Re: [PATCH v2 18/30] KVM: s390: pci: provide routines for enabling/disabling interpretation

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On 1/24/22 9:36 AM, Pierre Morel wrote:


On 1/14/22 21:31, Matthew Rosato wrote:
These routines will be wired into the vfio_pci_zdev ioctl handlers to
respond to requests to enable / disable a device for zPCI Load/Store
interpretation.

The first time such a request is received, enable the necessary facilities
for the guest.

Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx>
---
  arch/s390/include/asm/kvm_pci.h |  4 ++
  arch/s390/kvm/pci.c             | 99 +++++++++++++++++++++++++++++++++
  arch/s390/pci/pci.c             |  3 +
  3 files changed, 106 insertions(+)

diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h
index aafee2976929..072401aa7922 100644
--- a/arch/s390/include/asm/kvm_pci.h
+++ b/arch/s390/include/asm/kvm_pci.h
@@ -26,4 +26,8 @@ int kvm_s390_pci_dev_open(struct zpci_dev *zdev);
  void kvm_s390_pci_dev_release(struct zpci_dev *zdev);
  void kvm_s390_pci_attach_kvm(struct zpci_dev *zdev, struct kvm *kvm);
+int kvm_s390_pci_interp_probe(struct zpci_dev *zdev);
+int kvm_s390_pci_interp_enable(struct zpci_dev *zdev);
+int kvm_s390_pci_interp_disable(struct zpci_dev *zdev);
+
  #endif /* ASM_KVM_PCI_H */
diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
index dae853da6df1..122d0992b521 100644
--- a/arch/s390/kvm/pci.c
+++ b/arch/s390/kvm/pci.c
@@ -12,7 +12,9 @@
  #include <asm/kvm_pci.h>
  #include <asm/pci.h>
  #include <asm/pci_insn.h>
+#include <asm/sclp.h>
  #include "pci.h"
+#include "kvm-s390.h"
  struct zpci_aift *aift;
@@ -143,6 +145,103 @@ int kvm_s390_pci_aen_init(u8 nisc)
      return rc;
  }
+int kvm_s390_pci_interp_probe(struct zpci_dev *zdev)
+{
+    /* Must have appropriate hardware facilities */
+    if (!(sclp.has_zpci_lsi && test_facility(69)))

Should'nt we also test the other facilities we need for the interpretation like ARNI, AISII, ASI and GISA ?

Or are we sure they are always there when ZPCI load/store interpretation is available?

I think some of these are implicit based on others but I think you're right that we should be testing for more than this to be safe. I think additionally test for AENI, AISII, AISI -- basically we should match what we test for in patch 17.



+        return -EINVAL;
+
+    /* Must have a KVM association registered */
+    if (!zdev->kzdev || !zdev->kzdev->kvm)
+        return -EINVAL;
+
+    return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_s390_pci_interp_probe);
+
+int kvm_s390_pci_interp_enable(struct zpci_dev *zdev)
+{
+    u32 gd;
+    int rc;
+
+    if (!zdev->kzdev || !zdev->kzdev->kvm)
+        return -EINVAL;
+
+    /*
+     * If this is the first request to use an interpreted device, make the
+     * necessary vcpu changes
+     */
+    if (!zdev->kzdev->kvm->arch.use_zpci_interp)
+        kvm_s390_vcpu_pci_enable_interp(zdev->kzdev->kvm);
+
+    /*
+     * In the event of a system reset in userspace, the GISA designation
+     * may still be assigned because the device is still enabled.
+     * Verify it's the same guest before proceeding.
+     */
+    gd = (u32)(u64)&zdev->kzdev->kvm->arch.sie_page2->gisa;

should use the virt_to_phys transformation ?

Yes



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