On Thu, 2025-02-27 at 09:55 +0000, Peter Maydell wrote: > On Thu, 27 Feb 2025 at 05:44, Yanfeng Liu <yfliu2...@qq.com> wrote: > > I am wondering QEMU semihosting for ARM or RISCV targets allows user to > > control > > the set of functions available in semihosting? for example, I want give > > read- > > only host folder share and poweroff functions to a guest. Is this possible? > > No, these are not things that the semihosting ABI includes. > Semihosting does allow the guest to read and write *any* > file on the host, so you mustn't give it to an untrusted > guest. And there's no poweroff function in semihosting. > (There is a SYS_EXIT, but this will exit the whole of QEMU > in a pretty abrupt way; it's not like a powerdown.) > > The semihosting ABI is provision of a specific set of > functions defined in an external specification; it's not > something that we created in QEMU. The main aim of > semihosting is for debugging, especially debugging of > standalone or lowlevel guest code. It's not intended > or ever going to be something for providing arbitrary > VM services to a full-featured guest OS. > > -- PMM Thanks for the clarification.
Regards, yf
