Re: [PATCH v3 00/37] vfio: Adopt iommufd

[Markus Armbruster <armbru@redhat.com>]

Zhenzhong Duan <zhenzhong.duan@intel.com> writes:

> Hi,
>
> Thanks all for giving guides and comments on previous series, here is
> the v3 of pure iommufd support part.
>
> Based on Cédric's suggestion, this series includes an effort to remove
> spapr code from container.c, now all spapr functions are moved to spapr.c
> or spapr_pci_vfio.c, but there are still a few trival check on
> VFIO_SPAPR_TCE_*_IOMMU which I am not sure if deserved to introduce many
> callbacks and duplicate code just to remove them. Some functions are moved
> to spapr.c instead of spapr_pci_vfio.c to avoid compile issue because
> spapr_pci_vfio.c is arch specific, or else we need to introduce stub
> functions to those spapr functions moved.

[...]

> qemu code: https://github.com/yiliu1765/qemu/commits/zhenzhong/iommufd_cdev_v3
> Based on vfio-next, commit id: fd0e1c8bc1

I fetched this, and get several compile errors with Clang (but not with
GCC):

    FAILED: libqemu-x86_64-softmmu.fa.p/hw_vfio_common.c.o 
    clang -m64 -mcx16 -Ilibqemu-x86_64-softmmu.fa.p -I. -I.. -Itarget/i386 -I../target/i386 -Iqapi -Itrace -Iui -Iui/shader -I/usr/include/pixman-1 -I/usr/include/capstone -I/usr/include/spice-server -I/usr/include/spice-1 -I/usr/include/cacard -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -I/usr/include/nss3 -I/usr/include/nspr4 -I/usr/include/PCSC -fcolor-diagnostics -Wall -Winvalid-pch -Werror -std=gnu11 -O2 -g -fstack-protector-strong -Wundef -Wwrite-strings -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels -Wexpansion-to-defined -Wmissing-format-attribute -Wno-initializer-overrides -Wno-missing-include-dirs -Wno-shift-negative-value -Wno-string-plus-int -Wno-typedef-redefinition -Wno-tautological-type-limit-compare -Wno-psabi -Wno-gnu-variable-sized-type-not-at-end -Wthread-safety -isystem /work/armbru/qemu/linux-headers -isystem linux-headers -iquote . -iquote /work/armbru/qemu -iquote /work/armbru/qemu/include -iquote /work/armbru/qemu/host/include/x86_64 -iquote /work/armbru/qemu/host/include/generic -iquote /work/armbru/qemu/tcg/i386 -pthread -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fno-common -fwrapv -fsanitize-coverage-allowlist=instrumentation-filter -fsanitize=fuzzer-no-link -fPIE -isystem../linux-headers -isystemlinux-headers -DNEED_CPU_H '-DCONFIG_TARGET="x86_64-softmmu-config-target.h"' '-DCONFIG_DEVICES="x86_64-softmmu-config-devices.h"' -MD -MQ libqemu-x86_64-softmmu.fa.p/hw_vfio_common.c.o -MF libqemu-x86_64-softmmu.fa.p/hw_vfio_common.c.o.d -o libqemu-x86_64-softmmu.fa.p/hw_vfio_common.c.o -c ../hw/vfio/common.c
    ../hw/vfio/common.c:682:40: error: variable 'hostwin' is uninitialized when used here [-Werror,-Wuninitialized]
            hwaddr pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
                                           ^~~~~~~
    ../hw/vfio/common.c:578:31: note: initialize the variable 'hostwin' to silence this warning
        VFIOHostDMAWindow *hostwin;
                                  ^
                                   = NULL
    ../hw/vfio/common.c:785:33: error: variable 'hostwin' is uninitialized when used here [-Werror,-Wuninitialized]
            pgmask = (1ULL << ctz64(hostwin->iova_pgsizes)) - 1;
                                    ^~~~~~~
    ../hw/vfio/common.c:783:35: note: initialize the variable 'hostwin' to silence this warning
            VFIOHostDMAWindow *hostwin;
                                      ^
                                       = NULL
    2 errors generated.
    FAILED: tests/unit/test-resv-mem.p/test-resv-mem.c.o 
    clang -m64 -mcx16 -Itests/unit/test-resv-mem.p -Itests/unit -I../tests/unit -I. -Iqapi -Itrace -Iui -Iui/shader -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/sysprof-4 -fcolor-diagnostics -Wall -Winvalid-pch -Werror -std=gnu11 -O2 -g -fstack-protector-strong -Wundef -Wwrite-strings -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels -Wexpansion-to-defined -Wmissing-format-attribute -Wno-initializer-overrides -Wno-missing-include-dirs -Wno-shift-negative-value -Wno-string-plus-int -Wno-typedef-redefinition -Wno-tautological-type-limit-compare -Wno-psabi -Wno-gnu-variable-sized-type-not-at-end -Wthread-safety -isystem /work/armbru/qemu/linux-headers -isystem linux-headers -iquote . -iquote /work/armbru/qemu -iquote /work/armbru/qemu/include -iquote /work/armbru/qemu/host/include/x86_64 -iquote /work/armbru/qemu/host/include/generic -iquote /work/armbru/qemu/tcg/i386 -pthread -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fno-common -fwrapv -fsanitize-coverage-allowlist=instrumentation-filter -fsanitize=fuzzer-no-link -fPIE -MD -MQ tests/unit/test-resv-mem.p/test-resv-mem.c.o -MF tests/unit/test-resv-mem.p/test-resv-mem.c.o.d -o tests/unit/test-resv-mem.p/test-resv-mem.c.o -c ../tests/unit/test-resv-mem.c
    ../tests/unit/test-resv-mem.c:42:9: error: variable 'i' set but not used [-Werror,-Wunused-but-set-variable]
        int i = 0;
            ^
    1 error generated.

Delete @i, please.