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KVM: arm/arm64: merge GICv3 RD_base and SGI_base register frames 

Currently we handle the redistributor registers in two separate MMIO
regions, one for the overall behaviour and SPIs and one for the
SGIs/PPIs. That latter forces the creation of _two_ KVM I/O bus
devices for each redistributor.
Since the spec mandates those two pages to be contigious, we could as
well merge them and save the churn with the second KVM I/O bus device.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Andre Przywara 2015-03-26 14:39:36 +00:00 committed by Marc Zyngier
parent a9cf86f62b
commit 0ba10d5392
1 changed files with 105 additions and 113 deletions
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218
virt/kvm/arm/vgic-v3-emul.c
View File

@ -502,6 +502,43 @@ static const struct vgic_io_range vgic_v3_dist_ranges[] = {
{},
};
static bool handle_mmio_ctlr_redist(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
/* since we don't support LPIs, this register is zero for now */
vgic_reg_access(mmio, NULL, offset,
ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
return false;
}
static bool handle_mmio_typer_redist(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
u32 reg;
u64 mpidr;
struct kvm_vcpu *redist_vcpu = mmio->private;
int target_vcpu_id = redist_vcpu->vcpu_id;
/* the upper 32 bits contain the affinity value */
if ((offset & ~3) == 4) {
mpidr = kvm_vcpu_get_mpidr_aff(redist_vcpu);
reg = compress_mpidr(mpidr);
vgic_reg_access(mmio, &reg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
return false;
}
reg = redist_vcpu->vcpu_id << 8;
if (target_vcpu_id == atomic_read(&vcpu->kvm->online_vcpus) - 1)
reg |= GICR_TYPER_LAST;
vgic_reg_access(mmio, &reg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
return false;
}
static bool handle_mmio_set_enable_reg_redist(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
@ -570,111 +607,7 @@ static bool handle_mmio_cfg_reg_redist(struct kvm_vcpu *vcpu,
return vgic_handle_cfg_reg(reg, mmio, offset);
}
static const struct vgic_io_range vgic_redist_sgi_ranges[] = {
{
.base = GICR_IGROUPR0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_rao_wi,
},
{
.base = GICR_ISENABLER0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_enable_reg_redist,
},
{
.base = GICR_ICENABLER0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_enable_reg_redist,
},
{
.base = GICR_ISPENDR0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_pending_reg_redist,
},
{
.base = GICR_ICPENDR0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_pending_reg_redist,
},
{
.base = GICR_ISACTIVER0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = GICR_ICACTIVER0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = GICR_IPRIORITYR0,
.len = 0x20,
.bits_per_irq = 8,
.handle_mmio = handle_mmio_priority_reg_redist,
},
{
.base = GICR_ICFGR0,
.len = 0x08,
.bits_per_irq = 2,
.handle_mmio = handle_mmio_cfg_reg_redist,
},
{
.base = GICR_IGRPMODR0,
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = GICR_NSACR,
.len = 0x04,
.handle_mmio = handle_mmio_raz_wi,
},
{},
};
static bool handle_mmio_ctlr_redist(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
/* since we don't support LPIs, this register is zero for now */
vgic_reg_access(mmio, NULL, offset,
ACCESS_READ_RAZ | ACCESS_WRITE_IGNORED);
return false;
}
static bool handle_mmio_typer_redist(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
{
u32 reg;
u64 mpidr;
struct kvm_vcpu *redist_vcpu = mmio->private;
int target_vcpu_id = redist_vcpu->vcpu_id;
/* the upper 32 bits contain the affinity value */
if ((offset & ~3) == 4) {
mpidr = kvm_vcpu_get_mpidr_aff(redist_vcpu);
reg = compress_mpidr(mpidr);
vgic_reg_access(mmio, &reg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
return false;
}
reg = redist_vcpu->vcpu_id << 8;
if (target_vcpu_id == atomic_read(&vcpu->kvm->online_vcpus) - 1)
reg |= GICR_TYPER_LAST;
vgic_reg_access(mmio, &reg, offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
return false;
}
#define SGI_base(x) ((x) + SZ_64K)
static const struct vgic_io_range vgic_redist_ranges[] = {
{
@ -707,6 +640,71 @@ static const struct vgic_io_range vgic_redist_ranges[] = {
.bits_per_irq = 0,
.handle_mmio = handle_mmio_idregs,
},
{
.base = SGI_base(GICR_IGROUPR0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_rao_wi,
},
{
.base = SGI_base(GICR_ISENABLER0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_enable_reg_redist,
},
{
.base = SGI_base(GICR_ICENABLER0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_enable_reg_redist,
},
{
.base = SGI_base(GICR_ISPENDR0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_set_pending_reg_redist,
},
{
.base = SGI_base(GICR_ICPENDR0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_clear_pending_reg_redist,
},
{
.base = SGI_base(GICR_ISACTIVER0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = SGI_base(GICR_ICACTIVER0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = SGI_base(GICR_IPRIORITYR0),
.len = 0x20,
.bits_per_irq = 8,
.handle_mmio = handle_mmio_priority_reg_redist,
},
{
.base = SGI_base(GICR_ICFGR0),
.len = 0x08,
.bits_per_irq = 2,
.handle_mmio = handle_mmio_cfg_reg_redist,
},
{
.base = SGI_base(GICR_IGRPMODR0),
.len = 0x04,
.bits_per_irq = 1,
.handle_mmio = handle_mmio_raz_wi,
},
{
.base = SGI_base(GICR_NSACR),
.len = 0x04,
.handle_mmio = handle_mmio_raz_wi,
},
{},
};
@ -726,7 +724,6 @@ static bool vgic_v3_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
unsigned long rdbase = dist->vgic_redist_base;
int nrcpus = atomic_read(&vcpu->kvm->online_vcpus);
int vcpu_id;
const struct vgic_io_range *mmio_range;
if (is_in_range(mmio->phys_addr, mmio->len, dbase, GIC_V3_DIST_SIZE)) {
return vgic_handle_mmio_range(vcpu, run, mmio,
@ -741,13 +738,8 @@ static bool vgic_v3_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
rdbase += (vcpu_id * GIC_V3_REDIST_SIZE);
mmio->private = kvm_get_vcpu(vcpu->kvm, vcpu_id);
if (mmio->phys_addr >= rdbase + SGI_BASE_OFFSET) {
rdbase += SGI_BASE_OFFSET;
mmio_range = vgic_redist_sgi_ranges;
} else {
mmio_range = vgic_redist_ranges;
}
return vgic_handle_mmio_range(vcpu, run, mmio, mmio_range, rdbase);
return vgic_handle_mmio_range(vcpu, run, mmio, vgic_redist_ranges,
rdbase);
}
static bool vgic_v3_queue_sgi(struct kvm_vcpu *vcpu, int irq)