linux-kernel - Re: [PATCH 1/3] KVM: SVM: use NPT page attributes

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Date:	Tue, 7 Jul 2015 15:23:14 +0200
From:	Joerg Roedel <jroedel@...e.de>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	guangrong.xiao@...ux.intel.com, alex.williamson@...hat.com,
	ogerlitz@...lanox.com, amirv@...lanox.com
Subject: Re: [PATCH 1/3] KVM: SVM: use NPT page attributes

Hi Paolo,

On Tue, Jul 07, 2015 at 02:58:12PM +0200, Paolo Bonzini wrote:
> +static void svm_set_guest_pat(struct vcpu_svm *svm, u64 *g_pat)
> +{
> +	struct kvm_vcpu *vcpu = &svm->vcpu;
> +
> +	/* Unlike Intel, AMD takes the guest's CR0.CD into account.
> +	 *
> +	 * AMD doesn't have snooping control in the IOMMU, but if the guest

The AMD IOMMU has snooping control, its just called 'Force Coherent'
there. The AMD IOMMU driver always sets the FC bit in the page tables.


	Joerg

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