[PATCH kvmtool v2 0/7] x86 compilation fixes and arm64 PMU improvements

[Alexandru Elisei]

v1 here [1].

v1 was sent to fix this compilation error:

disk/core.c: In function ‘disk_img_name_parser’:
disk/core.c:27:21: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
   27 |                 sep = strstr(arg, ":");
      |                     ^

fixed in patches #2 and #3.

Working on v2 found another one:

x86/include/kvm/bios.h:91:43: error: ‘regparm’ attribute ignored [-Werror=attributes]
   91 | extern bioscall void int10_handler(struct biosregs *regs);
      |                                           ^~~~~~~~

which is fixed in patch #1.

The remaining of the patches are there to improve PMU initialisation and
error reporting.

Tested on arm64, with and without hugetlbfs, with and without a PMU. Also
tested on arm64 using scsi-virtio (got it working in v2, I couldn't get
scsi-virtio working for v1, most likely user error).

Tested on x86_64 by booting a VM. Don't have an x86_32 machine to do the
same, but I did cross-compile for x86_32.

Changes in v2:

- Patch #1 ("x86: Define bioscall only in 32-bit mode") is new. The bug
  that it fixes was probably triggered when I updated the gcc compiler.

- pmu__init() is now called from gic__init_gic() (Will).

- die_perror() prints the original errno is vsnprintf() fails (Will).

[1] https://lore.kernel.org/kvm/20260323150221.49256-1-alexandru.elisei@arm.com/

Alexandru Elisei (7):
  x86: Define bioscall only in 32-bit mode
  virtio: Do not modify const strings in virtio_9p_rootdir_parser()
  disk/core: Do not modify const strings in disk_img_name_parser()
  arm64: Initialise the PMU after the GIC
  util: Set exit status to errno in die_perror()
  util: Allow die_perror() to take a variable list of argument
  arm64: Improve KVM_ARM_VCPU_PMU_V3_CTRL diagnostics

 arm64/gic.c              |  9 +++++-
 arm64/include/asm/pmu.h  |  3 ++
 arm64/pmu.c              | 59 ++++++++++++++++++++++++++++------------
 disk/core.c              | 44 ++++++++++++++++++++----------
 include/kvm/disk-image.h |  6 ++--
 include/kvm/util.h       |  2 +-
 util/util.c              | 21 ++++++++++++--
 virtio/9p.c              | 21 +++++++++-----
 x86/include/kvm/bios.h   |  4 +++
 9 files changed, 123 insertions(+), 46 deletions(-)


base-commit: 6c2de8d9531c7e9aad7ac6701e848bedb3f1d3a4
-- 
2.54.0