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target/riscv: fix SBI getchar handler for KVM 

Character must be returned via ret[0] field (copied to a0 by KVM).

Return value should be set to 0 to indicate successful processing.

Signed-off-by: Vladimir Isaev <vladimir.isaev@syntacore.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230203135155.12449-1-vladimir.isaev@syntacore.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Vladimir Isaev 2023-02-03 16:51:55 +03:00 committed by Alistair Francis
parent 5fc0fc8788
commit 947bf7fe9f
1 changed files with 3 additions and 2 deletions
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5
target/riscv/kvm.c
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@ -467,10 +467,11 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
case SBI_EXT_0_1_CONSOLE_GETCHAR:
ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
if (ret == sizeof(ch)) {
run->riscv_sbi.args[0] = ch;
run->riscv_sbi.ret[0] = ch;
} else {
run->riscv_sbi.args[0] = -1;
run->riscv_sbi.ret[0] = -1;
}
ret = 0;
break;
default:
qemu_log_mask(LOG_UNIMP,