From ce2ac085ff1500aad157cabd8221b7c38eb751bd Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 1 Mar 2010 15:34:39 +0100 Subject: [PATCH] KVM; SVM: Add correct handling of nested iopm This patch adds the correct handling of the nested io permission bitmap. Old behavior was to not lookup the port in the iopm but only reinject an io intercept to the guest. Signed-off-by: Joerg Roedel Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/svm.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 7cb2eb906eca..ddea391e78cd 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -79,6 +79,7 @@ struct nested_state { /* gpa pointers to the real vectors */ u64 vmcb_msrpm; + u64 vmcb_iopm; /* A VMEXIT is required but not yet emulated */ bool exit_required; @@ -1658,6 +1659,26 @@ static void nested_svm_unmap(struct page *page) kvm_release_page_dirty(page); } +static int nested_svm_intercept_ioio(struct vcpu_svm *svm) +{ + unsigned port; + u8 val, bit; + u64 gpa; + + if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT))) + return NESTED_EXIT_HOST; + + port = svm->vmcb->control.exit_info_1 >> 16; + gpa = svm->nested.vmcb_iopm + (port / 8); + bit = port % 8; + val = 0; + + if (kvm_read_guest(svm->vcpu.kvm, gpa, &val, 1)) + val &= (1 << bit); + + return val ? NESTED_EXIT_DONE : NESTED_EXIT_HOST; +} + static int nested_svm_exit_handled_msr(struct vcpu_svm *svm) { u32 offset, msr, value; @@ -1723,6 +1744,9 @@ static int nested_svm_intercept(struct vcpu_svm *svm) case SVM_EXIT_MSR: vmexit = nested_svm_exit_handled_msr(svm); break; + case SVM_EXIT_IOIO: + vmexit = nested_svm_intercept_ioio(svm); + break; case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR8: { u32 cr_bits = 1 << (exit_code - SVM_EXIT_READ_CR0); if (svm->nested.intercept_cr_read & cr_bits) @@ -2047,6 +2071,7 @@ static bool nested_svm_vmrun(struct vcpu_svm *svm) svm->vmcb->save.cpl = nested_vmcb->save.cpl; svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa; + svm->nested.vmcb_iopm = nested_vmcb->control.iopm_base_pa & ~0x0fffULL; /* cache intercepts */ svm->nested.intercept_cr_read = nested_vmcb->control.intercept_cr_read;