KVM: arm/arm64: rework MMIO abort handling to use KVM MMIO bus

Currently we have struct kvm_exit_mmio for encapsulating MMIO abort
data to be passed on from syndrome decoding all the way down to the
VGIC register handlers. Now as we switch the MMIO handling to be
routed through the KVM MMIO bus, it does not make sense anymore to
use that structure already from the beginning. So we keep the data in
local variables until we put them into the kvm_io_bus framework.
Then we fill kvm_exit_mmio in the VGIC only, making it a VGIC private
structure. On that way we replace the data buffer in that structure
with a pointer pointing to a single location in a local variable, so
we get rid of some copying on the way.
With all of the virtual GIC emulation code now being registered with
the kvm_io_bus, we can remove all of the old MMIO handling code and
its dispatching functionality.

I didn't bother to rename kvm_exit_mmio (to vgic_mmio or something),
because that touches a lot of code lines without any good reason.

This is based on an original patch by Nikolay.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Cc: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

4 files changed, 18 insertions, 144 deletions

diff --git a/virt/kvm/arm/vgic-v2-emul.c b/virt/kvm/arm/vgic-v2-emul.c
index 7460b376d090..13907970d11c 100644
--- a/virt/kvm/arm/vgic-v2-emul.c
+++ b/virt/kvm/arm/vgic-v2-emul.c
@@ -404,24 +404,6 @@ static const struct vgic_io_range vgic_dist_ranges[] = {
         {}
 };
 
-static bool vgic_v2_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
-                                struct kvm_exit_mmio *mmio)
-{
-        unsigned long base = vcpu->kvm->arch.vgic.vgic_dist_base;
-
-        if (!is_in_range(mmio->phys_addr, mmio->len, base,
-                         KVM_VGIC_V2_DIST_SIZE))
-                return false;
-
-        /* GICv2 does not support accesses wider than 32 bits */
-        if (mmio->len > 4) {
-                kvm_inject_dabt(vcpu, mmio->phys_addr);
-                return true;
-        }
-
-        return vgic_handle_mmio_range(vcpu, run, mmio, vgic_dist_ranges, base);
-}
-
 static void vgic_dispatch_sgi(struct kvm_vcpu *vcpu, u32 reg)
 {
         struct kvm *kvm = vcpu->kvm;
@@ -580,7 +562,6 @@ void vgic_v2_init_emulation(struct kvm *kvm)
 {
         struct vgic_dist *dist = &kvm->arch.vgic;
 
-        dist->vm_ops.handle_mmio = vgic_v2_handle_mmio;
         dist->vm_ops.queue_sgi = vgic_v2_queue_sgi;
         dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
         dist->vm_ops.init_model = vgic_v2_init_model;
@@ -690,6 +671,7 @@ static int vgic_attr_regs_access(struct kvm_device *dev,
         struct kvm_vcpu *vcpu, *tmp_vcpu;
         struct vgic_dist *vgic;
         struct kvm_exit_mmio mmio;
+        u32 data;
 
         offset = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
         cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
@@ -711,6 +693,7 @@ static int vgic_attr_regs_access(struct kvm_device *dev,
 
         mmio.len = 4;
         mmio.is_write = is_write;
+        mmio.data = &data;
         if (is_write)
                 mmio_data_write(&mmio, ~0, *reg);
         switch (attr->group) {
diff --git a/virt/kvm/arm/vgic-v3-emul.c b/virt/kvm/arm/vgic-v3-emul.c
index eb1a797cb9c1..e9c3a7a83833 100644
--- a/virt/kvm/arm/vgic-v3-emul.c
+++ b/virt/kvm/arm/vgic-v3-emul.c
@@ -708,40 +708,6 @@ static const struct vgic_io_range vgic_redist_ranges[] = {
         {},
 };
 
