Merge tag 'kvm-arm-for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

KVM/ARM updates for 4.10:

- Support for the GICv3 ITS on 32bit platforms
- A handful of timer and GIC emulation fixes
- A PMU architecture fix

15 files changed, 36 insertions, 63 deletions

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 8a5ebd118313..72a718c1176d 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2201,7 +2201,7 @@ after pausing the vcpu, but before it is resumed.
 4.71 KVM_SIGNAL_MSI
 
 Capability: KVM_CAP_SIGNAL_MSI
-Architectures: x86 arm64
+Architectures: x86 arm arm64
 Type: vm ioctl
 Parameters: struct kvm_msi (in)
 Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error
diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
index b38c10c73579..af05f8e0903e 100644
--- a/arch/arm/include/uapi/asm/kvm.h
+++ b/arch/arm/include/uapi/asm/kvm.h
@@ -87,9 +87,11 @@ struct kvm_regs {
 /* Supported VGICv3 address types  */
 #define KVM_VGIC_V3_ADDR_TYPE_DIST      2
 #define KVM_VGIC_V3_ADDR_TYPE_REDIST    3
+#define KVM_VGIC_ITS_ADDR_TYPE          4
 
 #define KVM_VGIC_V3_DIST_SIZE           SZ_64K
 #define KVM_VGIC_V3_REDIST_SIZE         (2 * SZ_64K)
+#define KVM_VGIC_V3_ITS_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/Kconfig b/arch/arm/kvm/Kconfig
index 3e1cd0452d67..90d0176fb30d 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -34,6 +34,7 @@ config KVM
         select HAVE_KVM_IRQFD
         select HAVE_KVM_IRQCHIP
         select HAVE_KVM_IRQ_ROUTING
+        select HAVE_KVM_MSI
         depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
         ---help---
           Support hosting virtualized guest machines.
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index f19842ea5418..d571243ab4d1 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -32,5 +32,6 @@ 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)/arm/vgic/vgic-its.o
 obj-y += $(KVM)/irqchip.o
 obj-y += $(KVM)/arm/arch_timer.o
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 19b5f5c1c0ff..8f92efa8460e 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -221,6 +221,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
         case KVM_CAP_MAX_VCPUS:
                 r = KVM_MAX_VCPUS;
                 break;
+        case KVM_CAP_MSI_DEVID:
+                if (!kvm)
+                        r = -EINVAL;
+                else
+                        r = kvm->arch.vgic.msis_require_devid;
+                break;
         default:
                 r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
                 break;
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 6eaf12c1d627..52cb7ad9b2fd 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -16,9 +16,6 @@ menuconfig VIRTUALIZATION
 
