linux.git/arch/x86/kernel/cpu/mshyperv.c, branch v5.10

Drivers: hv: vmbus: Add parsing of VMbus interrupt in ACPI DSDT

2020-10-14T19:14:51+00:00

On ARM64, Hyper-V now specifies the interrupt to be used by VMbus
in the ACPI DSDT.  This information is not used on x86 because the
interrupt vector must be hardcoded.  But update the generic
VMbus driver to do the parsing and pass the information to the
architecture specific code that sets up the Linux IRQ.  Update
consumers of the interrupt to get it from an architecture specific
function.

Signed-off-by: Michael Kelley 
Link: https://lore.kernel.org/r/1597434304-40631-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu

x86/hyperv: Remove aliases with X64 in their name

2020-09-28T09:01:07+00:00

In the architecture independent version of hyperv-tlfs.h, commit c55a844f46f958b
removed the "X64" in the symbol names so they would make sense for both x86 and
ARM64.  That commit added aliases with the "X64" in the x86 version of hyperv-tlfs.h
so that existing x86 code would continue to compile.

As a cleanup, update the x86 code to use the symbols without the "X64", then remove
the aliases.  There's no functional change.

Signed-off-by: Joseph Salisbury 
Link: https://lore.kernel.org/r/1601130386-11111-1-git-send-email-jsalisbury@linux.microsoft.com
Reviewed-by: Michael Kelley 
Acked-by: Paolo Bonzini 
Signed-off-by: Wei Liu

x86/hyperv: Make hv_setup_sched_clock inline

2020-08-11T10:41:15+00:00

Make hv_setup_sched_clock inline so the reference to pv_ops works
correctly with objtool updates to detect noinstr violations.
See https://lore.kernel.org/patchwork/patch/1283635/

Signed-off-by: Michael Kelley 
Acked-by: Peter Zijlstra (Intel) 
Acked-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/1597022991-24088-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu

x86/entry: Convert various hypervisor vectors to IDTENTRY_SYSVEC

2020-06-11T13:15:15+00:00

Convert various hypervisor vectors to IDTENTRY_SYSVEC:

  - Implement the C entry point with DEFINE_IDTENTRY_SYSVEC
  - Emit the ASM stub with DECLARE_IDTENTRY_SYSVEC
  - Remove the ASM idtentries in 64-bit
  - Remove the BUILD_INTERRUPT entries in 32-bit
  - Remove the old prototypes

No functional change.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar 
Acked-by: Andy Lutomirski 
Reviewed-by: Wei Liu 
Link: https://lore.kernel.org/r/20200521202119.647997594@linutronix.de

x86/Hyper-V: Report crash register data or kmsg before running crash kernel

2020-04-11T16:19:06+00:00

We want to notify Hyper-V when a Linux guest VM crash occurs, so
there is a record of the crash even when kdump is enabled.   But
crash_kexec_post_notifiers defaults to "false", so the kdump kernel
runs before the notifiers and Hyper-V never gets notified.  Fix this by
always setting crash_kexec_post_notifiers to be true for Hyper-V VMs.

Fixes: 81b18bce48af ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic")
Reviewed-by: Michael Kelley 
Signed-off-by: Tianyu Lan 
Link: https://lore.kernel.org/r/20200406155331.2105-5-Tianyu.Lan@microsoft.com
Signed-off-by: Wei Liu

x86: hyperv: report value of misc_features

2020-04-09T16:31:50+00:00

A few kernel features depend on ms_hyperv.misc_features, but unlike its
siblings ->features and ->hints, the value was never reported during boot.

Signed-off-by: Olaf Hering 
Link: https://lore.kernel.org/r/20200407172739.31371-1-olaf@aepfle.de
Signed-off-by: Wei Liu

Merge branch 'linus' into x86/hyperv

2019-11-15T09:30:50+00:00

Pick up upstream fixes to avoid conflicts.

x86/hyperv: Allow guests to enable InvariantTSC

2019-11-12T10:44:21+00:00

If the hardware supports TSC scaling, Hyper-V will set bit 15 of the
HV_PARTITION_PRIVILEGE_MASK in guest VMs with a compatible Hyper-V
configuration version.  Bit 15 corresponds to the
AccessTscInvariantControls privilege.  If this privilege bit is set,
guests can access the HvSyntheticInvariantTscControl MSR: guests can
set bit 0 of this synthetic MSR to enable the InvariantTSC feature.
After setting the synthetic MSR, CPUID will enumerate support for
InvariantTSC.

Signed-off-by: Andrea Parri 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Michael Kelley 
Reviewed-by: Vitaly Kuznetsov 
Link: https://lkml.kernel.org/r/20191003155200.22022-1-parri.andrea@gmail.com

x86/hyperv: Set pv_info.name to "Hyper-V"

2019-10-18T11:33:38+00:00

Michael reported that the x86/hyperv initialization code prints the
following dmesg when running in a VM on Hyper-V:

  [    0.000738] Booting paravirtualized kernel on bare hardware

Let the x86/hyperv initialization code set pv_info.name to "Hyper-V" so
dmesg reports correctly:

  [    0.000172] Booting paravirtualized kernel on Hyper-V

[ tglx: Folded build fix provided by Yue ]

Reported-by: Michael Kelley 
Signed-off-by: Andrea Parri 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Wei Liu 
Reviewed-by: Michael Kelley 
Cc: YueHaibing 
Link: https://lkml.kernel.org/r/20191015103502.13156-1-parri.andrea@gmail.com

x86/hyperv: Hide pv_ops access for CONFIG_PARAVIRT=n

2019-08-28T10:25:06+00:00

hv_setup_sched_clock() references pv_ops which is only available when
CONFIG_PARAVIRT=Y.

Wrap it into a #ifdef

Signed-off-by: Tianyu Lan 
Signed-off-by: Thomas Gleixner 
Link: https://lkml.kernel.org/r/20190828080747.204419-1-Tianyu.Lan@microsoft.com