diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2007-11-19 10:21:45 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 17:53:06 +0200 |
| commit | 15b00f32d53f31fe194b17ca0384a37756b55be2 (patch) | |
| tree | 2555b34389c6a4a3c24569201b6504794b566d5d | |
| parent | 54f1585a8d0131bc3993902d4441f4049daed0d5 (diff) | |
KVM: VMX: Force seg.base == (seg.sel << 4) in real mode
Ensure that segment.base == segment.selector << 4 when entering the real
mode on Intel so that the CPU will not bark at us. This fixes some old
protected mode demo from http://www.x86.org/articles/pmbasics/tspec_a1_doc.htm.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
| -rw-r--r-- | drivers/kvm/vmx.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 0c082faaa6d..b4c0bdce7b3 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1165,7 +1165,8 @@ static void fix_rmode_seg(int seg, struct kvm_save_segment *save) save->base = vmcs_readl(sf->base); save->limit = vmcs_read32(sf->limit); save->ar = vmcs_read32(sf->ar_bytes); - vmcs_write16(sf->selector, vmcs_readl(sf->base) >> 4); + vmcs_write16(sf->selector, save->base >> 4); + vmcs_write32(sf->base, save->base & 0xfffff); vmcs_write32(sf->limit, 0xffff); vmcs_write32(sf->ar_bytes, 0xf3); } |