From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: KarimAllah Ahmed <karahmed@amazon.de>,
x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, hpa@zytor.com, jmattson@google.com,
mingo@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de
Subject: Re: [PATCH 06/10] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page
Date: Thu, 12 Apr 2018 22:23:05 +0200 [thread overview]
Message-ID: <fdc94c1f-fb39-edc2-b7eb-cea87a69023d@redhat.com> (raw)
In-Reply-To: <20180412175742.GA14534@linux.intel.com>
On 12/04/2018 19:57, Sean Christopherson wrote:
> On Thu, Apr 12, 2018 at 04:38:39PM +0200, Paolo Bonzini wrote:
>> 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.
>
> Any reason not to use PFN_PHYS instead of the handcoded shift?
That works too of course. It's just not used much (or at all?) in KVM.
Paolo
next prev parent reply other threads:[~2018-04-12 20:23 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-21 17:47 [PATCH 00/10] KVM/X86: Handle guest memory that does not have a struct page KarimAllah Ahmed
2018-02-21 17:47 ` [PATCH 01/10] X86/nVMX: handle_vmon: Read 4 bytes from guest memory instead of map->read->unmap sequence KarimAllah Ahmed
2018-02-21 17:47 ` [PATCH 02/10] X86/nVMX: handle_vmptrld: Copy the VMCS12 directly from guest memory instead of map->copy->unmap sequence KarimAllah Ahmed
2018-02-21 17:47 ` [PATCH 03/10] X86/nVMX: Update the PML table without mapping and unmapping the page KarimAllah Ahmed
2018-02-23 2:02 ` kbuild test robot
2018-04-12 15:03 ` Paolo Bonzini
2018-02-21 17:47 ` [PATCH 04/10] KVM: Introduce a new guest mapping API KarimAllah Ahmed
2018-02-23 1:27 ` kbuild test robot
2018-02-23 1:37 ` kbuild test robot
2018-02-23 23:48 ` Raslan, KarimAllah
2018-04-12 14:33 ` Paolo Bonzini
2018-02-21 17:47 ` [PATCH 05/10] KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap KarimAllah Ahmed
2018-02-23 21:36 ` Konrad Rzeszutek Wilk
2018-02-23 23:45 ` Raslan, KarimAllah
2018-04-12 14:36 ` Paolo Bonzini
2018-02-21 17:47 ` [PATCH 06/10] KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page KarimAllah Ahmed
2018-04-12 14:38 ` Paolo Bonzini
2018-04-12 17:57 ` Sean Christopherson
2018-04-12 20:23 ` Paolo Bonzini [this message]
2018-02-21 17:47 ` [PATCH 07/10] KVM/nVMX: Use kvm_vcpu_map when mapping the posted interrupt descriptor table KarimAllah Ahmed
2018-04-12 14:39 ` Paolo Bonzini
2018-02-21 17:47 ` [PATCH 08/10] KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated KarimAllah Ahmed
2018-02-22 2:56 ` Raslan, KarimAllah
2018-02-21 17:47 ` [PATCH 09/10] KVM/X86: hyperv: Use kvm_vcpu_map in synic_clear_sint_msg_pending KarimAllah Ahmed
2018-02-21 17:47 ` [PATCH 10/10] KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver_msg KarimAllah Ahmed
2018-03-01 15:24 ` [PATCH 00/10] KVM/X86: Handle guest memory that does not have a struct page Raslan, KarimAllah
2018-03-01 17:51 ` Jim Mattson
2018-03-02 17:40 ` Paolo Bonzini
2018-04-12 14:59 ` Paolo Bonzini
2018-04-12 21:25 ` Raslan, KarimAllah
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