[PATCH v3 8/8] ARM: KVM: Support vgic-v3
Vladimir Murzin
vladimir.murzin at arm.com
Thu Sep 8 09:06:50 PDT 2016
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:
* vgic-v3 save/restore routines are written in such way that they map
arm64 system register naming nicely, but it does not fit to arm
world. To keep virt/kvm/arm/hyp/vgic-v3-sr.c untouched we create a
mapping with a function for each register mapping the 32-bit to the
64-bit accessors
* 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
Signed-off-by: Vladimir Murzin <vladimir.murzin at arm.com>
---
arch/arm/include/asm/arch_gicv3.h | 64 +++++++++++++++++++++++++++++++++++
arch/arm/include/asm/kvm_asm.h | 3 ++
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 | 36 ++++++++++++++++++++
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, 126 insertions(+), 80 deletions(-)
diff --git a/arch/arm/include/asm/arch_gicv3.h b/arch/arm/include/asm/arch_gicv3.h
index af25c32..f93f6bd 100644
--- a/arch/arm/include/asm/arch_gicv3.h
+++ b/arch/arm/include/asm/arch_gicv3.h
@@ -96,6 +96,70 @@
#define ICH_AP1R2 __AP1Rx(2)
#define ICH_AP1R3 __AP1Rx(3)
+/* A32-to-A64 mappings used by VGIC save/restore */
+
+#define CPUIF_MAP(a32, a64) \
+static inline void write_ ## a64(u32 val) \
+{ \
+ write_sysreg(val, a32); \
+} \
+static inline u32 read_ ## a64(void) \
+{ \
+ return read_sysreg(a32); \
+} \
+
+#define CPUIF_MAP_LO_HI(a32lo, a32hi, a64) \
+static inline void write_ ## a64(u64 val) \
+{ \
+ write_sysreg((u32)val, a32lo); \
+ write_sysreg((u32)(val >> 32), a32hi); \
+} \
+static inline u64 read_ ## a64(void) \
+{ \
+ u64 val = read_sysreg(a32lo); \
+ \
+ val |= (u64)read_sysreg(a32hi) << 32; \
+ \
+ return val; \
+}
+
+CPUIF_MAP(ICH_HCR, ICH_HCR_EL2)
+CPUIF_MAP(ICH_VTR, ICH_VTR_EL2)
+CPUIF_MAP(ICH_MISR, ICH_MISR_EL2)
+CPUIF_MAP(ICH_EISR, ICH_EISR_EL2)
+CPUIF_MAP(ICH_ELSR, ICH_ELSR_EL2)
+CPUIF_MAP(ICH_VMCR, ICH_VMCR_EL2)
+CPUIF_MAP(ICH_AP0R3, ICH_AP0R3_EL2)
+CPUIF_MAP(ICH_AP0R2, ICH_AP0R2_EL2)
+CPUIF_MAP(ICH_AP0R1, ICH_AP0R1_EL2)
+CPUIF_MAP(ICH_AP0R0, ICH_AP0R0_EL2)
+CPUIF_MAP(ICH_AP1R3, ICH_AP1R3_EL2)
+CPUIF_MAP(ICH_AP1R2, ICH_AP1R2_EL2)
+CPUIF_MAP(ICH_AP1R1, ICH_AP1R1_EL2)
+CPUIF_MAP(ICH_AP1R0, ICH_AP1R0_EL2)
+CPUIF_MAP(ICC_HSRE, ICC_SRE_EL2)
+CPUIF_MAP(ICC_SRE, ICC_SRE_EL1)
+
+CPUIF_MAP_LO_HI(ICH_LR15, ICH_LRC15, ICH_LR15_EL2)
+CPUIF_MAP_LO_HI(ICH_LR14, ICH_LRC14, ICH_LR14_EL2)
+CPUIF_MAP_LO_HI(ICH_LR13, ICH_LRC13, ICH_LR13_EL2)
+CPUIF_MAP_LO_HI(ICH_LR12, ICH_LRC12, ICH_LR12_EL2)
+CPUIF_MAP_LO_HI(ICH_LR11, ICH_LRC11, ICH_LR11_EL2)
+CPUIF_MAP_LO_HI(ICH_LR10, ICH_LRC10, ICH_LR10_EL2)
+CPUIF_MAP_LO_HI(ICH_LR9, ICH_LRC9, ICH_LR9_EL2)
+CPUIF_MAP_LO_HI(ICH_LR8, ICH_LRC8, ICH_LR8_EL2)
+CPUIF_MAP_LO_HI(ICH_LR7, ICH_LRC7, ICH_LR7_EL2)
+CPUIF_MAP_LO_HI(ICH_LR6, ICH_LRC6, ICH_LR6_EL2)
+CPUIF_MAP_LO_HI(ICH_LR5, ICH_LRC5, ICH_LR5_EL2)
+CPUIF_MAP_LO_HI(ICH_LR4, ICH_LRC4, ICH_LR4_EL2)
+CPUIF_MAP_LO_HI(ICH_LR3, ICH_LRC3, ICH_LR3_EL2)
+CPUIF_MAP_LO_HI(ICH_LR2, ICH_LRC2, ICH_LR2_EL2)
+CPUIF_MAP_LO_HI(ICH_LR1, ICH_LRC1, ICH_LR1_EL2)
+CPUIF_MAP_LO_HI(ICH_LR0, ICH_LRC0, ICH_LR0_EL2)
+
+#define read_gicreg(r) read_##r()
+#define write_gicreg(v, r) write_##r(v)
+
/* Low-level accessors */
static inline void gic_write_eoir(u32 irq)
diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
index 58faff5..dfccf94 100644
--- a/arch/arm/include/asm/kvm_asm.h
+++ b/arch/arm/include/asm/kvm_asm.h
@@ -68,6 +68,9 @@ 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_hyp.h b/arch/arm/include/asm/kvm_hyp.h
