From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>,
xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH v2] x86: defer not-present segment checks
Date: Mon, 10 Oct 2016 11:05:45 +0100 [thread overview]
Message-ID: <9aa9ac3c-7ca7-4c8f-8181-207e1eb842fc@citrix.com> (raw)
In-Reply-To: <57FB83B702000078001160DD@prv-mh.provo.novell.com>
On 10/10/16 11:04, Jan Beulich wrote:
> Following on from commits 5602e74c60 ("x86emul: correct loading of
> %ss") and bdb860d01c ("x86/HVM: correct segment register loading during
> task switch") the point of the non-.present checks needs to be refined:
> #NP (and its #SS companion), other than suggested by the various
> instruction pages in Intel's SDM, gets checked for only after all type
> and permission checks. The only checks getting done even later are the
> long mode specific ones for system descriptors (which we don't support
> yet) and 64-bit code segments (i.e. anything touching other than the
> attribute byte).
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
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prev parent reply other threads:[~2016-10-10 10:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-10 10:04 [PATCH v2] x86: defer not-present segment checks Jan Beulich
2016-10-10 10:05 ` Andrew Cooper [this message]
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