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Paolo Bonzini 3ec5ad4008 target/i386: kvm: do not access uninitialized variable on older kernels 
KVM support for AMX includes a new system attribute, KVM_X86_XCOMP_GUEST_SUPP.
Commit 19db68ca68 ("x86: Grant AMX permission for guest", 2022-03-15) however
did not fully consider the behavior on older kernels.  First, it warns
too aggressively.  Second, it invokes the KVM_GET_DEVICE_ATTR ioctl
unconditionally and then uses the "bitmask" variable, which remains
uninitialized if the ioctl fails.  Third, kvm_ioctl returns -errno rather
than -1 on errors.

While at it, explain why the ioctl is needed and KVM_GET_SUPPORTED_CPUID
is not enough.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-03-20 20:38:52 +01:00
..
alpha target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
arm target-arm queue: 2022-03-08 15:26:10 +00:00
avr target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
cris target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
hexagon target/hexagon: remove unused variable 2022-03-12 09:14:22 -08:00
hppa target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
i386 target/i386: kvm: do not access uninitialized variable on older kernels 2022-03-20 20:38:52 +01:00
m68k target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
microblaze target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
mips MIPS patches queue 2022-03-09 09:13:39 +00:00
nios2 target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
openrisc target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
ppc target/ppc: fix xxspltw for big endian hosts 2022-03-14 15:57:17 +01:00
riscv target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
rx target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
s390x target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
sh4 target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
sparc target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
tricore target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
xtensa target: Use ArchCPU as interface to target CPU 2022-03-06 22:23:09 +01:00
Kconfig meson: Introduce target-specific Kconfig 2021-07-09 18:21:34 +02:00
meson.build Drop the deprecated unicore32 target 2021-05-12 18:20:52 +02:00