linux-kernel - [PATCH v4] RISC-V: KVM: Delegate illegal instruction fault to VS mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250714094554.89151-1-luxu.kernel@bytedance.com>
Date: Mon, 14 Jul 2025 17:45:54 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: rkrcmar@...tanamicro.com,
	cleger@...osinc.com,
	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 v4] RISC-V: KVM: Delegate illegal instruction fault to VS mode

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

The delegation of illegal instruction fault is particularly important
to guest applications that use vector instructions frequently. In such
cases, an illegal instruction fault will be raised when guest user thread
uses vector instruction the first time and then guest kernel will enable
user thread to execute following vector instructions.

The fw pmu event counter remains undeleted so that guest can still query
illegal instruction events via sbi call. Guest will only see zero count
on illegal instruction faults and know 'firmware' has delegated it.

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..3f6b9270f366a 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -44,6 +44,7 @@
 #define KVM_REQ_STEAL_UPDATE		KVM_ARCH_REQ(6)

 #define KVM_HEDELEG_DEFAULT		(BIT(EXC_INST_MISALIGNED) | \
+					 BIT(EXC_INST_ILLEGAL)     | \
 					 BIT(EXC_BREAKPOINT)      | \
 					 BIT(EXC_SYSCALL)         | \
 					 BIT(EXC_INST_PAGE_FAULT) | \
-- 
2.20.1