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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: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-12-27 17:25:04 +02:00 committed by Avi Kivity
parent f8e453b00c
commit 444e863d13
1 changed files with 5 additions and 1 deletions
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6
arch/x86/kvm/vmx.c
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@ -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)