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Message-ID: <03cc0e2b-13df-02b3-f6d6-0bef3e9e64a7@linux.ibm.com>
Date: Tue, 18 Jan 2022 13:39:52 -0500
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: Pierre Morel <pmorel@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc: alex.williamson@...hat.com, cohuck@...hat.com,
schnelle@...ux.ibm.com, farman@...ux.ibm.com,
borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com,
gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com,
thuth@...hat.com, pasic@...ux.ibm.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/30] KVM: s390: pci: add basic kvm_zdev structure
On 1/18/22 12:32 PM, Pierre Morel wrote:
>
>
> On 1/17/22 17:25, Pierre Morel wrote:
>>
>>
>> On 1/14/22 21:31, Matthew Rosato wrote:
>>> This structure will be used to carry kvm passthrough information
>>> related to
>>> zPCI devices.
>>>
>>> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
>>> ---
>>> arch/s390/include/asm/kvm_pci.h | 29 +++++++++++++++++++++
>>> arch/s390/include/asm/pci.h | 3 +++
>>> arch/s390/kvm/Makefile | 2 +-
>>> arch/s390/kvm/pci.c | 46 +++++++++++++++++++++++++++++++++
>>> 4 files changed, 79 insertions(+), 1 deletion(-)
>>> create mode 100644 arch/s390/include/asm/kvm_pci.h
>>> create mode 100644 arch/s390/kvm/pci.c
>>>
>>> diff --git a/arch/s390/include/asm/kvm_pci.h
>>> b/arch/s390/include/asm/kvm_pci.h
>>> new file mode 100644
>>> index 000000000000..aafee2976929
>>> --- /dev/null
>>> +++ b/arch/s390/include/asm/kvm_pci.h
>>> @@ -0,0 +1,29 @@
>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>> +/*
>>> + * KVM PCI Passthrough for virtual machines on s390
>>> + *
>>> + * Copyright IBM Corp. 2021
>>> + *
>>> + * Author(s): Matthew Rosato <mjrosato@...ux.ibm.com>
>>> + */
>>> +
>>> +
>>
>> One blank line too much.
>>
>> Otherwise, look good to me.
>>
>> Reviewed-by: Pierre Morel <pmorel@...ux.ibm.com>
>>
>>> +#ifndef ASM_KVM_PCI_H
>>> +#define ASM_KVM_PCI_H
>>> +
>>> +#include <linux/types.h>
>>> +#include <linux/kvm_types.h>
>>> +#include <linux/kvm_host.h>
>>> +#include <linux/kvm.h>
>>> +#include <linux/pci.h>
>>> +
>>> +struct kvm_zdev {
>>> + struct zpci_dev *zdev;
>>> + struct kvm *kvm;
>>> +};
>>> +
>>> +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);
>>> +
>>> +#endif /* ASM_KVM_PCI_H */
>>> diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
>>> index f3cd2da8128c..9b6c657d8d31 100644
>>> --- a/arch/s390/include/asm/pci.h
>>> +++ b/arch/s390/include/asm/pci.h
>>> @@ -97,6 +97,7 @@ struct zpci_bar_struct {
>>> };
>>> struct s390_domain;
>>> +struct kvm_zdev;
>>> #define ZPCI_FUNCTIONS_PER_BUS 256
>>> struct zpci_bus {
>>> @@ -190,6 +191,8 @@ struct zpci_dev {
>>> struct dentry *debugfs_dev;
>>> struct s390_domain *s390_domain; /* s390 IOMMU domain data */
>>> +
>>> + struct kvm_zdev *kzdev; /* passthrough data */
>>> };
>>> static inline bool zdev_enabled(struct zpci_dev *zdev)
>>> diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
>>> index b3aaadc60ead..a26f4fe7b680 100644
>>> --- a/arch/s390/kvm/Makefile
>>> +++ b/arch/s390/kvm/Makefile
>>> @@ -11,5 +11,5 @@ ccflags-y := -Ivirt/kvm -Iarch/s390/kvm
>>> kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o
>>> priv.o sigp.o
>>> kvm-objs += diag.o gaccess.o guestdbg.o vsie.o pv.o
>>> -
>>> +kvm-$(CONFIG_PCI) += pci.o
As discussed in other threads, I will look at changing this to
kvm-$(CONFIG_VFIO_PCI_ZDEV) += pci.o
Along with other IS_ENABLE(CONFIG_PCI) ->
IS_ENABLED(CONFIG_VFIO_PCI_ZDDEV) changes
>>> obj-$(CONFIG_KVM) += kvm.o
>>> diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
>>> new file mode 100644
>>> index 000000000000..1c33bc7bf2bd
>>> --- /dev/null
>>> +++ b/arch/s390/kvm/pci.c
>>> @@ -0,0 +1,46 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/*
>>> + * s390 kvm PCI passthrough support
>>> + *
>>> + * Copyright IBM Corp. 2021
>>> + *
>>> + * Author(s): Matthew Rosato <mjrosato@...ux.ibm.com>
>>> + */
>>> +
>>> +#include <linux/kvm_host.h>
>>> +#include <linux/pci.h>
>>> +#include <asm/kvm_pci.h>
>>> +
>>> +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;
>>> +}
>>> +EXPORT_SYMBOL_GPL(kvm_s390_pci_dev_open);
>>> +
>>> +void kvm_s390_pci_dev_release(struct zpci_dev *zdev)
>>> +{
>>> + struct kvm_zdev *kzdev;
>>> +
>>> + kzdev = zdev->kzdev;
>>> + WARN_ON(kzdev->zdev != zdev);
>>> + zdev->kzdev = 0;
>>> + kfree(kzdev);
>>> +}
>>> +EXPORT_SYMBOL_GPL(kvm_s390_pci_dev_release);
>>> +
>>> +void kvm_s390_pci_attach_kvm(struct zpci_dev *zdev, struct kvm *kvm)
>>> +{
>>> + struct kvm_zdev *kzdev = zdev->kzdev;
>>> +
>>> + kzdev->kvm = kvm;
>>> +}
>>> +EXPORT_SYMBOL_GPL(kvm_s390_pci_attach_kvm);
>>>
>>
>
> Working now on patch 24, I am not sure that this function is necessary.
> the only purpose seems to set kzdev->kvm = kvm while we already know
> kzdev in the caller.
>
Yep, as mentioned in the patch 24 thread I will drop this function and
set kzdev->kvm = kvm directly in patch 24.
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