linux-kernel - [PATCH v2 5/5] RISC-V: KVM: Remove the boot time enabling of hstateen bits

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

Message-Id: <20250522-kvm_lazy_enable_stateen-v2-5-b7a84991f1c4@rivosinc.com>
Date: Thu, 22 May 2025 13:35:29 -0700
From: Atish Patra <atishp@...osinc.com>
To: Anup Patel <anup@...infault.org>, Atish Patra <atishp@...shpatra.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Alexandre Ghiti <alex@...ti.fr>
Cc: kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, 
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Atish Patra <atishp@...osinc.com>
Subject: [PATCH v2 5/5] RISC-V: KVM: Remove the boot time enabling of
 hstateen bits

All the existing hstateen bits can be enabled at runtime upon
first access now. Remove the default enabling at bootime now.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/vcpu.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 02635bac91f1..aa8f7f67646a 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -562,16 +562,6 @@ static void kvm_riscv_vcpu_setup_config(struct kvm_vcpu *vcpu)
 	    !riscv_isa_extension_available(isa, SVADE))
 		cfg->henvcfg |= ENVCFG_ADUE;
 
-	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN)) {
-		cfg->hstateen0 |= SMSTATEEN0_HSENVCFG;
-		if (riscv_isa_extension_available(isa, SSAIA))
-			cfg->hstateen0 |= SMSTATEEN0_AIA_IMSIC |
-					  SMSTATEEN0_AIA |
-					  SMSTATEEN0_AIA_ISEL;
-		if (riscv_isa_extension_available(isa, SMSTATEEN))
-			cfg->hstateen0 |= SMSTATEEN0_SSTATEEN0;
-	}
-
 	cfg->hedeleg = KVM_HEDELEG_DEFAULT;
 	if (vcpu->guest_debug)
 		cfg->hedeleg &= ~BIT(EXC_BREAKPOINT);

-- 
2.43.0