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Date: Fri, 17 Jul 2015 04:31:14 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Andy Lutomirski <luto@...nel.org>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Cc: guangrong.xiao@...ux.intel.com, jroedel@...e.de, alex.williamson@...hat.com, ogerlitz@...lanox.com, amirv@...lanox.com Subject: Re: [PATCH 2/4] KVM: SVM: use NPT page attributes On 17/07/2015 02:35, Andy Lutomirski wrote: > >> Right now, NPT page attributes are not used, and the final page >> attribute depends solely on gPAT (which however is not synced >> correctly), the guest MTRRs and the guest page attributes. >> >> However, we can do better by mimicking what is done for VMX. >> In the absence of PCI passthrough, the guest PAT can be ignored >> and the page attributes can be just WB. If passthrough is being >> used, instead, keep respecting the guest PAT, and emulate the guest >> MTRRs through the PAT field of the nested page tables. >> >> The only snag is that WP memory cannot be emulated correctly, >> because Linux's default PAT setting only includes the other types. >> > > As of quite recently, Linux understands that the PAT has eight slots, > and we can probably give you WP. Do you want it? It doesn't really matter, it's mostly used in the firmware. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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