 if VIRTUALIZATION
 
-config KVM_ARM_VGIC_V3_ITS
-        bool
-
 config KVM
         bool "Kernel-based Virtual Machine (KVM) support"
         depends on OF
@@ -34,7 +31,6 @@ config KVM
         select KVM_VFIO
         select HAVE_KVM_EVENTFD
         select HAVE_KVM_IRQFD
-        select KVM_ARM_VGIC_V3_ITS
         select KVM_ARM_PMU if HW_PERF_EVENTS
         select HAVE_KVM_MSI
         select HAVE_KVM_IRQCHIP
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index 83037cd62d01..0c848c18ca44 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -85,7 +85,13 @@ static void __hyp_text __activate_traps(struct kvm_vcpu *vcpu)
         write_sysreg(val, hcr_el2);
         /* Trap on AArch32 cp15 c15 accesses (EL1 or EL0) */
         write_sysreg(1 << 15, hstr_el2);
-        /* Make sure we trap PMU access from EL0 to EL2 */
+        /*
+         * Make sure we trap PMU access from EL0 to EL2. Also sanitize
+         * PMSELR_EL0 to make sure it never contains the cycle
+         * counter, which could make a PMXEVCNTR_EL0 access UNDEF at
+         * EL1 instead of being trapped to EL2.
+         */
+        write_sysreg(0, pmselr_el0);
         write_sysreg(ARMV8_PMU_USERENR_MASK, pmuserenr_el0);
         write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
         __activate_traps_arch()();
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 5bc460884639..e95d4f68bf54 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -86,12 +86,6 @@ int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
         case KVM_CAP_VCPU_ATTRIBUTES:
                 r = 1;
                 break;
-        case KVM_CAP_MSI_DEVID:
-                if (!kvm)
-                        r = -EINVAL;
-                else
-                        r = kvm->arch.vgic.msis_require_devid;
-                break;
         default:
                 r = 0;
         }
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index b7e34313cdfe..0deea34494e7 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -295,10 +295,10 @@
 #define GITS_BASER_InnerShareable                                       \
         GIC_BASER_SHAREABILITY(GITS_BASER, InnerShareable)
 #define GITS_BASER_PAGE_SIZE_SHIFT      (8)
-#define GITS_BASER_PAGE_SIZE_4K         (0UL << GITS_BASER_PAGE_SIZE_SHIFT)
-#define GITS_BASER_PAGE_SIZE_16K        (1UL << GITS_BASER_PAGE_SIZE_SHIFT)
-#define GITS_BASER_PAGE_SIZE_64K        (2UL << GITS_BASER_PAGE_SIZE_SHIFT)
-#define GITS_BASER_PAGE_SIZE_MASK       (3UL << GITS_BASER_PAGE_SIZE_SHIFT)
+#define GITS_BASER_PAGE_SIZE_4K         (0ULL << GITS_BASER_PAGE_SIZE_SHIFT)
+#define GITS_BASER_PAGE_SIZE_16K        (1ULL << GITS_BASER_PAGE_SIZE_SHIFT)
+#define GITS_BASER_PAGE_SIZE_64K        (2ULL << GITS_BASER_PAGE_SIZE_SHIFT)
+#define GITS_BASER_PAGE_SIZE_MASK       (3ULL << GITS_BASER_PAGE_SIZE_SHIFT)
 #define GITS_BASER_PAGES_MAX            256
 #define GITS_BASER_PAGES_SHIFT          (0)
 #define GITS_BASER_NR_PAGES(r)          (((r) & 0xff) + 1)
diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 27a1f6341d41..ae95fc0e3214 100644
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -425,6 +425,11 @@ int kvm_timer_hyp_init(void)
         info = arch_timer_get_kvm_info();
         timecounter = &info->timecounter;
 
+        if (!timecounter->cc) {
+                kvm_err("kvm_arch_timer: uninitialized timecounter\n");
+                return -ENODEV;
+        }
+
         if (info->virtual_irq <= 0) {
                 kvm_err("kvm_arch_timer: invalid virtual timer IRQ: %d\n",
                         info->virtual_irq);
@@ -498,17 +503,7 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
         if (ret)
                 return ret;
 
-
-        /*
-         * There is a potential race here between VCPUs starting for the first
-         * time, which may be enabling the timer multiple times.  That doesn't
-         * hurt though, because we're just setting a variable to the same
-         * variable that it already was.  The important thing is that all
-         * VCPUs have the enabled variable set, before entering the guest, if
-         * the arch timers are enabled.
-         */
-        if (timecounter)
-                timer->enabled = 1;
+        timer->enabled = 1;
 
         return 0;
 }
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 4660a7d04eea..8c2b3cdcb2c5 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -632,21 +632,22 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, int id)
         int index;
         u64 indirect_ptr;
         gfn_t gfn;
+        int esz = GITS_BASER_ENTRY_SIZE(baser);
 
         if (!(baser & GITS_BASER_INDIRECT)) {
                 phys_addr_t addr;
 
-                if (id >= (l1_tbl_size / GITS_BASER_ENTRY_SIZE(baser)))
+                if (id >= (l1_tbl_size / esz))
                         return false;
 
