linux-kernel - [PATCH] RISC-V: KVM: Delegate illegal instruction fault

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Message-Id: <20250620091720.85633-1-luxu.kernel@bytedance.com>
Date: Fri, 20 Jun 2025 17:17:20 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: anup@...infault.org,
	atish.patra@...ux.dev,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr
Cc: kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [PATCH] RISC-V: KVM: Delegate illegal instruction fault

Delegate illegal instruction fault to VS mode in default to avoid such
exceptions being trapped to HS and redirected back to VS.

Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
---
 arch/riscv/include/asm/kvm_host.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 85cfebc32e4cf..97cc2c0dba73a 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -48,6 +48,7 @@
 					 BIT(EXC_SYSCALL)         | \
 					 BIT(EXC_INST_PAGE_FAULT) | \
 					 BIT(EXC_LOAD_PAGE_FAULT) | \
+					 BIT(EXC_INST_ILLEGAL)    | \
 					 BIT(EXC_STORE_PAGE_FAULT))
 
 #define KVM_HIDELEG_DEFAULT		(BIT(IRQ_VS_SOFT)  | \
-- 
2.20.1