linux-kernel - [RFC PATCH v2 4/7] RISC-V: KVM: Remove 's' & 'u' as valid ISA extension

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Date:   Fri,  4 Mar 2022 12:10:17 -0800
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atishp@...osinc.com>,
        Atish Patra <atishp@...shpatra.org>,
        Anup Patel <anup@...infault.org>,
        Damien Le Moal <damien.lemoal@....com>,
        devicetree@...r.kernel.org, Jisheng Zhang <jszhang@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: [RFC PATCH v2 4/7] RISC-V: KVM: Remove 's' & 'u' as valid ISA extension

There are no ISA extension defined as 's' & 'u' in RISC-V specifications.
The misa register defines 's' & 'u' bit as Supervisor/User privilege mode
enabled. But it should not appear in the ISA extension in the device tree.

Remove those from the allowed ISA extension for kvm.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/kvm/vcpu.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 624166004e36..3ae545e7b398 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -43,9 +43,7 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
 				 riscv_isa_extension_mask(d) | \
 				 riscv_isa_extension_mask(f) | \
 				 riscv_isa_extension_mask(i) | \
-				 riscv_isa_extension_mask(m) | \
-				 riscv_isa_extension_mask(s) | \
-				 riscv_isa_extension_mask(u))
+				 riscv_isa_extension_mask(m))
 
 static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
 {
-- 
2.30.2