Public bug reported:
When I rebuild edk2_0~20150106.5c2d456b-1build1 in wily or sid, KVM-
accelerated arm64 VMs hang before displaying any console output. I
bisected this down to a change in gcc (see below).
Note that this does not impact fully emulated instances. That is, if I
drop '-enable-kvm' and change '-cpu host' to '-cpu cortex-a57', it boots
fine.
Here's the gcc changeset that introduced the issue:
>From 470d5bb5a2aba04db8d9d9dce0c5a3d5efe85882 Mon Sep 17 00:00:00 2001
From: thopre01 <thopre01@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 23 May 2014 03:33:28 +0000
Subject: [PATCH] 2014-05-23 Thomas Preud'homme <thomas.preudho...@arm.com>
PR tree-optimization/54733
gcc/
* tree-ssa-math-opts.c (nop_stats): New "bswap_stats" structure.
(CMPNOP): Define.
(find_bswap_or_nop_load): New.
(find_bswap_1): Renamed to ...
(find_bswap_or_nop_1): This. Also add support for memory source.
(find_bswap): Renamed to ...
(find_bswap_or_nop): This. Also add support for memory source and
detection of bitwise operations equivalent to load in host endianness.
(execute_optimize_bswap): Likewise. Also move its leading comment back
in place and split statement transformation into ...
(bswap_replace): This.
gcc/testsuite
* gcc.dg/optimize-bswapdi-3.c: New test to check extension of bswap
optimization to support memory sources and bitwise operations
equivalent to load in host endianness.
* gcc.dg/optimize-bswaphi-1.c: Likewise.
* gcc.dg/optimize-bswapsi-2.c: Likewise.
* gcc.c-torture/execute/bswap-2.c: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@210843
138bc75d-0d04-0410-961f-82ee72b054a4
** Affects: edk2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1489560
Title:
qemu-efi: hangs in kvm mode when built w/ gcc-5
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