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Sean Christopherson 3244867af8 KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req 
Do not bail early if there are no bits set in the sparse banks for a
non-sparse, a.k.a. "all CPUs", IPI request.  Per the Hyper-V spec, it is
legal to have a variable length of '0', e.g. VP_SET's BankContents in
this case, if the request can be serviced without the extra info.

  It is possible that for a given invocation of a hypercall that does
  accept variable sized input headers that all the header input fits
  entirely within the fixed size header. In such cases the variable sized
  input header is zero-sized and the corresponding bits in the hypercall
  input should be set to zero.

Bailing early results in KVM failing to send IPIs to all CPUs as expected
by the guest.

Fixes: 214ff83d44 ("KVM: x86: hyperv: implement PV IPI send hypercalls")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20211207220926.718794-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-12-10 07:12:42 -05:00
..
alpha futex: Wireup futex_waitv syscall 2021-11-25 14:26:12 +01:00
arc Add linux/cacheflush.h 2021-11-17 10:36:15 -05:00
arm ARM: SoC fixes for v5.16, part 2 2021-11-25 10:31:37 -08:00
arm64 arm64 fixes for -rc4 2021-12-03 10:50:14 -08:00
csky asm-generic: asm/syscall.h cleanup 2021-11-10 11:22:03 -08:00
h8300 Kbuild updates for v5.16 2021-11-08 09:15:45 -08:00
hexagon hexagon: ignore vmlinux.lds 2021-11-20 10:35:54 -08:00
ia64 futex: Wireup futex_waitv syscall 2021-11-25 14:26:12 +01:00
m68k asm-generic: syscall table updates 2021-11-25 10:41:28 -08:00
microblaze futex: Wireup futex_waitv syscall 2021-11-25 14:26:12 +01:00
mips - build fix for ZSTD enabled configs 2021-11-27 09:50:31 -08:00
nds32 Add linux/cacheflush.h 2021-11-17 10:36:15 -05:00
nios2 Add linux/cacheflush.h 2021-11-17 10:36:15 -05:00
openrisc Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
parisc parisc: Mark cr16 CPU clocksource unstable on all SMP machines 2021-12-04 21:36:04 +01:00
powerpc powerpc fixes for 5.16 #3 2021-11-27 10:06:15 -08:00
riscv RISC-V: KVM: Fix incorrect KVM_MAX_VCPUS value 2021-11-22 10:36:19 +05:30
s390 s390: update defconfigs 2021-12-02 19:29:44 +01:00
sh asm-generic: syscall table updates 2021-11-25 10:41:28 -08:00
sparc asm-generic: syscall table updates 2021-11-25 10:41:28 -08:00
um Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
x86 KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req 2021-12-10 07:12:42 -05:00
xtensa asm-generic: syscall table updates 2021-11-25 10:41:28 -08:00
.gitignore
Kconfig arch: Add generic Kconfig option indicating page size smaller than 64k 2021-11-27 14:34:41 -08:00