From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: linuxppc-dev@lists.ozlabs.org
Cc: David Gibson <david@gibson.dropbear.id.au>,
kvm-ppc@vger.kernel.org, kvm@vger.kernel.org,
Alistair Popple <alistair@popple.id.au>,
Alex Williamson <alex.williamson@redhat.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Paul Mackerras <paulus@ozlabs.org>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Paul Mackerras <paulus@samba.org>
Subject: [PATCH kernel v2 0/4] powerpc/powernv/kvm: Invalidate multiple TCEs at once
Date: Mon, 26 Aug 2019 16:17:01 +1000 [thread overview]
Message-ID: <20190826061705.92048-1-aik@ozlabs.ru> (raw)
So far TCE cache updates (IOMMU translation cache on POWER8/9
PHB/NPU units) were barely noticeable; however with 100+GB guests
we now see RCU stall warnings in guests because we spend too much
time in the host system firmware which does actual TCE cache
updates, hence this patchset.
This is a rework of https://patchwork.ozlabs.org/patch/1149003/
This depends on KVM-PPC's bugfix: https://patchwork.ozlabs.org/patch/1152937/
I expect 1/4 to go via the PPC tree, 2/4 via the KVM-PPC tree,
3/4 via the VFIO tree and 4/4 via the PPC tree so it is a loop.
There is always a hope it can go via one tree :)
This is based on sha1
42ac26d253eb Santosh Sivaraj "powerpc: add machine check safe copy_to_user".
Please comment. Thanks.
Alexey Kardashevskiy (4):
powerpc/powernv/ioda: Split out TCE invalidation from TCE updates
KVM: PPC: Invalidate multiple TCEs at once
vfio/spapr_tce: Invalidate multiple TCEs at once
powerpc/powernv/ioda: Remove obsolete iommu_table_ops::exchange
callbacks
arch/powerpc/include/asm/iommu.h | 21 ++++++---
arch/powerpc/kernel/iommu.c | 23 ++++++----
arch/powerpc/kvm/book3s_64_vio.c | 29 ++++++++----
arch/powerpc/kvm/book3s_64_vio_hv.c | 38 +++++++++++----
arch/powerpc/platforms/powernv/pci-ioda.c | 56 ++++-------------------
drivers/vfio/vfio_iommu_spapr_tce.c | 18 +++++---
6 files changed, 96 insertions(+), 89 deletions(-)
--
2.17.1
next reply other threads:[~2019-08-26 6:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 6:17 Alexey Kardashevskiy [this message]
2019-08-26 6:17 ` [PATCH kernel v2 1/4] powerpc/powernv/ioda: Split out TCE invalidation from TCE updates Alexey Kardashevskiy
2019-08-26 6:17 ` [PATCH kernel v2 2/4] KVM: PPC: Invalidate multiple TCEs at once Alexey Kardashevskiy
2019-08-27 0:32 ` Paul Mackerras
2019-08-26 6:17 ` [PATCH kernel v2 3/4] vfio/spapr_tce: " Alexey Kardashevskiy
2019-08-26 6:17 ` [PATCH kernel v2 4/4] powerpc/powernv/ioda: Remove obsolete iommu_table_ops::exchange callbacks Alexey Kardashevskiy
2019-08-27 4:48 ` Michael Ellerman
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