linux-kernel - Re: [PATCH 06/10] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page

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Message-ID: <bdb99bea-9e5e-951e-3016-4acd162c619e@redhat.com>
Date:   Thu, 12 Apr 2018 16:38:39 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     KarimAllah Ahmed <karahmed@...zon.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     hpa@...or.com, jmattson@...gle.com, mingo@...hat.com,
        rkrcmar@...hat.com, tglx@...utronix.de
Subject: Re: [PATCH 06/10] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual
 APIC page

On 21/02/2018 18:47, KarimAllah Ahmed wrote:
> +
> +		if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->virtual_apic_page_addr), map))
> +			vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, gfn_to_gpa(map->pfn));

This should in principle be pfn_to_hpa.  However, pfn_to_hpa is unused;
let's just remove it and do "<< PAGE_SHIFT".  Unlike gfn_to_gpa, where
in principle the shift could be different, pfn_to_hpa is *by definition*
a shift left by PAGE_SHIFT.

Paolo