linux-kernel - [PATCH v3 2/4] LoongArch: KVM: Add LBT feature detection with cpucfg

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Message-Id: <20240527074644.836699-3-maobibo@loongson.cn>
Date: Mon, 27 May 2024 15:46:42 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: WANG Xuerui <kernel@...0n.name>,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/4] LoongArch: KVM: Add LBT feature detection with cpucfg

Loongson Binary Translation (LBT) feature is defined in register
cpucfg2. Here LBT capability detection for VM is added.

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

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 8f80d1a2dcbb..c32aff8e261e 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -537,6 +537,12 @@ static int _kvm_get_cpucfg_mask(int id, u64 *v)
 			*v |= CPUCFG2_LSX;
 		if (cpu_has_lasx)
 			*v |= CPUCFG2_LASX;
+		if (cpu_has_lbt_x86)
+			*v |= CPUCFG2_X86BT;
+		if (cpu_has_lbt_arm)
+			*v |= CPUCFG2_ARMBT;
+		if (cpu_has_lbt_mips)
+			*v |= CPUCFG2_MIPSBT;
 
 		return 0;
 	case LOONGARCH_CPUCFG3:
-- 
2.39.3