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On Sun, 12 May 2019, Halil Pasic wrote: > I've also got code that deals with AIRQ_IV_CACHELINE by turning the > kmem_cache into a dma_pool. > > Cornelia, Sebastian which approach do you prefer: > 1) get rid of cio_dma_pool and AIRQ_IV_CACHELINE, and waste a page per > vector, or > 2) go with the approach taken by the patch below? We only have a couple of users for

On Sun, 12 May 2019, Halil Pasic wrote: > I've also got code that deals with AIRQ_IV_CACHELINE by turning the > kmem_cache into a dma_pool. > > Cornelia, Sebastian which approach do you prefer: > 1) get rid of cio_dma_pool and AIRQ_IV_CACHELINE, and waste a page per > vector, or > 2) go with the approach taken by the patch below? We only have a couple of users for

...and provides the behavior which is closest to the current one. Commit 414cbd1e3d14 "s390/airq: provide cacheline aligned ivs" (Sebastian Ott, 2019-02-27) could have been smaller had you implemented 'kmem_cache for everything' (and I would have had just to replace kmem_cache with dma_cache to achieve option 3). For some reason you decided to keep the iv->vector = kzalloc(size, GFP_KERNEL) code-path and make the client code request iv->vector = kmem_cache_zalloc(airq_iv_cache, GFP_KERNEL) explicitly, using a flag which you only decided to use for directed pci irqs AFAICT. My u...

...;pasic at linux.ibm.com> wrote: > Protected virtualization guests have to use shared pages for airq > notifier bit vectors, because hypervisor needs to write these bits. > > Let us make sure we allocate DMA memory for the notifier bit vectors by > replacing the kmem_cache with a dma_cache and kalloc() with > cio_dma_zalloc(). > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > --- > arch/s390/include/asm/airq.h | 2 ++ > drivers/s390/cio/airq.c | 32 ++++++++++++++++++++------------...

...;pasic at linux.ibm.com> wrote: > Protected virtualization guests have to use shared pages for airq > notifier bit vectors, because hypervisor needs to write these bits. > > Let us make sure we allocate DMA memory for the notifier bit vectors by > replacing the kmem_cache with a dma_cache and kalloc() with > cio_dma_zalloc(). > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > --- > arch/s390/include/asm/airq.h | 2 ++ > drivers/s390/cio/airq.c | 32 ++++++++++++++++++++------------...

...lt;pasic at linux.ibm.com> > > Protected virtualization guests have to use shared pages for airq > notifier bit vectors, because hypervisor needs to write these bits. > > Let us make sure we allocate DMA memory for the notifier bit vectors by > replacing the kmem_cache with a dma_cache and kalloc() with > cio_dma_zalloc(). > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > Signed-off-by: Michael Mueller <mimu at linux.ibm.com> > --- > arch/s390/include/asm/airq.h | 2 ++ >...

...lt;pasic at linux.ibm.com> > > Protected virtualization guests have to use shared pages for airq > notifier bit vectors, because hypervisor needs to write these bits. > > Let us make sure we allocate DMA memory for the notifier bit vectors by > replacing the kmem_cache with a dma_cache and kalloc() with > cio_dma_zalloc(). > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > Signed-off-by: Michael Mueller <mimu at linux.ibm.com> > --- > arch/s390/include/asm/airq.h | 2 ++ >...

...further simplification/unification later. > Commit 414cbd1e3d14 "s390/airq: provide cacheline aligned > ivs" (Sebastian Ott, 2019-02-27) could have been smaller had you implemented > 'kmem_cache for everything' (and I would have had just to replace kmem_cache with > dma_cache to achieve option 3). For some reason you decided to keep the > iv->vector = kzalloc(size, GFP_KERNEL) code-path and make the client code request > iv->vector = kmem_cache_zalloc(airq_iv_cache, GFP_KERNEL) explicitly, using a flag > which you only decided to use for directed pci irq...

...> > > > Protected virtualization guests have to use shared pages for airq > > notifier bit vectors, because hypervisor needs to write these bits. > > > > Let us make sure we allocate DMA memory for the notifier bit vectors by > > replacing the kmem_cache with a dma_cache and kalloc() with > > cio_dma_zalloc(). > > > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > > Signed-off-by: Michael Mueller <mimu at linux.ibm.com> > > --- > > arch/s39...

...ote: > > > Protected virtualization guests have to use shared pages for airq > > notifier bit vectors, because hypervisor needs to write these bits. > > > > Let us make sure we allocate DMA memory for the notifier bit vectors by > > replacing the kmem_cache with a dma_cache and kalloc() with > > cio_dma_zalloc(). > > > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > > --- > > arch/s390/include/asm/airq.h | 2 ++ > > drivers/s390/cio/airq.c |...

