From 955853cf83657faa58572ef3f08b44f0f88885c1 Mon Sep 17 00:00:00 2001 From: Bibo Mao Date: Fri, 27 Jun 2025 18:27:44 +0800 Subject: [PATCH] LoongArch: KVM: Disable updating of "num_cpu" and "feature" Property "num_cpu" and "feature" are read-only once eiointc is created, which are set with KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL attr group before device creation. Attr group KVM_DEV_LOONGARCH_EXTIOI_GRP_SW_STATUS is to update register and software state for migration and reset usage, property "num_cpu" and "feature" can not be update again if it is created already. Here discard write operation with property "num_cpu" and "feature" in attr group KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL. Cc: stable@vger.kernel.org Fixes: 1ad7efa552fd ("LoongArch: KVM: Add EIOINTC user mode read and write functions") Signed-off-by: Bibo Mao Signed-off-by: Huacai Chen --- arch/loongarch/kvm/intc/eiointc.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c index 056a75f7d090..a75f865d6fb9 100644 --- a/arch/loongarch/kvm/intc/eiointc.c +++ b/arch/loongarch/kvm/intc/eiointc.c @@ -926,9 +926,15 @@ static int kvm_eiointc_sw_status_access(struct kvm_device *dev, data = (void __user *)attr->addr; switch (addr) { case KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_NUM_CPU: + if (is_write) + return ret; + p = &s->num_cpu; break; case KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_FEATURE: + if (is_write) + return ret; + p = &s->features; break; case KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_STATE: -- 2.50.1