From 7c3ecfcd31936e85aa6eb90156d07308b899a76f 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 6a523df..366147f 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); -- 2.7.4