Add some features to the loongarch kvm

**【标题描述】能够简要描述问题：说明什么场景下，做了什么操作，出现什么问题（尽量使用正向表达方式）**

Add hypercall instruction emulation
增将hypercall 指令仿真，只是增加桩函数，没有实际功能相当于noop指令
Add cpucfg area for kvm hypervisor
增加cpucfg指令仿真的寄存器范围，增加kvm功能寄存器

Add vcpu search support from physical cpuid
增加physical cpuid和vcpu的映射关系，可以通过物理cpuid找到对应的vcpu

Add pv ipi support on kvm side
Add pv ipi support on guest kernel side

Add hypercall for LoongArch
增加hypercall的文档描述

Add software breakpoint support
增加软件断点功能

loongson-eiointc: Add virt extension support
此patch增强了扩展中断的能力，只在虚拟化下使用
Add steal time support in kvm side
Add steal time support in guest side

steal time 和 pv ipi都基于hypercall实现对应的功能，所以这个系列的patch
实现了hypercall指令的仿真的基础机制，在此基础上实现了steal time和pv ipi功能

在编译内核时使能配置选项CONFIG_PARAVIRT=y  即可打开
物理机虚拟机更换最新内核
物理机系统信息如下:
```
[root@localhost ~]# uname -a
Linux localhost.localdomain 6.6.0+ #5 SMP Thu Mar 28 17:22:31 CST 2024 loongarch64 loongarch64 loongarch64 GNU/Linux
[root@localhost ~]# cat /etc/os-release 
NAME="openEuler"
VERSION="22.03 LTS"
ID="openEuler"
VERSION_ID="22.03"
PRETTY_NAME="openEuler 22.03 LTS"
ANSI_COLOR="0;31"

```
虚拟机系统信息如下:
```
[root@fedora ~]# uname -a
Linux fedora 6.6.0+ #5 SMP Thu Mar 28 17:22:31 CST 2024 loongarch64 GNU/Linux
[root@fedora ~]# cat /etc/os-release 
NAME="Fedora Linux"
VERSION="38 (MATE-Compiz Prerelease)"
ID=fedora
VERSION_ID=38
VERSION_CODENAME=""
PLATFORM_ID="platform:f38"
PRETTY_NAME="Fedora Linux 38 (MATE-Compiz Prerelease)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:38"
DEFAULT_HOSTNAME="fedora"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/"
SUPPORT_URL="https://ask.fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=rawhide
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=rawhide
VARIANT="MATE-Compiz"
VARIANT_ID=matecompiz
```

steal time 和 pv ipi验证：
在虚拟机中使用如下命令查看
```
[root@fedora ~]# dmesg |  grep PV
[    0.000013] Using stolen time PV

```
在物理机中使用如下命令查看：
```
[root@localhost build]# cat /sys/kernel/debug/kvm/hypercall_exits 
10831
[root@localhost build]# cat /sys/kernel/debug/kvm/hypercall_exits 
11058
[root@localhost build]# 
```
说明hypercall机制工作正常steal time初始化正常

