Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 17/52] KVM: VMX: Force seg.base == (seg.sel << 4) in real mode | Date | Sun, 30 Dec 2007 09:10:03 +0200 |
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From: Jan Kiszka <jan.kiszka@siemens.com>
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> --- 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 c23f399..fbe792d 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); } -- 1.5.3.7
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