VMX checks that base is equal segment shifted 4 bites left. Otherwise guest entry fails.
Signed-off-by: Gleb Natapov <[email protected]> --- v1->v2 add printk_once. diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 2260783..e1eecf0 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1736,9 +1736,11 @@ 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 16 bit aligned when entering protected mode (seg=%d)", seg); } static void enter_rmode(struct kvm_vcpu *vcpu) -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
