From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756006AbeDZNfV (ORCPT ); Thu, 26 Apr 2018 09:35:21 -0400 Received: from foss.arm.com ([217.140.101.70]:53780 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751713AbeDZNfO (ORCPT ); Thu, 26 Apr 2018 09:35:14 -0400 Subject: Re: [PATCH v2 08/17] kvm: arm/arm64: Prepare for VM specific stage2 translations To: Suzuki K Poulose , linux-arm-kernel@lists.infradead.org Cc: ard.biesheuvel@linaro.org, kvm@vger.kernel.org, marc.zyngier@arm.com, catalin.marinas@arm.com, punit.agrawal@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, kristina.martsenko@arm.com, pbonzini@redhat.com, kvmarm@lists.cs.columbia.edu References: <1522156531-28348-1-git-send-email-suzuki.poulose@arm.com> <1522156531-28348-9-git-send-email-suzuki.poulose@arm.com> From: Julien Grall Message-ID: <7f67fca2-b936-25d9-0fe8-aece1fadafdc@arm.com> Date: Thu, 26 Apr 2018 14:35:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <1522156531-28348-9-git-send-email-suzuki.poulose@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Suzuki, On 27/03/18 14:15, Suzuki K Poulose wrote: > Right now the stage2 page table for a VM is hard coded, assuming > an IPA of 40bits. As we are about to add support for per VM IPA, > prepare the stage2 page table helpers to accept the kvm instance > to make the right decision for the VM. No functional changes. > > Cc: Marc Zyngier > Cc: Christoffer Dall > Signed-off-by: Suzuki K Poulose > --- > arch/arm/include/asm/kvm_arm.h | 3 +- > arch/arm/include/asm/kvm_mmu.h | 15 +++- > arch/arm/include/asm/stage2_pgtable.h | 42 ++++----- > arch/arm64/include/asm/kvm_mmu.h | 7 +- > arch/arm64/include/asm/stage2_pgtable-nopmd.h | 18 ++-- > arch/arm64/include/asm/stage2_pgtable-nopud.h | 16 ++-- > arch/arm64/include/asm/stage2_pgtable.h | 49 ++++++----- > virt/kvm/arm/arm.c | 2 +- > virt/kvm/arm/mmu.c | 119 +++++++++++++------------- > virt/kvm/arm/vgic/vgic-kvm-device.c | 2 +- > 10 files changed, 148 insertions(+), 125 deletions(-) > > diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h > index 3ab8b37..c3f1f9b 100644 > --- a/arch/arm/include/asm/kvm_arm.h > +++ b/arch/arm/include/asm/kvm_arm.h > @@ -133,8 +133,7 @@ > * space. > */ > #define KVM_PHYS_SHIFT (40) > -#define KVM_PHYS_SIZE (_AC(1, ULL) << KVM_PHYS_SHIFT) > -#define KVM_PHYS_MASK (KVM_PHYS_SIZE - _AC(1, ULL)) I assume you are moving them to kvm_mmu.h in order to match the arm64 side, right? If so, would not it make sense to make KVM_PHYS_SHIFT with it? [...] > diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h > index 7faed6e..594c4e6 100644 > --- a/arch/arm64/include/asm/kvm_mmu.h > +++ b/arch/arm64/include/asm/kvm_mmu.h > @@ -134,8 +134,11 @@ static inline unsigned long __kern_hyp_va(unsigned long v) > * We currently only support a 40bit IPA. > */ > #define KVM_PHYS_SHIFT (40) > -#define KVM_PHYS_SIZE (1UL << KVM_PHYS_SHIFT) > -#define KVM_PHYS_MASK (KVM_PHYS_SIZE - 1UL) > + > +#define kvm_phys_shift(kvm) KVM_PHYS_SHIFT > +#define kvm_phys_size(kvm) (_AC(1, ULL) << kvm_phys_shift(kvm)) NIT: is the _AC(...) necessary? It does not look like this function is going to be usable in assembly. > +#define kvm_phys_mask(kvm) (kvm_phys_size(kvm) - _AC(1, ULL)) Same here. -- Julien Grall