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LoongArch: KVM: Add sign extension with kernel IOCSR read emulation

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Function kvm_complete_iocsr_read() is to add sign extension with IOCSR
read emulation, it is used in user space IOCSR read completion now. Also
it should be used in kernel IOCSR read emulation.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2025-09-23 23:37:08 +08:00
committed by Huacai Chen
parent 80edf90831
commit 44598fe776
1 changed files with 6 additions and 6 deletions
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12
arch/loongarch/kvm/exit.c
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@@ -218,16 +218,16 @@ int kvm_emu_iocsr(larch_inst inst, struct kvm_run *run, struct kvm_vcpu *vcpu)
}
trace_kvm_iocsr(KVM_TRACE_IOCSR_WRITE, run->iocsr_io.len, addr, val);
} else {
vcpu->arch.io_gpr = rd; /* Set register id for iocsr read completion */
idx = srcu_read_lock(&vcpu->kvm->srcu);
ret = kvm_io_bus_read(vcpu, KVM_IOCSR_BUS, addr, run->iocsr_io.len, val);
ret = kvm_io_bus_read(vcpu, KVM_IOCSR_BUS, addr,
run->iocsr_io.len, run->iocsr_io.data);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (ret == 0)
if (ret == 0) {
kvm_complete_iocsr_read(vcpu, run);
ret = EMULATE_DONE;
else {
} else
ret = EMULATE_DO_IOCSR;
/* Save register id for iocsr read completion */
vcpu->arch.io_gpr = rd;
}
trace_kvm_iocsr(KVM_TRACE_IOCSR_READ, run->iocsr_io.len, addr, NULL);
}