Patchwork [09/35] kvm: x86: Fix DPL write back of segment registers

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Submitter Marcelo Tosatti
Date Jan. 6, 2011, 5:56 p.m.
Message ID <6d3896a6793615161dedaefd04e0b21cf71c86dd.1294336601.git.mtosatti@redhat.com>
Download mbox | patch
Permalink /patch/77755/
State New
Headers show

Comments

Marcelo Tosatti - Jan. 6, 2011, 5:56 p.m.
From: Jan Kiszka <jan.kiszka@siemens.com>

The DPL is stored in the flags and not in the selector. In fact, the RPL
may differ from the DPL at some point in time, and so we were corrupting
the guest state so far.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 target-i386/kvm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Patch

diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 9a4bf98..ee7bdf8 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -602,7 +602,7 @@  static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
     lhs->limit = rhs->limit;
     lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
     lhs->present = (flags & DESC_P_MASK) != 0;
-    lhs->dpl = rhs->selector & 3;
+    lhs->dpl = (flags >> DESC_DPL_SHIFT) & 3;
     lhs->db = (flags >> DESC_B_SHIFT) & 1;
     lhs->s = (flags & DESC_S_MASK) != 0;
     lhs->l = (flags >> DESC_L_SHIFT) & 1;