Re: [RFC PATCH 1/3] KVM: nSVM: move nested_vmcb_check_cr3_cr4 logic in nested_vmcb_valid_sregs
From: Maxim Levitsky <hidden>
Date: 2021-09-12 10:36:31
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lkml
On Fri, 2021-09-03 at 12:20 +0200, Emanuele Giuseppe Esposito wrote:
quoted hunk ↗ jump to hunk
Inline nested_vmcb_check_cr3_cr4 as it is not called by anyone else. Doing so simplifies next patches. Signed-off-by: Emanuele Giuseppe Esposito <redacted> --- arch/x86/kvm/svm/nested.c | 35 +++++++++++++---------------------- 1 file changed, 13 insertions(+), 22 deletions(-)diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index e5515477c30a..d2fe65e2a7a4 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c@@ -260,27 +260,6 @@ static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu, return true; } -static bool nested_vmcb_check_cr3_cr4(struct kvm_vcpu *vcpu, - struct vmcb_save_area *save) -{ - /* - * These checks are also performed by KVM_SET_SREGS, - * except that EFER.LMA is not checked by SVM against - * CR0.PG && EFER.LME. - */ - if ((save->efer & EFER_LME) && (save->cr0 & X86_CR0_PG)) { - if (CC(!(save->cr4 & X86_CR4_PAE)) || - CC(!(save->cr0 & X86_CR0_PE)) || - CC(kvm_vcpu_is_illegal_gpa(vcpu, save->cr3))) - return false; - } - - if (CC(!kvm_is_valid_cr4(vcpu, save->cr4))) - return false; - - return true; -} - /* Common checks that apply to both L1 and L2 state. */ static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu, struct vmcb_save_area *save)@@ -302,7 +281,19 @@ static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu, if (CC(!kvm_dr6_valid(save->dr6)) || CC(!kvm_dr7_valid(save->dr7))) return false; - if (!nested_vmcb_check_cr3_cr4(vcpu, save)) + /* + * These checks are also performed by KVM_SET_SREGS, + * except that EFER.LMA is not checked by SVM against + * CR0.PG && EFER.LME. + */ + if ((save->efer & EFER_LME) && (save->cr0 & X86_CR0_PG)) { + if (CC(!(save->cr4 & X86_CR4_PAE)) || + CC(!(save->cr0 & X86_CR0_PE)) || + CC(kvm_vcpu_is_illegal_gpa(vcpu, save->cr3))) + return false; + } + + if (CC(!kvm_is_valid_cr4(vcpu, save->cr4))) return false; if (CC(!kvm_valid_efer(vcpu, save->efer)))
Reviewed-by: Maxim Levitsky <redacted> Best regards, Maxim Levitsky