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Message-Id: <20190823173330.23342-1-eric.auger@redhat.com>
Date: Fri, 23 Aug 2019 19:33:30 +0200
From: Eric Auger <eric.auger@...hat.com>
To: eric.auger.pro@...il.com, eric.auger@...hat.com, maz@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
kvmarm@...ts.cs.columbia.edu
Cc: yuzenghui@...wei.com, zhang.zhanghailiang@...wei.com,
wanghaibin.wang@...wei.com, james.morse@....com,
qemu-arm@...gnu.org, julien.thierry.kdev@...il.com,
suzuki.poulose@....com, peter.maydell@...aro.org,
andre.przywara@....com
Subject: [PATCH] KVM: arm/arm64: vgic: Use a single IO device per redistributor
At the moment we use 2 IO devices per GICv3 redistributor: one
one for the RD_base frame and one for the SGI_base frame.
Instead we can use a single IO device per redistributor (the 2
frames are contiguous). This saves slots on the KVM_MMIO_BUS
which is currently limited to NR_IOBUS_DEVS (1000).
This change allows to instantiate up to 512 redistributors and may
speed the guest boot with a large number of VCPUs.
Signed-off-by: Eric Auger <eric.auger@...hat.com>
---
include/kvm/arm_vgic.h | 1 -
virt/kvm/arm/vgic/vgic-init.c | 1 -
virt/kvm/arm/vgic/vgic-mmio-v3.c | 81 ++++++++++----------------------
3 files changed, 24 insertions(+), 59 deletions(-)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 7a30524a80ee..004f6e9d3b05 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -311,7 +311,6 @@ struct vgic_cpu {
* parts of the redistributor.
*/
struct vgic_io_device rd_iodev;
- struct vgic_io_device sgi_iodev;
struct vgic_redist_region *rdreg;
/* Contains the attributes and gpa of the LPI pending tables. */
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index bdbc297d06fb..eaff7031a089 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -192,7 +192,6 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
int i;
vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
- vgic_cpu->sgi_iodev.base_addr = VGIC_ADDR_UNDEF;
INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
raw_spin_lock_init(&vgic_cpu->ap_list_lock);
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index c45e2d7e942f..400067085cab 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -515,7 +515,8 @@ static const struct vgic_register_region vgic_v3_dist_registers[] = {
VGIC_ACCESS_32bit),
};
-static const struct vgic_register_region vgic_v3_rdbase_registers[] = {
+static const struct vgic_register_region vgic_v3_rd_registers[] = {
+ /* RD_base registers */
REGISTER_DESC_WITH_LENGTH(GICR_CTLR,
vgic_mmio_read_v3r_ctlr, vgic_mmio_write_v3r_ctlr, 4,
VGIC_ACCESS_32bit),
@@ -540,44 +541,42 @@ static const struct vgic_register_region vgic_v3_rdbase_registers[] = {
REGISTER_DESC_WITH_LENGTH(GICR_IDREGS,
vgic_mmio_read_v3_idregs, vgic_mmio_write_wi, 48,
VGIC_ACCESS_32bit),
-};
-
-static const struct vgic_register_region vgic_v3_sgibase_registers[] = {
- REGISTER_DESC_WITH_LENGTH(GICR_IGROUPR0,
+ /* SGI_base registers */
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IGROUPR0,
vgic_mmio_read_group, vgic_mmio_write_group, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(GICR_ISENABLER0,
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_ISENABLER0,
vgic_mmio_read_enable, vgic_mmio_write_senable, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(GICR_ICENABLER0,
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_ICENABLER0,
vgic_mmio_read_enable, vgic_mmio_write_cenable, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH_UACCESS(GICR_ISPENDR0,
+ REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISPENDR0,
vgic_mmio_read_pending, vgic_mmio_write_spending,
vgic_v3_uaccess_read_pending, vgic_v3_uaccess_write_pending, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH_UACCESS(GICR_ICPENDR0,
+ REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ICPENDR0,
vgic_mmio_read_pending, vgic_mmio_write_cpending,
vgic_mmio_read_raz, vgic_mmio_uaccess_write_wi, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH_UACCESS(GICR_ISACTIVER0,
+ REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ISACTIVER0,
vgic_mmio_read_active, vgic_mmio_write_sactive,
NULL, vgic_mmio_uaccess_write_sactive,
4, VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH_UACCESS(GICR_ICACTIVER0,
