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author | Cornelia Huck <cornelia.huck@de.ibm.com> | 2013-07-15 13:36:01 +0200 |
---|---|---|
committer | Cornelia Huck <cornelia.huck@de.ibm.com> | 2014-03-21 13:43:00 +0100 |
commit | 84223598778ba08041f4297fda485df83414d57e (patch) | |
tree | bd93b83a13cc5cd1f6781bf681161fb3982548c5 /arch | |
parent | 841b91c584b6d1e2a2cb508bd2d0236cd37e1750 (diff) | |
download | linux-stable-84223598778ba08041f4297fda485df83414d57e.tar.gz linux-stable-84223598778ba08041f4297fda485df83414d57e.tar.bz2 linux-stable-84223598778ba08041f4297fda485df83414d57e.zip |
KVM: s390: irq routing for adapter interrupts.
Introduce a new interrupt class for s390 adapter interrupts and enable
irqfds for s390.
This is depending on a new s390 specific vm capability, KVM_CAP_S390_IRQCHIP,
that needs to be enabled by userspace.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/s390/include/asm/kvm_host.h | 9 | ||||
-rw-r--r-- | arch/s390/kvm/Kconfig | 2 | ||||
-rw-r--r-- | arch/s390/kvm/Makefile | 2 | ||||
-rw-r--r-- | arch/s390/kvm/interrupt.c | 121 | ||||
-rw-r--r-- | arch/s390/kvm/irq.h | 22 | ||||
-rw-r--r-- | arch/s390/kvm/kvm-s390.c | 17 |
6 files changed, 172 insertions, 1 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 0d5235262707..dd3933754d23 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -24,6 +24,14 @@ #define KVM_MAX_VCPUS 64 #define KVM_USER_MEM_SLOTS 32 +/* + * These seem to be used for allocating ->chip in the routing table, + * which we don't use. 4096 is an out-of-thin-air value. If we need + * to look at ->chip later on, we'll need to revisit this. + */ +#define KVM_NR_IRQCHIPS 1 +#define KVM_IRQCHIP_NUM_PINS 4096 + struct sca_entry { atomic_t scn; __u32 reserved; @@ -274,6 +282,7 @@ struct kvm_arch{ struct kvm_device *flic; struct gmap *gmap; int css_support; + int use_irqchip; struct s390_io_adapter *adapters[MAX_S390_IO_ADAPTERS]; }; diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index c8bacbcd2e5b..10d529ac9821 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig @@ -25,6 +25,8 @@ config KVM select HAVE_KVM_EVENTFD select KVM_ASYNC_PF select KVM_ASYNC_PF_SYNC + select HAVE_KVM_IRQCHIP + select HAVE_KVM_IRQ_ROUTING ---help--- Support hosting paravirtualized guest machines using the SIE virtualization capability on the mainframe. This should work diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile index a47d2c355f68..d3adb37e93a4 100644 --- a/arch/s390/kvm/Makefile +++ b/arch/s390/kvm/Makefile @@ -7,7 +7,7 @@ # as published by the Free Software Foundation. KVM := ../../../virt/kvm -common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/async_pf.o +common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/async_pf.o $(KVM)/irqchip.o ccflags-y := -Ivirt/kvm -Iarch/s390/kvm diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 7ecef5a18e25..2e2814eceb85 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -13,6 +13,7 @@ #include <linux/interrupt.h> #include <linux/kvm_host.h> #include <linux/hrtimer.h> +#include <linux/mmu_context.h> #include <linux/signal.h> #include <linux/slab.h> #include <asm/asm-offsets.h> @@ -1284,3 +1285,123 @@ struct kvm_device_ops kvm_flic_ops = { .create = flic_create, .destroy = flic_destroy, }; + +static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap) +{ + unsigned long bit; + + bit = bit_nr + (addr % PAGE_SIZE) * 8; + + return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit; +} + +static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter, + u64 addr) +{ + struct s390_map_info *map; + + if (!adapter) + return NULL; + + list_for_each_entry(map, &adapter->maps, list) { + if (map->guest_addr == addr) + return map; + } + return NULL; +} + +static int adapter_indicators_set(struct kvm *kvm, + struct s390_io_adapter *adapter, + struct kvm_s390_adapter_int *adapter_int) +{ + unsigned long bit; + int