From: Anthony PERARD <anthony.perard@citrix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Wei Liu <wei.liu2@citrix.com>,
xen-devel@lists.xen.org
Subject: Re: [PATCH v4 01/14] libxc: Rework extra module initialisation
Date: Thu, 17 Mar 2016 16:24:06 +0000 [thread overview]
Message-ID: <20160317162406.GA27408@perard.uk.xensource.com> (raw)
In-Reply-To: <20160316000644.GG29495@char.us.oracle.com>
On Tue, Mar 15, 2016 at 08:06:44PM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Mar 14, 2016 at 05:55:36PM +0000, Anthony PERARD wrote:
> > This patch use xc_dom_alloc_segment() to allocate the memory space for the
> > ACPI modules and the SMBIOS modules. This is to replace the arbitrary
> > placement of 1MB after the hvmloader image.
>
> s/of/at/ ?
>
> Or are you rather staying that the memory for ACPI modules and such
> is offset by one 1MB after hvmloader image?
I was trying to translate this in to english:
*mstart_out = MKALIGN(elf->pend, MB_ALIGN) + (MB_ALIGN);
which came with that comment:
/* Want to place the modules 1Mb+change behind the loader image. */
[...]
Actually, the current situation before this patch would be, with every bios
compiled in, and with the use of acpi_firmware:
/-----------\ <- 0MB
| other |
| stuff |
+-----------+ <- 1MB
| hvmloader |
| binary |
+-----------| <- 3.8MB
| empty |
+-----------+ <- 4MB <- begining of memory used by perform_tests()
| ... |
+-----------+ <- 5MB
| ACPI DATA |
+-----------+ <- 5.4MB
| ... |
\-----------/ <- 8MB <- end of memory used by perform_tests()
I just tried to to use the options acpi_firmware, and that the result.
When hvmloader tried to load the extra acpi data, I have this:
Loading SeaBIOS ...
Creating MP tables ...
Loading ACPI ...
*** HVMLoader bug at util.c:460
*** HVMLoader crashed.
That the BUG_ON in mem_alloc(). I think it's trying to allocate memory of
size 0.
> > In later patches, while trying to load a firmware such as OVMF, the later
>
> .. what later patches? These ones? You may want to mention which ones.
Ok, I will. That would be "hvmloader: Load OVMF from modules" and previous
ones of the patch series.
> > could easily be loaded past the address 4MB (OVMF is a 2MB binary), but
>
> Why would it be loaded past 4MB? Why not in the space right after ACPI
> DSDT and such?
> > hvmloader use a range of memory from 4MB to 8MB to perform tests and in the
> > process, clear the memory, before loading the modules.
>
> s/clear/clears/
>
> >
> > Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
> > ---
> > Changes in V4:
> > - check that guest_addr_out have a reasonable value.
> >
> > New patch in V3.
> > ---
> > tools/libxc/xc_dom_hvmloader.c | 131 ++++++++++++-----------------------------
> > 1 file changed, 38 insertions(+), 93 deletions(-)
> >
> > diff --git a/tools/libxc/xc_dom_hvmloader.c b/tools/libxc/xc_dom_hvmloader.c
> > index 330d5e8..7cf5854 100644
> > --- a/tools/libxc/xc_dom_hvmloader.c
> > +++ b/tools/libxc/xc_dom_hvmloader.c
[...]
> >
> > - error_out:
> > - free(entries);
> > + rc = module_init_one(dom, &dom->acpi_module, "acpi module");
> > + if ( rc ) goto err;
> > + rc = module_init_one(dom, &dom->smbios_module, "smbios module");
> > + if ( rc ) goto err;
>
> You can't be that code thought. That is some nice deletion of code.
>
> Now is this safe for migration?
> I presume so since this is all E820_RESERVED righT? No funny business
> there?
The acpi module is moved to another location by hvmloader. I guess that the
same for the smbios module. So I think it's safe for migration, and it
does not change anything once hvmloader has finished.
