Re: [PATCH v5 14/21] KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding

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On 4/5/22 15:48, Matthew Rosato wrote:
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.


Was stupid of me to comment that, as you said there are no difference, so do as you want.


--
Pierre Morel
IBM Lab Boeblingen



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