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Commit 444e863d authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
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KVM: VMX: when entering real mode align segment base to 16 bytes 



VMX checks that base is equal segment shifted 4 bits left. Otherwise
guest entry fails.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent f8e453b0

arch/x86/kvm/vmx.c

+5 −1
Original line number Diff line number Diff line
@@ -1736,9 +1736,13 @@ static void fix_rmode_seg(int seg, struct kvm_save_segment *save) 
	save->limit = vmcs_read32(sf->limit);

	save->ar = vmcs_read32(sf->ar_bytes);

	vmcs_write16(sf->selector, save->base >> 4);

	vmcs_write32(sf->base, save->base & 0xfffff);

	vmcs_write32(sf->base, save->base & 0xffff0);

	vmcs_write32(sf->limit, 0xffff);

	vmcs_write32(sf->ar_bytes, 0xf3);

	if (save->base & 0xf)

		printk_once(KERN_WARNING "kvm: segment base is not paragraph"

			    " aligned when entering protected mode (seg=%d)",

			    seg);

}



static void enter_rmode(struct kvm_vcpu *vcpu)