-/*
- * This function splits accesses between the distributor and the two
- * redistributor parts (private/SPI). As each redistributor is accessible
- * from any CPU, we have to determine the affected VCPU by taking the faulting
- * address into account. We then pass this VCPU to the handler function via
- * the private parameter.
- */
-#define SGI_BASE_OFFSET SZ_64K
-static bool vgic_v3_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
-                                struct kvm_exit_mmio *mmio)
-{
-        struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
-        unsigned long dbase = dist->vgic_dist_base;
-        unsigned long rdbase = dist->vgic_redist_base;
-        int nrcpus = atomic_read(&vcpu->kvm->online_vcpus);
-        int vcpu_id;
-
-        if (is_in_range(mmio->phys_addr, mmio->len, dbase, GIC_V3_DIST_SIZE)) {
-                return vgic_handle_mmio_range(vcpu, run, mmio,
-                                              vgic_v3_dist_ranges, dbase);
-        }
-
-        if (!is_in_range(mmio->phys_addr, mmio->len, rdbase,
-            GIC_V3_REDIST_SIZE * nrcpus))
-                return false;
-
-        vcpu_id = (mmio->phys_addr - rdbase) / GIC_V3_REDIST_SIZE;
-        rdbase += (vcpu_id * GIC_V3_REDIST_SIZE);
-        mmio->private = kvm_get_vcpu(vcpu->kvm, vcpu_id);
-
-        return vgic_handle_mmio_range(vcpu, run, mmio, vgic_redist_ranges,
-                                      rdbase);
-}
-
 static bool vgic_v3_queue_sgi(struct kvm_vcpu *vcpu, int irq)
 {
         if (vgic_queue_irq(vcpu, 0, irq)) {
@@ -861,7 +827,6 @@ void vgic_v3_init_emulation(struct kvm *kvm)
 {
         struct vgic_dist *dist = &kvm->arch.vgic;
 
-        dist->vm_ops.handle_mmio = vgic_v3_handle_mmio;
         dist->vm_ops.queue_sgi = vgic_v3_queue_sgi;
         dist->vm_ops.add_sgi_source = vgic_v3_add_sgi_source;
         dist->vm_ops.init_model = vgic_v3_init_model;
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index e968179e592f..b70174e74868 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -758,7 +758,6 @@ static bool call_range_handler(struct kvm_vcpu *vcpu,
                                unsigned long offset,
                                const struct vgic_io_range *range)
 {
-        u32 *data32 = (void *)mmio->data;
         struct kvm_exit_mmio mmio32;
         bool ret;
 
@@ -775,70 +774,17 @@ static bool call_range_handler(struct kvm_vcpu *vcpu,
         mmio32.private = mmio->private;
 
         mmio32.phys_addr = mmio->phys_addr + 4;
-        if (mmio->is_write)
-                *(u32 *)mmio32.data = data32[1];
+        mmio32.data = &((u32 *)mmio->data)[1];
         ret = range->handle_mmio(vcpu, &mmio32, offset + 4);
-        if (!mmio->is_write)
-                data32[1] = *(u32 *)mmio32.data;
 
         mmio32.phys_addr = mmio->phys_addr;
-        if (mmio->is_write)
-                *(u32 *)mmio32.data = data32[0];
+        mmio32.data = &((u32 *)mmio->data)[0];
         ret |= range->handle_mmio(vcpu, &mmio32, offset);
-        if (!mmio->is_write)
-                data32[0] = *(u32 *)mmio32.data;
 
         return ret;
 }
 
 /**
- * vgic_handle_mmio_range - handle an in-kernel MMIO access
- * @vcpu:       pointer to the vcpu performing the access
- * @run:        pointer to the kvm_run structure
- * @mmio:       pointer to the data describing the access
- * @ranges:     array of MMIO ranges in a given region
- * @mmio_base:  base address of that region
- *
- * returns true if the MMIO access could be performed
- */
-bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
-                            struct kvm_exit_mmio *mmio,
-                            const struct vgic_io_range *ranges,
-                            unsigned long mmio_base)
-{
-        const struct vgic_io_range *range;
-        struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
-        bool updated_state;
-        unsigned long offset;
-
-        offset = mmio->phys_addr - mmio_base;
-        range = vgic_find_range(ranges, mmio->len, offset);
-        if (unlikely(!range || !range->handle_mmio)) {
-                pr_warn("Unhandled access %d %08llx %d\n",
-                        mmio->is_write, mmio->phys_addr, mmio->len);
-                return false;
-        }
-
-        spin_lock(&vcpu->kvm->arch.vgic.lock);
-        offset -= range->base;
-        if (vgic_validate_access(dist, range, offset)) {
-                updated_state = call_range_handler(vcpu, mmio, offset, range);
-        } else {
-                if (!mmio->is_write)
-                        memset(mmio->data, 0, mmio->len);
-                updated_state = false;
-        }
-        spin_unlock(&vcpu->kvm->arch.vgic.lock);
-        kvm_prepare_mmio(run, mmio);
-        kvm_handle_mmio_return(vcpu, run);
-
-        if (updated_state)
-                vgic_kick_vcpus(vcpu->kvm);
-
-        return true;
-}
-
-/**
  * vgic_handle_mmio_access - handle an in-kernel MMIO access
  * This is called by the read/write KVM IO device wrappers below.
  * @vcpu:       pointer to the vcpu performing the access
@@ -873,23 +819,24 @@ static int vgic_handle_mmio_access(struct kvm_vcpu *vcpu,
         mmio.phys_addr = addr;
         mmio.len = len;
         mmio.is_write = is_write;
-        if (is_write)
-                memcpy(mmio.data, val, len);
+        mmio.data = val;
         mmio.private = iodev->redist_vcpu;
 
