【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）
loongarch kvm启动时发生panic
一、缺陷信息

内核信息：
5.10.0.176
缺陷归属组件：
kvm
缺陷归属的版本：
无
缺陷简述：
loongarch架构下启动qemu kvm物理机panic

【环境信息】
硬件信息

• 裸机场景请提供问题的硬件信息
• 虚拟机场景请提供虚拟机的XML文件或配置信息
  软件信息
• OS版本及分支信息
• 内核信息
• 发现问题的组件版本信息
  网络信息
• 如果有特殊组网，请提供网络拓扑信息

【问题复现步骤】，请描述具体的操作步骤
loongarch架构下通过virt-manager启动qemu kvm
【实际结果】，请描述出问题的结果和影响
物理机内核panic
[ 35.513694][ T1594] CPU: 0 PID: 1594 Comm: qemu-kvm Not tainted 5.10.0+ #1
[ 35.520523][ T1594] Hardware name: Loongson Loongson-3A5000-HV-7A2000-1w-V0.1-EVB/Loongson-LS3A5000-7A2000-1w-EVB-V1.21, BIOS Loongson-UDK2018-V4.0.05380-beta10 1
[ 35.534956][ T1594] $ 0 : 0000000000000000 900000000040c6b8 900000010f61c000 900000010f61fc60
[ 35.543606][ T1594] $ 4 : 900000011e3ac758 0000000000000000 900000010f611f00 ffff800002764c28
[ 35.552254][ T1594] $ 8 : 900000010f61fc08 ffffff0001583048 0000000000000080 00000000000d0046
[ 35.560901][ T1594] $12 : ffffffffffffffff 0000000000000001 0000000000000001 0000000000000003
[ 35.569550][ T1594] $16 : 000000000000000f 9000000130603000 00000000000006e6 0000000000000000
[ 35.578198][ T1594] $20 : 9000000158308000 000000aaaef80000 90000000014008c0 900000011e3ad758
[ 35.586845][ T1594] $24 : 900000010f61fcc0 0000000000000001 0000000000000000 9000000000f72000
[ 35.595494][ T1594] $28 : 900000010f610000 0000000000000001 000000aaaef80000 9000000130603000
[ 35.604161][ T1594] era : ffff800002754d88 kvm_mmu_notifier_invalidate_range_end+0x90/0x94 [kvm]
[ 35.613073][ T1594] ra : 900000000040c6b8 __mmu_notifier_invalidate_range_end+0x90/0x128
[ 35.621371][ T1594] CSR crmd: aaaef80000
[ 35.621372][ T1594] CSR prmd: 00000004
[ 35.625350][ T1594] CSR euen: 900000010f610000
[ 35.629154][ T1594] CSR ecfg: 9000000130603000
[ 35.633650][ T1594] CSR estat: 900000011f9e9960
[ 35.642729][ T1594] ExcCode : 1e (SubCode 7e)
[ 35.647053][ T1594] PrId : 0014c011 (Loongson-64bit)
[ 35.652067][ T1594] Modules linked in: xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nft_objref nf_conntrack_tftp tun bridge stp llc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_t
[ 35.726630][ T1594] Process qemu-kvm (pid: 1594, threadinfo=0000000091e50370, task=00000000094710cb)
[ 35.735705][ T1594] Stack : 900000011e3ad758 900000000040c6b8 0000000000000008 900000011f9e9960
[ 35.744354][ T1594] ffffff0001575f00 ffffff0001575f00 900000010f61fd50 90000000003bcf34
[ 35.753001][ T1594] 900000010f61fcc0 fffffffffffffffd ffffffffffffff97 0000000000000001
[ 35.761649][ T1594] 900000011f9e9960 9000000130603000 000000aaaef80000 000000aaaef84000
[ 35.770296][ T1594] 0000000100000001 0000000000000000 900000011e4e9000 000000fffbde1fb0
[ 35.778944][ T1594] 0000000000000001 9000000130603068 0000000000000040 9000000130603000
[ 35.787591][ T1594] 900000010f680050 0000000000000255 900000011f9e9960 900000010f61fd50
[ 35.796239][ T1594] 0000000000000004 90000000003c4b18 900000011f9e9960 00100cca00000255
[ 35.804887][ T1594] 00000000000002e9 000000aaaef80000 900000010f616ab8 900000010f680050
[ 35.813534][ T1594] 40000001575f029d 0000000000000000 ffffff0001575f00 900000010f611f00
[ 35.822182][ T1594] ...
[ 35.825296][ T1594] Call Trace:
[ 35.825302][ T1594] [] kvm_mmu_notifier_invalidate_range_end+0x90/0x94 [kvm]
[ 35.836974][ T1594] [<900000000040c6b8>] __mmu_notifier_invalidate_range_end+0x90/0x128
[ 35.844929][ T1594] [<90000000003bcf34>] wp_page_copy+0x654/0xba4
[ 35.850981][ T1594] [<90000000003c4b18>] __handle_mm_fault+0xfc/0x3a0
[ 35.857380][ T1594] [<90000000003c4eac>] handle_mm_fault+0xf0/0x258
[ 35.863605][ T1594] [<900000000023071c>] __do_page_fault+0x110/0x370
[ 35.869916][ T1594] [<90000000002309cc>] do_page_fault+0x50/0x7c
[ 35.875882][ T1594] [<900000000022fcd8>] tlb_do_page_fault_1+0xf4/0x190
[ 35.882453][ T1594]
[ 35.884616][ T1594] Code: 4c000020 55779000 53ffbbff <002a0001> 02ff0063 29c0c077 29c0e061 29c0a078 29c08079
[ 35.894999][ T1594]
[ 35.897211][ T1594] ---[ end trace 71c7030e5032cbeb ]---
[ 35.902494][ T1594] Kernel panic - not syncing: Fatal exception
[ 35.908383][ T1594] ---[ end Kernel panic - not syncing: Fatal exception ]---

【其他相关附件信息】
比如系统message日志/组件日志、dump信息、图片等

缺陷详情参考链接：

缺陷分析指导链接：
https：xxx
怀疑下面patch的合入导致loongarch物理机panic
commit ID ac63cf0a8e38a3569ab927f34e700d3a0d178336
KVM: Move MMU notifier's mmu_lock acquisition into common helper
loongarch架构使用旧的mmu notifier机制
在kvm_mmu_notifier_invalidate_range_end函数中会对 kvm->mmu_notifier_count--;
但是在kvm_mmu_notifier_invalidate_range_start函数中却没有kvm->mmu_notifier_count++;