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s390x/pci: enable for load/store interpretation

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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>
This commit is contained in:
Matthew Rosato 2022-09-02 13:27:32 -04:00 • committed by Thomas Huth
parent 21fa15298d
commit dd1d5fd968
8 changed files with 137 additions and 1 deletions
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24
include/hw/s390x/s390-pci-kvm.h Normal file
View file

@ -0,0 +1,24 @@
/*
* 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
#ifdef CONFIG_KVM
bool s390_pci_kvm_interp_allowed(void);
#else
static inline bool s390_pci_kvm_interp_allowed(void)
{
return false;
}
#endif
#endif