Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 4/9] KVM: SVM: Add intercept checks for descriptor table accesses | Date | Wed, 24 Nov 2010 19:18:30 +0100 |
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This patch adds checks for accesses to the descriptor table base registers to the intruction emulator path of KVM.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- arch/x86/kvm/svm.c | 28 ++++++++++++++++++++++++++++ 1 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 16ff569..035c5b5 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3636,12 +3636,40 @@ static int svm_insn_intercepted(struct kvm_vcpu *vcpu, goto out; switch (c->b) { + case 0x00: + switch (c->modrm_reg) { + case 0x00: /* SLDT */ + vmcb->control.exit_code = SVM_EXIT_LDTR_READ; + break; + case 0x01: /* STR */ + vmcb->control.exit_code = SVM_EXIT_TR_READ; + break; + case 0x02: /* LLDT */ + vmcb->control.exit_code = SVM_EXIT_LDTR_WRITE; + break; + case 0x03: /* LTR */ + vmcb->control.exit_code = SVM_EXIT_TR_WRITE; + break; + } + break; case 0x01: /* 0x0f 0x01 and modrm_mod == 3 encodes special instructions */ if (c->modrm_mod == 3) break; switch (c->modrm_reg) { + case 0x00: /* SGDT */ + vmcb->control.exit_code = SVM_EXIT_GDTR_READ; + break; + case 0x01: /* SIDT */ + vmcb->control.exit_code = SVM_EXIT_IDTR_READ; + break; + case 0x02: /* LGDT */ + vmcb->control.exit_code = SVM_EXIT_GDTR_WRITE; + break; + case 0x03: /* LIDT */ + vmcb->control.exit_code = SVM_EXIT_IDTR_WRITE; + break; case 0x04: /* SMSW */ vmcb->control.exit_code = SVM_EXIT_READ_CR0; break; -- 1.7.1
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