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authorPaolo Bonzini <pbonzini@redhat.com>2014-08-18 13:15:51 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2014-08-19 15:12:28 +0200
commit9a4cfb27f7233610c5ddc82329c26d39683fad72 (patch)
treebc07f3fc14295c10037ec7adc6b0444f25515740 /arch/x86
parent3a6095a0173ad8f20c508446880558c9f9224324 (diff)
downloadop-kernel-dev-9a4cfb27f7233610c5ddc82329c26d39683fad72.zip
op-kernel-dev-9a4cfb27f7233610c5ddc82329c26d39683fad72.tar.gz
KVM: x86: do not check CS.DPL against RPL during task switch
This reverts the check added by commit 5045b468037d (KVM: x86: check CS.DPL against RPL during task switch, 2014-05-15). Although the CS.DPL=CS.RPL check is mentioned in table 7-1 of the SDM as causing a #TSS exception, it is not mentioned in table 6-6 that lists "invalid TSS conditions" which cause #TSS exceptions. In fact it causes some tests to fail, which pass on bare-metal. Keep the rest of the commit, since we will find new uses for it in 3.18. Reported-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/emulate.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ef117b8..03954f7 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1491,9 +1491,6 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
goto exception;
break;
case VCPU_SREG_CS:
- if (in_task_switch && rpl != dpl)
- goto exception;
-
if (!(seg_desc.type & 8))
goto exception;
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