diff options
author | Jean-Philippe Brucker <jean-philippe.brucker@arm.com> | 2017-11-03 11:38:41 +0000 |
---|---|---|
committer | Will Deacon <will.deacon@arm.com> | 2017-11-03 14:37:00 +0000 |
commit | f6108d72e977cce00e7bc824acd1d73da8cc9729 (patch) | |
tree | f862a7e0b19036498461a8f1005439f56defa7c1 | |
parent | 37b8e06be3ce63d4b50a5066446ca0cb5c61ba43 (diff) | |
download | kvmtool-f6108d72e977cce00e7bc824acd1d73da8cc9729.tar.gz |
Add GICv2m support
GICv2m is a small extension to the GICv2 architecture, specified in the
Server Base System Architecture (SBSA). It adds a set of register to
converts MSIs into SPIs, effectively enabling MSI support for pre-GICv3
platforms.
Implement a GICv2m emulation entirely in userspace. Add a thin translation
layer in irq.c to catch the MSI->SPI routing setup of the guest, and then
transform irqfd injection of MSI into the associated SPI. There shouldn't
be any significant runtime overhead compared to gicv3-its.
The device can be enabled by passing "--irqchip gicv2m" to kvmtool.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
-rw-r--r-- | Makefile | 2 | ||||
-rw-r--r-- | arm/aarch32/include/asm/kvm.h | 2 | ||||
-rw-r--r-- | arm/aarch64/include/asm/kvm.h | 2 | ||||
-rw-r--r-- | arm/gic.c | 13 | ||||
-rw-r--r-- | arm/gicv2m.c | 153 | ||||
-rw-r--r-- | arm/include/arm-common/gic.h | 2 | ||||
-rw-r--r-- | arm/include/arm-common/kvm-config-arch.h | 2 | ||||
-rw-r--r-- | include/kvm/irq.h | 11 | ||||
-rw-r--r-- | irq.c | 61 | ||||
-rw-r--r-- | virtio/pci.c | 4 |
10 files changed, 236 insertions, 16 deletions
@@ -151,7 +151,7 @@ ifeq ($(ARCH), powerpc) endif # ARM -OBJS_ARM_COMMON := arm/fdt.o arm/gic.o arm/ioport.o \ +OBJS_ARM_COMMON := arm/fdt.o arm/gic.o arm/gicv2m.o arm/ioport.o \ arm/kvm.o arm/kvm-cpu.o arm/pci.o arm/timer.o \ arm/pmu.o HDRS_ARM_COMMON := arm/include diff --git a/arm/aarch32/include/asm/kvm.h b/arm/aarch32/include/asm/kvm.h index 6ebd3e6a..02206673 100644 --- a/arm/aarch32/include/asm/kvm.h +++ b/arm/aarch32/include/asm/kvm.h @@ -84,6 +84,8 @@ struct kvm_regs { #define KVM_VGIC_V2_DIST_SIZE 0x1000 #define KVM_VGIC_V2_CPU_SIZE 0x2000 +#define KVM_VGIC_V2M_SIZE 0x1000 + /* Supported VGICv3 address types */ #define KVM_VGIC_V3_ADDR_TYPE_DIST 2 #define KVM_VGIC_V3_ADDR_TYPE_REDIST 3 diff --git a/arm/aarch64/include/asm/kvm.h b/arm/aarch64/include/asm/kvm.h index c2860358..7d14507b 100644 --- a/arm/aarch64/include/asm/kvm.h +++ b/arm/aarch64/include/asm/kvm.h @@ -84,6 +84,8 @@ struct kvm_regs { #define KVM_VGIC_V2_DIST_SIZE 0x1000 #define KVM_VGIC_V2_CPU_SIZE 0x2000 +#define KVM_VGIC_V2M_SIZE 0x1000 + /* Supported VGICv3 address types */ #define KVM_VGIC_V3_ADDR_TYPE_DIST 2 #define KVM_VGIC_V3_ADDR_TYPE_REDIST 3 @@ -24,6 +24,8 @@ int irqchip_parser(const struct option *opt, const char *arg, int unset) if (!strcmp(arg, "gicv2")) { *type = IRQCHIP_GICV2; + } else if (!strcmp(arg, "gicv2m")) { + *type = IRQCHIP_GICV2M; } else if (!strcmp(arg, "gicv3")) { *type = IRQCHIP_GICV3; } else if (!strcmp(arg, "gicv3-its")) { @@ -107,6 +109,8 @@ static int gic__create_msi_frame(struct kvm *kvm, enum irqchip_type type, u64 msi_frame_addr) { switch (type) { + case IRQCHIP_GICV2M: + return gic__create_gicv2m_frame(kvm, msi_frame_addr); case IRQCHIP_GICV3_ITS: return gic__create_its_frame(kvm, msi_frame_addr); default: /* No MSI frame needed */ @@ -138,6 +142,7 @@ static int gic__create_device(struct