-                addr = BASER_ADDRESS(baser) + id * GITS_BASER_ENTRY_SIZE(baser);
+                addr = BASER_ADDRESS(baser) + id * esz;
                 gfn = addr >> PAGE_SHIFT;
 
                 return kvm_is_visible_gfn(its->dev->kvm, gfn);
         }
 
         /* calculate and check the index into the 1st level */
-        index = id / (SZ_64K / GITS_BASER_ENTRY_SIZE(baser));
+        index = id / (SZ_64K / esz);
         if (index >= (l1_tbl_size / sizeof(u64)))
                 return false;
 
@@ -670,8 +671,8 @@ static bool vgic_its_check_id(struct vgic_its *its, u64 baser, int id)
         indirect_ptr &= GENMASK_ULL(51, 16);
 
         /* Find the address of the actual entry */
-        index = id % (SZ_64K / GITS_BASER_ENTRY_SIZE(baser));
-        indirect_ptr += index * GITS_BASER_ENTRY_SIZE(baser);
+        index = id % (SZ_64K / esz);
+        indirect_ptr += index * esz;
         gfn = indirect_ptr >> PAGE_SHIFT;
 
         return kvm_is_visible_gfn(its->dev->kvm, gfn);
diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
index ce1f4ed9daf4..fbe87a63d250 100644
--- a/virt/kvm/arm/vgic/vgic-kvm-device.c
+++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
@@ -221,11 +221,9 @@ int kvm_register_vgic_device(unsigned long type)
                 ret = kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
                                               KVM_DEV_TYPE_ARM_VGIC_V3);
 
-#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
                 if (ret)
                         break;
                 ret = kvm_vgic_register_its_device();
-#endif
                 break;
         }
 
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
index b44b359cbbad..78e34bc4d89b 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
@@ -129,6 +129,7 @@ static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
                                    unsigned long val)
 {
         u32 intid = VGIC_ADDR_TO_INTID(addr, 8);
+        u8 cpu_mask = GENMASK(atomic_read(&vcpu->kvm->online_vcpus) - 1, 0);
         int i;
 
         /* GICD_ITARGETSR[0-7] are read-only */
@@ -141,7 +142,7 @@ static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
 
                 spin_lock(&irq->irq_lock);
 
-                irq->targets = (val >> (i * 8)) & 0xff;
+                irq->targets = (val >> (i * 8)) & cpu_mask;
                 target = irq->targets ? __ffs(irq->targets) : 0;
                 irq->target_vcpu = kvm_get_vcpu(vcpu->kvm, target);
 
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index 0d3c76a4208b..50f42f0f8c4f 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -42,7 +42,6 @@ u64 update_64bit_reg(u64 reg, unsigned int offset, unsigned int len,
         return reg | ((u64)val << lower);
 }
 
-#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
 bool vgic_has_its(struct kvm *kvm)
 {
         struct vgic_dist *dist = &kvm->arch.vgic;
@@ -52,7 +51,6 @@ bool vgic_has_its(struct kvm *kvm)
 
         return dist->has_its;
 }
-#endif
 
 static unsigned long vgic_mmio_read_v3_misc(struct kvm_vcpu *vcpu,
                                             gpa_t addr, unsigned int len)
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 9d9e014765a2..859f65c6e056 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -84,37 +84,11 @@ int vgic_v3_probe(const struct gic_kvm_info *info);
 int vgic_v3_map_resources(struct kvm *kvm);
 int vgic_register_redist_iodevs(struct kvm *kvm, gpa_t dist_base_address);
 
-#ifdef CONFIG_KVM_ARM_VGIC_V3_ITS
 int vgic_register_its_iodevs(struct kvm *kvm);
 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);
-#else
-static inline int vgic_register_its_iodevs(struct kvm *kvm)
-{
-        return -ENODEV;
-}
-
-static inline bool vgic_has_its(struct kvm *kvm)
-{
-        return false;
-}
-
-static inline int kvm_vgic_register_its_device(void)
-{
-        return -ENODEV;
-}
-
-static inline void vgic_enable_lpis(struct kvm_vcpu *vcpu)
-{
-}
-
-static inline int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
-{
-        return -ENODEV;
-}
-#endif
 
 int kvm_register_vgic_device(unsigned long type);
 int vgic_lazy_init(struct kvm *kvm);