From nobody Sat Oct 4 06:37:05 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 46AA33043B7; Tue, 19 Aug 2025 12:17:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755605854; cv=none; b=YlwmywIkSwuWK8XpIHZRUR/dI8pG/u846+cOwPGgtWjTfynr05v5cZ/S/Y2NHAKVSPJzCvJ1sigokgED+28lvk/84UUCKlcyWduIt/lXO7H3H64ilvMwh/Wqn0dkhiwrFy52zUGAUbPf+CsynHA0vCc0NtwMYfMGpN0DYQ/BRGw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755605854; c=relaxed/simple; bh=b3fKtEESFkXGwU1UZUwDMOpfDptvGhUa48h3ZbMe7vw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=G1gHGbkpccOETNKKTMA0I+LlIorKL1PvcEyeFxPff8vaWFUrSLQMg2F6NE14KuAX9/LbzUaJyVgkkcreXmAxPA5GLODj/2ducx7jeej0AzJ6j5z2Be3AlAjy9i3AVVQ8NVQ3edYnvmBVCMABlGeTCcQWttzaybWo/YzPPf7dVCQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8DxO9JWa6Ror2IAAA--.748S3; Tue, 19 Aug 2025 20:17:27 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJAxfcFWa6Ro2DtYAA--.19719S3; Tue, 19 Aug 2025 20:17:26 +0800 (CST) From: Bibo Mao To: Huacai Chen , Xianglai Li Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] LoongArch: KVM: Add sign extension with kernel MMIO read emulation Date: Tue, 19 Aug 2025 20:17:24 +0800 Message-Id: <20250819121725.2423941-2-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250819121725.2423941-1-maobibo@loongson.cn> References: <20250819121725.2423941-1-maobibo@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJAxfcFWa6Ro2DtYAA--.19719S3 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" Function kvm_complete_mmio_read() is to add sign extension with MMIO read emulation, it is used in user space MMIO read return now. Also it can be used in kernel MMIO read emulation. Signed-off-by: Bibo Mao --- arch/loongarch/kvm/exit.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index 2ce41f93b2a4..6fee1b8c35eb 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -468,6 +468,9 @@ int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst= inst) if (ret =3D=3D EMULATE_DO_MMIO) { trace_kvm_mmio(KVM_TRACE_MMIO_READ, run->mmio.len, run->mmio.phys_addr, = NULL); =20 + /* Set for kvm_complete_mmio_read() use */ + vcpu->arch.io_gpr =3D rd; + /* * If mmio device such as PCH-PIC is emulated in KVM, * it need not return to user space to handle the mmio @@ -475,16 +478,15 @@ int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_in= st inst) */ idx =3D srcu_read_lock(&vcpu->kvm->srcu); ret =3D 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 =3D 0; return EMULATE_DONE; } =20 - /* Set for kvm_complete_mmio_read() use */ - vcpu->arch.io_gpr =3D rd; run->mmio.is_write =3D 0; vcpu->mmio_is_write =3D 0; return EMULATE_DO_MMIO; --=20 2.39.3 From nobody Sat Oct 4 06:37:05 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 24CBE3043AE; Tue, 19 Aug 2025 12:17:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755605854; cv=none; b=TaQTODIJRUWeNy/cNAJp0QP3qaWwn1Wi4dXAN2t2d16z5Dz9C2cUDp0pkiwNFs59mitpI42nOzNHqkrDb213F3rsm/IYSxF/zTlbciBDEQzLABtoeKW3bMT7LzRg18galzV1cQUtNmNraHKgRm2WeiO7PaGylUKg91sDpOE2O1I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755605854; c=relaxed/simple; bh=jQcJukW1CMycA32bM3dXcv/X8VZZZgaakFfxVBaYYxU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ljD0f/KWSvX5816fw8/le1BfEDyZzwvkAQt3DGkn/t9Qqxjn5U7l1elXesc9CKYam0kb1eFMQ2+cWMue4JMgtbOg3qdb+Q3U2+b+EvIejU9z54tUsLRiZxHgf0u52W5vjqoMcOvOLwM6dfLI+qp33tMC14qFtWh+akcTkX7M388= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [10.2.5.213]) by gateway (Coremail) with SMTP id _____8BxWNFXa6Ros2IAAA--.736S3; Tue, 19 Aug 2025 20:17:27 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJAxfcFWa6Ro2DtYAA--.19719S4; Tue, 19 Aug 2025 20:17:26 +0800 (CST) From: Bibo Mao To: Huacai Chen , Xianglai Li Cc: kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] LoongArch: KVM: Add sign extension with kernel IOCSR read emulation Date: Tue, 19 Aug 2025 20:17:25 +0800 Message-Id: <20250819121725.2423941-3-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250819121725.2423941-1-maobibo@loongson.cn> References: <20250819121725.2423941-1-maobibo@loongson.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qMiowJAxfcFWa6Ro2DtYAA--.19719S4 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" 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 --- 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 *ru= n, 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 =3D rd; idx =3D srcu_read_lock(&vcpu->kvm->srcu); - ret =3D kvm_io_bus_read(vcpu, KVM_IOCSR_BUS, addr, run->iocsr_io.len, va= l); + ret =3D 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 =3D=3D 0) + if (ret =3D=3D 0) { + kvm_complete_iocsr_read(vcpu, run); ret =3D EMULATE_DONE; - else { + } else ret =3D EMULATE_DO_IOCSR; - /* Save register id for iocsr read completion */ - vcpu->arch.io_gpr =3D rd; - } trace_kvm_iocsr(KVM_TRACE_IOCSR_READ, run->iocsr_io.len, addr, NULL); } =20 --=20 2.39.3