From mboxrd@z Thu Jan  1 00:00:00 1970
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Subject: Re: HVMlite ABI specification DRAFT A
Date: Thu, 4 Feb 2016 23:21:30 +0100
Message-ID: <20160204222130.GC3377@var.home>
References: <56B38EDE.5090700@citrix.com> <20160204190915.GB3377@var.home>
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To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Tim Deegan <tim@xen.org>, Paul Durrant <paul.durrant@citrix.com>, David Vrabel <david.vrabel@citrix.com>, Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xenproject.org>, Roger Pau =?iso-8859-1?Q?Monn=E9?= <roger.pau@citrix.com>
List-Id: xen-devel@lists.xenproject.org

Boris Ostrovsky, on Thu 04 Feb 2016 14:18:46 -0500, wrote:
> On 02/04/2016 02:09 PM, Samuel Thibault wrote:
> >Roger Pau Monn=E9, on Thu 04 Feb 2016 18:48:14 +0100, wrote:
> >>     struct hvm_start_info {
> >>     #define HVM_START_MAGIC_VALUE 0x336ec578
> >>         uint32_t magic;             /* Contains the magic value 0x336e=
c578       */
> >>                                     /* ("xEn3" with the 0x80 bit of th=
e "E" set).*/
> >>         uint32_t flags;             /* SIF_xxx flags.                 =
           */
> >>         uint32_t cmdline_paddr;     /* Physical address of the command=
 line.     */
> >>         uint32_t nr_modules;        /* Number of modules passed to the=
 kernel.   */
> >>         uint32_t modlist_paddr;     /* Physical address of an array of=
           */
> >>                                     /* hvm_modlist_entry.             =
           */
> >>     };
> >Mmm, don't we also need a description of the initial page table, so that
> >the guest kernel knows which part of the memory it shouldn't use until
> >having initialized its own page table?  Or is there none in the guest
> >physical memory at startup of HVMlite mode?
> =

> We start with paging off.

So a 32bit hypervisor *has* to use segmentation to protect itself from
domU?

Samuel