kvm *kvm, enum irqchip_type type) }; switch (type) { + case IRQCHIP_GICV2M: case IRQCHIP_GICV2: gic_device.type = KVM_DEV_TYPE_ARM_VGIC_V2; dist_attr.attr = KVM_VGIC_V2_ADDR_TYPE_DIST; @@ -156,6 +161,7 @@ static int gic__create_device(struct kvm *kvm, enum irqchip_type type) gic_fd = gic_device.fd; switch (type) { + case IRQCHIP_GICV2M: case IRQCHIP_GICV2: err = ioctl(gic_fd, KVM_SET_DEVICE_ATTR, &cpu_if_attr); break; @@ -216,6 +222,10 @@ int gic__create(struct kvm *kvm, enum irqchip_type type) int err; switch (type) { + case IRQCHIP_GICV2M: + gic_msi_size = KVM_VGIC_V2M_SIZE; + gic_msi_base = ARM_GIC_DIST_BASE - gic_msi_size; + break; case IRQCHIP_GICV2: break; case IRQCHIP_GICV3_ITS: @@ -296,6 +306,9 @@ void gic__generate_fdt_nodes(void *fdt, enum irqchip_type type) }; switch (type) { + case IRQCHIP_GICV2M: + msi_compatible = "arm,gic-v2m-frame"; + /* fall-through */ case IRQCHIP_GICV2: compatible = "arm,cortex-a15-gic"; reg_prop[2] = cpu_to_fdt64(ARM_GIC_CPUI_BASE); diff --git a/arm/gicv2m.c b/arm/gicv2m.c new file mode 100644 index 00000000..d7e6398a --- /dev/null +++ b/arm/gicv2m.c @@ -0,0 +1,153 @@ +#include <errno.h> +#include <stdlib.h> + +#include "kvm/irq.h" +#include "kvm/kvm.h" +#include "kvm/util.h" + +#include "arm-common/gic.h" + +#define GICV2M_MSI_TYPER 0x008 +#define GICV2M_MSI_SETSPI 0x040 +#define GICV2M_MSI_IIDR 0xfcc + +#define GICV2M_SPI_MASK 0x3ff +#define GICV2M_MSI_TYPER_VAL(start, nr) \ + (((start) & GICV2M_SPI_MASK) << 16 | ((nr) & GICV2M_SPI_MASK)) + +struct gicv2m_chip { + int first_spi; + int num_spis; + int *spis; + u64 base; + u64 size; +}; + +static struct gicv2m_chip v2m; + +/* + * MSI routing is setup lazily, when the guest writes the MSI tables. The guest + * writes which SPI is associated to an MSI vector into the message data field. + * The IRQ code notifies us of any change to MSI routing via this callback. + * Store the MSI->SPI translation for later. + * + * Data is the GIC interrupt ID, that includes SGIs and PPIs. SGIs at 0-15, PPIs + * are 16-31 and SPIs are 32-1019. What we're saving for later is the MSI's GSI + * number, a logical ID used by KVM for routing. The GSI of an SPI is implicitly + * defined by KVM to be its pin number (SPI index), and the GSI of an MSI is + * allocated by kvmtool. + */ +static int gicv2m_update_routing(struct kvm *kvm, + struct kvm_irq_routing_entry *entry) +{ + int spi; + + if (entry->type != KVM_IRQ_ROUTING_MSI) + return -EINVAL; + + if (!entry->u.msi.address_hi && !entry->u.msi.address_lo) + return 0; + + spi = entry->u.msi.data & GICV2M_SPI_MASK; + if (spi < v2m.first_spi || spi >= v2m.first_spi + v2m.num_spis) { + pr_err("invalid SPI number %d", spi); + return -EINVAL; + } + + v2m.spis[spi - v2m.first_spi] = entry->gsi; + + return 0; +} + +/* + * Find SPI bound to the given MSI and return the associated GSI. + */ +static int gicv2m_translate_gsi(struct kvm *kvm, u32 gsi) +{ + int i; + + for (i = 0; i < v2m.num_spis; i++) { + if (v2m.spis[i] == (int)gsi) + return i + v2m.first_spi - KVM_IRQ_OFFSET; + } + + /* Not an MSI */ + return gsi; +} + +static bool gicv2m_can_signal_msi(struct kvm *kvm) +{ + return true; +} + +/* + * Instead of setting up MSI routes, virtual devices can also trigger them + * manually (like a direct write to MSI_SETSPI). In this case, trigger the SPI + * directly. + */ +static int gicv2m_signal_msi(struct kvm *kvm, struct