linux-kernel - [PATCH 2/2] LoongArch: KVM: Add sign extension with kernel IOCSR read emulation

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Message-Id: <20250819121725.2423941-3-maobibo@loongson.cn>
Date: Tue, 19 Aug 2025 20:17:25 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Xianglai Li <lixianglai@...ngson.cn>
Cc: kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] LoongArch: KVM: Add sign extension with kernel IOCSR read emulation

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

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/kvm/exit.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 6fee1b8c35eb..e4ad2d4acdf1 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -218,16 +218,17 @@ 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 {
+		/* Save register id for iocsr read completion */
+		vcpu->arch.io_gpr = rd;
 		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);
 	}
 
-- 
2.39.3