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util: Add functions for s390x mmio read/write

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Starting with z15 (or newer) we can execute mmio
instructions from userspace. On older platforms
where we don't have these instructions available
we can fallback to using system calls to access
the PCI mapped resources.

This patch adds helper functions for mmio reads
and writes for s390x.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Message-id: 20250430185012.2303-2-alifm@linux.ibm.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Farhan Ali 2025-04-30 11:50:10 -07:00 • committed by Stefan Hajnoczi
parent 57b6f8d07f
commit b17d69a1da
3 changed files with 172 additions and 0 deletions
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2
util/meson.build
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@ -131,4 +131,6 @@ elif cpu in ['ppc', 'ppc64']
util_ss.add(files('cpuinfo-ppc.c'))
elif cpu in ['riscv32', 'riscv64']
util_ss.add(files('cpuinfo-riscv.c'))
elif cpu == 's390x'
util_ss.add(files('s390x_pci_mmio.c'))
endif