summary_set, idx; + struct s390_map_info *info; + void *map; + + info = get_map_info(adapter, adapter_int->ind_addr); + if (!info) + return -1; + map = page_address(info->page); + bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap); + set_bit(bit, map); + idx = srcu_read_lock(&kvm->srcu); + mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); + set_page_dirty_lock(info->page); + info = get_map_info(adapter, adapter_int->summary_addr); + if (!info) { + srcu_read_unlock(&kvm->srcu, idx); + return -1; + } + map = page_address(info->page); + bit = get_ind_bit(info->addr, adapter_int->summary_offset, + adapter->swap); + summary_set = test_and_set_bit(bit, map); + mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT); + set_page_dirty_lock(info->page); + srcu_read_unlock(&kvm->srcu, idx); + return summary_set ? 0 : 1; +} + +/* + * < 0 - not injected due to error + * = 0 - coalesced, summary indicator already active + * > 0 - injected interrupt + */ +static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int irq_source_id, int level, + bool line_status) +{ + int ret; + struct s390_io_adapter *adapter; + + /* We're only interested in the 0->1 transition. */ + if (!level) + return 0; + adapter = get_io_adapter(kvm, e->adapter.adapter_id); + if (!adapter) + return -1; + down_read(&adapter->maps_lock); + ret = adapter_indicators_set(kvm, adapter, &e->adapter); + up_read(&adapter->maps_lock); + if ((ret > 0) && !adapter->masked) { + struct kvm_s390_interrupt s390int = { + .type = KVM_S390_INT_IO(1, 0, 0, 0), + .parm = 0, + .parm64 = (adapter->isc << 27) | 0x80000000, + }; + ret = kvm_s390_inject_vm(kvm, &s390int); + if (ret == 0) + ret = 1; + } + return ret; +} + +int kvm_set_routing_entry(struct kvm_irq_routing_table *rt, + struct kvm_kernel_irq_routing_entry *e, + const struct kvm_irq_routing_entry *ue) +{ + int ret; + + switch (ue->type) { + case KVM_IRQ_ROUTING_S390_ADAPTER: + e->set = set_adapter_int; + e->adapter.summary_addr = ue->u.adapter.summary_addr; + e->adapter.ind_addr = ue->u.adapter.ind_addr; + e->adapter.summary_offset = ue->u.adapter.summary_offset; + e->adapter.ind_offset = ue->u.adapter.ind_offset; + e->adapter.adapter_id = ue->u.adapter.adapter_id; + ret = 0; + break; + default: + ret = -EINVAL; + } + + return ret; +} + +int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm, + int irq_source_id, int level, bool line_status) +{ + return -EINVAL; +} diff --git a/arch/s390/kvm/irq.h b/arch/s390/kvm/irq.h new file mode 100644 index 000000000000..d98e4159643d --- /dev/null +++ b/arch/s390/kvm/irq.h @@ -0,0 +1,22 @@ +/* + * s390 irqchip routines + * + * Copyright IBM Corp. 2014 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (version 2 only) + * as published by the Free Software Foundation. + * + * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> + */ +#ifndef __KVM_IRQ_H +#define __KVM_IRQ_H + +#include <linux/kvm_host.h> + +static inline int irqchip_in_kernel(struct kvm *kvm) +{ + return 1; +} + +#endif diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 2e6fbb0b4f68..ce5b659ec531 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -196,6 +196,10 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) return -EINVAL; switch (cap->cap) { + case KVM_CAP_S390_IRQCHIP: + kvm->arch.use_irqchip = 1; + r = 0; + break; default: r = -EINVAL; break; @@ -228,6 +232,18 @@ long kvm_arch_vm_ioctl(struct file *filp, r = kvm_vm_ioctl_enable_cap(kvm, &cap); break; } + case KVM_CREATE_IRQCHIP: { + struct kvm_irq_routing_entry routing; + + r = -EINVAL; + if (kvm->arch.use_irqchip) { + /* Set up dummy routing. */ + memset(&routing, 0, sizeof(routing)); + kvm_set_irq_routing(kvm, &routing, 0, 0); + r = 0; + } + break; + } default: r = -ENOTTY; } @@ -284,6 +300,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) } kvm->arch.css_support = 0; + kvm->arch.use_irqchip = 0; return 0; out_nogmap: |