Commit 955853cf authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
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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: 1ad7efa5 ("LoongArch: KVM: Add EIOINTC user mode read and write functions")
Signed-off-by: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent cc8d5b20

arch/loongarch/kvm/intc/eiointc.c

+6 −0
Original line number Diff line number Diff line
@@ -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: