From: Maxim Levitsky <mlevitsk@redhat.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Joerg Roedel <joro@8bytes.org>
Cc: kvm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 08/10] KVM: SVM: WARN if KVM attempts to create AVIC backing page with user APIC
Date: Thu, 05 Oct 2023 15:52:16 +0300 [thread overview]
Message-ID: <1d9377235ada012bc09e1864c4ef7522b8ef02fd.camel@redhat.com> (raw)
In-Reply-To: <20230815213533.548732-9-seanjc@google.com>
У вт, 2023-08-15 у 14:35 -0700, Sean Christopherson пише:
> WARN if KVM attempts to allocate a vCPU's AVIC backing page without an
> in-kernel local APIC. avic_init_vcpu() bails early if the APIC is not
> in-kernel, and KVM disallows enabling an in-kernel APIC after vCPUs have
> been created, i.e. it should be impossible to reach
> avic_init_backing_page() without the vAPIC being allocated.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> arch/x86/kvm/svm/avic.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index 522feaa711b4..3b2d00d9ca9b 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -300,7 +300,7 @@ static int avic_init_backing_page(struct kvm_vcpu *vcpu)
> return 0;
> }
>
> - if (!vcpu->arch.apic->regs)
> + if (WARN_ON_ONCE(!vcpu->arch.apic->regs))
> return -EINVAL;
>
> if (kvm_apicv_activated(vcpu->kvm)) {
As I said I prefer this to be folded with patch that adds the avic_init_backing_page().
Best regards,
Maxim Levitsky
next prev parent reply other threads:[~2023-10-05 12:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-15 21:35 [PATCH 00/10] VM: SVM: Honor KVM_MAX_VCPUS when AVIC is enabled Sean Christopherson
2023-08-15 21:35 ` [PATCH 01/10] KVM: SVM: Drop pointless masking of default APIC base when setting V_APIC_BAR Sean Christopherson
2023-10-05 12:49 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 02/10] KVM: SVM: Use AVIC_HPA_MASK when initializing vCPU's Physical ID entry Sean Christopherson
2023-10-05 12:49 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 03/10] KVM: SVM: Drop pointless masking of kernel page pa's with "AVIC's" HPA mask Sean Christopherson
2023-10-05 12:50 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 04/10] KVM: SVM: Add helper to deduplicate code for getting AVIC backing page Sean Christopherson
2023-10-05 12:50 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 05/10] KVM: SVM: Drop vcpu_svm's pointless avic_backing_page field Sean Christopherson
2023-10-05 12:50 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 06/10] iommu/amd: KVM: SVM: Use pi_desc_addr to derive ga_root_ptr Sean Christopherson
2023-09-28 17:29 ` Joao Martins
2023-10-05 12:50 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 07/10] KVM: SVM: Inhibit AVIC if ID is too big instead of rejecting vCPU creation Sean Christopherson
2023-10-05 12:51 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 08/10] KVM: SVM: WARN if KVM attempts to create AVIC backing page with user APIC Sean Christopherson
2023-10-05 12:52 ` Maxim Levitsky [this message]
2023-08-15 21:35 ` [PATCH 09/10] KVM: SVM: Drop redundant check in AVIC code on ID during vCPU creation Sean Christopherson
2023-10-05 12:58 ` Maxim Levitsky
2023-08-15 21:35 ` [PATCH 10/10] KVM: SVM: Rename "avic_physical_id_cache" to "avic_physical_id_entry" Sean Christopherson
2023-10-05 12:59 ` Maxim Levitsky
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