#define FIRQ_LIST_VIRTIO 9
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#define FIRQ_LIST_COUNT 10
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#define FIRQ_CNTR_IO 0
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#define FIRQ_CNTR_SERVICE 1
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#define FIRQ_CNTR_VIRTIO 2
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#define FIRQ_CNTR_PFAULT 3
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#define FIRQ_MAX_COUNT 4
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struct kvm_s390_float_interrupt {
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unsigned long pending_irqs;
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spinlock_t lock;
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struct list_head list;
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atomic_t active;
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struct list_head lists[FIRQ_LIST_COUNT];
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int counters[FIRQ_MAX_COUNT];
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struct kvm_s390_mchk_info mchk;
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struct kvm_s390_ext_info srv_signal;
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int next_rr_cpu;
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unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
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unsigned int irq_count;
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};
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struct kvm_hw_wp_info_arch {
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File diff suppressed because it is too large
Load Diff
@ -31,6 +31,7 @@
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#include <asm/pgtable.h>
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#include <asm/nmi.h>
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#include <asm/switch_to.h>
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#include <asm/isc.h>
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#include <asm/sclp.h>
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#include "kvm-s390.h"
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#include "gaccess.h"
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@ -1069,7 +1070,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
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goto out_err;
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spin_lock_init(&kvm->arch.float_int.lock);
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INIT_LIST_HEAD(&kvm->arch.float_int.list);
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for (i = 0; i < FIRQ_LIST_COUNT; i++)
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INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
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init_waitqueue_head(&kvm->arch.ipte_wq);
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mutex_init(&kvm->arch.ipte_mutex);
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@ -178,7 +178,7 @@ int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
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struct kvm_s390_irq *irq);
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int __must_check kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code);
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struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
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u64 cr6, u64 schid);
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u64 isc_mask, u32 schid);
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int kvm_s390_reinject_io_int(struct kvm *kvm,
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struct kvm_s390_interrupt_info *inti);
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int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);
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@ -294,10 +294,13 @@ reinject_interrupt:
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static int handle_tsch(struct kvm_vcpu *vcpu)
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{
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struct kvm_s390_interrupt_info *inti;
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struct kvm_s390_interrupt_info *inti = NULL;
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const u64 isc_mask = 0xffUL << 24; /* all iscs set */
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inti = kvm_s390_get_io_int(vcpu->kvm, 0,
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vcpu->run->s.regs.gprs[1]);
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/* a valid schid has at least one bit set */
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if (vcpu->run->s.regs.gprs[1])
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inti = kvm_s390_get_io_int(vcpu->kvm, isc_mask,
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vcpu->run->s.regs.gprs[1]);
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/*
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* Prepare exit to userspace.
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