Commit 6438e307 authored by Matthew Rosato's avatar Matthew Rosato Committed by Christian Borntraeger
Browse files

KVM: s390: pci: add basic kvm_zdev structure 



This structure will be used to carry kvm passthrough information related to
zPCI devices.

Reviewed-by: default avatarNiklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: default avatarPierre Morel <pmorel@linux.ibm.com>
Reviewed-by: default avatarChristian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20220606203325.110625-12-mjrosato@linux.ibm.com


Signed-off-by: default avatarChristian Borntraeger <borntraeger@linux.ibm.com>
parent c435c546

arch/s390/include/asm/pci.h

+3 −0
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ struct zpci_bar_struct { 
};



struct s390_domain;

struct kvm_zdev;



#define ZPCI_FUNCTIONS_PER_BUS 256

struct zpci_bus {
@@ -189,7 +190,9 @@ struct zpci_dev { 


	struct dentry	*debugfs_dev;



	/* IOMMU and passthrough */

	struct s390_domain *s390_domain; /* s390 IOMMU domain data */

	struct kvm_zdev *kzdev;

};



static inline bool zdev_enabled(struct zpci_dev *zdev)

arch/s390/kvm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,4 +10,5 @@ ccflags-y := -Ivirt/kvm -Iarch/s390/kvm 
kvm-y += kvm-s390.o intercept.o interrupt.o priv.o sigp.o

kvm-y += diag.o gaccess.o guestdbg.o vsie.o pv.o



kvm-$(CONFIG_VFIO_PCI_ZDEV_KVM) += pci.o

obj-$(CONFIG_KVM) += kvm.o

arch/s390/kvm/pci.c

0 → 100644
+36 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * s390 kvm PCI passthrough support

 *

 * Copyright IBM Corp. 2022

 *

 *    Author(s): Matthew Rosato <mjrosato@linux.ibm.com>

 */



#include <linux/kvm_host.h>

#include <linux/pci.h>

#include "pci.h"



static int kvm_s390_pci_dev_open(struct zpci_dev *zdev)

{

	struct kvm_zdev *kzdev;



	kzdev = kzalloc(sizeof(struct kvm_zdev), GFP_KERNEL);

	if (!kzdev)

		return -ENOMEM;



	kzdev->zdev = zdev;

	zdev->kzdev = kzdev;



	return 0;

}



static void kvm_s390_pci_dev_release(struct zpci_dev *zdev)

{

	struct kvm_zdev *kzdev;



	kzdev = zdev->kzdev;

	WARN_ON(kzdev->zdev != zdev);

	zdev->kzdev = NULL;

	kfree(kzdev);

}

arch/s390/kvm/pci.h

0 → 100644
+21 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * s390 kvm PCI passthrough support

 *

 * Copyright IBM Corp. 2022

 *

 *    Author(s): Matthew Rosato <mjrosato@linux.ibm.com>

 */



#ifndef __KVM_S390_PCI_H

#define __KVM_S390_PCI_H



#include <linux/kvm_host.h>

#include <linux/pci.h>



struct kvm_zdev {

	struct zpci_dev *zdev;

	struct kvm *kvm;

};



#endif /* __KVM_S390_PCI_H */