【Backport】KVM 支持 SBI FWFT 扩展优化

[uestc-gr]

这一批补丁集中在 RISC-V KVM 的 SBI FWFT 扩展与 ONE_REG 接口支持，涵盖了功能修复、接口实现、自测增强以及特性管理。通过这些改动，KVM 在 RISC-V 平台上实现了更完善的 固件特性控制，提升了 用户态可控性、测试覆盖率 和 性能优化。

主要包括：

具体如下：

新增 KVM MPXY 扩展支持及相关测试；
增加 kvm FWFT 相关支持与测试；
扩展 get-reg-list 对 ISA 和 SBI 扩展的测试覆盖；
重构 SBI/ISA 扩展测试框架及相关实现；
优化异常检查和寄存器处理逻辑；
修复并清理若干测试代码问题。
整体提升了 RISC-V KVM 对 ISA/SBI 扩展暴露、配置及管理功能的验证能力，具体测试结果如下

这些改动将使 RISC-V KVM 在 功能一致性、可测试性 和 性能优化方面更进一步，为后续扩展和用户态工具支持打下基础。补丁列表如下

4d554e0 KVM: riscv: selftests: Add senvcfg register to get-reg-list test
e1a8db0 KVM: riscv: selftests: Add smstateen registers to get-reg-list test
2b3f2b7 KVM: riscv: selftests: Add condops extensions to get-reg-list test
3279f52 KVM: riscv: selftests: Fix get-reg-list print_reg defaults
7602730 KVM: riscv: selftests: Drop SBI multi registers
b26e70d KVM: riscv: selftests: Use register subtypes
bdf6aa3 RISC-V: KVM: selftests: Treat SBI ext regs like ISA ext regs
ac39614 KVM: riscv: selftests: Add Zbc extension to get-reg-list test
14d70de KVM: riscv: selftests: Add scaler crypto extensions to get-reg-list test
2ddf790 KVM: riscv: selftests: Add vector crypto extensions to get-reg-list test
496ee21 KVM: riscv: selftests: Add Zfh[min] extensions to get-reg-list test
1a3bc50 KVM: riscv: selftests: Add Zihintntl extension to get-reg-list test
1216fdd KVM: riscv: selftests: Add Zvfh[min] extensions to get-reg-list test
4d0e8f9 KVM: riscv: selftests: Add Zfa extension to get-reg-list test
250e138 KVM: selftests: Remove redundant newlines
KVM: riscv: selftests: complete backport for change vcpu_has_ext
d9bb4ec KVM: riscv: selftests: Add Ztso extension to get-reg-list test
d8c0831 KVM: riscv: selftests: Add Zacas extension to get-reg-list test
ca54464 KVM: riscv: selftests: Add Zimop extension to get-reg-list test
d27c34a KVM: riscv: selftests: Add some Zc* extensions to get-reg-list test
e212d92 KVM: riscv: selftests: Add Zcmop extension to get-reg-list test
f2c43c6 KVM: riscv: selftests: Add Zawrs extension to get-reg-list test
dd4a799 KVM: riscv: selftests: Fix compile error
c74bfe4 KVM: riscv: selftests: Add Svade and Svadu Extension to get-reg-list test
144dfe4 KVM: riscv: selftests: Add Svvptc/Zabha/Ziccrse exts to get-reg-list test
7a9827e KVM: riscv: selftests: Add Zaamo/Zalrsc extensions to get-reg-list test
f80e9cc KVM: riscv: selftests: Add vector extension tests
b4ab605 KVM: riscv: selftests: Add bfloat16 extension to get-reg-list test
7826c8f RISC-V: KVM: Fix inclusion of Smnpm in the guest ISA bitmap
6f576fc RISC-V: KVM: Add support for SBI_FWFT_POINTER_MASKING_PMLEN
83df1d6 RISC-V: KVM: Set initial value of hedeleg in kvm_arch_vcpu_create()
a6250b1 RISC-V: KVM: Introduce feature specific reset for SBI FWFT
699a53a RISC-V: KVM: Introduce optional ONE_REG callbacks for SBI extensions
85e7850 RISC-V: KVM: Move copy_sbi_ext_reg_indices() to SBI implementation
48d6710 RISC-V: KVM: Implement ONE_REG interface for SBI FWFT state
5c6d333 KVM: riscv: selftests: Add SBI FWFT to get-reg-list test
e2f3e2d RISC-V: KVM: Convert kvm_riscv_vcpu_sbi_forward() into extension handler
12fd6c6 RISC-V: KVM: Add separate source for forwarded SBI extensions
7050f1d RISC-V: KVM: Add SBI MPXY extension support for Guest
d1c5620 KVM: riscv: selftests: Add SBI MPXY extension to get-reg-list
671995f RISC-V: KVM: selftests: Add Zalasr extensions to get-reg-list test
63224b0 KVM: RISC-V: SBI FWFT: Mark vCPU CSRs dirty after setting feature value
86957e5 KVM: RISC-V: SBI FWFT: Add optional init() callback for hardware probing
e659112 KVM: RISC-V: SBI FWFT: Fix stale feature exposure after runtime extension changes
09bb926 KVM: selftests: Return a value from vcpu_get_reg() instead of using an out-param
e23bb06 KVM: riscv: selftests: Align the trap information wiht pt_regs
3608b17 KVM: riscv: selftests: Decode stval to identify exact exception type
85fc710 KVM: riscv: selftests: Refactor ISA and SBI extension sublist macros
64e50ab KVM: riscv: selftests: Split SBI FWFT into separate feature-specific sublists