linux-kernel - [PATCH v16 10/30] LoongArch: KVM: Implement vcpu ENABLE

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Date:   Thu, 29 Jun 2023 15:55:18 +0800
From:   Tianrui Zhao <zhaotianrui@...ngson.cn>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn,
        Xi Ruoyao <xry111@...111.site>, zhaotianrui@...ngson.cn,
        tangyouling@...ngson.cn, hejinyang@...ngson.cn
Subject: [PATCH v16 10/30] LoongArch: KVM: Implement vcpu ENABLE_CAP ioctl interface

Implement LoongArch vcpu KVM_ENABLE_CAP ioctl interface.

Reviewed-by: Bibo Mao <maobibo@...ngson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@...ngson.cn>
---
 arch/loongarch/kvm/vcpu.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index b0cce413762d..da97b77da8eb 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -186,6 +186,16 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 	return 0;
 }
 
+static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
+				     struct kvm_enable_cap *cap)
+{
+	/*
+	 * FPU is enable by default, do not support any other caps,
+	 * and later we will support such as LSX cap.
+	 */
+	return -EINVAL;
+}
+
 long kvm_arch_vcpu_ioctl(struct file *filp,
 			 unsigned int ioctl, unsigned long arg)
 {
@@ -209,6 +219,15 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 			r = _kvm_get_reg(vcpu, &reg);
 		break;
 	}
+	case KVM_ENABLE_CAP: {
+		struct kvm_enable_cap cap;
+
+		r = -EFAULT;
+		if (copy_from_user(&cap, argp, sizeof(cap)))
+			break;
+		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
+		break;
+	}
 	default:
 		r = -ENOIOCTLCMD;
 		break;
-- 
2.39.1