Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | From | Joerg Roedel <> | Subject | [PATCH 2/9] KVM: SVM: Add checks for CRx read and write intercepts | Date | Wed, 24 Nov 2010 19:18:28 +0100 |
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This patch add code to check for any CRx read, write, and the selective-cr0 intercepts for instructions emulated in software by KVM.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- arch/x86/kvm/svm.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 72 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index d1721c2..29f0491 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3622,7 +3622,78 @@ static void svm_fpu_deactivate(struct kvm_vcpu *vcpu) static int svm_insn_intercepted(struct kvm_vcpu *vcpu, struct x86_emulate_ctxt *ctxt) { - return X86EMUL_CONTINUE; + struct decode_cache *c = &ctxt->decode; + struct vcpu_svm *svm = to_svm(vcpu); + struct vmcb *vmcb = svm->vmcb; + int vmexit, ret; + + if (!is_nested(svm)) + return X86EMUL_CONTINUE; + + ret = X86EMUL_CONTINUE; + + if (!c->twobyte) + goto out; + + switch (c->b) { + case 0x01: + /* 0x0f 0x01 and modrm_mod == 3 encodes special instructions */ + if (c->modrm_mod == 3) + break; + + switch (c->modrm_reg) { + case 0x04: /* SMSW */ + vmcb->control.exit_code = SVM_EXIT_READ_CR0; + break; + case 0x06: { /* LMSW */ + u64 cr0, val; + + vmcb->control.exit_code = SVM_EXIT_WRITE_CR0; + + if (svm->nested.intercept_cr_write & INTERCEPT_CR0_MASK) + break; + + /* check for selective-cr0 special case */ + cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK & 0xf; + val = c->src.val & ~SVM_CR0_SELECTIVE_MASK & 0xf; + + if (cr0 ^ val) + vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE; + + break; + } + } + case 0x06: /* CLTS */ + vmcb->control.exit_code = SVM_EXIT_WRITE_CR0; + break; + case 0x20: /* CR read */ + vmcb->control.exit_code = SVM_EXIT_READ_CR0 + c->modrm_reg; + break; + case 0x22: /* CR write */ + vmcb->control.exit_code = SVM_EXIT_WRITE_CR0 + c->modrm_reg; + if (c->modrm_reg == 0 && + !(svm->nested.intercept_cr_write & INTERCEPT_CR0_MASK)) { + /* check for selective-cr0 special case */ + u64 cr0, val; + + cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK; + val = c->src.val & ~SVM_CR0_SELECTIVE_MASK; + + if (cr0 ^ val) + vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE; + } + break; + } + + vmcb->control.next_rip = ctxt->eip; + vmexit = nested_svm_exit_handled(svm); + + ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED + : X86EMUL_CONTINUE; + +out: + + return ret; } static struct kvm_x86_ops svm_x86_ops = { -- 1.7.1
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