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qemu/include/hw/s390x/s390-pci-kvm.h

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s390x/pci: enable for load/store interpretation If the ZPCI_OP ioctl reports that is is available and usable, then the underlying KVM host will enable load/store intepretation for any guest device without a SHM bit in the guest function handle. For a device that will be using interpretation support, ensure the guest function handle matches the host function handle; this value is re-checked every time the guest issues a SET PCI FN to enable the guest device as it is the only opportunity to reflect function handle changes. By default, unless interpret=off is specified, interpretation support will always be assumed and exploited if the necessary ioctl and features are available on the host kernel. When these are unavailable, we will silently revert to the interception model; this allows existing guest configurations to work unmodified on hosts with and without zPCI interpretation support, allowing QEMU to choose the best support model available. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Thomas Huth <thuth@redhat.com> Message-Id: <20220902172737.170349-4-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:32 +03:00
/*
* s390 PCI KVM interfaces
*
* Copyright 2022 IBM Corp.
* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#ifndef HW_S390_PCI_KVM_H
#define HW_S390_PCI_KVM_H
s390x/pci: enable adapter event notification for interpreted devices Use the associated kvm ioctl operation to enable adapter event notification and forwarding for devices when requested. This feature will be set up with or without firmware assist based upon the 'forwarding_assist' setting. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Message-Id: <20220902172737.170349-6-mjrosato@linux.ibm.com> [thuth: Rename "forwarding_assist" property to "forwarding-assist"] Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:34 +03:00
#include "hw/s390x/s390-pci-bus.h"
#include "hw/s390x/s390-pci-inst.h"
s390x/pci: enable for load/store interpretation If the ZPCI_OP ioctl reports that is is available and usable, then the underlying KVM host will enable load/store intepretation for any guest device without a SHM bit in the guest function handle. For a device that will be using interpretation support, ensure the guest function handle matches the host function handle; this value is re-checked every time the guest issues a SET PCI FN to enable the guest device as it is the only opportunity to reflect function handle changes. By default, unless interpret=off is specified, interpretation support will always be assumed and exploited if the necessary ioctl and features are available on the host kernel. When these are unavailable, we will silently revert to the interception model; this allows existing guest configurations to work unmodified on hosts with and without zPCI interpretation support, allowing QEMU to choose the best support model available. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Thomas Huth <thuth@redhat.com> Message-Id: <20220902172737.170349-4-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:32 +03:00
#ifdef CONFIG_KVM
bool s390_pci_kvm_interp_allowed(void);
s390x/pci: enable adapter event notification for interpreted devices Use the associated kvm ioctl operation to enable adapter event notification and forwarding for devices when requested. This feature will be set up with or without firmware assist based upon the 'forwarding_assist' setting. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Message-Id: <20220902172737.170349-6-mjrosato@linux.ibm.com> [thuth: Rename "forwarding_assist" property to "forwarding-assist"] Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:34 +03:00
int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist);
int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev);
s390x/pci: enable for load/store interpretation If the ZPCI_OP ioctl reports that is is available and usable, then the underlying KVM host will enable load/store intepretation for any guest device without a SHM bit in the guest function handle. For a device that will be using interpretation support, ensure the guest function handle matches the host function handle; this value is re-checked every time the guest issues a SET PCI FN to enable the guest device as it is the only opportunity to reflect function handle changes. By default, unless interpret=off is specified, interpretation support will always be assumed and exploited if the necessary ioctl and features are available on the host kernel. When these are unavailable, we will silently revert to the interception model; this allows existing guest configurations to work unmodified on hosts with and without zPCI interpretation support, allowing QEMU to choose the best support model available. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Thomas Huth <thuth@redhat.com> Message-Id: <20220902172737.170349-4-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:32 +03:00
#else
static inline bool s390_pci_kvm_interp_allowed(void)
{
return false;
}
s390x/pci: enable adapter event notification for interpreted devices Use the associated kvm ioctl operation to enable adapter event notification and forwarding for devices when requested. This feature will be set up with or without firmware assist based upon the 'forwarding_assist' setting. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Message-Id: <20220902172737.170349-6-mjrosato@linux.ibm.com> [thuth: Rename "forwarding_assist" property to "forwarding-assist"] Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:34 +03:00
static inline int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib,
bool assist)
{
return -EINVAL;
}
static inline int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev)
{
return -EINVAL;
}
s390x/pci: enable for load/store interpretation If the ZPCI_OP ioctl reports that is is available and usable, then the underlying KVM host will enable load/store intepretation for any guest device without a SHM bit in the guest function handle. For a device that will be using interpretation support, ensure the guest function handle matches the host function handle; this value is re-checked every time the guest issues a SET PCI FN to enable the guest device as it is the only opportunity to reflect function handle changes. By default, unless interpret=off is specified, interpretation support will always be assumed and exploited if the necessary ioctl and features are available on the host kernel. When these are unavailable, we will silently revert to the interception model; this allows existing guest configurations to work unmodified on hosts with and without zPCI interpretation support, allowing QEMU to choose the best support model available. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Thomas Huth <thuth@redhat.com> Message-Id: <20220902172737.170349-4-mjrosato@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-09-02 20:27:32 +03:00
#endif
#endif
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