From: Gleb Natapov <g...@redhat.com>
VMX checks that base is equal segment shifted 4 bits left. Otherwise
guest entry fails.
Signed-off-by: Gleb Natapov <g...@redhat.com>
Signed-off-by: Avi Kivity <a...@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2260783..f107315 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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)
--
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