Documentation: kvm: replace section numbers with links

In order to simplify further introduction of hyperlinks, replace explicit
section numbers with rST hyperlinks.  The section numbers could actually
be removed now, but I'm not going to do a huge change throughout the file
for an RFC...

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241023124507.280382-4-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Documentation/virt/kvm/api.rst

@@ -96,9 +96,9 @@ description:
   Capability:
       which KVM extension provides this ioctl.  Can be 'basic',
       which means that is will be provided by any kernel that supports
-      API version 12 (see section 4.1), or a KVM_CAP_xyz constant, which
-      means availability needs to be checked with KVM_CHECK_EXTENSION
-      (see section 4.4).
+      API version 12 (see :ref:`KVM_GET_API_VERSION <KVM_GET_API_VERSION>`),
+      or a KVM_CAP_xyz constant that can be checked with
+      :ref:`KVM_CHECK_EXTENSION <KVM_CHECK_EXTENSION>`.
 
   Architectures:
       which instruction set architectures provide this ioctl.
@@ -115,6 +115,8 @@ description:
       are not detailed, but errors with specific meanings are.
 
 
+.. _KVM_GET_API_VERSION:
+
 4.1 KVM_GET_API_VERSION
 -----------------------
 
@@ -243,6 +245,8 @@ This list also varies by kvm version and host processor, but does not change
 otherwise.
 
 
+.. _KVM_CHECK_EXTENSION:
+
 4.4 KVM_CHECK_EXTENSION
 -----------------------
 
@@ -285,7 +289,7 @@ the VCPU file descriptor can be mmap-ed, including:
 
 - if KVM_CAP_DIRTY_LOG_RING is available, a number of pages at
   KVM_DIRTY_LOG_PAGE_OFFSET * PAGE_SIZE.  For more information on
-  KVM_CAP_DIRTY_LOG_RING, see section 8.3.
+  KVM_CAP_DIRTY_LOG_RING, see :ref:`KVM_CAP_DIRTY_LOG_RING`.
 
 
 4.7 KVM_CREATE_VCPU
@@ -1426,6 +1430,8 @@ because of a quirk in the virtualization implementation (see the internals
 documentation when it pops into existence).
 
 
+.. _KVM_ENABLE_CAP:
+
 4.37 KVM_ENABLE_CAP
 -------------------
 
@@ -2563,7 +2569,7 @@ Specifically:
 ======================= ========= ===== =======================================
 
 .. [1] These encodings are not accepted for SVE-enabled vcpus.  See
-       KVM_ARM_VCPU_INIT.
+       :ref:`KVM_ARM_VCPU_INIT`.
 
        The equivalent register content can be accessed via bits [127:0] of
        the corresponding SVE Zn registers instead for vcpus that have SVE
@@ -5075,8 +5081,8 @@ Recognised values for feature:
 Finalizes the configuration of the specified vcpu feature.
 
 The vcpu must already have been initialised, enabling the affected feature, by
-means of a successful KVM_ARM_VCPU_INIT call with the appropriate flag set in
-features[].
+means of a successful :ref:`KVM_ARM_VCPU_INIT <KVM_ARM_VCPU_INIT>` call with the
+appropriate flag set in features[].
 
 For affected vcpu features, this is a mandatory step that must be performed
 before the vcpu is fully usable.
@@ -6425,6 +6431,8 @@ the capability to be present.
 `flags` must currently be zero.
 
 
+.. _kvm_run:
+
 5. The kvm_run structure
 ========================
 
@@ -7144,11 +7152,15 @@ primary storage for certain register types. Therefore, the kernel may use the
 values in kvm_run even if the corresponding bit in kvm_dirty_regs is not set.
 
 
+.. _cap_enable:
+
 6. Capabilities that can be enabled on vCPUs
 ============================================
 
 There are certain capabilities that change the behavior of the virtual CPU or
-the virtual machine when enabled. To enable them, please see section 4.37.
+the virtual machine when enabled. To enable them, please see
+:ref:`KVM_ENABLE_CAP`.
+
 Below you can find a list of capabilities and what their effect on the vCPU or
 the virtual machine is when enabling them.
 
@@ -7357,7 +7369,7 @@ KVM API and also from the guest.
           sets are supported
           (bitfields defined in arch/x86/include/uapi/asm/kvm.h).
 
-As described above in the kvm_sync_regs struct info in section 5 (kvm_run):
+As described above in the kvm_sync_regs struct info in section :ref:`kvm_run`,
 KVM_CAP_SYNC_REGS "allow[s] userspace to access certain guest registers
 without having to call SET/GET_*REGS". This reduces overhead by eliminating
 repeated ioctl calls for setting and/or getting register values. This is
@@ -7403,13 +7415,15 @@ Unused bitfields in the bitarrays must be set to zero.
 
 This capability connects the vcpu to an in-kernel XIVE device.
 
+.. _cap_enable_vm:
+
 7. Capabilities that can be enabled on VMs
 ==========================================
 
 There are certain capabilities that change the behavior of the virtual
-machine when enabled. To enable them, please see section 4.37. Below
-you can find a list of capabilities and what their effect on the VM
-is when enabling them.
+machine when enabled. To enable them, please see section
+:ref:`KVM_ENABLE_CAP`. Below you can find a list of capabilities and
+what their effect on the VM is when enabling them.
 
 The following information is provided along with the description:
 
@@ -8570,6 +8584,8 @@ guest according to the bits in the KVM_CPUID_FEATURES CPUID leaf
 (0x40000001). Otherwise, a guest may use the paravirtual features
 regardless of what has actually been exposed through the CPUID leaf.
 
+.. _KVM_CAP_DIRTY_LOG_RING:
+
 8.29 KVM_CAP_DIRTY_LOG_RING/KVM_CAP_DIRTY_LOG_RING_ACQ_REL
 ----------------------------------------------------------