...;pasic at linux.ibm.com> wrote: > Protected virtualization guests have to use shared pages for airq > notifier bit vectors, because hypervisor needs to write these bits. > > Let us make sure we allocate DMA memory for the notifier bit vectors by > replacing the kmem_cache with a dma_cache and kalloc() with > cio_dma_zalloc(). > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > --- > arch/s390/include/asm/airq.h | 2 ++ > drivers/s390/cio/airq.c | 37 ++++++++++++++++++++++----------...

...Protected virtualization guests have to use shared pages for airq > > > notifier bit vectors, because hypervisor needs to write these bits. > > > > > > Let us make sure we allocate DMA memory for the notifier bit vectors by > > > replacing the kmem_cache with a dma_cache and kalloc() with > > > cio_dma_zalloc(). > > > > > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > > > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > > > --- > > > arch/s390/include/asm/airq.h | 2 ++ > > &g...

...Protected virtualization guests have to use shared pages for airq > > > notifier bit vectors, because hypervisor needs to write these bits. > > > > > > Let us make sure we allocate DMA memory for the notifier bit vectors by > > > replacing the kmem_cache with a dma_cache and kalloc() with > > > cio_dma_zalloc(). > > > > > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > > > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > > > --- > > > arch/s390/include/asm/airq.h | 2 ++ > > &g...

From: Halil Pasic <pasic at linux.ibm.com> Protected virtualization guests have to use shared pages for airq notifier bit vectors, because hypervisor needs to write these bits. Let us make sure we allocate DMA memory for the notifier bit vectors by replacing the kmem_cache with a dma_cache and kalloc() with cio_dma_zalloc(). Signed-off-by: Halil Pasic <pasic at linux.ibm.com> --- arch/s390/include/asm/airq.h | 2 ++ drivers/s390/cio/airq.c | 32 ++++++++++++++++++++------------ drivers/s390/cio/cio.h | 2 ++ drivers/s390/cio/css.c | 1 + 4 files changed,...

Protected virtualization guests have to use shared pages for airq notifier bit vectors, because hypervisor needs to write these bits. Let us make sure we allocate DMA memory for the notifier bit vectors by replacing the kmem_cache with a dma_cache and kalloc() with cio_dma_zalloc(). Signed-off-by: Halil Pasic <pasic at linux.ibm.com> Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> --- arch/s390/include/asm/airq.h | 2 ++ drivers/s390/cio/airq.c | 32 ++++++++++++++++++++------------ drivers/s390/cio/cio.h | 2...

Protected virtualization guests have to use shared pages for airq notifier bit vectors, because hypervisor needs to write these bits. Let us make sure we allocate DMA memory for the notifier bit vectors by replacing the kmem_cache with a dma_cache and kalloc() with cio_dma_zalloc(). Signed-off-by: Halil Pasic <pasic at linux.ibm.com> Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> --- arch/s390/include/asm/airq.h | 2 ++ drivers/s390/cio/airq.c | 37 ++++++++++++++++++++++-------------- drivers/s390/cio/cio.h...

From: Halil Pasic <pasic at linux.ibm.com> Protected virtualization guests have to use shared pages for airq notifier bit vectors, because hypervisor needs to write these bits. Let us make sure we allocate DMA memory for the notifier bit vectors by replacing the kmem_cache with a dma_cache and kalloc() with cio_dma_zalloc(). Signed-off-by: Halil Pasic <pasic at linux.ibm.com> Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> Signed-off-by: Michael Mueller <mimu at linux.ibm.com> --- arch/s390/include/asm/airq.h | 2 ++ drivers/s390/cio/airq.c | 32 ++++++...

...ation guests have to use shared pages for airq > > > > notifier bit vectors, because hypervisor needs to write these bits. > > > > > > > > Let us make sure we allocate DMA memory for the notifier bit vectors by > > > > replacing the kmem_cache with a dma_cache and kalloc() with > > > > cio_dma_zalloc(). > > > > > > > > Signed-off-by: Halil Pasic <pasic at linux.ibm.com> > > > > Reviewed-by: Sebastian Ott <sebott at linux.ibm.com> > > > > --- > > > > arch/s390/include/a...

Enhanced virtualization protection technology may require the use of bounce buffers for I/O. While support for this was built into the virtio core, virtio-ccw wasn't changed accordingly. Some background on technology (not part of this series) and the terminology used. * Protected Virtualization (PV): Protected Virtualization guarantees, that non-shared memory of a guest that operates in PV

Enhanced virtualization protection technology may require the use of bounce buffers for I/O. While support for this was built into the virtio core, virtio-ccw wasn't changed accordingly. Some background on technology (not part of this series) and the terminology used. * Protected Virtualization (PV): Protected Virtualization guarantees, that non-shared memory of a guest that operates in PV