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

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Function kvm_complete_mmio_read() is to add sign extension with MMIO
read emulation, it is used in user space MMIO read completion now. Also
it should be used in kernel MMIO 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 7109f51bcc
commit 80edf90831
1 changed files with 4 additions and 3 deletions
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7
arch/loongarch/kvm/exit.c
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@ -468,6 +468,8 @@ int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst)
if (ret == EMULATE_DO_MMIO) {
trace_kvm_mmio(KVM_TRACE_MMIO_READ, run->mmio.len, run->mmio.phys_addr, NULL);
vcpu->arch.io_gpr = rd; /* Set for kvm_complete_mmio_read() use */
/*
* If mmio device such as PCH-PIC is emulated in KVM,
* it need not return to user space to handle the mmio
@ -475,16 +477,15 @@ int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst)
*/
idx = srcu_read_lock(&vcpu->kvm->srcu);
ret = kvm_io_bus_read(vcpu, KVM_MMIO_BUS, vcpu->arch.badv,
run->mmio.len, &vcpu->arch.gprs[rd]);
run->mmio.len, run->mmio.data);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (!ret) {
kvm_complete_mmio_read(vcpu, run);
update_pc(&vcpu->arch);
vcpu->mmio_needed = 0;
return EMULATE_DONE;
}
/* Set for kvm_complete_mmio_read() use */
vcpu->arch.io_gpr = rd;
run->mmio.is_write = 0;
vcpu->mmio_is_write = 0;
return EMULATE_DO_MMIO;