On Fri, 26 Apr 2019 20:32:42 +0200 Halil Pasic <pasic@xxxxxxxxxxxxx> 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. > > Signed-off-by: Halil Pasic <pasic@xxxxxxxxxxxxx> > --- > arch/s390/include/asm/airq.h | 2 ++ > drivers/s390/cio/airq.c | 18 ++++++++++++++---- > 2 files changed, 16 insertions(+), 4 deletions(-) As an aside, there are some other devices that use adapter interrupts as well (pci, ap, qdio). How does that interact with their needs? Do they continue to work on non-protected virt guests (kvm or z/VM), and can they be accommodated if support for them on protected guests is added in the future? (For some of the indicator bit handling, I suspect millicode takes care of it anyway, but at least for pci, there's some hypervisor action to be aware of.) Also, as another aside, has this been tested with a regular guest under tcg as well? If not, can you provide a branch for quick verification somewhere?