index 0b475d2..ed96cf9 100644
--- a/arch/arm/include/asm/kvm_hyp.h
+++ b/arch/arm/include/asm/kvm_hyp.h
@@ -104,6 +104,9 @@ 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 a2b3eb3..b38c10c 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 10d77a6..043d817f 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -26,8 +26,10 @@ 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 += $(KVM)/arm/arch_timer.o
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index 1bb2b79..10c0244 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -228,6 +228,36 @@ bool access_vm_reg(struct kvm_vcpu *vcpu,
return true;
}
+static bool access_gic_sgi(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ u64 reg;
+
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p);
+
+ reg = *vcpu_reg(vcpu, p->Rt2);
+ reg <<= 32;
+ reg |= *vcpu_reg(vcpu, p->Rt1) ;
+
+ vgic_v3_dispatch_sgi(vcpu, reg);
+
+ return true;
+}
+
+static bool access_gic_sre(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+
+ *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre;
+
+ return true;
+}
+
/*
* We could trap ID_DFR0 and tell the guest we don't support performance
* monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was
@@ -361,10 +391,16 @@ static const struct coproc_reg cp15_regs[] = {
{ CRn(10), CRm( 3), Op1( 0), Op2( 1), is32,
access_vm_reg, reset_unknown, c10_AMAIR1},
+ /* ICC_SGI1R */
+ { CRm64(12), Op1( 0), is64, access_gic_sgi},
+
/* VBAR: swapped by interrupt.S. */
{ CRn(12), CRm( 0), Op1( 0), Op2( 0), is32,
NULL, reset_val, c12_VBAR, 0x00000000 },
+ /* ICC_SRE */
+ { CRn(12), CRm(12), Op1( 0), Op2(5), is32, access_gic_sre },
+
/* CONTEXTIDR/TPIDRURW/TPIDRURO/TPIDRPRW: swapped by interrupt.S. */
{ CRn(13), CRm( 0), Op1( 0), Op2( 1), is32,
access_vm_reg, reset_val, c13_CID, 0x00000000 },
diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile
index 8dfa5f7..3023bb5 100644
--- a/arch/arm/kvm/hyp/Makefile
+++ b/arch/arm/kvm/hyp/Makefile
@@ -5,6 +5,7 @@
KVM=../../../../virt/kvm
obj-$(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 b13caa9..8409dd5 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 <http://www.gnu.org/licenses/>.
*/
+#include <linux/jump_label.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_hyp.h>
@@ -74,14 +75,21 @@ 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_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_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 7ba9164..6eaf12c 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 19b698e..7462138 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -217,7 +217,6 @@ 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 */
@@ -227,7 +226,6 @@ struct vgic_v3_cpu_if {
u32 vgic_ap0r[4];
u32 vgic_ap1r[4];
u64 vgic_lr[VGIC_V3_MAX_LRS];
-#endif
};
struct vgic_cpu {
@@ -294,13 +292,7 @@ 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 f3811b3..4dc026a 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;
@@ -392,8 +388,6 @@ struct kvm_device_ops kvm_arm_vgic_v2_ops = {
/* V3 ops */
-#ifdef CONFIG_KVM_ARM_VGIC_V3
-
static int vgic_v3_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
@@ -436,5 +430,3 @@ 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 3bad3c5..e18b30d 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 80f92ce..4c34d39 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 100045f..9d9e014 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;
--
1.7.9.5
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