From: Petr Vorel <pvorel@suse.cz>
To: Martin Doucha <mdoucha@suse.cz>
Cc: ltp@lists.linux.it, Nicolai Stange <nstange@suse.de>
Subject: Re: [LTP] [PATCH 4/7] KVM: Add async communication helper functions
Date: Thu, 18 May 2023 11:55:03 +0200 [thread overview]
Message-ID: <20230518095503.GC6467@pevik> (raw)
In-Reply-To: <18915cfd-8866-a01f-8562-1c6023a8e47f@suse.cz>
> On 18. 05. 23 0:47, Petr Vorel wrote:
> > Hi Martin,
> > Acked-by: Petr Vorel <pvorel@suse.cz>
> > > /*
> > > * Result value indicating end of test. If the test program exits using
> > > * the HLT instruction with any valid result value other than KVM_TEXIT or
> > > diff --git a/testcases/kernel/kvm/include/kvm_guest.h b/testcases/kernel/kvm/include/kvm_guest.h
> > > index ec13c5845..96f246155 100644
> > > --- a/testcases/kernel/kvm/include/kvm_guest.h
> > > +++ b/testcases/kernel/kvm/include/kvm_guest.h
> > > @@ -64,6 +64,20 @@ void tst_brk_(const char *file, const int lineno, int result,
> > > const char *message) __attribute__((noreturn));
> > > #define tst_brk(result, msg) tst_brk_(__FILE__, __LINE__, (result), (msg))
> > BTW (unrelated to this commit, as it was not added to this commit) tst_brk()
> > definition from include/tst_test.h contains also
> > TST_BRK_SUPPORTS_ONLY_TCONF_TBROK().
> > And tst_res() has also TST_RES_SUPPORTS_TCONF_TFAIL_TINFO_TPASS_TWARN().
> The support macros are not needed, the controller program always handles
> TBROK using tst_brk() even if the guest incorrectly called tst_res(TBROK).
ack
> > We could rename tst_res_flags.h to tst_res.h and add there tst_brk() and
> > tst_res() definitions and tst_brk_() and tst_res_() signatures.
> I don't think that's a good idea. The guest library currently does not
> support variadic parameters for tst_res() and tst_brk() so the function
> signatures are slightly different.
Ah, right.
> > > diff --git a/testcases/kernel/kvm/lib_guest.c b/testcases/kernel/kvm/lib_guest.c
> > > index d3b2ac3d5..f3e21d3d6 100644
> > > --- a/testcases/kernel/kvm/lib_guest.c
> > > +++ b/testcases/kernel/kvm/lib_guest.c
> > > @@ -155,6 +155,22 @@ void tst_brk_(const char *file, const int lineno, int result,
> > > kvm_exit();
> > > }
> > > +void tst_signal_host(void *data)
> > > +{
> > > + test_result->file_addr = (uintptr_t)data;
> > > + test_result->result = KVM_TSYNC;
> > > +}
> > > +
> > > +void tst_wait_host(void *data)
> > > +{
> > > + volatile int32_t *vres = &test_result->result;
> > > +
> > > + tst_signal_host(data);
> > > +
> > > + while (*vres != KVM_TNONE)
> > > + ;
> > Interesting there is no any usleep().
> usleep() does not exist in the guest library. And even if it did, yielding
> the CPU to the host would prevent kvm_svm03 from ever reproducing the CLGI
> bug.
Ah, I thought I'm missing something obvious, thanks for an explanation.
Kind regards,
Petr
--
Mailing list info: https://lists.linux.it/listinfo/ltp
next prev parent reply other threads:[~2023-05-18 9:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-17 15:36 [LTP] [PATCH 0/7] Two AMD SVM vulnerability tests Martin Doucha
2023-05-17 15:36 ` [LTP] [PATCH 1/7] KVM: Add VMSAVE/VMLOAD intercept constants Martin Doucha
2023-05-17 22:08 ` Petr Vorel
2023-05-18 8:27 ` Martin Doucha
2023-05-18 9:49 ` Petr Vorel
2023-05-17 15:36 ` [LTP] [PATCH 2/7] Add test for CVE 2021-3656 Martin Doucha
2023-05-17 22:32 ` Petr Vorel
2023-05-18 8:29 ` Martin Doucha
2023-05-18 9:56 ` Petr Vorel
2023-05-17 15:36 ` [LTP] [PATCH 3/7] lib: Add safe functions for pthread_kill() and mutexes Martin Doucha
2023-05-17 23:07 ` Petr Vorel
2023-05-23 12:02 ` Cyril Hrubis
2023-05-17 15:36 ` [LTP] [PATCH 4/7] KVM: Add async communication helper functions Martin Doucha
2023-05-17 22:47 ` Petr Vorel
2023-05-18 8:36 ` Martin Doucha
2023-05-18 9:55 ` Petr Vorel [this message]
2023-05-23 12:13 ` Cyril Hrubis
2023-05-23 12:18 ` Martin Doucha
2023-05-17 15:36 ` [LTP] [PATCH 5/7] KVM: Allow expected KVM_RUN errors in tst_kvm_run_instance() Martin Doucha
2023-05-18 10:03 ` Petr Vorel
2023-05-23 12:22 ` Cyril Hrubis
2023-05-17 15:36 ` [LTP] [PATCH 6/7] KVM: Add STGI/CLGI intercept constants Martin Doucha
2023-05-17 23:20 ` Petr Vorel
2023-05-18 8:38 ` Martin Doucha
2023-05-18 9:53 ` Petr Vorel
2023-05-17 15:36 ` [LTP] [PATCH 7/7] Add KVM test for CPU lockup through malicous SVM guest Martin Doucha
2023-05-18 10:08 ` Petr Vorel
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