From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
Cc: Matt Fleming
<matt-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>,
Linux EFI <linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>,
Jiri Kosina <jkosina-AlSwsSmVLrQ@public.gmane.org>,
X86-ML <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>
Subject: Re: [PATCH 4/4] x86, efi: Map runtime services 1:1
Date: Thu, 06 Jun 2013 12:38:10 -0700 [thread overview]
Message-ID: <51B0E522.4070005@zytor.com> (raw)
In-Reply-To: <20130606193612.GM20972-fF5Pk5pvG8Y@public.gmane.org>
On 06/06/2013 12:36 PM, Borislav Petkov wrote:
> On Thu, Jun 06, 2013 at 12:28:20PM -0700, H. Peter Anvin wrote:
>> Or we could materialize mappings for this specific PGD. However,
>> adding a read of %cr3 in __do_page_fault sounds expensive.
>
> Yes, I think we want to make sure all mappings are there when we do an
> EFI runtime call so that we never #PF while it executes.
>
> Matt mentioned on IRC that the it could be that his EFI runtime is
> referencing EFI_RESERVED area which we don't map. However, we need to
> confirm/disprove that first, as it is currently only a hunch.
If it is true, then maybe a #PF handler which materializes mappings on
demand might be the right thing to do.
Again, it would be interesting to stop a WinX VM in the process of doing
an EFI call and see exactly what it has set up in its page tables.
-hpa
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Matt Fleming <matt@console-pimps.org>,
Linux EFI <linux-efi@vger.kernel.org>,
Matthew Garrett <mjg59@srcf.ucam.org>,
Jiri Kosina <jkosina@suse.cz>, X86-ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, Borislav Petkov <bp@suse.de>
Subject: Re: [PATCH 4/4] x86, efi: Map runtime services 1:1
Date: Thu, 06 Jun 2013 12:38:10 -0700 [thread overview]
Message-ID: <51B0E522.4070005@zytor.com> (raw)
In-Reply-To: <20130606193612.GM20972@pd.tnic>
On 06/06/2013 12:36 PM, Borislav Petkov wrote:
> On Thu, Jun 06, 2013 at 12:28:20PM -0700, H. Peter Anvin wrote:
>> Or we could materialize mappings for this specific PGD. However,
>> adding a read of %cr3 in __do_page_fault sounds expensive.
>
> Yes, I think we want to make sure all mappings are there when we do an
> EFI runtime call so that we never #PF while it executes.
>
> Matt mentioned on IRC that the it could be that his EFI runtime is
> referencing EFI_RESERVED area which we don't map. However, we need to
> confirm/disprove that first, as it is currently only a hunch.
If it is true, then maybe a #PF handler which materializes mappings on
demand might be the right thing to do.
Again, it would be interesting to stop a WinX VM in the process of doing
an EFI call and see exactly what it has set up in its page tables.
-hpa
next prev parent reply other threads:[~2013-06-06 19:38 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-02 12:56 [PATCH 0/4] EFI 1:1 mapping Borislav Petkov
2013-06-02 12:56 ` Borislav Petkov
[not found] ` <1370177770-26661-1-git-send-email-bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
2013-06-02 12:56 ` [PATCH 1/4] efi: Convert runtime services function ptrs Borislav Petkov
2013-06-02 12:56 ` Borislav Petkov
2013-06-06 10:07 ` Matt Fleming
[not found] ` <20130606100745.GF30420-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-11 6:49 ` Matt Fleming
2013-06-11 6:49 ` Matt Fleming
[not found] ` <20130611064912.GG31198-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-11 9:33 ` Borislav Petkov
2013-06-11 9:33 ` Borislav Petkov
2013-06-02 12:56 ` [PATCH 2/4] x86, cpa: Map in an arbitrary pgd Borislav Petkov
2013-06-02 12:56 ` Borislav Petkov
[not found] ` <1370177770-26661-3-git-send-email-bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
2013-06-06 10:22 ` Matt Fleming
2013-06-06 10:22 ` Matt Fleming
[not found] ` <20130606102233.GG30420-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-06 13:24 ` Borislav Petkov
2013-06-06 13:24 ` Borislav Petkov
2013-06-06 13:30 ` Matt Fleming
[not found] ` <20130606133023.GJ30420-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-06 13:33 ` Borislav Petkov
2013-06-06 13:33 ` Borislav Petkov
2013-06-02 12:56 ` [PATCH 3/4] x86, efi: Add an efi= kernel command line parameter Borislav Petkov
2013-06-02 12:56 ` Borislav Petkov
[not found] ` <1370177770-26661-4-git-send-email-bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
2013-06-04 12:18 ` Borislav Petkov
2013-06-04 12:18 ` Borislav Petkov
2013-06-06 10:42 ` Matt Fleming
2013-06-06 10:42 ` Matt Fleming
[not found] ` <20130606104224.GH30420-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-06 13:26 ` Borislav Petkov
2013-06-06 13:26 ` Borislav Petkov
