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| author | Anup Patel <[email protected]> | 2022-07-22 14:16:24 +0000 |
|---|---|---|
| committer | Anup Patel <[email protected]> | 2023-10-20 11:20:36 +0000 |
| commit | c667ad229d13c41590882a35a8c159387b4e149b (patch) | |
| tree | d2e8edb3b74e0f70dbfddc43946e357ce50a7400 /drivers/cdx/controller/cdx_controller.c | |
| parent | RISC-V: KVM: Allow some SBI extensions to be disabled by default (diff) | |
| download | kernel-c667ad229d13c41590882a35a8c159387b4e149b.tar.gz kernel-c667ad229d13c41590882a35a8c159387b4e149b.zip | |
RISC-V: KVM: Forward SBI DBCN extension to user-space
The frozen SBI v2.0 specification defines the SBI debug console
(DBCN) extension which replaces the legacy SBI v0.1 console
functions namely sbi_console_getchar() and sbi_console_putchar().
The SBI DBCN extension needs to be emulated in the KVM user-space
(i.e. QEMU-KVM or KVMTOOL) so we forward SBI DBCN calls from KVM
guest to the KVM user-space which can then redirect the console
input/output to wherever it wants (e.g. telnet, file, stdio, etc).
The SBI debug console is simply a early console available to KVM
guest for early prints and it does not intend to replace the proper
console devices such as 8250, VirtIO console, etc.
Signed-off-by: Anup Patel <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Signed-off-by: Anup Patel <[email protected]>
Diffstat (limited to 'drivers/cdx/controller/cdx_controller.c')
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