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authorAvi Kivity <avi@qumranet.com>2007-03-21 11:58:32 -0400
committerAvi Kivity <avi@qumranet.com>2007-05-03 03:52:26 -0400
commit038881c8bec0e9a796d1782c56e29e7c2456626d (patch)
tree8ca64ffb2f06cb29fa3fda3b9987defc2ece18a4
parent024aa1c02f0a9f938af83f55c727bcb18187eba4 (diff)
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>
-rw-r--r--drivers/kvm/vmx.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 027a9625ef90..578dff5424e3 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -864,7 +864,14 @@ static void vmx_set_segment(struct kvm_vcpu *vcpu,
864 vmcs_writel(sf->base, var->base); 864 vmcs_writel(sf->base, var->base);
865 vmcs_write32(sf->limit, var->limit); 865 vmcs_write32(sf->limit, var->limit);
866 vmcs_write16(sf->selector, var->selector); 866 vmcs_write16(sf->selector, var->selector);
867 if (var->unusable) 867 if (vcpu->rmode.active && var->s) {
868 /*
869 * Hack real-mode segments into vm86 compatibility.
870 */
871 if (var->base == 0xffff0000 && var->selector == 0xf000)
872 vmcs_writel(sf->base, 0xf0000);
873 ar = 0xf3;
874 } else if (var->unusable)
868 ar = 1 << 16; 875 ar = 1 << 16;
869 else { 876 else {
870 ar = var->type & 15; 877 ar = var->type & 15;