From patchwork Wed Jun 26 06:32:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bibo Mao X-Patchwork-Id: 13712334 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A0C2E145356; Wed, 26 Jun 2024 06:32:47 +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=1719383570; cv=none; b=mrqNOykOvgfFhU/te75uRbNLRB64UOx0EOloZJTUcC3KJMSaenl0ONEVnckyelpfEVpNnez0Js3Kz6Mo+lj8h+WehVApbVvH64sKchyLDm4VN+wyyxwoX/B68ZeYtkhLyr7p+wflj3Ei6lSXO9c8NchPN0+WM+pon2sMtQtdaFQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719383570; c=relaxed/simple; bh=04LylK4WLFzgwQvnXifumbQ9XXXgzpCJwzHl8Nf3rRM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=qYWD3MIZctWC2YAvgtnBG9q9n0BrSG+bmp1iCjd0N+GyLs8YalPetcunIgQLB0Ve5aL3N4+Qwlt2dMD2rAG537np7x7Jl9XDo0tWaikTQHM8f+SeMDih5so37QUFyqLkbEPj9Vd9iyPQCbqXgNZzKvlve37KCo3BaXTHEJu/7DQ= 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 _____8Bxb+sItntm+CkKAA--.40648S3; Wed, 26 Jun 2024 14:32:40 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by localhost.localdomain (Coremail) with SMTP id AQAAf8BxHMcHtntmo5ExAA--.53222S2; Wed, 26 Jun 2024 14:32:39 +0800 (CST) From: Bibo Mao To: Tianrui Zhao , Huacai Chen Cc: WANG Xuerui , kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/3] LoongArch: KVM: Add Binary Translation extension support Date: Wed, 26 Jun 2024 14:32:36 +0800 Message-Id: <20240626063239.3722175-1-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: AQAAf8BxHMcHtntmo5ExAA--.53222S2 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Loongson Binary Translation (LBT) is used to accelerate binary translation, which contains 4 scratch registers (scr0 to scr3), x86/ARM eflags (eflags) and x87 fpu stack pointer (ftop). Like FPU extension, here late enabling method is used for LBT. LBT context is saved/restored on vcpu context switch path. Also this patch set BT capability detection, and BT register get/set interface for userspace vmm, so that vm supports migration with BT extension. --- v3 ... v4: 1. Merge LBT feature detection for VM and VCPU into one patch. 2. Move function declaration such as kvm_lose_lbt()/kvm_check_fcsr()/ kvm_enable_lbt_fpu() from header file to c file, since it is only used in one c file. v2 ... v3: 1. Split KVM_LOONGARCH_VM_FEAT_LBT capability checking into three sub-features, KVM_LOONGARCH_VM_FEAT_X86BT/KVM_LOONGARCH_VM_FEAT_ARMBT and KVM_LOONGARCH_VM_FEAT_MIPSBT. Return success only if host supports the sub-feature. v1 ... v2: 1. With LBT register read or write interface to userpace, replace device attr method with KVM_GET_ONE_REG method, since lbt register is vcpu register and can be added in kvm_reg_list in future. 2. Add vm device attr ctrl marcro KVM_LOONGARCH_VM_FEAT_CTRL, it is used to get supported LBT feature before vm or vcpu is created. --- Bibo Mao (3): LoongArch: KVM: Add HW Binary Translation extension support LoongArch: KVM: Add LBT feature detection function LoongArch: KVM: Add vm migration support for LBT registers arch/loongarch/include/asm/kvm_host.h | 8 ++ arch/loongarch/include/asm/kvm_vcpu.h | 10 +++ arch/loongarch/include/uapi/asm/kvm.h | 15 ++++ arch/loongarch/kvm/exit.c | 9 ++ arch/loongarch/kvm/vcpu.c | 121 +++++++++++++++++++++++++- arch/loongarch/kvm/vm.c | 44 +++++++++- 6 files changed, 205 insertions(+), 2 deletions(-) base-commit: 55027e689933ba2e64f3d245fb1ff185b3e7fc81