         spin_lock(&dist->lock);
         offset -= range->base;
         if (vgic_validate_access(dist, range, offset)) {
                 updated_state = call_range_handler(vcpu, &mmio, offset, range);
-                if (!is_write)
-                        memcpy(val, mmio.data, len);
         } else {
                 if (!is_write)
                         memset(val, 0, len);
                 updated_state = false;
         }
         spin_unlock(&dist->lock);
-        kvm_prepare_mmio(run, &mmio);
+        run->mmio.is_write      = is_write;
+        run->mmio.len           = len;
+        run->mmio.phys_addr     = addr;
+        memcpy(run->mmio.data, val, len);
+
         kvm_handle_mmio_return(vcpu, run);
 
         if (updated_state)
@@ -898,30 +845,6 @@ static int vgic_handle_mmio_access(struct kvm_vcpu *vcpu,
         return 0;
 }
 
-/**
- * vgic_handle_mmio - handle an in-kernel MMIO access for the GIC emulation
- * @vcpu:      pointer to the vcpu performing the access
- * @run:       pointer to the kvm_run structure
- * @mmio:      pointer to the data describing the access
- *
- * returns true if the MMIO access has been performed in kernel space,
- * and false if it needs to be emulated in user space.
- * Calls the actual handling routine for the selected VGIC model.
- */
-bool vgic_handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *run,
-                      struct kvm_exit_mmio *mmio)
-{
-        if (!irqchip_in_kernel(vcpu->kvm))
-                return false;
-
-        /*
-         * This will currently call either vgic_v2_handle_mmio() or
-         * vgic_v3_handle_mmio(), which in turn will call
-         * vgic_handle_mmio_range() defined above.
-         */
-        return vcpu->kvm->arch.vgic.vm_ops.handle_mmio(vcpu, run, mmio);
-}
-
 static int vgic_handle_mmio_read(struct kvm_vcpu *vcpu,
                                  struct kvm_io_device *this,
                                  gpa_t addr, int len, void *val)
diff --git a/virt/kvm/arm/vgic.h b/virt/kvm/arm/vgic.h
index 28fa3aaf6367..0df74cbb6200 100644
--- a/virt/kvm/arm/vgic.h
+++ b/virt/kvm/arm/vgic.h
@@ -59,6 +59,14 @@ void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
 bool vgic_queue_irq(struct kvm_vcpu *vcpu, u8 sgi_source_id, int irq);
 void vgic_unqueue_irqs(struct kvm_vcpu *vcpu);
 
+struct kvm_exit_mmio {
+        phys_addr_t     phys_addr;
+        void            *data;
+        u32             len;
+        bool            is_write;
+        void            *private;
+};
+
 void vgic_reg_access(struct kvm_exit_mmio *mmio, u32 *reg,
                      phys_addr_t offset, int mode);
 bool handle_mmio_raz_wi(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio,
@@ -99,11 +107,6 @@ const
 struct vgic_io_range *vgic_find_range(const struct vgic_io_range *ranges,
                                       int len, gpa_t offset);
 
-bool vgic_handle_mmio_range(struct kvm_vcpu *vcpu, struct kvm_run *run,
-                            struct kvm_exit_mmio *mmio,
-                            const struct vgic_io_range *ranges,
-                            unsigned long mmio_base);
-
 bool vgic_handle_enable_reg(struct kvm *kvm, struct kvm_exit_mmio *mmio,
                             phys_addr_t offset, int vcpu_id, int access);