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RISC-V: KVM: Reset the SBI extension when disable it

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The SBI extension validation callback can only fix the parameter if
the extension is enabled. However, if the extension is disabled after
modifty some parameters, the state of the extension is still broken.

Reset the extension when the extension is disabled so it can have
a clear context.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260729232527.139183-4-inochiama@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Inochi Amaoto 2026-07-30 07:25:24 +08:00 committed by Anup Patel
parent b88cb6998f
commit 52132eec63
1 changed files with 7 additions and 0 deletions
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7
arch/riscv/kvm/vcpu_sbi.c
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@ -221,6 +221,7 @@ static int riscv_vcpu_set_sbi_ext_single(struct kvm_vcpu *vcpu,
{
struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
const struct kvm_riscv_sbi_extension_entry *sext;
const struct kvm_vcpu_sbi_extension *ext;
if (reg_val != 1 && reg_val != 0)
return -EINVAL;
@ -229,6 +230,12 @@ static int riscv_vcpu_set_sbi_ext_single(struct kvm_vcpu *vcpu,
if (!sext || scontext->ext_status[sext->ext_idx] == KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE)
return -ENOENT;
ext = sext->ext_ptr;
if (!reg_val && scontext->ext_status[sext->ext_idx] == KVM_RISCV_SBI_EXT_STATUS_ENABLED &&
ext->reset)
ext->reset(vcpu);
scontext->ext_status[sext->ext_idx] = (reg_val) ?
KVM_RISCV_SBI_EXT_STATUS_ENABLED :
KVM_RISCV_SBI_EXT_STATUS_DISABLED;