linux-kernel - Re: [PATCH v2 3/4] KVM: selftests: Allow slot modification stress test with quirk disabled

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Message-ID: <ZvNckKjlieCN56th@yzhao56-desk.sh.intel.com>
Date: Wed, 25 Sep 2024 08:42:56 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Aishwarya TCV <aishwarya.tcv@....com>
CC: <rick.p.edgecombe@...el.com>, <kai.huang@...el.com>,
	<isaku.yamahata@...el.com>, <dmatlack@...gle.com>, <sagis@...gle.com>,
	<erdemaktas@...gle.com>, <graf@...zon.com>, <linux-kernel@...r.kernel.org>,
	<kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>,
	<seanjc@...gle.com>, Mark Brown <broonie@...nel.org>, Naresh Kamboju
	<naresh.kamboju@...aro.org>
Subject: Re: [PATCH v2 3/4] KVM: selftests: Allow slot modification stress
 test with quirk disabled

On Tue, Sep 24, 2024 at 01:26:20PM +0100, Aishwarya TCV wrote:
> 
> 
> On 03/07/2024 03:12, Yan Zhao wrote:
> > Add a new user option to memslot_modification_stress_test to allow testing
> > with slot zap quirk KVM_X86_QUIRK_SLOT_ZAP_ALL disabled.
> > 
> > Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
> > ---
> >  .../kvm/memslot_modification_stress_test.c    | 19 +++++++++++++++++--
> Hi Yan,
> 
> When building kselftest-kvm config against next-20240924 kernel with
> Arm64 an error "'KVM_X86_QUIRK_SLOT_ZAP_ALL' undeclared" is observed.
Ah, I forgot to hide  
  "TEST_REQUIRE(kvm_check_cap(KVM_CAP_DISABLE_QUIRKS2) &
                       KVM_X86_QUIRK_SLOT_ZAP_ALL)"
inside "#ifdef __x86_64__" when parsing opts though it's done in run_test().