kvm_msi *msi) +{ + int spi = msi->data & GICV2M_SPI_MASK; + + if (spi < v2m.first_spi || spi >= v2m.first_spi + v2m.num_spis) { + pr_err("invalid SPI number %d", spi); + return -EINVAL; + } + + kvm__irq_trigger(kvm, spi); + return 0; +} + +static struct msi_routing_ops gicv2m_routing = { + .update_route = gicv2m_update_routing, + .translate_gsi = gicv2m_translate_gsi, + .can_signal_msi = gicv2m_can_signal_msi, + .signal_msi = gicv2m_signal_msi, +}; + +static void gicv2m_mmio_callback(struct kvm_cpu *vcpu, u64 addr, u8 *data, + u32 len, u8 is_write, void *ptr) +{ + if (is_write) + return; + + addr -= v2m.base; + + switch (addr) { + case GICV2M_MSI_TYPER: + *(u32 *)data = GICV2M_MSI_TYPER_VAL(v2m.first_spi, + v2m.num_spis); + break; + case GICV2M_MSI_IIDR: + *(u32 *)data = 0x0; + break; + } +} + +int gic__create_gicv2m_frame(struct kvm *kvm, u64 base) +{ + int i; + int irq = irq__alloc_line(); + + v2m = (struct gicv2m_chip) { + .first_spi = irq, /* Includes GIC_SPI_IRQ_BASE */ + .num_spis = 64, /* arbitrary */ + .base = base, + .size = KVM_VGIC_V2M_SIZE, + }; + + v2m.spis = calloc(v2m.num_spis, sizeof(int)); + if (!v2m.spis) + return -ENOMEM; + + v2m.spis[0] = -1; + for (i = 1; i < v2m.num_spis; i++) { + irq__alloc_line(); + v2m.spis[i] = -1; + } + + msi_routing_ops = &gicv2m_routing; + + return kvm__register_mmio(kvm, base, KVM_VGIC_V2M_SIZE, false, + gicv2m_mmio_callback, kvm); +} diff --git a/arm/include/arm-common/gic.h b/arm/include/arm-common/gic.h index 433dd237..687effc6 100644 --- a/arm/include/arm-common/gic.h +++ b/arm/include/arm-common/gic.h @@ -23,6 +23,7 @@ enum irqchip_type { IRQCHIP_GICV2, + IRQCHIP_GICV2M, IRQCHIP_GICV3, IRQCHIP_GICV3_ITS, }; @@ -31,6 +32,7 @@ struct kvm; int gic__alloc_irqnum(void); int gic__create(struct kvm *kvm, enum irqchip_type type); +int gic__create_gicv2m_frame(struct kvm *kvm, u64 msi_frame_addr); void gic__generate_fdt_nodes(void *fdt, enum irqchip_type type); #endif /* ARM_COMMON__GIC_H */ diff --git a/arm/include/arm-common/kvm-config-arch.h b/arm/include/arm-common/kvm-config-arch.h index f18b2c88..6a196f18 100644 --- a/arm/include/arm-common/kvm-config-arch.h +++ b/arm/include/arm-common/kvm-config-arch.h @@ -28,7 +28,7 @@ int irqchip_parser(const struct option *opt, const char *arg, int unset); "Force virtio devices to use PCI as their default " \ "transport"), \ OPT_CALLBACK('\0', "irqchip", &(cfg)->irqchip, \ - "[gicv2|gicv3|gicv3-its]", \ + "[gicv2|gicv2m|gicv3|gicv3-its]", \ "Type of interrupt controller to emulate in the guest", \ irqchip_parser, NULL), diff --git a/include/kvm/irq.h b/include/kvm/irq.h index ee059e31..429542d8 100644 --- a/include/kvm/irq.h +++ b/include/kvm/irq.h @@ -10,6 +10,14 @@ struct kvm; +struct msi_routing_ops { + int (*update_route)(struct kvm *kvm, struct kvm_irq_routing_entry *); + bool (*can_signal_msi)(struct kvm *kvm); + int (*signal_msi)(struct kvm *kvm, struct kvm_msi *msi); + int (*translate_gsi)(struct kvm *kvm, u32 gsi); +}; + +extern struct msi_routing_ops *msi_routing_ops; extern struct kvm_irq_routing *irq_routing; extern int next_gsi; @@ -23,4 +31,7 @@ int irq__allocate_routing_entry(void); int irq__add_msix_route(struct kvm *kvm, struct msi_msg *msg, u32 device_id); void irq__update_msix_route(struct kvm *kvm, u32 gsi, struct msi_msg *msg); +bool irq__can_signal_msi(struct kvm *kvm); +int irq__signal_msi(struct kvm *kvm, struct