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Re: [Xen-devel] [PATCH 4/4] x86: check for multiboot{1, 2} header presence
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 19 Jun 2019 12:23:04 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Wed, 19 Jun 2019 11:23:24 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 19/06/2019 12:20, Roger Pau Monné wrote:
> On Wed, Jun 19, 2019 at 12:11:43PM +0100, Andrew Cooper wrote:
>> On 19/06/2019 12:02, Roger Pau Monne wrote:
>>> After building the hypervisor binary. Note that the check is performed
>>> by searching for the magic header value at the start of the binary.
>>>
>>> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>> ---
>>> Cc: Jan Beulich <jbeulich@xxxxxxxx>
>>> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>> Cc: Wei Liu <wl@xxxxxxx>
>>> ---
>>> xen/arch/x86/Makefile | 3 +++
>>> 1 file changed, 3 insertions(+)
>>>
>>> diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
>>> index 8a8d8f060f..9bb3bf6e6c 100644
>>> --- a/xen/arch/x86/Makefile
>>> +++ b/xen/arch/x86/Makefile
>>> @@ -102,6 +102,9 @@
>>> syms-warn-dup-$(CONFIG_SUPPRESS_DUPLICATE_SYMBOL_WARNINGS) :=
>>> $(TARGET): $(TARGET)-syms $(efi-y) boot/mkelf32
>>> ./boot/mkelf32 $(notes_phdrs) $(TARGET)-syms $(TARGET)
>>> $(XEN_IMG_OFFSET) \
>>> `$(NM) $(TARGET)-syms | sed -ne 's/^\([^ ]*\) .
>>> __2M_rwdata_end$$/0x\1/p'`
>>> + # Check for multiboot{1,2} headers
>>> + od -t x4 -N 8192 $(TARGET) | grep 1badb002 > /dev/null
>>> + od -t x4 -N 32768 $(TARGET) | grep e85250d6 > /dev/null
>> Neat solution. Is `grep -q` portable ?
> It is, but grep -q closes the pipe on the first match, and then od
> will return an error. Note sure whether there's a way to workaround
> this issue, but I think the above is simple enough.
In which case, Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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