From nobody Thu Apr 2 08:55:08 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9C88437E2F3; Mon, 30 Mar 2026 03:58:43 +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=1774843127; cv=none; b=Pe8WMGvfTrfsyJYwEyjdZ75B2ylbmppbU3ohzqIoA32gG9DQCza0Fj7l63uypodGjOPrrHlBERCJz/F/TeFZMUjG21vvwT3rAzYmFUTDBg9owXjT+++emCTbZsvtXs4XGUjuGTdirGk47lbwGGXk6NxEV3l10SYXc46xiRsMHfQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774843127; c=relaxed/simple; bh=W7OAHQraw1gdBGtic7MB0Md5fgkWMELvqZ5WQ/SVRf8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=s8e1UDLEQpSLrGXbIs0ILfzNYwqLc1X+Bqbr+MIFBhqMyE0QeQ/5p3+diQ24Pl/vJy+jUGW7I9H/5cq2+M3MSue/cx+sm9fFmUDsLHMDu7I6D71L81nfG9vc2qlJqtc1uC1fu7AHiZGivBh06l1GK1Fqwh6wlwOwd1ksJsc81ss= 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 _____8Cx48Dr9MlpP9IfAA--.31070S3; Mon, 30 Mar 2026 11:58:35 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.213]) by front1 (Coremail) with SMTP id qMiowJCx_8Lq9MlpwXFgAA--.53173S3; Mon, 30 Mar 2026 11:58:35 +0800 (CST) From: Bibo Mao To: Huacai Chen Cc: kernel@xen0n.name, kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/6] LoongArch: KVM: Add separate KVM_REQ_LBT_LOAD request bit Date: Mon, 30 Mar 2026 11:58:27 +0800 Message-Id: <20260330035832.2204720-2-maobibo@loongson.cn> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20260330035832.2204720-1-maobibo@loongson.cn> References: <20260330035832.2204720-1-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: qMiowJCx_8Lq9MlpwXFgAA--.53173S3 X-CM-SenderInfo: xpdruxter6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7 ZEXasCq-sGcSsGvfJ3UbIjqfuFe4nvWSU5nxnvy29KBjDU0xBIdaVrnUUvcSsGvfC2Kfnx nUUI43ZEXa7xR_UUUUUUUUU== Content-Type: text/plain; charset="utf-8" There are different structures with LBT and FPU register restore, with LBT the structure is vcpu::arch::lbt, with FPU the structure is vcpu::arch::fpu. And FPU/LSX/LASX saving and restoring share the common structure vcpu::arch::fpu. New request bit KVM_REQ_LBT_LOAD is used for LBT register restore. Signed-off-by: Bibo Mao --- arch/loongarch/include/asm/kvm_host.h | 1 + arch/loongarch/kvm/exit.c | 6 ++---- arch/loongarch/kvm/vcpu.c | 6 +++--- 3 files changed, 6 insertions(+), 7 deletions(-) diff --git a/arch/loongarch/include/asm/kvm_host.h b/arch/loongarch/include= /asm/kvm_host.h index 19eb5e5c3984..035e698309d0 100644 --- a/arch/loongarch/include/asm/kvm_host.h +++ b/arch/loongarch/include/asm/kvm_host.h @@ -38,6 +38,7 @@ #define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(1) #define KVM_REQ_PMU KVM_ARCH_REQ(2) #define KVM_REQ_AUX_LOAD KVM_ARCH_REQ(3) +#define KVM_REQ_LBT_LOAD KVM_ARCH_REQ(4) =20 #define KVM_GUESTDBG_SW_BP_MASK \ (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index da0ad89f2eb7..3e06a66a90f8 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -827,10 +827,8 @@ static int kvm_handle_lbt_disabled(struct kvm_vcpu *vc= pu, int ecode) { if (!kvm_guest_has_lbt(&vcpu->arch)) kvm_queue_exception(vcpu, EXCCODE_INE, 0); - else { - vcpu->arch.aux_ldtype =3D KVM_LARCH_LBT; - kvm_make_request(KVM_REQ_AUX_LOAD, vcpu); - } + else + kvm_make_request(KVM_REQ_LBT_LOAD, vcpu); =20 return RESUME_GUEST; } diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 831f381a8fd1..2f2c1cbe127c 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -249,15 +249,15 @@ static void kvm_late_check_requests(struct kvm_vcpu *= vcpu) case KVM_LARCH_LASX: kvm_own_lasx(vcpu); break; - case KVM_LARCH_LBT: - kvm_own_lbt(vcpu); - break; default: break; } =20 vcpu->arch.aux_ldtype =3D 0; } + + if (kvm_check_request(KVM_REQ_LBT_LOAD, vcpu)) + kvm_own_lbt(vcpu); } =20 /* --=20 2.39.3