From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Roth <mdroth@linux.vnet.ibm.com>, linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>, kvm-ppc@vger.kernel.org
Subject: Re: [PATCH v2] KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag
Date: Wed, 25 Sep 2019 11:05:20 +0000 [thread overview]
Message-ID: <46dZwJ4fsTz9sPc@ozlabs.org> (raw)
In-Reply-To: <20190911223155.16045-1-mdroth@linux.vnet.ibm.com>
In-Reply-To: <20190911223155.16045-1-mdroth@linux.vnet.ibm.com>
On Wed, 2019-09-11 at 22:31:55 UTC, Michael Roth wrote:
> On a 2-socket Power9 system with 32 cores/128 threads (SMT4) and 1TB
> of memory running the following guest configs:
...
> To handle both cases, this patch splits kvmppc_set_host_ipi() into
> separate set/clear functions, where we execute smp_mb() prior to
> setting host_ipi flag, and after clearing host_ipi flag. These
> functions pair with each other to synchronize the sender and receiver
> sides.
>
> With that change in place the above workload ran for 20 hours without
> triggering any lock-ups.
>
> Fixes: 755563bc79c7 ("powerpc/powernv: Fixes for hypervisor doorbell handling") # v4.0
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@ozlabs.org>
> Cc: Nicholas Piggin <npiggin@gmail.com>
> Cc: kvm-ppc@vger.kernel.org
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/3a83f677a6eeff65751b29e3648d7c69c3be83f3
cheers
WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Roth <mdroth@linux.vnet.ibm.com>, linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>, kvm-ppc@vger.kernel.org
Subject: Re: [PATCH v2] KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag
Date: Wed, 25 Sep 2019 21:05:20 +1000 (AEST) [thread overview]
Message-ID: <46dZwJ4fsTz9sPc@ozlabs.org> (raw)
In-Reply-To: <20190911223155.16045-1-mdroth@linux.vnet.ibm.com>
On Wed, 2019-09-11 at 22:31:55 UTC, Michael Roth wrote:
> On a 2-socket Power9 system with 32 cores/128 threads (SMT4) and 1TB
> of memory running the following guest configs:
...
> To handle both cases, this patch splits kvmppc_set_host_ipi() into
> separate set/clear functions, where we execute smp_mb() prior to
> setting host_ipi flag, and after clearing host_ipi flag. These
> functions pair with each other to synchronize the sender and receiver
> sides.
>
> With that change in place the above workload ran for 20 hours without
> triggering any lock-ups.
>
> Fixes: 755563bc79c7 ("powerpc/powernv: Fixes for hypervisor doorbell handling") # v4.0
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@ozlabs.org>
> Cc: Nicholas Piggin <npiggin@gmail.com>
> Cc: kvm-ppc@vger.kernel.org
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/3a83f677a6eeff65751b29e3648d7c69c3be83f3
cheers
next prev parent reply other threads:[~2019-09-25 11:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-11 22:31 [PATCH v2] KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag Michael Roth
2019-09-11 22:31 ` Michael Roth
2019-09-23 23:40 ` Paul Mackerras
2019-09-23 23:40 ` Paul Mackerras
2019-09-25 11:05 ` Michael Ellerman [this message]
2019-09-25 11:05 ` Michael Ellerman
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