Re: [PATCH 07/10] s390/airq: use DMA memory for adapter interrupts

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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?
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linuxfoundation.org/mailman/listinfo/virtualization



[Index of Archives]     [KVM Development]     [Libvirt Development]     [Libvirt Users]     [CentOS Virtualization]     [Netdev]     [Ethernet Bridging]     [Linux Wireless]     [Kernel Newbies]     [Security]     [Linux for Hams]     [Netfilter]     [Bugtraq]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux Admin]     [Samba]

  Powered by Linux