linux-kernel - [PATCH 3/3] LoongArch: KVM: Set host with kernel mode when switch to VM mode

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Message-Id: <20250207032634.2333300-4-maobibo@loongson.cn>
Date: Fri,  7 Feb 2025 11:26:34 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Tianrui Zhao <zhaotianrui@...ngson.cn>
Cc: Huacai Chen <chenhuacai@...nel.org>,
	WANG Xuerui <kernel@...0n.name>,
	kvm@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] LoongArch: KVM: Set host with kernel mode when switch to VM mode

PRMD and ERA register is only meaningful on the beginning stage
of exception entry, and it can be overwritten for nested irq or
exception.

When CPU runs in VM mode, interrupt need be enabled on host. And the
mode for host had better be kernel mode rather than random.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/kvm/switch.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/kvm/switch.S b/arch/loongarch/kvm/switch.S
index 0c292f818492..1be185e94807 100644
--- a/arch/loongarch/kvm/switch.S
+++ b/arch/loongarch/kvm/switch.S
@@ -85,7 +85,7 @@
 	 * Guest CRMD comes from separate GCSR_CRMD register
 	 */
 	ori	t0, zero, CSR_PRMD_PIE
-	csrxchg	t0, t0,   LOONGARCH_CSR_PRMD
+	csrwr	t0, LOONGARCH_CSR_PRMD
 
 	/* Set PVM bit to setup ertn to guest context */
 	ori	t0, zero, CSR_GSTAT_PVM
-- 
2.39.3