@@ -586,8 +586,8 @@ struct kvm_fpu {
4.24 KVM_CREATE_IRQCHIP
-Capability: KVM_CAP_IRQCHIP
-Architectures: x86, ia64, ARM, arm64
+Capability: KVM_CAP_IRQCHIP, KVM_CAP_S390_IRQCHIP (s390)
+Architectures: x86, ia64, ARM, arm64, s390
Type: vm ioctl
Parameters: none
Returns: 0 on success, -1 on error
@@ -596,7 +596,10 @@ Creates an interrupt controller model in the kernel. On x86, creates a virtual
ioapic, a virtual PIC (two PICs, nested), and sets up future vcpus to have a
local APIC. IRQ routing for GSIs 0-15 is set to both PIC and IOAPIC; GSI 16-23
only go to the IOAPIC. On ia64, a IOSAPIC is created. On ARM/arm64, a GIC is
-created.
+created. On s390, a dummy irq routing table is created.
+
+Note that on s390 the KVM_CAP_S390_IRQCHIP vm capability needs to be enabled
+before KVM_CREATE_IRQCHIP can be used.
4.25 KVM_IRQ_LINE
@@ -1322,7 +1325,7 @@ KVM_ASSIGN_DEV_IRQ. Partial deassignment of host or guest IRQ is allowed.
4.52 KVM_SET_GSI_ROUTING
Capability: KVM_CAP_IRQ_ROUTING
-Architectures: x86 ia64
+Architectures: x86 ia64 s390
Type: vm ioctl
Parameters: struct kvm_irq_routing (in)
Returns: 0 on success, -1 on error
@@ -1345,6 +1348,7 @@ struct kvm_irq_routing_entry {
union {
struct kvm_irq_routing_irqchip irqchip;
struct kvm_irq_routing_msi msi;
+ struct kvm_irq_routing_s390_adapter adapter;
__u32 pad[8];
} u;
};
@@ -1352,6 +1356,7 @@ struct kvm_irq_routing_entry {
/* gsi routing entry types */
#define KVM_IRQ_ROUTING_IRQCHIP 1
#define KVM_IRQ_ROUTING_MSI 2
+#define KVM_IRQ_ROUTING_S390_ADAPTER 3
No flags are specified so far, the corresponding field must be set to zero.
@@ -1367,6 +1372,14 @@ struct kvm_irq_routing_msi {
__u32 pad;
};
+struct kvm_irq_routing_s390_adapter {
+ __u64 ind_addr;
+ __u64 summary_addr;
+ __u64 ind_offset;
+ __u32 summary_offset;
+ __u32 adapter_id;
+};
+
4.53 KVM_ASSIGN_SET_MSIX_NR
@@ -82,8 +82,10 @@ struct kvm_s390_io_adapter_req {
mask or unmask the adapter, as specified in mask
KVM_S390_IO_ADAPTER_MAP
- pin a userspace page for the address provided in addr and add it to the
+ perform a gmap translation for the guest address provided in addr,
+ pin a userspace page for the translated address and add it to the
list of mappings
KVM_S390_IO_ADAPTER_UNMAP
- release a userspace page as specified in addr from the list of mappings
+ release a userspace page for the translated address specified in addr
+ from the list of mappings
@@ -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;
@@ -247,6 +255,7 @@ struct kvm_arch_memory_slot {
struct s390_map_info {
struct list_head list;
+ __u64 guest_addr;
__u64 addr;
struct page *page;
};
@@ -270,6 +279,7 @@ 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];
};
@@ -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
@@ -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
@@ -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>
@@ -1115,8 +1116,13 @@ static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
goto out;
}
INIT_LIST_HEAD(&map->list);
- map->addr = addr;
- ret = get_user_pages_fast(addr, 1, 1, &map->page);
+ map->guest_addr = addr;
+ map->addr = gmap_translate(addr, kvm->arch.gmap);
+ if (map->addr == -EFAULT) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
if (ret < 0)
goto out;
BUG_ON(ret != 1);
@@ -1141,7 +1147,7 @@ static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
down_write(&adapter->maps_lock);
list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
- if (map->addr == addr) {
+ if (map->guest_addr == addr) {
found = 1;
list_del(&map->list);
put_page(map->page);
@@ -1269,3 +1275,123 @@ 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;
+}
new file mode 100644
@@ -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
@@ -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:
@@ -297,6 +297,14 @@ static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memsl
return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
}
+struct kvm_s390_adapter_int {
+ u64 ind_addr;
+ u64 summary_addr;
+ u64 ind_offset;
+ u32 summary_offset;
+ u32 adapter_id;
+};
+
struct kvm_kernel_irq_routing_entry {
u32 gsi;
u32 type;
@@ -309,6 +317,7 @@ struct kvm_kernel_irq_routing_entry {
unsigned pin;
} irqchip;
struct msi_msg msi;
+ struct kvm_s390_adapter_int adapter;
};
struct hlist_node link;
};
@@ -741,6 +741,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_EXT_EMUL_CPUID 95
#define KVM_CAP_HYPERV_TIME 96
#define KVM_CAP_ENABLE_CAP_VM 97
+#define KVM_CAP_S390_IRQCHIP 98
#ifdef KVM_CAP_IRQ_ROUTING
@@ -756,9 +757,18 @@ struct kvm_irq_routing_msi {
__u32 pad;
};
+struct kvm_irq_routing_s390_adapter {
+ __u64 ind_addr;
+ __u64 summary_addr;
+ __u64 ind_offset;
+ __u32 summary_offset;
+ __u32 adapter_id;
+};
+
/* gsi routing entry types */
#define KVM_IRQ_ROUTING_IRQCHIP 1
#define KVM_IRQ_ROUTING_MSI 2
+#define KVM_IRQ_ROUTING_S390_ADAPTER 3
struct kvm_irq_routing_entry {
__u32 gsi;
@@ -768,6 +778,7 @@ struct kvm_irq_routing_entry {
union {
struct kvm_irq_routing_irqchip irqchip;
struct kvm_irq_routing_msi msi;
+ struct kvm_irq_routing_s390_adapter adapter;
__u32 pad[8];
} u;
};
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. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> --- Documentation/virtual/kvm/api.txt | 21 +++- Documentation/virtual/kvm/devices/s390_flic.txt | 6 +- arch/s390/include/asm/kvm_host.h | 10 ++ arch/s390/kvm/Kconfig | 2 + arch/s390/kvm/Makefile | 2 +- arch/s390/kvm/interrupt.c | 132 ++++++++++++++++++++++- arch/s390/kvm/irq.h | 22 ++++ arch/s390/kvm/kvm-s390.c | 17 +++ include/linux/kvm_host.h | 9 ++ include/uapi/linux/kvm.h | 11 ++ 10 files changed, 222 insertions(+), 10 deletions(-) create mode 100644 arch/s390/kvm/irq.h