kvm_msi *msi); + #endif @@ -13,6 +13,9 @@ static int allocated_gsis = 0; int next_gsi; +struct msi_routing_ops irq__default_routing_ops; +struct msi_routing_ops *msi_routing_ops = &irq__default_routing_ops; + struct kvm_irq_routing *irq_routing = NULL; int irq__alloc_line(void) @@ -66,9 +69,42 @@ static bool check_for_irq_routing(struct kvm *kvm) return has_irq_routing > 0; } +static int irq__update_msix_routes(struct kvm *kvm, + struct kvm_irq_routing_entry *entry) +{ + return ioctl(kvm->vm_fd, KVM_SET_GSI_ROUTING, irq_routing); +} + +static bool irq__default_can_signal_msi(struct kvm *kvm) +{ + return kvm__supports_extension(kvm, KVM_CAP_SIGNAL_MSI); +} + +static int irq__default_signal_msi(struct kvm *kvm, struct kvm_msi *msi) +{ + return ioctl(kvm->vm_fd, KVM_SIGNAL_MSI, msi); +} + +struct msi_routing_ops irq__default_routing_ops = { + .update_route = irq__update_msix_routes, + .signal_msi = irq__default_signal_msi, + .can_signal_msi = irq__default_can_signal_msi, +}; + +bool irq__can_signal_msi(struct kvm *kvm) +{ + return msi_routing_ops->can_signal_msi(kvm); +} + +int irq__signal_msi(struct kvm *kvm, struct kvm_msi *msi) +{ + return msi_routing_ops->signal_msi(kvm, msi); +} + int irq__add_msix_route(struct kvm *kvm, struct msi_msg *msg, u32 device_id) { int r; + struct kvm_irq_routing_entry *entry; if (!check_for_irq_routing(kvm)) return -ENXIO; @@ -77,22 +113,23 @@ int irq__add_msix_route(struct kvm *kvm, struct msi_msg *msg, u32 device_id) if (r) return r; - irq_routing->entries[irq_routing->nr] = - (struct kvm_irq_routing_entry) { - .gsi = next_gsi, - .type = KVM_IRQ_ROUTING_MSI, - .u.msi.address_hi = msg->address_hi, - .u.msi.address_lo = msg->address_lo, - .u.msi.data = msg->data, - }; + entry = &irq_routing->entries[irq_routing->nr]; + *entry = (struct kvm_irq_routing_entry) { + .gsi = next_gsi, + .type = KVM_IRQ_ROUTING_MSI, + .u.msi.address_hi = msg->address_hi, + .u.msi.address_lo = msg->address_lo, + .u.msi.data = msg->data, + }; if (kvm->msix_needs_devid) { - irq_routing->entries[irq_routing->nr].flags = KVM_MSI_VALID_DEVID; - irq_routing->entries[irq_routing->nr].u.msi.devid = device_id; + entry->flags = KVM_MSI_VALID_DEVID; + entry->u.msi.devid = device_id; } + irq_routing->nr++; - r = ioctl(kvm->vm_fd, KVM_SET_GSI_ROUTING, irq_routing); + r = msi_routing_ops->update_route(kvm, entry); if (r) return r; @@ -129,7 +166,7 @@ void irq__update_msix_route(struct kvm *kvm, u32 gsi, struct msi_msg *msg) if (!changed) return; - if (ioctl(kvm->vm_fd, KVM_SET_GSI_ROUTING, irq_routing) == -1) + if (msi_routing_ops->update_route(kvm, &irq_routing->entries[i])) die_perror("KVM_SET_GSI_ROUTING"); } diff --git a/virtio/pci.c b/virtio/pci.c index 46473b00..4ce11110 100644 --- a/virtio/pci.c +++ b/virtio/pci.c @@ -350,7 +350,7 @@ static void virtio_pci__signal_msi(struct kvm *kvm, struct virtio_pci *vpci, msi.devid = vpci->dev_hdr.dev_num << 3; } - ioctl(kvm->vm_fd, KVM_SIGNAL_MSI, &msi); + irq__signal_msi(kvm, &msi); } int virtio_pci__signal_vq(struct kvm *kvm, struct virtio_device *vdev, u32 vq) @@ -488,7 +488,7 @@ int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev, vpci->pci_hdr.msix.pba_offset = cpu_to_le32(2 | PCI_IO_SIZE); vpci->config_vector = 0; - if (kvm__supports_extension(kvm, KVM_CAP_SIGNAL_MSI)) + if (irq__can_signal_msi(kvm)) vpci->features |= VIRTIO_PCI_F_SIGNAL_MSI; r = device__register(&vpci->dev_hdr); |