From acda5430bee4621f218391d0bcfbe4412adb3554 Mon Sep 17 00:00:00 2001 From: Vladimir Murzin Date: Mon, 12 Sep 2016 15:49:24 +0100 Subject: [PATCH] ARM: KVM: Support vgic-v3 This patch allows to build and use vgic-v3 in 32-bit mode. Unfortunately, it can not be split in several steps without extra stubs to keep patches independent and bisectable. For instance, virt/kvm/arm/vgic/vgic-v3.c uses function from vgic-v3-sr.c, handling access to GICv3 cpu interface from the guest requires vgic_v3.vgic_sre to be already defined. It is how support has been done: * handle SGI requests from the guest * report configured SRE on access to GICv3 cpu interface from the guest * required vgic-v3 macros are provided via uapi.h * static keys are used to select GIC backend * to make vgic-v3 build KVM_ARM_VGIC_V3 guard is removed along with the static inlines Acked-by: Marc Zyngier Reviewed-by: Christoffer Dall Signed-off-by: Vladimir Murzin Signed-off-by: Christoffer Dall --- arch/arm/include/asm/kvm_asm.h | 3 ++ arch/arm/include/asm/kvm_host.h | 5 +++ arch/arm/include/asm/kvm_hyp.h | 3 ++ arch/arm/include/uapi/asm/kvm.h | 7 ++++ arch/arm/kvm/Makefile | 2 ++ arch/arm/kvm/coproc.c | 35 +++++++++++++++++++ arch/arm/kvm/hyp/Makefile | 1 + arch/arm/kvm/hyp/switch.c | 12 +++++-- arch/arm64/kvm/Kconfig | 4 --- include/kvm/arm_vgic.h | 8 ----- virt/kvm/arm/vgic/vgic-kvm-device.c | 8 ----- virt/kvm/arm/vgic/vgic-mmio.c | 2 -- virt/kvm/arm/vgic/vgic-mmio.h | 2 -- virt/kvm/arm/vgic/vgic.h | 54 ----------------------------- 14 files changed, 66 insertions(+), 80 deletions(-) diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h index 05e47faf96a1..d7ea6bcb29bf 100644 --- a/arch/arm/include/asm/kvm_asm.h +++ b/arch/arm/include/asm/kvm_asm.h @@ -72,6 +72,9 @@ extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu); extern void __init_stage2_translation(void); extern void __kvm_hyp_reset(unsigned long); + +extern u64 __vgic_v3_get_ich_vtr_el2(void); +extern void __vgic_v3_init_lrs(void); #endif #endif /* __ARM_KVM_ASM_H__ */ diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index de338d93d11b..c2c40a7ee738 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -39,7 +39,12 @@ #include + +#ifdef CONFIG_ARM_GIC_V3 +#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS +#else #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS +#endif #define KVM_REQ_VCPU_EXIT 8 diff --git a/arch/arm/include/asm/kvm_hyp.h b/arch/arm/include/asm/kvm_hyp.h index e604ad68a06b..343135ede5fa 100644 --- a/arch/arm/include/asm/kvm_hyp.h +++ b/arch/arm/include/asm/kvm_hyp.h @@ -106,6 +106,9 @@ void __vgic_v2_restore_state(struct kvm_vcpu *vcpu); void __sysreg_save_state(struct kvm_cpu_context *ctxt); void __sysreg_restore_state(struct kvm_cpu_context *ctxt); +void __vgic_v3_save_state(struct kvm_vcpu *vcpu); +void __vgic_v3_restore_state(struct kvm_vcpu *vcpu); + void asmlinkage __vfp_save_state(struct vfp_hard_struct *vfp); void asmlinkage __vfp_restore_state(struct vfp_hard_struct *vfp); static inline bool __vfp_enabled(void) diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h index a2b3eb313a25..b38c10c73579 100644 --- a/arch/arm/include/uapi/asm/kvm.h +++ b/arch/arm/include/uapi/asm/kvm.h @@ -84,6 +84,13 @@ struct kvm_regs { #define KVM_VGIC_V2_DIST_SIZE 0x1000 #define KVM_VGIC_V2_CPU_SIZE 0x2000 +/* Supported VGICv3 address types */ +#define KVM_VGIC_V3_ADDR_TYPE_DIST 2 +#define KVM_VGIC_V3_ADDR_TYPE_REDIST 3 + +#define KVM_VGIC_V3_DIST_SIZE SZ_64K +#define KVM_VGIC_V3_REDIST_SIZE (2 * SZ_64K) + #define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */ #define KVM_ARM_VCPU_PSCI_0_2 1 /* CPU uses PSCI v0.2 */ diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile index 339ec88a15a6..f19842ea5418 100644 --- a/arch/arm/kvm/Makefile +++ b/arch/arm/kvm/Makefile @@ -27,8 +27,10 @@ obj-y += $(KVM)/arm/vgic/vgic.o obj-y += $(KVM)/arm/vgic/vgic-init.o obj-y += $(KVM)/arm/vgic/vgic-irqfd.o obj-y += $(KVM)/arm/vgic/vgic-v2.o +obj-y += $(KVM)/arm/vgic/vgic-v3.o obj-y += $(KVM)/arm/vgic/vgic-mmio.o obj-y += $(KVM)/arm/vgic/vgic-mmio-v2.o +obj-y += $(KVM)/arm/vgic/vgic-mmio-v3.o obj-y += $(KVM)/arm/vgic/vgic-kvm-device.o obj-y += $(KVM)/irqchip.o obj-y += $(KVM)/arm/arch_timer.o diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c index 1bb2b79c01ff..3e5e4194ef86 100644 --- a/arch/arm/kvm/coproc.c +++ b/arch/arm/kvm/coproc.c @@ -228,6 +228,35 @@ bool access_vm_reg(struct kvm_vcpu *vcpu, return true; } +static bool access_gic_sgi(struct kvm_vcpu *vcpu, + const struct coproc_params *p, + const struct coproc_reg *r) +{ + u64 reg; + + if (!p->is_write) + return read_from_write_only(vcpu, p); + + reg = (u64)*vcpu_reg(vcpu, p->Rt2) << 32; + reg |= *vcpu_reg(vcpu, p->Rt1) ; + + vgic_v3_dispatch_sgi(vcpu, reg); + + return true; +} + +static bool access_gic_sre(struct kvm_vcpu *vcpu, + const struct coproc_params *p, + const struct coproc_reg *r) +{ + if (p->is_write) + return ignore_write(vcpu, p); + + *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre; + + return true; +} + /* * We could trap ID_DFR0 and tell the guest we don't support performance * monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was @@ -361,10 +390,16 @@ static const struct coproc_reg cp15_regs[] = { { CRn(10), CRm( 3), Op1( 0), Op2( 1), is32, access_vm_reg, reset_unknown, c10_AMAIR1}, + /* ICC_SGI1R */ + { CRm64(12), Op1( 0), is64, access_gic_sgi}, + /* VBAR: swapped by interrupt.S. */ { CRn(12), CRm( 0), Op1( 0), Op2( 0), is32, NULL, reset_val, c12_VBAR, 0x00000000 }, + /* ICC_SRE */ + { CRn(12), CRm(12), Op1( 0), Op2(5), is32, access_gic_sre }, + /* CONTEXTIDR/TPIDRURW/TPIDRURO/TPIDRPRW: swapped by interrupt.S. */ { CRn(13), CRm( 0), Op1( 0), Op2( 1), is32, access_vm_reg, reset_val, c13_CID, 0x00000000 }, diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile index 8dfa5f7f9290..3023bb530edf 100644 --- a/arch/arm/kvm/hyp/Makefile +++ b/arch/arm/kvm/hyp/Makefile @@ -5,6 +5,7 @@ KVM=../../../../virt/kvm obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o +obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v3-sr.o obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/timer-sr.o obj-$(CONFIG_KVM_ARM_HOST) += tlb.o diff --git a/arch/arm/kvm/hyp/switch.c b/arch/arm/kvm/hyp/switch.c index 9da16fd1005f..92678b7bd046 100644 --- a/arch/arm/kvm/hyp/switch.c +++ b/arch/arm/kvm/hyp/switch.c @@ -14,6 +14,7 @@ * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ +#include #include #include @@ -83,14 +84,21 @@ static void __hyp_text __deactivate_vm(struct kvm_vcpu *vcpu) write_sysreg(read_sysreg(MIDR), VPIDR); } + static void __hyp_text __vgic_save_state(struct kvm_vcpu *vcpu) { - __vgic_v2_save_state(vcpu); + if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + __vgic_v3_save_state(vcpu); + else + __vgic_v2_save_state(vcpu); } static void __hyp_text __vgic_restore_state(struct kvm_vcpu *vcpu) { - __vgic_v2_restore_state(vcpu); + if (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + __vgic_v3_restore_state(vcpu); + else + __vgic_v2_restore_state(vcpu); } static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu) diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 7ba91647d1c5..6eaf12c1d627 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -19,9 +19,6 @@ if VIRTUALIZATION config KVM_ARM_VGIC_V3_ITS bool -config KVM_ARM_VGIC_V3 - bool - config KVM bool "Kernel-based Virtual Machine (KVM) support" depends on OF @@ -37,7 +34,6 @@ config KVM select KVM_VFIO select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD - select KVM_ARM_VGIC_V3 select KVM_ARM_VGIC_V3_ITS select KVM_ARM_PMU if HW_PERF_EVENTS select HAVE_KVM_MSI diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 8d22adcfe522..002f0922cd92 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -225,7 +225,6 @@ struct vgic_v2_cpu_if { }; struct vgic_v3_cpu_if { -#ifdef CONFIG_KVM_ARM_VGIC_V3 u32 vgic_hcr; u32 vgic_vmcr; u32 vgic_sre; /* Restored only, change ignored */ @@ -235,7 +234,6 @@ struct vgic_v3_cpu_if { u32 vgic_ap0r[4]; u32 vgic_ap1r[4]; u64 vgic_lr[VGIC_V3_MAX_LRS]; -#endif }; struct vgic_cpu { @@ -304,13 +302,7 @@ bool kvm_vcpu_has_pending_irqs(struct kvm_vcpu *vcpu); void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu); void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu); -#ifdef CONFIG_KVM_ARM_VGIC_V3 void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg); -#else -static inline void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg) -{ -} -#endif /** * kvm_vgic_get_max_vcpus - Get the maximum number of VCPUs allowed by HW diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c index 89ef9bcc6de6..ce1f4ed9daf4 100644 --- a/virt/kvm/arm/vgic/vgic-kvm-device.c +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c @@ -71,7 +71,6 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write) addr_ptr = &vgic->vgic_cpu_base; alignment = SZ_4K; break; -#ifdef CONFIG_KVM_ARM_VGIC_V3 case KVM_VGIC_V3_ADDR_TYPE_DIST: type_needed = KVM_DEV_TYPE_ARM_VGIC_V3; addr_ptr = &vgic->vgic_dist_base; @@ -82,7 +81,6 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write) addr_ptr = &vgic->vgic_redist_base; alignment = SZ_64K; break; -#endif default: r = -ENODEV; goto out; @@ -219,7 +217,6 @@ int kvm_register_vgic_device(unsigned long type) ret = kvm_register_device_ops(&kvm_arm_vgic_v2_ops, KVM_DEV_TYPE_ARM_VGIC_V2); break; -#ifdef CONFIG_KVM_ARM_VGIC_V3 case KVM_DEV_TYPE_ARM_VGIC_V3: ret = kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3); @@ -230,7 +227,6 @@ int kvm_register_vgic_device(unsigned long type) ret = kvm_vgic_register_its_device(); #endif break; -#endif } return ret; @@ -434,8 +430,6 @@ struct kvm_device_ops kvm_arm_vgic_v2_ops = { .has_attr = vgic_v2_has_attr, }; -#ifdef CONFIG_KVM_ARM_VGIC_V3 - static int vgic_v3_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) { @@ -478,5 +472,3 @@ struct kvm_device_ops kvm_arm_vgic_v3_ops = { .get_attr = vgic_v3_get_attr, .has_attr = vgic_v3_has_attr, }; - -#endif /* CONFIG_KVM_ARM_VGIC_V3 */ diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index 3bad3c5ed431..e18b30ddcdce 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -550,11 +550,9 @@ int vgic_register_dist_iodev(struct kvm *kvm, gpa_t dist_base_address, case VGIC_V2: len = vgic_v2_init_dist_iodev(io_device); break; -#ifdef CONFIG_KVM_ARM_VGIC_V3 case VGIC_V3: len = vgic_v3_init_dist_iodev(io_device); break; -#endif default: BUG_ON(1); } diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h index 80f92ceadef2..4c34d39d44a0 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.h +++ b/virt/kvm/arm/vgic/vgic-mmio.h @@ -162,12 +162,10 @@ unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev); unsigned int vgic_v3_init_dist_iodev(struct vgic_io_device *dev); -#ifdef CONFIG_KVM_ARM_VGIC_V3 u64 vgic_sanitise_outer_cacheability(u64 reg); u64 vgic_sanitise_inner_cacheability(u64 reg); u64 vgic_sanitise_shareability(u64 reg); u64 vgic_sanitise_field(u64 reg, u64 field_mask, int field_shift, u64 (*sanitise_fn)(u64)); -#endif #endif diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index 100045f3d98a..9d9e014765a2 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -72,7 +72,6 @@ static inline void vgic_get_irq_kref(struct vgic_irq *irq) kref_get(&irq->refcount); } -#ifdef CONFIG_KVM_ARM_VGIC_V3 void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu); void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu); void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr); @@ -91,60 +90,7 @@ bool vgic_has_its(struct kvm *kvm); int kvm_vgic_register_its_device(void); void vgic_enable_lpis(struct kvm_vcpu *vcpu); int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi); -#endif - #else -static inline void vgic_v3_process_maintenance(struct kvm_vcpu *vcpu) -{ -} - -static inline void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu) -{ -} - -static inline void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, - struct vgic_irq *irq, int lr) -{ -} - -static inline void vgic_v3_clear_lr(struct kvm_vcpu *vcpu, int lr) -{ -} - -static inline void vgic_v3_set_underflow(struct kvm_vcpu *vcpu) -{ -} - -static inline -void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr) -{ -} - -static inline -void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr) -{ -} - -static inline void vgic_v3_enable(struct kvm_vcpu *vcpu) -{ -} - -static inline int vgic_v3_probe(const struct gic_kvm_info *info) -{ - return -ENODEV; -} - -static inline int vgic_v3_map_resources(struct kvm *kvm) -{ - return -ENODEV; -} - -static inline int vgic_register_redist_iodevs(struct kvm *kvm, - gpa_t dist_base_address) -{ - return -ENODEV; -} - static inline int vgic_register_its_iodevs(struct kvm *kvm) { return -ENODEV; -- 2.20.1