软件断点功能验证：
虚拟机使用如下命令启动：
```
/usr/bin/qemu-system-loongarch64 \
-name guest=debian11,debug-threads=on \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/loongarch64/QEMU_EFI.fd","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"raw","file":"libvirt-pflash0-storage"}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/debian11_VARS.fd","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"raw","file":"libvirt-pflash1-storage"}' \
-machine virt,usb=off,dump-guest-core=off,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu la464 \
-m size=4194304k \
-smp 2,sockets=2,cores=1,threads=1 \
-nodefaults \
-device '{"driver":"virtio-scsi-pci","id":"scsi0"}' \
-blockdev '{"driver":"file","filename":"/root/share/root/fedora-mate.qcow2","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"qcow2","file":"libvirt-1-storage","backing":null}' \
-device '{"driver":"virtio-blk-pci","drive":"libvirt-1-format","id":"virtio-disk0","bootindex":1}' \
-monitor tcp::4000,server,nowait \
-nographic \
-serial stdio -s
```
物理机中使用
```
[root@archlinux kvm]# gdb vmlinux 
GNU gdb (GDB) 13.1
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "loongarch64-unknown-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from vmlinux...

This GDB supports auto-downloading debuginfo from the following URLs:
  <http://debuginfod.loongarch.zhcn.cc:8002>
Enable debuginfod for this session? (y or [n]) n
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.
(No debugging symbols found in vmlinux)
(gdb) target remote:1234
Remote debugging using :1234
0x9000000002741300 in ?? ()
(gdb) bt
#0  0x9000000002741300 in ?? ()
#1  0x9000000003777208 in ?? ()
(gdb) x/10i 0x9000000002741300
=> 0x9000000002741300:  jirl            $zero, $ra, 0
   0x9000000002741304:  csrwr           $t0, 0x30
   0x9000000002741308:  csrwr           $t1, 0x31
   0x900000000274130c:  csrrd           $t1, 0x1
   0x9000000002741310:  andi            $t1, $t1, 0x3
   0x9000000002741314:  move            $t0, $sp
   0x9000000002741318:  beqz            $t1, 36(0x24)   # 0x900000000274133c
   0x900000000274131c:  lu12i.w         $t1, 14352(0x3810)
   0x9000000002741320:  ori             $t1, $t1, 0x8
   0x9000000002741324:  lu32i.d         $t1, 0
(gdb) info registers 
r0             0x0                 0
r1             0x9000000003777208  0x9000000003777208
r2             0x9000000003c94000  0x9000000003c94000
r3             0x9000000003c97dc0  0x9000000003c97dc0
r4             0x5                 5
r5             0xb0                176
r6             0x1                 1
r7             0x7fffffffffffffff  9223372036854775807
r8             0x90000001001d3d70  10376293545758506352
r9             0x9000000003822b10  10376293541520485136
r10            0x4                 4
r11            0x9000000100208880  10376293545758722176
r12            0x0                 0
r13            0x28f4              10484
r14            0x0                 0
r15            0x1                 1
r16            0x4000000000000000  4611686018427387904
r17            0xfa71ede2          4201770466
r18            0x0                 0
r19            0x0                 0
r20            0x0                 0
r21            0x7c7f0000          2088697856
r22            0xe018330           0xe018330
r23            0x4                 4
r24            0x9000000003cc2f68  10376293541525335912
r25            0x4                 4
r26            0x0                 0
r27            0x9000000003cc3000  10376293541525336064
r28            0x90000000037f0108  10376293541520277768
r29            0x90000000037f0108  10376293541520277768
r30            0x0                 0
--Type <RET> for more, q to quit, c to continue without paging--   
r31            0xea09d18           245407000
orig_a0        0x0                 0
pc             0x9000000002741300  0x9000000002741300
badv           0x7fffec1a4190      0x7fffec1a4190
f0             {f = 0x65656500, d = 0x65656500} {f = 6.77053154e+22, d = 8.4047671416835751e-315}
f1             {f = 0x65656500, d = 0x65656500} {f = 6.77053154e+22, d = 8.4047671416835751e-315}
f2             {f = 0x3020100, d = 0x3020100} {f = 3.82047143e-37, d = 2.4932022828511324e-316}
f3             {f = 0x2079726f, d = 0x2079726f} {f = 2.11289833e-19, d = 2.6918181694982204e-315}
f4             {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f5             {f = 0xa, d = 0xa}  {f = 1.40129846e-44, d = 4.9406564584124654e-323}
f6             {f = 0x100f0e0d, d = 0x100f0e0d} {f = 2.82126017e-29, d = 1.3311220038194539e-315}
f7             {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f8             {f = 0x62616e75, d = 0x62616e75} {f = 1.03961917e+21, d = 8.154812557812484e-315}
f9             {f = 0x4e203a74, d = 0x4e203a74} {f = 672046336, d = 6.4758911651536304e-315}
f10            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f11            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f12            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f13            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f14            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f15            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f16            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f17            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f18            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f19            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f20            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f21            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f22            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f23            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f24            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f25            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f26            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
--Type <RET> for more, q to quit, c to continue without paging--
f27            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f28            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f29            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f30            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
f31            {f = 0xffffffff, d = 0xffffffff} {f = -nan(0x7fffff), d = 2.1219957904712067e-314}
fcc0           0x1                 1
fcc1           0x0                 0
fcc2           0x0                 0
fcc3           0x0                 0
fcc4           0x0                 0
fcc5           0x0                 0
fcc6           0x0                 0
fcc7           0x0                 0
fcsr           0x1010000           16842752
(gdb)

```

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