From f7b91ba908bf829a2eda9a8824f3752822925479 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 16 Nov 2020 06:13:15 -0500 Subject: [PATCH] KVM: nSVM: do not copy vmcb01->control blindly to vmcb02->control Most fields were going to be overwritten by vmcb12 control fields, or do not matter at all because they are filled by the processor on vmexit. Therefore, we need not copy them from vmcb01 to vmcb02 on vmentry. Signed-off-by: Paolo Bonzini --- arch/x86/kvm/svm/nested.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 4d136465dee11..f88d0614d9b85 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -428,9 +428,28 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) { const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK; - /* FIXME: go through each field one by one. */ - svm->nested.vmcb02.ptr->control = svm->vmcb01.ptr->control; + /* + * Filled at exit: exit_code, exit_code_hi, exit_info_1, exit_info_2, + * exit_int_info, exit_int_info_err, next_rip, insn_len, insn_bytes. + */ + + /* + * Also covers avic_vapic_bar, avic_backing_page, avic_logical_id, + * avic_physical_id. + */ + WARN_ON(svm->vmcb01.ptr->control.int_ctl & AVIC_ENABLE_MASK); + + /* Copied from vmcb01. msrpm_base can be overwritten later. */ + svm->vmcb->control.nested_ctl = svm->vmcb01.ptr->control.nested_ctl; + svm->vmcb->control.iopm_base_pa = svm->vmcb01.ptr->control.iopm_base_pa; + svm->vmcb->control.msrpm_base_pa = svm->vmcb01.ptr->control.msrpm_base_pa; + + /* Done at vmrun: asid. */ + + /* Also overwritten later if necessary. */ + svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING; + /* nested_cr3. */ if (nested_npt_enabled(svm)) nested_svm_init_mmu_context(&svm->vcpu); -- 2.50.1