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LoongArch: KVM: Disable updating of "num_cpu" and "feature"

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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: 1ad7efa552 ("LoongArch: KVM: Add EIOINTC user mode read and write functions")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2025-06-27 18:27:44 +08:00 • committed by Huacai Chen
parent cc8d5b209e
commit 955853cf83
1 changed files with 6 additions and 0 deletions
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6
arch/loongarch/kvm/intc/eiointc.c
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@ -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: