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From: Alexandru Stefan ISAILA <aisaila@bitdefender.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: "andrew.cooper3@citrix.com" <andrew.cooper3@citrix.com>,
	"boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
	"rcojocaru@bitdefender.com" <rcojocaru@bitdefender.com>,
	"suravee.suthikulpanit@amd.com" <suravee.suthikulpanit@amd.com>
Subject: [SVM] Adding page access bits
Date: Thu, 10 May 2018 12:59:51 +0000	[thread overview]
Message-ID: <1525957212.27235.13.camel@bitdefender.com> (raw)

Hello,

We want to add the page access functionality to the SVM code. We have
been trying to add 4 bits in the pte but all seem to be taken.

Is there a way to accommodate them in the 24 bit flag mask?

I think it can be done by moving the 4 protection key field bits from
22:19 to 23:30 so we can have the 19:16 for access. Not sure if bit 23
is clear

Any thoughts on this matter are appreciated.

Thanks,
Alex

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             reply	other threads:[~2018-05-10 13:00 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-10 12:59 Alexandru Stefan ISAILA [this message]
2018-05-10 13:07 ` [SVM] Adding page access bits Andrew Cooper

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