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KVM: arm64: vgic-its: Implement vgic_mmio_uaccess_write_its_iidr

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The GITS_IIDR revision field is used to encode the migration ABI
revision. So we need to restore it to check the table layout is
readable by the destination.

By writing the IIDR, userspace thus forces the ABI revision to be
used and this must be less than or equal to the max revision KVM
supports.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
This commit is contained in:
Eric Auger 2017-03-23 15:14:00 +01:00 committed by Christoffer Dall
parent 71afe470e2
commit ab01c6bdac
2 changed files with 25 additions and 3 deletions
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5
include/linux/irqchip/arm-gic-v3.h
View file

@ -242,6 +242,11 @@
#define GITS_TYPER_PTA (1UL << 19)
#define GITS_TYPER_HWCOLLCNT_SHIFT 24
#define GITS_IIDR_REV_SHIFT 12
#define GITS_IIDR_REV_MASK (0xf << GITS_IIDR_REV_SHIFT)
#define GITS_IIDR_REV(r) (((r) >> GITS_IIDR_REV_SHIFT) & 0xf)
#define GITS_IIDR_PRODUCTID_SHIFT 24
#define GITS_CBASER_VALID (1ULL << 63)
#define GITS_CBASER_SHAREABILITY_SHIFT (10)
#define GITS_CBASER_INNER_CACHEABILITY_SHIFT (59)

23
virt/kvm/arm/vgic/vgic-its.c
View file

@ -434,7 +434,23 @@ static unsigned long vgic_mmio_read_its_iidr(struct kvm *kvm,
struct vgic_its *its,
gpa_t addr, unsigned int len)
{
return (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
u32 val;
val = (its->abi_rev << GITS_IIDR_REV_SHIFT) & GITS_IIDR_REV_MASK;
val |= (PRODUCT_ID_KVM << GITS_IIDR_PRODUCTID_SHIFT) | IMPLEMENTER_ARM;
return val;
}
static int vgic_mmio_uaccess_write_its_iidr(struct kvm *kvm,
struct vgic_its *its,
gpa_t addr, unsigned int len,
unsigned long val)
{
u32 rev = GITS_IIDR_REV(val);
if (rev >= NR_ITS_ABIS)
return -EINVAL;
return vgic_its_set_abi(its, rev);
}
static unsigned long vgic_mmio_read_its_idregs(struct kvm *kvm,
@ -1415,8 +1431,9 @@ static struct vgic_register_region its_registers[] = {
REGISTER_ITS_DESC(GITS_CTLR,
vgic_mmio_read_its_ctlr, vgic_mmio_write_its_ctlr, 4,
VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_IIDR,
vgic_mmio_read_its_iidr, its_mmio_write_wi, 4,
REGISTER_ITS_DESC_UACCESS(GITS_IIDR,
vgic_mmio_read_its_iidr, its_mmio_write_wi,
vgic_mmio_uaccess_write_its_iidr, 4,
VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_TYPER,
vgic_mmio_read_its_typer, its_mmio_write_wi, 8,