* CentOS 7 build warning, chacha20_avx512vl
@ 2018-03-25 18:50 Vbook A1
2018-03-25 21:17 ` Samuel Neves
0 siblings, 1 reply; 2+ messages in thread
From: Vbook A1 @ 2018-03-25 18:50 UTC (permalink / raw)
To: wireguard
Hello,
this is the build log of the latest "stable" WireGuard on the latest CentOS 7:
> -bash-4.2# make
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/main.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/noise.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/device.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/peer.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/timers.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/queueing.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/send.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/receive.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/socket.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/hashtables.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/allowedips.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/ratelimiter.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/cookie.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/netlink.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/curve25519.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/chacha20poly1305.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/blake2s.o
> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/chacha20-x86_64.o
> /dev/shm/WireGuard-0.0.20180304/src/crypto/chacha20-x86_64.o: warning: objtool: chacha20_avx512vl()+0x3f: can't find jump dest instruction at .text+0x2669
> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/poly1305-x86_64.o
> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/blake2s-x86_64.o
> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/curve25519-x86_64.o
> CC [M] /dev/shm/WireGuard-0.0.20180304/src/compat/siphash/siphash.o
> LD [M] /dev/shm/WireGuard-0.0.20180304/src/wireguard.o
> Building modules, stage 2.
> MODPOST 1 modules
> CC /dev/shm/WireGuard-0.0.20180304/src/wireguard.mod.o
> LD [M] /dev/shm/WireGuard-0.0.20180304/src/wireguard.ko
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/wg.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/config.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/show.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/terminal.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/ipc.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/mnlg.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/encoding.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/curve25519.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/setconf.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/genkey.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/showconf.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/pubkey.o
> CC /dev/shm/WireGuard-0.0.20180304/src/tools/set.o
> LD /dev/shm/WireGuard-0.0.20180304/src/tools/wg
git "unstable" version gives the same warning:
> AS [M] /dev/shm/WireGuard/src/crypto/chacha20-x86_64.o
> /dev/shm/WireGuard/src/crypto/chacha20-x86_64.o: warning: objtool: chacha20_avx512vl()+0x3f: can't find jump dest instruction at .text+0x2669
However Wireguard [seemingly] works well despite this warning, tested
with three CentOS 7 servers. Is it OK?
System info:
CentOS 7.4.1708 64bit
Kernel 3.10.0-693.21.1.el7.x86_64
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16)
Make 3.82
elfutils 0.168-8.el7
libmnl 1.0.3-7.el7
BTW many thanks for such a great software, I fell in love with
Wireguard for its simplicity after working for several years with
OpenVPN.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: CentOS 7 build warning, chacha20_avx512vl
2018-03-25 18:50 CentOS 7 build warning, chacha20_avx512vl Vbook A1
@ 2018-03-25 21:17 ` Samuel Neves
0 siblings, 0 replies; 2+ messages in thread
From: Samuel Neves @ 2018-03-25 21:17 UTC (permalink / raw)
To: Vbook A1; +Cc: wireguard
I don't think this is a problem.
This seems to be related to the toolchain not knowing about AVX-512
instructions yet, and therefore mistaking some instruction bytes for
other instructions (i.e., the byte sequence 7d 28 at 0x263f looks like
a jump to offset 0x2669, but it's part of an AVX-512 instruction
`vmovdqa32 ymm16,ymm0`).
Since Linux only added AVX-512 support in version 3.15, this wouldn't
make any difference anyway, as CentOS is stuck on 3.10.
Best,
Samuel Neves
On Sun, Mar 25, 2018 at 7:50 PM, Vbook A1 <vbooka1maillist@gmail.com> wrote:
> Hello,
>
> this is the build log of the latest "stable" WireGuard on the latest CentOS 7:
>
>> -bash-4.2# make
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/main.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/noise.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/device.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/peer.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/timers.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/queueing.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/send.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/receive.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/socket.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/hashtables.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/allowedips.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/ratelimiter.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/cookie.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/netlink.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/curve25519.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/chacha20poly1305.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/blake2s.o
>> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/chacha20-x86_64.o
>> /dev/shm/WireGuard-0.0.20180304/src/crypto/chacha20-x86_64.o: warning: objtool: chacha20_avx512vl()+0x3f: can't find jump dest instruction at .text+0x2669
>> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/poly1305-x86_64.o
>> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/blake2s-x86_64.o
>> AS [M] /dev/shm/WireGuard-0.0.20180304/src/crypto/curve25519-x86_64.o
>> CC [M] /dev/shm/WireGuard-0.0.20180304/src/compat/siphash/siphash.o
>> LD [M] /dev/shm/WireGuard-0.0.20180304/src/wireguard.o
>> Building modules, stage 2.
>> MODPOST 1 modules
>> CC /dev/shm/WireGuard-0.0.20180304/src/wireguard.mod.o
>> LD [M] /dev/shm/WireGuard-0.0.20180304/src/wireguard.ko
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/wg.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/config.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/show.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/terminal.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/ipc.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/mnlg.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/encoding.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/curve25519.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/setconf.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/genkey.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/showconf.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/pubkey.o
>> CC /dev/shm/WireGuard-0.0.20180304/src/tools/set.o
>> LD /dev/shm/WireGuard-0.0.20180304/src/tools/wg
>
>
> git "unstable" version gives the same warning:
>
>> AS [M] /dev/shm/WireGuard/src/crypto/chacha20-x86_64.o
>> /dev/shm/WireGuard/src/crypto/chacha20-x86_64.o: warning: objtool: chacha20_avx512vl()+0x3f: can't find jump dest instruction at .text+0x2669
>
>
> However Wireguard [seemingly] works well despite this warning, tested
> with three CentOS 7 servers. Is it OK?
>
>
> System info:
> CentOS 7.4.1708 64bit
> Kernel 3.10.0-693.21.1.el7.x86_64
> gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16)
> Make 3.82
> elfutils 0.168-8.el7
> libmnl 1.0.3-7.el7
>
>
> BTW many thanks for such a great software, I fell in love with
> Wireguard for its simplicity after working for several years with
> OpenVPN.
> _______________________________________________
> WireGuard mailing list
> WireGuard@lists.zx2c4.com
> https://lists.zx2c4.com/mailman/listinfo/wireguard
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-03-25 21:17 ` Samuel Neves
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