kernel.git/drivers/hv/hv.c, branch linux-4.4.y

Drivers: hv: vmbus: fix build warning

2018-02-25T10:03:46Z

commit 9220e39b5c900c67ddcb517d52fe52d90fb5e3c8 upstream. We were getting build warning about unused variable "tsc_msr" and "va_tsc" while building for i386 allmodconfig. Signed-off-by: Sudip Mukherjee Signed-off-by: Greg Kroah-Hartman

x86/retpoline/hyperv: Convert assembler indirect jumps

2018-01-23T18:50:13Z

commit e70e5892b28c18f517f29ab6e83bd57705104b31 upstream. Convert all indirect jumps in hyperv inline asm code to use non-speculative sequences when CONFIG_RETPOLINE is enabled. Signed-off-by: David Woodhouse Signed-off-by: Thomas Gleixner Acked-by: Arjan van de Ven Acked-by: Ingo Molnar Cc: gnomes@lxorguk.ukuu.org.uk Cc: Rik van Riel Cc: Andi Kleen Cc: Josh Poimboeuf Cc: thomas.lendacky@amd.com Cc: Peter Zijlstra Cc: Linus Torvalds Cc: Jiri Kosina Cc: Andy Lutomirski Cc: Dave Hansen Cc: Kees Cook Cc: Tim Chen Cc: Greg Kroah-Hartman Cc: Paul Turner Link: https://lkml.kernel.org/r/1515707194-20531-9-git-send-email-dwmw@amazon.co.uk [ backport to 4.4, hopefully correct, not tested... - gregkh ] Signed-off-by: Greg Kroah-Hartman

hv: don't reset hv_context.tsc_page on crash

2017-04-27T07:09:34Z

commit 56ef6718a1d8d77745033c5291e025ce18504159 upstream. It may happen that secondary CPUs are still alive and resetting hv_context.tsc_page will cause a consequent crash in read_hv_clock_tsc() as we don't check for it being not NULL there. It is safe as we're not freeing this page anyways. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Sumit Semwal Signed-off-by: Greg Kroah-Hartman

Drivers: hv: avoid vfree() on crash

2017-03-26T10:13:18Z

commit a9f61ca793becabdefab03b77568d6c6f8c1bc79 upstream. When we crash from NMI context (e.g. after NMI injection from host when 'sysctl -w kernel.unknown_nmi_panic=1' is set) we hit kernel BUG at mm/vmalloc.c:1530! as vfree() is denied. While the issue could be solved with in_nmi() check instead I opted for skipping vfree on all sorts of crashes to reduce the amount of work which can cause consequent crashes. We don't really need to free anything on crash. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Cc: Sumit Semwal Signed-off-by: Greg Kroah-Hartman

drivers: hv: Turn off write permission on the hypercall page

2017-03-15T01:57:15Z

commit 372b1e91343e657a7cc5e2e2bcecd5140ac28119 upstream. The hypercall page only needs to be executable but currently it is setup to be writable as well. Fix the issue. Signed-off-by: K. Y. Srinivasan Acked-by: Kees Cook Reported-by: Stephen Hemminger Tested-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman

hv: init percpu_list in hv_synic_alloc()

2017-03-12T05:37:29Z

commit 3c7630d35009e6635e5b58d62de554fd5b6db5df upstream. Initializing hv_context.percpu_list in hv_synic_alloc() helps to prevent a crash in percpu_channel_enq() when not all CPUs were online during initialization and it naturally belongs there. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman

hv: allocate synic pages for all present CPUs

2017-03-12T05:37:29Z

commit 421b8f20d3c381b215f988b42428f56fc3b82405 upstream. It may happen that not all CPUs are online when we do hv_synic_alloc() and in case more CPUs come online later we may try accessing these allocated structures. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman

Drivers: hv: vmbus: don't manipulate with clocksources on crash

2016-09-15T06:27:46Z

[ Upstream commit 3ccb4fd8f492f99aece21acc1bd6142275f26236 ] clocksource_change_rating() involves mutex usage and can't be called in interrupt context. It also makes sense to avoid doing redundant work on crash. Signed-off-by: Vitaly Kuznetsov Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

Drivers: hv: vmbus: Implement a clocksource based on the TSC page

2015-08-05T18:44:29Z

The current Hyper-V clock source is based on the per-partition reference counter and this counter is being accessed via s synthetic MSR - HV_X64_MSR_TIME_REF_COUNT. Hyper-V has a more efficient way of computing the per-partition reference counter value that does not involve reading a synthetic MSR. We implement a time source based on this mechanism. Tested-by: Vivek Yadav Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman

drivers/hv: Migrate to new 'set-state' interface

2015-08-05T18:44:29Z

Migrate hv driver to the new 'set-state' interface provided by clockevents core, the earlier 'set-mode' interface is marked obsolete now. This also enables us to implement callbacks for new states of clockevent devices, for example: ONESHOT_STOPPED. Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: devel@linuxdriverproject.org Signed-off-by: Viresh Kumar Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman