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KVM: x86: Emulator ignores LDTR/TR extended base on LLDT/LTR 

The current implementation ignores the LDTR/TR base high 32-bits on long-mode.
As a result the loaded segment descriptor may be incorrect.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-06-02 18:34:04 +03:00 committed by Paolo Bonzini
parent 7fe864dc94
commit e37a75a13c
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kvm/emulate.c
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@ -1422,6 +1422,7 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
ulong desc_addr; ulong desc_addr;
int ret; int ret;
u16 dummy; u16 dummy;
u32 base3 = 0;
memset(&seg_desc, 0, sizeof seg_desc); memset(&seg_desc, 0, sizeof seg_desc);
@ -1538,9 +1539,14 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
ret = write_segment_descriptor(ctxt, selector, &seg_desc); ret = write_segment_descriptor(ctxt, selector, &seg_desc);
if (ret != X86EMUL_CONTINUE) if (ret != X86EMUL_CONTINUE)
return ret; return ret;
} else if (ctxt->mode == X86EMUL_MODE_PROT64) {
ret = ctxt->ops->read_std(ctxt, desc_addr+8, &base3,
sizeof(base3), &ctxt->exception);
if (ret != X86EMUL_CONTINUE)
return ret;
} }
load: load:
ctxt->ops->set_segment(ctxt, selector, &seg_desc, 0, seg); ctxt->ops->set_segment(ctxt, selector, &seg_desc, base3, seg);
return X86EMUL_CONTINUE; return X86EMUL_CONTINUE;
exception: exception:
emulate_exception(ctxt, err_vec, err_code, true); emulate_exception(ctxt, err_vec, err_code, true);