linux-kernel - Re: [PATCH v2 02/11] xen/hvmlite: Bootstrap HVMlite guest

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Message-ID: <571E219D.2090308@oracle.com>
Date:	Mon, 25 Apr 2016 09:54:37 -0400
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>, david.vrabel@...rix.com,
	konrad.wilk@...cle.com, xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org, roger.pau@...rix.com, mcgrof@...e.com
Subject: Re: [PATCH v2 02/11] xen/hvmlite: Bootstrap HVMlite guest

On 04/25/2016 09:47 AM, Borislav Petkov wrote:
> On Mon, Apr 25, 2016 at 09:21:27AM -0400, Boris Ostrovsky wrote:
>> I was following  Documentation/x86/boot.txt (plus comments in code preceding
>> those two routines) which I considered to be the API.
>>
>> We are supposed to come to startup_32 with paging off and %esi pointing to
>> boot_params. For 64-bit paging is on, %rsi points to zero-page.
> So the entry points which are ABI and the ones I believe you're talking
> about are in arch/x86/boot/compressed/head_64.S. But you have all this
> stuff laid out in arch/x86/xen/ and I don't see you using the entry
> points in boot/compressed/. It looks more to me that you're using the
> ones in arch/x86/kernel/head_{32,64}.S after decompression.

Yes, those. We don't do anything in arch/x86/boot/compressed, hypervisor 
loads vmlinuX at entry point specified by XEN_ELFNOTE_PHYS32_ENTRY 
(which is hvmlite_start_xen).


-boris