[PATCH 1/6] RISC-V: KVM: return ENOENT in *_one_reg() when reg is unknown

[Andreas Schwab]

On Jul 31 2023, Daniel Henrique Barboza wrote:

> Existing userspaces can be affected by this error code change. We
> checked a few. As of current upstream code, crosvm doesn't check for any
> particular errno code when using kvm_(get|set)_one_reg(). Neither does
> QEMU.

That may break qemu:

$ qemu-system-riscv64 -cpu rv64 -machine virt,accel=kvm      
qemu-system-riscv64: Unable to read ISA_EXT KVM register ssaia, error -1

-- 
Andreas Schwab, SUSE Labs, schwab at suse.de
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