On Thu, 23 May 2019 18:22:05 +0200 Michael Mueller <mimu@xxxxxxxxxxxxx> wrote: > From: Halil Pasic <pasic@xxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxx> > --- > 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, 25 insertions(+), 12 deletions(-) (...) > diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c > index 789f6ecdbbcc..f09521771a32 100644 > --- a/drivers/s390/cio/css.c > +++ b/drivers/s390/cio/css.c > @@ -1173,6 +1173,7 @@ static int __init css_bus_init(void) > goto out_unregister; > } > cio_dma_pool_init(); > + airq_init(); > css_init_done = 1; > > /* Enable default isc for I/O subchannels. */ Not directly related to this patch (I don't really have any comment here), but I started looking at the code again and now I'm wondering about chsc. I think it came up before, but I can't remember if chsc needed special treatment... Anyway, css_bus_init() uses some chscs early (before cio_dma_pool_init), so we could not use the pools there, even if we wanted to. Do chsc commands either work, or else fail benignly on a protected virt guest?