+ REGISTER_DESC_WITH_LENGTH_UACCESS(SZ_64K + GICR_ICACTIVER0,
vgic_mmio_read_active, vgic_mmio_write_cactive,
NULL, vgic_mmio_uaccess_write_cactive,
4, VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(GICR_IPRIORITYR0,
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IPRIORITYR0,
vgic_mmio_read_priority, vgic_mmio_write_priority, 32,
VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
- REGISTER_DESC_WITH_LENGTH(GICR_ICFGR0,
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_ICFGR0,
vgic_mmio_read_config, vgic_mmio_write_config, 8,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(GICR_IGRPMODR0,
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_IGRPMODR0,
vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
VGIC_ACCESS_32bit),
- REGISTER_DESC_WITH_LENGTH(GICR_NSACR,
+ REGISTER_DESC_WITH_LENGTH(SZ_64K + GICR_NSACR,
vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
VGIC_ACCESS_32bit),
};
@@ -607,9 +606,8 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
struct vgic_dist *vgic = &kvm->arch.vgic;
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;
- struct vgic_io_device *sgi_dev = &vcpu->arch.vgic_cpu.sgi_iodev;
struct vgic_redist_region *rdreg;
- gpa_t rd_base, sgi_base;
+ gpa_t rd_base;
int ret;
if (!IS_VGIC_ADDR_UNDEF(vgic_cpu->rd_iodev.base_addr))
@@ -631,52 +629,31 @@ int vgic_register_redist_iodev(struct kvm_vcpu *vcpu)
vgic_cpu->rdreg = rdreg;
rd_base = rdreg->base + rdreg->free_index * KVM_VGIC_V3_REDIST_SIZE;
- sgi_base = rd_base + SZ_64K;
kvm_iodevice_init(&rd_dev->dev, &kvm_io_gic_ops);
rd_dev->base_addr = rd_base;
rd_dev->iodev_type = IODEV_REDIST;
- rd_dev->regions = vgic_v3_rdbase_registers;
- rd_dev->nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers);
+ rd_dev->regions = vgic_v3_rd_registers;
+ rd_dev->nr_regions = ARRAY_SIZE(vgic_v3_rd_registers);
rd_dev->redist_vcpu = vcpu;
mutex_lock(&kvm->slots_lock);
ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, rd_base,
- SZ_64K, &rd_dev->dev);
+ 2 * SZ_64K, &rd_dev->dev);
mutex_unlock(&kvm->slots_lock);
if (ret)
return ret;
- kvm_iodevice_init(&sgi_dev->dev, &kvm_io_gic_ops);
- sgi_dev->base_addr = sgi_base;
- sgi_dev->iodev_type = IODEV_REDIST;
- sgi_dev->regions = vgic_v3_sgibase_registers;
- sgi_dev->nr_regions = ARRAY_SIZE(vgic_v3_sgibase_registers);
- sgi_dev->redist_vcpu = vcpu;
-
- mutex_lock(&kvm->slots_lock);
- ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, sgi_base,
- SZ_64K, &sgi_dev->dev);
- if (ret) {
- kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
- &rd_dev->dev);
- goto out;
- }
-
rdreg->free_index++;
-out:
- mutex_unlock(&kvm->slots_lock);
- return ret;
+ return 0;
}
static void vgic_unregister_redist_iodev(struct kvm_vcpu *vcpu)
{
struct vgic_io_device *rd_dev = &vcpu->arch.vgic_cpu.rd_iodev;
- struct vgic_io_device *sgi_dev = &vcpu->arch.vgic_cpu.sgi_iodev;
kvm_io_bus_unregister_dev(vcpu->kvm, KVM_MMIO_BUS, &rd_dev->dev);
- kvm_io_bus_unregister_dev(vcpu->kvm, KVM_MMIO_BUS, &sgi_dev->dev);
}
static int vgic_register_all_redist_iodevs(struct kvm *kvm)
@@ -826,8 +803,8 @@ int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
iodev.base_addr = 0;
break;
case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:{
- iodev.regions = vgic_v3_rdbase_registers;
- iodev.nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers);
+ iodev.regions = vgic_v3_rd_registers;
+ iodev.nr_regions = ARRAY_SIZE(vgic_v3_rd_registers);
iodev.base_addr = 0;
break;
}
@@ -985,21 +962,11 @@ int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
int offset, u32 *val)
{
struct vgic_io_device rd_dev = {
- .regions = vgic_v3_rdbase_registers,
- .nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers),
+ .regions = vgic_v3_rd_registers,
+ .nr_regions = ARRAY_SIZE(vgic_v3_rd_registers),
};
- struct vgic_io_device sgi_dev = {
- .regions = vgic_v3_sgibase_registers,
- .nr_regions = ARRAY_SIZE(vgic_v3_sgibase_registers),
- };
-
- /* SGI_base is the next 64K frame after RD_base */
- if (offset >= SZ_64K)
- return vgic_uaccess(vcpu, &sgi_dev, is_write, offset - SZ_64K,
- val);
- else
- return vgic_uaccess(vcpu, &rd_dev, is_write, offset, val);
+ return vgic_uaccess(vcpu, &rd_dev, is_write, offset, val);
}
int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
--
2.20.1
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