[not found] ` <20130606132603.GD20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 13:36 ` Matt Fleming
2013-06-06 13:36 ` Matt Fleming
2013-06-06 17:50 ` Matthew Garrett
2013-06-06 17:50 ` Matthew Garrett
[not found] ` <20130606175052.GA1285-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-06 18:51 ` Borislav Petkov
2013-06-06 18:51 ` Borislav Petkov
[not found] ` <20130606185140.GK20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 19:35 ` Matthew Garrett
2013-06-06 19:35 ` Matthew Garrett
[not found] ` <20130606193548.GA2946-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-06 19:41 ` Borislav Petkov
2013-06-06 19:41 ` Borislav Petkov
[not found] ` <20130606194134.GN20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 19:54 ` Matthew Garrett
2013-06-06 19:54 ` Matthew Garrett
2013-06-06 20:07 ` Borislav Petkov
[not found] ` <20130606200705.GO20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 20:18 ` Matthew Garrett
2013-06-06 20:18 ` Matthew Garrett
2013-06-06 20:27 ` Borislav Petkov
[not found] ` <20130606202717.GP20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 20:30 ` Matthew Garrett
2013-06-06 20:30 ` Matthew Garrett
[not found] ` <20130606203057.GA4237-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-06 20:44 ` Borislav Petkov
2013-06-06 20:44 ` Borislav Petkov
[not found] ` <20130606204410.GQ20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 20:50 ` Matthew Garrett
2013-06-06 20:50 ` Matthew Garrett
[not found] ` <20130606205057.GA4363-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-06 21:02 ` Borislav Petkov
2013-06-06 21:02 ` Borislav Petkov
[not found] ` <20130606210218.GR20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 21:03 ` Matthew Garrett
2013-06-06 21:03 ` Matthew Garrett
2013-06-02 12:56 ` [PATCH 4/4] x86, efi: Map runtime services 1:1 Borislav Petkov
2013-06-02 12:56 ` Borislav Petkov
[not found] ` <1370177770-26661-5-git-send-email-bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>
2013-06-06 13:14 ` Matt Fleming
2013-06-06 13:14 ` Matt Fleming
[not found] ` <20130606131439.GI30420-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-06 13:29 ` Borislav Petkov
2013-06-06 13:29 ` Borislav Petkov
[not found] ` <20130606132908.GE20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 15:58 ` Borislav Petkov
2013-06-06 15:58 ` Borislav Petkov
2013-06-06 19:28 ` H. Peter Anvin
[not found] ` <51B0E2D4.3040007-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-06-06 19:36 ` Borislav Petkov
2013-06-06 19:36 ` Borislav Petkov
[not found] ` <20130606193612.GM20972-fF5Pk5pvG8Y@public.gmane.org>
2013-06-06 19:38 ` H. Peter Anvin [this message]
2013-06-06 19:38 ` H. Peter Anvin
[not found] ` <51B0E522.4070005-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-06-10 12:55 ` Borislav Petkov
2013-06-10 12:55 ` Borislav Petkov
2013-06-02 22:56 ` [PATCH 0/4] EFI 1:1 mapping Matthew Garrett
[not found] ` <20130602225620.GA5496-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-03 8:11 ` Borislav Petkov
2013-06-03 8:11 ` Borislav Petkov
[not found] ` <20130603081148.GB13607-K5JNixvcfoxupOikMc4+xw@public.gmane.org>
2013-06-03 14:27 ` James Bottomley
2013-06-03 14:27 ` James Bottomley
2013-06-03 14:30 ` Matthew Garrett
2013-06-03 14:30 ` Matthew Garrett
2013-06-03 14:38 ` James Bottomley
2013-06-03 15:21 ` Matthew Garrett
2013-06-03 15:21 ` Matthew Garrett
2013-06-03 16:18 ` James Bottomley
2013-06-03 16:24 ` Matthew Garrett
2013-06-03 16:24 ` Matthew Garrett
[not found] ` <20130603162435.GA22563-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-03 16:35 ` James Bottomley
2013-06-03 16:35 ` James Bottomley
2013-06-03 16:42 ` Matthew Garrett
2013-06-03 16:42 ` Matthew Garrett
[not found] ` <20130603164237.GA23146-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-03 18:05 ` James Bottomley
2013-06-03 18:05 ` James Bottomley
2013-06-03 18:11 ` Matthew Garrett
2013-06-03 18:11 ` Matthew Garrett
[not found] ` <20130603181110.GA25060-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-03 21:19 ` James Bottomley
2013-06-03 21:19 ` James Bottomley
2013-06-03 21:29 ` Matthew Garrett
2013-06-03 21:29 ` Matthew Garrett
2014-02-10 3:59 ` Linux, UEFI, and Chromebooks (was RE: [PATCH 0/4] EFI 1:1 mapping) Yuhong Bao
2014-02-10 3:59 ` Yuhong Bao
2013-06-03 14:32 ` [PATCH 0/4] EFI 1:1 mapping Matthew Garrett
[not found] ` <20130603143252.GB20252-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2013-06-03 14:54 ` Matt Fleming
2013-06-03 14:54 ` Matt Fleming
[not found] ` <20130603145412.GJ2004-HNK1S37rvNbeXh+fF434Mdi2O/JbrIOy@public.gmane.org>
2013-06-04 8:15 ` Borislav Petkov
2013-06-04 8:15 ` Borislav Petkov
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