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From: "Alex Bennée" <alex.bennee@linaro.org>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>,
	qemu-arm@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [PATCH v5 20/22] tests/tcg/aarch64: add test-sve-ioctl guest-debug test
Date: Tue, 04 Feb 2020 21:45:12 +0000	[thread overview]
Message-ID: <87lfpi81sn.fsf@linaro.org> (raw)
In-Reply-To: <2731815f-9a72-390b-0a8e-73b77c4b62b6@linaro.org>


Richard Henderson <richard.henderson@linaro.org> writes:

> On 1/14/20 5:09 AM, Alex Bennée wrote:
>> This test exercises the gdbstub while runing the sve-iotcl test. I
>> haven't plubmed it into make system as we need a way of verifying if
>> gdb has the right support for SVE.
>> 
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>> 
>> ---
>> v4
>>   - interrogate ZCR_EL1 directly as no longer have vg
>
> Note that ZCR_EL1 does not give you the correct answer if the hypervisor has
> set ZCR_EL2 to something lower.

Sure - although this is only a user space test so we are not expecting
shenanigans.


> Also, ZCR_EL1 it itself not correct if the
> hardware does not support all vector sizes.
>
> See some of Andrew Jones' qemu command-line work.  Try -cpu max,sve512=on and
> then use the ioctl to set vq to 3 (sve384).  The result will be an effective vq
> of 2 (sve256).
>
> We *really* need vg, as computed from sve_zcr_len_for_el().

How come TARGET_PR_SVE_GET_VL is happy to compute directly from ZCR
then?

I'll put the vg back in but it seemed a little pointless given the
gdbstub ignores it.

>
>
> r~


-- 
Alex Bennée


  reply	other threads:[~2020-02-04 21:46 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-14 15:09 [PATCH v5 00/22] gdbstub refactor and SVE support (+check-tcg tweaks) Alex Bennée
2020-01-14 15:09 ` [PATCH v5 01/22] gdbstub: make GDBState static and have common init function Alex Bennée
2020-01-14 15:09 ` [PATCH v5 02/22] gdbstub: stop passing GDBState * around and use global Alex Bennée
2020-01-16 10:05   ` Damien Hedde
2020-01-16 15:07   ` Philippe Mathieu-Daudé
2020-01-14 15:09 ` [PATCH v5 03/22] gdbstub: move str_buf to GDBState and use GString Alex Bennée
2020-01-14 15:09 ` [PATCH v5 04/22] gdbstub: move mem_buf to GDBState and use GByteArray Alex Bennée
2020-01-14 15:09 ` [PATCH v5 05/22] gdbstub: add helper for 128 bit registers Alex Bennée
2020-01-14 15:09 ` [PATCH v5 06/22] target/arm: use gdb_get_reg helpers Alex Bennée
2020-01-14 15:09 ` [PATCH v5 07/22] target/m68k: " Alex Bennée
2020-01-14 15:09 ` [PATCH v5 08/22] gdbstub: extend GByteArray to read register helpers Alex Bennée
2020-01-14 15:09   ` Alex Bennée
2020-01-15  5:53   ` David Gibson
2020-01-15  5:53     ` David Gibson
2020-01-16  9:58   ` Damien Hedde
2020-01-16  9:58     ` Damien Hedde
2020-01-14 15:09 ` [PATCH v5 09/22] target/arm: prepare for multiple dynamic XMLs Alex Bennée
2020-01-15 22:21   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 10/22] target/arm: explicitly encode regnum in our XML Alex Bennée
2020-01-14 15:09 ` [PATCH v5 11/22] target/arm: default SVE length to 64 bytes for linux-user Alex Bennée
2020-01-14 15:09 ` [PATCH v5 12/22] target/arm: generate xml description of our SVE registers Alex Bennée
2020-01-15 22:16   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 13/22] tests/tcg: add a configure compiler check for ARMv8.1 and SVE Alex Bennée
2020-01-15 22:24   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 14/22] target/arm: don't bother with id_aa64pfr0_read for USER_ONLY Alex Bennée
2020-01-14 15:09 ` [PATCH v5 15/22] tests/tcg/aarch64: userspace system register test Alex Bennée
2020-01-15 22:30   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 16/22] configure: allow user to specify what gdb to use Alex Bennée
2020-01-15 22:31   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 17/22] tests/guest-debug: add a simple test runner Alex Bennée
2020-01-15 22:40   ` Richard Henderson
2020-01-15 22:43   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 18/22] tests/tcg/aarch64: add a gdbstub testcase for SVE registers Alex Bennée
2020-01-15 22:54   ` Richard Henderson
2020-01-16  7:36     ` Alex Bennée
2020-01-14 15:09 ` [PATCH v5 19/22] tests/tcg/aarch64: add SVE iotcl test Alex Bennée
2020-01-15 22:46   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 20/22] tests/tcg/aarch64: add test-sve-ioctl guest-debug test Alex Bennée
2020-01-15 23:07   ` Richard Henderson
2020-02-04 21:45     ` Alex Bennée [this message]
2020-02-05 10:19       ` Richard Henderson
2020-02-05 11:49         ` Andrew Jones
2020-01-14 15:09 ` [PATCH v5 21/22] gdbstub: change GDBState.last_packet to GByteArray Alex Bennée
2020-01-15 23:10   ` Richard Henderson
2020-01-14 15:09 ` [PATCH v5 22/22] gdbstub: do not split gdb_monitor_write payload Alex Bennée
2020-01-15 23:11   ` Richard Henderson
2020-01-14 18:57 ` [PATCH v5 00/22] gdbstub refactor and SVE support (+check-tcg tweaks) no-reply

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