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Date:      Mon, 06 Mar 2017 02:36:42 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-virtualization@FreeBSD.org
Subject:   [Bug 211746] [Hyper-V] UEFI VM can't boot from the iso installation disk
Message-ID:  <bug-211746-27103-IbJLTgkX8R@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-211746-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-211746-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211746

--- Comment #22 from Dexuan Cui <decui@microsoft.com> ---
 (In reply to commit-hook from comment #21)
Some people reported the fix was breaking their hosts.

Chris H is the first person to dump the EFI memory map to me: on the host t=
here
is a 1MB LoaderData memory range, which splits the big Conventional Memory
range into a small one (15MB) and a big one: the small one is too small to =
hold
the staging area.

Marcel did remind me of this:
https://reviews.freebsd.org/D9686?id=3D25414#inline-56907
But unluckily I didn't realize the importance, since I didn't really have
access to an EFI-boot physical FreeBSD host and FreeBSD VM running on Hyper=
-V
didn't expose the issue.

I'll attach the screen shot of Chris's mem map FYI.

And I'm going to make a patch shortly.

--=20
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