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linux-next/arch/x86/hyperv
Marcelo Henrique Cerri ab7ff471aa x86/hyperv: Fix hypercalls with extended CPU ranges for TLB flushing
Do not consider the fixed size of hv_vp_set when passing the variable
header size to hv_do_rep_hypercall().

The Hyper-V hypervisor specification states that for a hypercall with a
variable header only the size of the variable portion should be supplied
via the input control.

For HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX/LIST_EX calls that means the
fixed portion of hv_vp_set should not be considered.

That fixes random failures of some applications that are unexpectedly
killed with SIGBUS or SIGSEGV.

Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jork Loeser <Jork.Loeser@microsoft.com>
Cc: Josh Poulson <jopoulso@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Xiao <sixiao@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: devel@linuxdriverproject.org
Fixes: 628f54cc64 ("x86/hyper-v: Support extended CPU ranges for TLB flush hypercalls")
Link: http://lkml.kernel.org/r/1507210469-29065-1-git-send-email-marcelo.cerri@canonical.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-10-10 12:54:56 +02:00
..
hv_init.c x86/hyperv: Clear vCPU banks between calls to avoid flushing unneeded vCPUs 2017-10-10 12:53:00 +02:00
Makefile x86/hyper-v: Use hypercall for remote TLB flush 2017-08-10 20:16:44 +02:00
mmu.c x86/hyperv: Fix hypercalls with extended CPU ranges for TLB flushing 2017-10-10 12:54:56 +02:00