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Commit 4088bb3c authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

KVM: silence lapic kernel messages that can be triggered by a guest 



Some Linux versions (f8) try to read EOI register that is write only.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent a1b37100

arch/x86/kvm/lapic.c

+4 −4
Original line number Diff line number Diff line
@@ -597,13 +597,13 @@ static int apic_reg_read(struct kvm_lapic *apic, u32 offset, int len, 
	static const u64 rmask = 0x43ff01ffffffe70cULL;



	if ((alignment + len) > 4) {

		printk(KERN_ERR "KVM_APIC_READ: alignment error %x %d\n",

		apic_debug("KVM_APIC_READ: alignment error %x %d\n",

			   offset, len);

		return 1;

	}



	if (offset > 0x3f0 || !(rmask & (1ULL << (offset >> 4)))) {

		printk(KERN_ERR "KVM_APIC_READ: read reserved register %x\n",

		apic_debug("KVM_APIC_READ: read reserved register %x\n",

			   offset);

		return 1;

	}