linux-kernel - [PATCH v2] RISC-V: KVM: Introduce KVM_EXIT_FAIL_ENTRY_NO

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Message-Id: <20250923053851.32863-1-xiangwencheng@lanxincomputing.com>
Date: Tue, 23 Sep 2025 13:38:51 +0800
From: "BillXiang" <xiangwencheng@...xincomputing.com>
To: <anup@...infault.org>
Cc: <kvm-riscv@...ts.infradead.org>, <kvm@...r.kernel.org>, 
	<linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, 
	<paul.walmsley@...ive.com>, <palmer@...belt.com>, 
	<aou@...s.berkeley.edu>, <alex@...ti.fr>, <atish.patra@...ux.dev>, 
	<ajones@...tanamicro.com>, 
	"BillXiang" <xiangwencheng@...xincomputing.com>
Subject: [PATCH v2] RISC-V: KVM: Introduce KVM_EXIT_FAIL_ENTRY_NO_VSFILE

Currently, we return CSR_HSTATUS as hardware_entry_failure_reason when
kvm_riscv_aia_alloc_hgei failed in KVM_DEV_RISCV_AIA_MODE_HWACCEL
mode, which is vague so it is better to return a well defined value
KVM_EXIT_FAIL_ENTRY_NO_VSFILE provided via uapi/asm/kvm.h.

Signed-off-by: BillXiang <xiangwencheng@...xincomputing.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 2 ++
 arch/riscv/kvm/aia_imsic.c        | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index ef27d4289da1..068d4d9cff7b 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -23,6 +23,8 @@
 #define KVM_INTERRUPT_SET	-1U
 #define KVM_INTERRUPT_UNSET	-2U
 
+#define KVM_EXIT_FAIL_ENTRY_NO_VSFILE	(1ULL << 0)
+
 /* for KVM_GET_REGS and KVM_SET_REGS */
 struct kvm_regs {
 };
diff --git a/arch/riscv/kvm/aia_imsic.c b/arch/riscv/kvm/aia_imsic.c
index fda0346f0ea1..937963fb46c5 100644
--- a/arch/riscv/kvm/aia_imsic.c
+++ b/arch/riscv/kvm/aia_imsic.c
@@ -802,7 +802,7 @@ int kvm_riscv_vcpu_aia_imsic_update(struct kvm_vcpu *vcpu)
 		/* For HW acceleration mode, we can't continue */
 		if (kvm->arch.aia.mode == KVM_DEV_RISCV_AIA_MODE_HWACCEL) {
 			run->fail_entry.hardware_entry_failure_reason =
-								CSR_HSTATUS;
+								KVM_EXIT_FAIL_ENTRY_NO_VSFILE;
 			run->fail_entry.cpu = vcpu->cpu;
 			run->exit_reason = KVM_EXIT_FAIL_ENTRY;
 			return 0;
-- 
2.43.0