Re: [Xen-devel] [PATCH v8 16/20] xenctx: Fix handling of !guest_protected_mode

[Don Slutz <dslutz@xxxxxxxxxxx>]

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



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