From 038881c8bec0e9a796d1782c56e29e7c2456626d Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Wed, 21 Mar 2007 17:58:32 +0200 Subject: [PATCH] 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 --- drivers/kvm/vmx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 027a962..578dff5 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -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; -- 2.7.4