This patch implements vgic_its_has_attr_regs and vgic_its_attr_regs_access
upon the MMIO framework. VGIC ITS KVM device KVM_DEV_ARM_VGIC_GRP_ITS_REGS
group becomes functional.
At least GITS_CREADR requires to differentiate a guest write action from a
user access. As such let's introduce a new uaccess_its_write
vgic_register_region callback.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
virt/kvm/arm/vgic/vgic-its.c | 74 ++++++++++++++++++++++++++++++++++++-------
virt/kvm/arm/vgic/vgic-mmio.h | 9 ++++--
2 files changed, 69 insertions(+), 14 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 43bb17e..e9c8f9f 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1287,13 +1287,14 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm,
*regptr = reg;
}
-#define REGISTER_ITS_DESC(off, rd, wr, length, acc) \
+#define REGISTER_ITS_DESC(off, rd, wr, uwr, length, acc) \
{ \
.reg_offset = off, \
.len = length, \
.access_flags = acc, \
.its_read = rd, \
.its_write = wr, \
+ .uaccess_its_write = uwr, \
}
static void its_mmio_write_wi(struct kvm *kvm, struct vgic_its *its,
@@ -1304,28 +1305,28 @@ static void its_mmio_write_wi(struct kvm *kvm, struct vgic_its *its,
static struct vgic_register_region its_registers[] = {
REGISTER_ITS_DESC(GITS_CTLR,
- vgic_mmio_read_its_ctlr, vgic_mmio_write_its_ctlr, 4,
+ vgic_mmio_read_its_ctlr, vgic_mmio_write_its_ctlr, NULL, 4,
VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_IIDR,
- vgic_mmio_read_its_iidr, its_mmio_write_wi, 4,
+ vgic_mmio_read_its_iidr, its_mmio_write_wi, NULL, 4,
VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_TYPER,
- vgic_mmio_read_its_typer, its_mmio_write_wi, 8,
+ vgic_mmio_read_its_typer, its_mmio_write_wi, NULL, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_CBASER,
- vgic_mmio_read_its_cbaser, vgic_mmio_write_its_cbaser, 8,
+ vgic_mmio_read_its_cbaser, vgic_mmio_write_its_cbaser, NULL, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_CWRITER,
- vgic_mmio_read_its_cwriter, vgic_mmio_write_its_cwriter, 8,
- VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
+ vgic_mmio_read_its_cwriter, vgic_mmio_write_its_cwriter, NULL,
+ 8, VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_CREADR,
- vgic_mmio_read_its_creadr, its_mmio_write_wi, 8,
+ vgic_mmio_read_its_creadr, its_mmio_write_wi, NULL, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_BASER,
- vgic_mmio_read_its_baser, vgic_mmio_write_its_baser, 0x40,
+ vgic_mmio_read_its_baser, vgic_mmio_write_its_baser, NULL, 0x40,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_IDREGS_BASE,
- vgic_mmio_read_its_idregs, its_mmio_write_wi, 0x30,
+ vgic_mmio_read_its_idregs, its_mmio_write_wi, NULL, 0x30,
VGIC_ACCESS_32bit),
};
@@ -1448,14 +1449,63 @@ static void vgic_its_destroy(struct kvm_device *kvm_dev)
int vgic_its_has_attr_regs(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
- return -ENXIO;
+ const struct vgic_register_region *region;
+ struct vgic_io_device iodev = {
+ .regions = its_registers,
+ .nr_regions = ARRAY_SIZE(its_registers),
+ };
+ gpa_t offset;
+
+ offset = attr->attr;
+
+ region = vgic_find_mmio_region(iodev.regions,
+ iodev.nr_regions,
+ offset);
+ if (!region)
+ return -ENXIO;
+ return 0;
}
int vgic_its_attr_regs_access(struct kvm_device *dev,
struct kvm_device_attr *attr,
u64 *reg, bool is_write)
{
- return -ENXIO;
+ const struct vgic_register_region *region;
+ struct vgic_io_device iodev = {
+ .regions = its_registers,
+ .nr_regions = ARRAY_SIZE(its_registers),
+ };
+ struct vgic_its *its = dev->private;
+ gpa_t addr, offset;
+ unsigned int len;
+
+ if (IS_VGIC_ADDR_UNDEF(its->vgic_its_base))
+ return -ENXIO;
+
+ offset = attr->attr;
+ if (offset & 0x7)
+ return -EINVAL;
+
+ addr = its->vgic_its_base + offset;
+
+ region = vgic_find_mmio_region(iodev.regions,
+ iodev.nr_regions,
+ offset);
+ if (!region)
+ return -ENXIO;
+
+ len = region->access_flags & VGIC_ACCESS_64bit ? 8 : 4;
+
+ if (is_write) {
+ if (region->uaccess_its_write)
+ region->uaccess_its_write(dev->kvm, its, addr,
+ len, *reg);
+ else
+ region->its_write(dev->kvm, its, addr, len, *reg);
+ } else {
+ *reg = region->its_read(dev->kvm, its, addr, len);
+ }
+ return 0;
}
static int vgic_its_has_attr(struct kvm_device *dev,
diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h
index 055ad42..ad8a585 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.h
+++ b/virt/kvm/arm/vgic/vgic-mmio.h
@@ -36,8 +36,13 @@ struct vgic_register_region {
};
unsigned long (*uaccess_read)(struct kvm_vcpu *vcpu, gpa_t addr,
unsigned int len);
- void (*uaccess_write)(struct kvm_vcpu *vcpu, gpa_t addr,
- unsigned int len, unsigned long val);
+ union {
+ void (*uaccess_write)(struct kvm_vcpu *vcpu, gpa_t addr,
+ unsigned int len, unsigned long val);
+ void (*uaccess_its_write)(struct kvm *kvm, struct vgic_its *its,
+ gpa_t addr, unsigned int len,
+ unsigned long val);
+ };
};
extern struct kvm_io_device_ops kvm_io_gic_ops;
--
2.5.5
