diff options
| author | Andre Przywara <andre.przywara@arm.com> | 2016-01-27 14:54:46 +0000 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-05-20 15:39:57 +0200 |
| commit | 741972d8a69ce748d84dfe0d68403054dfcae657 (patch) | |
| tree | 104b90d009557d778f41c393d6cf983ca844269d /virt | |
| parent | fd59ed3be17e414aa3400f35d0f5faa01dd74185 (diff) | |
| download | lwn-741972d8a69ce748d84dfe0d68403054dfcae657.tar.gz lwn-741972d8a69ce748d84dfe0d68403054dfcae657.zip | |
KVM: arm/arm64: vgic-new: Add GICv3 redistributor IIDR and TYPER handler
The redistributor TYPER tells the OS about the associated MPIDR,
also the LAST bit is crucial to determine the number of redistributors.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio-v3.c | 32 |
1 files changed, 30 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c index bd062b8f7ba8..64edd2354334 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c @@ -22,6 +22,13 @@ #include "vgic.h" #include "vgic-mmio.h" +/* extract @num bytes at @offset bytes offset in data */ +static unsigned long extract_bytes(unsigned long data, unsigned int offset, + unsigned int num) +{ + return (data >> (offset * 8)) & GENMASK_ULL(num * 8 - 1, 0); +} + static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len) { @@ -68,6 +75,27 @@ static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu, } } +static unsigned long vgic_mmio_read_v3r_typer(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len) +{ + unsigned long mpidr = kvm_vcpu_get_mpidr_aff(vcpu); + int target_vcpu_id = vcpu->vcpu_id; + u64 value; + + value = (mpidr & GENMASK(23, 0)) << 32; + value |= ((target_vcpu_id & 0xffff) << 8); + if (target_vcpu_id == atomic_read(&vcpu->kvm->online_vcpus) - 1) + value |= GICR_TYPER_LAST; + + return extract_bytes(value, addr & 7, len); +} + +static unsigned long vgic_mmio_read_v3r_iidr(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len) +{ + return (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0); +} + /* * The GICv3 per-IRQ registers are split to control PPIs and SGIs in the * redistributors, while SPIs are covered by registers in the distributor @@ -142,10 +170,10 @@ static const struct vgic_register_region vgic_v3_rdbase_registers[] = { vgic_mmio_read_raz, vgic_mmio_write_wi, 4, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICR_IIDR, - vgic_mmio_read_raz, vgic_mmio_write_wi, 4, + vgic_mmio_read_v3r_iidr, vgic_mmio_write_wi, 4, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICR_TYPER, - vgic_mmio_read_raz, vgic_mmio_write_wi, 8, + vgic_mmio_read_v3r_typer, vgic_mmio_write_wi, 8, VGIC_ACCESS_64bit | VGIC_ACCESS_32bit), REGISTER_DESC_WITH_LENGTH(GICR_PROPBASER, vgic_mmio_read_raz, vgic_mmio_write_wi, 8, |