On 4/5/22 9:39 AM, Niklas Schnelle wrote:
On Mon, 2022-04-04 at 13:43 -0400, Matthew Rosato wrote:
These routines will be wired into a kvm ioctl in order to respond to
requests to enable / disable a device for Adapter Event Notifications /
Adapter Interuption Forwarding.
Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
arch/s390/kvm/pci.c | 247 +++++++++++++++++++++++++++++++++++++++
arch/s390/kvm/pci.h | 1 +
arch/s390/pci/pci_insn.c | 1 +
3 files changed, 249 insertions(+)
diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
index 01bd8a2f503b..f0fd68569a9d 100644
--- a/arch/s390/kvm/pci.c
+++ b/arch/s390/kvm/pci.c
@@ -11,6 +11,7 @@
#include <linux/pci.h>
#include <asm/pci.h>
#include <asm/pci_insn.h>
+#include <asm/pci_io.h>
#include "pci.h"
struct zpci_aift *aift;
@@ -152,6 +153,252 @@ int kvm_s390_pci_aen_init(u8 nisc)
return rc;
}
+/* Modify PCI: Register floating adapter interruption forwarding */
+static int kvm_zpci_set_airq(struct zpci_dev *zdev)
+{
+ u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
+ struct zpci_fib fib = {};
Hmm this one uses '{}' as initializer while all current callers of
zpci_mod_fc() use '{0}'. As far as I know the empty braces are a GNU
extension so should work for the kernel but for consistency I'd go with
'{0}' or possibly '{.foo = bar, ...}' where that is more readable.
There too uninitialized fields will be set to 0. Unless of course there
is a conflicting KVM convention that I don't know about.
No convention that I'm aware of, I previously had fib = {0} based on the
same rationale you describe and changed to fib = {} per review request
from Pierre a few versions back. I don't have a strong preference, but
I did not note any functional difference between the two and see a bunch
of examples of both methods throughout the kernel.
