This will let the guest create a memory mapping to expose the XIVE
MMIO region (TIMA) used for interrupt management at the CPU level.
Signed-off-by: Cédric Le Goater <clg@xxxxxxxx>
---
arch/powerpc/include/uapi/asm/kvm.h | 1 +
arch/powerpc/kvm/book3s_xive_native.c | 49 +++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
index cf54fad1faf6..c564ee892cac 100644
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -677,6 +677,7 @@ struct kvm_ppc_cpu_char {
#define KVM_DEV_XIVE_GRP_SOURCES 1 /* 64-bit source attributes */
#define KVM_DEV_XIVE_GRP_CTRL 2
#define KVM_DEV_XIVE_GET_ESB_FD 1
+#define KVM_DEV_XIVE_GET_TIMA_FD 2
/* Layout of 64-bit XIVE source attribute values */
#define KVM_XIVE_LEVEL_SENSITIVE (1ULL << 0)
diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c
index 395298c5fca8..cfce8ba327ca 100644
--- a/arch/powerpc/kvm/book3s_xive_native.c
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -321,6 +321,52 @@ static int kvmppc_xive_native_get_esb_fd(struct kvmppc_xive *xive, u64 addr)
return put_user(ret, ubufp);
}
+static int xive_native_tima_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+
+ if (vmf->pgoff)
+ return VM_FAULT_SIGBUS;
+
+ vm_insert_pfn(vma, vmf->address, (unsigned long)
+ local_paca->kvm_hstate.xive_tima_phys >> PAGE_SHIFT);
+ return VM_FAULT_NOPAGE;
+}
+
+static const struct vm_operations_struct xive_native_tima_vmops = {
+ .fault = xive_native_tima_fault,
+};
+
+static int xive_native_tima_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ unsigned long len = vma->vm_end - vma->vm_start;
+
+ if (len != (1 << PAGE_SHIFT))
+ return -EINVAL;
+
+ vma->vm_flags |= VM_IO | VM_PFNMAP;
+ vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
+ vma->vm_ops = &xive_native_tima_vmops;
+ return 0;
+}
+
+static const struct file_operations xive_native_tima_fops = {
+ .mmap = xive_native_tima_mmap,
+};
+
+static int kvmppc_xive_native_get_tima_fd(struct kvmppc_xive *xive, u64 addr)
+{
+ u64 __user *ubufp = (u64 __user *) addr;
+ int ret;
+
+ ret = anon_inode_getfd("tima", &xive_native_tima_fops, xive,
+ O_RDWR | O_CLOEXEC);
+ if (ret < 0)
+ return ret;
+
+ return put_user(ret, ubufp);
+}
+
static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
@@ -344,6 +390,8 @@ static int kvmppc_xive_native_get_attr(struct kvm_device *dev,
switch (attr->attr) {
case KVM_DEV_XIVE_GET_ESB_FD:
return kvmppc_xive_native_get_esb_fd(xive, attr->addr);
+ case KVM_DEV_XIVE_GET_TIMA_FD:
+ return kvmppc_xive_native_get_tima_fd(xive, attr->addr);
}
break;
}
@@ -362,6 +410,7 @@ static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
case KVM_DEV_XIVE_GRP_CTRL:
switch (attr->attr) {
case KVM_DEV_XIVE_GET_ESB_FD:
+ case KVM_DEV_XIVE_GET_TIMA_FD:
return 0;
}
break;
--
2.13.6
