The KVM host kernel is running in HS-mode needs so we need to handle the SBI calls coming from guest kernel running in VS-mode. This patch adds SBI v0.1 support in KVM RISC-V. Almost all SBI v0.1 calls are implemented in KVM kernel module except GETCHAR and PUTCHART calls which are forwarded to user space because these calls cannot be implemented in kernel space. In future, when we implement SBI v0.2 for Guest, we will forward SBI v0.2 experimental and vendor extension calls to user space.
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| @@ -269,6 +269,7 @@ struct kvm_xen_exit { · 268 unmodified lines | ||
| 269 | 269 | #define KVM_EXIT_AP_RESET_HOLD 32 |
| 270 | 270 | #define KVM_EXIT_X86_BUS_LOCK 33 |
| 271 | 271 | #define KVM_EXIT_XEN 34 |
| 272 | +#define KVM_EXIT_RISCV_SBI 35 | |
| 272 | 273 | |
| 273 | 274 | /* For KVM_EXIT_INTERNAL_ERROR */ |
| 274 | 275 | /* Emulate instruction failed. */ |
| @@ -469,6 +470,13 @@ struct kvm_run { · 194 unmodified lines | ||
| 469 | 470 | } msr; |
| 470 | 471 | /* KVM_EXIT_XEN */ |
| 471 | 472 | struct kvm_xen_exit xen; |
| 473 | + /* KVM_EXIT_RISCV_SBI */ | |
| 474 | + struct { | |
| 475 | + unsigned long extension_id; | |
| 476 | + unsigned long function_id; | |
| 477 | + unsigned long args[6]; | |
| 478 | + unsigned long ret[2]; | |
| 479 | + } riscv_sbi; | |
| 472 | 480 | /* Fix the size of the union. */ |
| 473 | 481 | char padding[256]; |
| 474 | 482 | }; |