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KVM: Hack real-mode segments on vmx from KVM_SET_SREGS 

As usual, we need to mangle segment registers when emulating real mode
as vm86 has specific constraints.  We special case the reset segment base,
and set the "access rights" (or descriptor flags) to vm86 comaptible values.

This fixes reboot on vmx.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-03-21 17:58:32 +02:00
parent 024aa1c02f
commit 038881c8be
1 changed files with 8 additions and 1 deletions
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9
drivers/kvm/vmx.c
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@ -864,7 +864,14 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu,
vmcs_writel(sf->base, var->base);
vmcs_write32(sf->limit, var->limit);
vmcs_write16(sf->selector, var->selector);
if (var->unusable)
if (vcpu->rmode.active && var->s) {
/*
* Hack real-mode segments into vm86 compatibility.
*/
if (var->base == 0xffff0000 && var->selector == 0xf000)
vmcs_writel(sf->base, 0xf0000);
ar = 0xf3;
} else if (var->unusable)
ar = 1 << 16;
else {
ar = var->type & 15;