> 
> A bisect identified 218f6415004a881d116e254eeb837358aced55ab as the
> first bad commit. Bisected it on the tag "next-20240923" at repo
> "https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git".
> Reverting the change seems to fix it.
> 
> This works fine on Linux version 6.11
> 
> Failure log
> ------------
> https://storage.kernelci.org/next/master/next-20240924/arm64/defconfig+kselftest/gcc-12/logs/kselftest.log
> 
> In file included from include/kvm_util.h:8,
>                  from include/memstress.h:13,
>                  from memslot_modification_stress_test.c:21:
> memslot_modification_stress_test.c: In function ‘main’:
> memslot_modification_stress_test.c:176:38: error:
> ‘KVM_X86_QUIRK_SLOT_ZAP_ALL’ undeclared (first use in this function)
>   176 |                                      KVM_X86_QUIRK_SLOT_ZAP_ALL);
>       |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~
> include/test_util.h:41:15: note: in definition of macro ‘__TEST_REQUIRE’
>    41 |         if (!(f))                                               \
>       |               ^
> memslot_modification_stress_test.c:175:25: note: in expansion of macro
> ‘TEST_REQUIRE’
>   175 |
> TEST_REQUIRE(kvm_check_cap(KVM_CAP_DISABLE_QUIRKS2) &
>       |                         ^~~~~~~~~~~~
> memslot_modification_stress_test.c:176:38: note: each undeclared
> identifier is reported only once for each function it appears in
>   176 |                                      KVM_X86_QUIRK_SLOT_ZAP_ALL);
>       |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~
> include/test_util.h:41:15: note: in definition of macro ‘__TEST_REQUIRE’
>    41 |         if (!(f))                                               \
>       |               ^
> memslot_modification_stress_test.c:175:25: note: in expansion of macro
> ‘TEST_REQUIRE’
>   175 |
> TEST_REQUIRE(kvm_check_cap(KVM_CAP_DISABLE_QUIRKS2) &
>       |                         ^~~~~~~~~~~~
> At top level:
> cc1: note: unrecognized command-line option
> ‘-Wno-gnu-variable-sized-type-not-at-end’ may have been intended to
> silence earlier diagnostics
> make[4]: *** [Makefile:300:
> /tmp/kci/linux/build/kselftest/kvm/memslot_modification_stress_test.o]
> Error 1
> make[4]: Leaving directory '/tmp/kci/linux/tools/testing/selftests/kvm'
> 
> 
> Bisect log:
> ----------
> 
> git bisect start
> # good: [98f7e32f20d28ec452afb208f9cffc08448a2652] Linux 6.11
> git bisect good 98f7e32f20d28ec452afb208f9cffc08448a2652
> # bad: [ef545bc03a65438cabe87beb1b9a15b0ffcb6ace] Add linux-next
> specific files for 20240923
> git bisect bad ef545bc03a65438cabe87beb1b9a15b0ffcb6ace
> # good: [176000734ee2978121fde22a954eb1eabb204329] Merge tag
> 'ata-6.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux
> git bisect good 176000734ee2978121fde22a954eb1eabb204329
> # good: [f55bf3fb11d7fe32a37b8d625744d22891c02e5e] Merge branch
> 'at91-next' of git://git.kernel.org/pub/scm/linux/kernel/git/at91/linux.git
> git bisect good f55bf3fb11d7fe32a37b8d625744d22891c02e5e
> # good: [1340ff0aa9e6dcb9c8ac5f86472eb78ba524b14a] Merge branch
> 'for-next' of git://git.kernel.dk/linux-block.git
> git bisect good 1340ff0aa9e6dcb9c8ac5f86472eb78ba524b14a
> # bad: [51d98f15885e036a06fef35c396c987e80c47a27] Merge branch
> 'char-misc-next' of
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
> git bisect bad 51d98f15885e036a06fef35c396c987e80c47a27
> # bad: [4f216a17ef0dc3bf99c28902abbc6c70fb7798a0] Merge branch
> 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
> git bisect bad 4f216a17ef0dc3bf99c28902abbc6c70fb7798a0
> # bad: [b11ba58b0ef5c932303dac5ce96e17d96c127870] Merge branch 'next' of
> git://git.kernel.org/pub/scm/virt/kvm/kvm.git
> git bisect bad b11ba58b0ef5c932303dac5ce96e17d96c127870
> # good: [b7ba28772e5709196e3efffb9341c7fd698b2497] Merge branch
> 'for-next' of
> git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
> git bisect good b7ba28772e5709196e3efffb9341c7fd698b2497
> # bad: [c345344e8317176944be33f46e18812c0343dc63] Merge tag
> 'kvm-x86-selftests-6.12' of https://github.com/kvm-x86/linux into HEAD
> git bisect bad c345344e8317176944be33f46e18812c0343dc63
> # bad: [7056c4e2a13a61f4e8a9e8ce27cd499f27e0e63b] Merge tag
> 'kvm-x86-generic-6.12' of https://github.com/kvm-x86/linux into HEAD
> git bisect bad 7056c4e2a13a61f4e8a9e8ce27cd499f27e0e63b
> # bad: [590b09b1d88e18ae57f89930a6f7b89795d2e9f3] KVM: x86: Register
> "emergency disable" callbacks when virt is enabled
> git bisect bad 590b09b1d88e18ae57f89930a6f7b89795d2e9f3
> # bad: [70c0194337d38dd29533e63e3cb07620f8c5eae1] KVM: Rename symbols
> related to enabling virtualization hardware
> git bisect bad 70c0194337d38dd29533e63e3cb07620f8c5eae1
> # bad: [218f6415004a881d116e254eeb837358aced55ab] KVM: selftests: Allow
> slot modification stress test with quirk disabled
> git bisect bad 218f6415004a881d116e254eeb837358aced55ab
> # good: [b4ed2c67d275b85b2ab07d54f88bebd5998d61d8] KVM: selftests: Test
> slot move/delete with slot zap quirk enabled/disabled
> git bisect good b4ed2c67d275b85b2ab07d54f88bebd5998d61d8
> # first bad commit: [218f6415004a881d116e254eeb837358aced55ab] KVM:
> selftests: Allow slot modification stress test with quirk disabled
> 
> Thanks,
> Aishwarya
>