--
Anthony PERARD
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next prev parent reply other threads:[~2016-03-17 16:24 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-14 17:55 [PATCH v4 00/14] Load BIOS via toolstack instead of been embedded in hvmloader Anthony PERARD
2016-03-14 17:55 ` [PATCH v4 01/14] libxc: Rework extra module initialisation Anthony PERARD
2016-03-16 0:06 ` Konrad Rzeszutek Wilk
2016-03-17 16:24 ` Anthony PERARD [this message]
2016-03-14 17:55 ` [PATCH v4 02/14] libxc: Prepare a start info structure for hvmloader Anthony PERARD
2016-03-16 0:18 ` Konrad Rzeszutek Wilk
2016-03-16 18:01 ` Boris Ostrovsky
2016-03-17 16:48 ` Anthony PERARD
2016-03-17 16:28 ` Anthony PERARD
2016-03-14 17:55 ` [PATCH v4 03/14] configure: #define SEABIOS_PATH and OVMF_PATH Anthony PERARD
2016-03-16 0:20 ` Konrad Rzeszutek Wilk
2016-04-08 13:38 ` Wei Liu
2016-03-14 17:55 ` [PATCH v4 04/14] firmware/makefile: install BIOS blob Anthony PERARD
2016-03-16 0:26 ` Konrad Rzeszutek Wilk
2016-03-16 8:54 ` Dario Faggioli
2016-03-16 8:56 ` Konrad Rzeszutek Wilk
2016-03-17 16:58 ` Anthony PERARD
2016-03-17 17:37 ` Doug Goldstein
2016-03-17 18:33 ` Anthony PERARD
2016-03-18 21:11 ` Jim Fehlig
2016-03-19 0:43 ` Doug Goldstein
2016-04-18 14:31 ` Doug Goldstein
2016-04-19 13:11 ` Stefano Stabellini
2016-03-14 17:55 ` [PATCH v4 05/14] libxl: Load guest BIOS from file Anthony PERARD
2016-03-16 0:53 ` Konrad Rzeszutek Wilk
2016-03-16 9:27 ` Dario Faggioli
2016-03-17 17:24 ` Anthony PERARD
2016-03-14 17:55 ` [PATCH v4 06/14] xen: Move the hvm_start_info C representation from libxc to public/xen.h Anthony PERARD
2016-03-15 8:09 ` Jan Beulich
2016-03-16 0:59 ` Konrad Rzeszutek Wilk
2016-03-16 1:00 ` Konrad Rzeszutek Wilk
2016-03-16 8:32 ` Jan Beulich
2016-03-21 17:04 ` Roger Pau Monné
2016-03-21 17:21 ` Jan Beulich
2016-03-14 17:55 ` [PATCH v4 07/14] hvmloader: Grab the hvm_start_info pointer Anthony PERARD
2016-03-16 1:07 ` Konrad Rzeszutek Wilk
2016-04-05 12:43 ` Jan Beulich
2016-03-14 17:55 ` [PATCH v4 08/14] hvmloader: Locate the BIOS blob Anthony PERARD
2016-03-16 1:14 ` Konrad Rzeszutek Wilk
2016-03-17 17:46 ` Anthony PERARD
2016-03-17 17:57 ` Konrad Rzeszutek Wilk
2016-03-18 7:34 ` Jan Beulich
2016-04-05 12:59 ` Jan Beulich
2016-04-05 14:05 ` Roger Pau Monné
2016-04-05 14:23 ` Jan Beulich
2016-04-07 15:10 ` Anthony PERARD
2016-04-07 15:30 ` Jan Beulich
2016-03-14 17:55 ` [PATCH v4 09/14] hvmloader: Check modules whereabouts in perform_tests Anthony PERARD
2016-03-16 1:23 ` Konrad Rzeszutek Wilk
2016-03-17 18:08 ` Anthony PERARD
2016-04-05 13:07 ` Jan Beulich
2016-03-14 17:55 ` [PATCH v4 10/14] hvmloader: Load SeaBIOS from hvm_start_info modules Anthony PERARD
2016-03-16 1:27 ` Konrad Rzeszutek Wilk
2016-03-16 1:27 ` Konrad Rzeszutek Wilk
2016-04-05 13:11 ` Jan Beulich
2016-03-14 17:55 ` [PATCH v4 11/14] hvmloader: Load OVMF from modules Anthony PERARD
2016-03-16 1:36 ` Konrad Rzeszutek Wilk
2016-04-05 13:16 ` Jan Beulich
2016-03-14 17:55 ` [PATCH v4 12/14] hvmloader: Specific bios_load function required Anthony PERARD
2016-03-16 1:38 ` Konrad Rzeszutek Wilk
2016-03-17 18:25 ` Anthony PERARD
2016-03-14 17:55 ` [PATCH v4 13/14] hvmloader: Always build-in SeaBIOS and OVMF loader Anthony PERARD
2016-03-14 17:55 ` [PATCH v4 14/14] configure: do not depend on SEABIOS_PATH or OVMF_PATH Anthony PERARD
2016-03-16 1:40 ` Konrad Rzeszutek Wilk
2016-04-08 13:38 ` Wei Liu
2016-03-24 17:55 ` [PATCH v4 00/14] Load BIOS via toolstack instead of been embedded in hvmloader Jim Fehlig
2016-03-30 17:22 ` Jim Fehlig
2016-03-31 7:20 ` Jan Beulich
[not found] ` <56FCEBCD02000078000E19BF@suse.com>
2016-03-31 14:36 ` Jim Fehlig
2016-03-31 16:49 ` George Dunlap
2016-04-01 9:12 ` George Dunlap
2016-04-01 14:24 ` Konrad Rzeszutek Wilk
2016-04-01 20:06 ` Jim Fehlig
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