On Mon, Apr 11, 2016 at 02:00:02PM +0100, Andre Przywara wrote: > Hi, > > On 31/03/16 12:53, Christoffer Dall wrote: > > On Fri, Mar 25, 2016 at 02:04:47AM +0000, Andre Przywara wrote: > >> As in the GICv2 emulation we handle those three registers in one > >> function. > >> > >> Signed-off-by: Andre Przywara <[email protected]> > >> --- > >> virt/kvm/arm/vgic/vgic.h | 2 ++ > >> virt/kvm/arm/vgic/vgic_mmio.c | 38 ++++++++++++++++++++++++++++++++++++-- > >> 2 files changed, 38 insertions(+), 2 deletions(-) > >> > >> diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h > >> index 4b8952a..0db1abe 100644 > >> --- a/virt/kvm/arm/vgic/vgic.h > >> +++ b/virt/kvm/arm/vgic/vgic.h > >> @@ -19,6 +19,8 @@ > >> #define PRODUCT_ID_KVM 0x4b /* ASCII code K */ > >> #define IMPLEMENTER_ARM 0x43b > >> > >> +#define INTERRUPT_ID_BITS_SPIS 10 > >> + > >> struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu, > >> u32 intid); > >> bool vgic_queue_irq(struct kvm *kvm, struct vgic_irq *irq); > >> diff --git a/virt/kvm/arm/vgic/vgic_mmio.c b/virt/kvm/arm/vgic/vgic_mmio.c > >> index 2d10c06..13e101f 100644 > >> --- a/virt/kvm/arm/vgic/vgic_mmio.c > >> +++ b/virt/kvm/arm/vgic/vgic_mmio.c > >> @@ -606,7 +606,29 @@ static int vgic_mmio_read_v3_misc(struct kvm_vcpu > >> *vcpu, > >> struct kvm_io_device *this, > >> gpa_t addr, int len, void *val) > >> { > >> - /* TODO: implement */ > >> + struct vgic_io_device *iodev = container_of(this, > >> + struct vgic_io_device, dev); > >> + u32 value = 0; > >> + > >> + switch ((addr - iodev->base_addr) & ~3) { > >> + case GICD_CTLR: > >> + if (vcpu->kvm->arch.vgic.enabled) > >> + value |= GICD_CTLR_ENABLE_SS_G1; > >> + value |= GICD_CTLR_ARE_NS | GICD_CTLR_DS; > >> + break; > >> + case GICD_TYPER: > >> + value = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS; > >> + value = (value >> 5) - 1; > >> + value |= (INTERRUPT_ID_BITS_SPIS - 1) << 19; > >> + break; > >> + case GICD_IIDR: > >> + value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0); > >> + break; > >> + default: > >> + return 0; > >> + } > >> + > >> + write_mask32(value, addr & 3, len, val); > >> return 0; > >> } > >> > >> @@ -614,7 +636,19 @@ static int vgic_mmio_write_v3_misc(struct kvm_vcpu > >> *vcpu, > >> struct kvm_io_device *this, > >> gpa_t addr, int len, const void *val) > >> { > >> - /* TODO: implement */ > >> + struct vgic_io_device *iodev = container_of(this, > >> + struct vgic_io_device, dev); > >> + bool enabled; > >> + > >> + /* These are not the bits you are looking for ... */ > > > > haha, nice. But I don't understand what this case is? > > Of the 16 bytes this region covers (CTLR, TYPER, IIDR) only the first > byte is writeable, the rest is WI. > I am afraid I have to replace the cool quote with something more > meaningful ... >
You can maintain the fun quote and supplement it with a boring explanation. > >> + if (addr - iodev->base_addr > 0) > >> + return 0; > >> + > >> + /* We only care about the enable bit, all other bits are WI. */ > >> + enabled = *(u8*)val & GICD_CTLR_ENABLE_SS_G1; > >> + > >> + vcpu->kvm->arch.vgic.enabled = enabled; > > > > I think some of the comments from the v2 side apply here as well. > > Agreed. > Thanks, -Christoffer _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
