From mboxrd@z Thu Jan  1 00:00:00 1970
From: Don Slutz <dslutz@verizon.com>
Subject: Re: [PATCH v8 16/20] xenctx: Fix handling of
	!guest_protected_mode
Date: Tue, 01 Apr 2014 14:35:01 -0400
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To: Ian Campbell <Ian.Campbell@citrix.com>, Don Slutz <dslutz@verizon.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Jan Beulich <jbeulich@suse.com>, xen-devel@lists.xen.org
List-Id: xen-devel@lists.xenproject.org

On 04/01/14 10:14, Ian Campbell wrote:
> On Thu, 2014-03-27 at 15:05 -0400, Don Slutz wrote:
>> Start with adding the code to the 64 bit path that the 32 bit path
>> has.
> One for people who keep x86 in their brains, is it possible for a
> processor to be in 64-bit non-protected mode?

Not in the way the question is asked.  This case is:

Breakpoint 1, instr_pointer (ctx=ctx@entry=0x7fffffffd040) at xenctx.c:413
413     {
(gdb) p ctxt_word_size
$1 = 8
(gdb) p guest_word_size
$2 = 4

I.E. the context is in 64, the guest is not.

This is why:

void print_ctx(vcpu_guest_context_any_t *ctx)
{
     if (ctxt_word_size == 4)
         print_ctx_32(&ctx->x32);
     else if (guest_word_size == 4)
         print_ctx_32on64(&ctx->x64);
     else
         print_ctx_64(&ctx->x64);
}

exists.

   -Don Slutz