linux.git/arch/x86/hyperv, branch v5.1

x86/hyperv: Prevent potential NULL pointer dereference

2019-03-21T11:24:39+00:00

The page allocation in hv_cpu_init() can fail, but the code does not
have a check for that.

Add a check and return -ENOMEM when the allocation fails.

[ tglx: Massaged changelog ]

Signed-off-by: Kangjie Lu 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Mukesh Ojha 
Acked-by: "K. Y. Srinivasan" 
Cc: pakki001@umn.edu
Cc: Haiyang Zhang 
Cc: Stephen Hemminger 
Cc: Sasha Levin 
Cc: Borislav Petkov 
Cc: "H. Peter Anvin" 
Cc: linux-hyperv@vger.kernel.org
Link: https://lkml.kernel.org/r/20190314054651.1315-1-kjlu@umn.edu

Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-03-10T21:46:56+00:00

Pull x86 fixes from Thomas Gleixner:
 "A set of fixes for x86:

   - Make the unwinder more robust when it encounters a NULL pointer
     call, so the backtrace becomes more useful

   - Fix the bogus ORC unwind table alignment

   - Prevent kernel panic during kexec on HyperV caused by a cleared but
     not disabled hypercall page.

   - Remove the now pointless stacksize increase for KASAN_EXTRA, as
     KASAN_EXTRA is gone.

   - Remove unused variables from the x86 memory management code"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/hyperv: Fix kernel panic when kexec on HyperV
  x86/mm: Remove unused variable 'old_pte'
  x86/mm: Remove unused variable 'cpu'
  Revert "x86_64: Increase stack size for KASAN_EXTRA"
  x86/unwind: Add hardcoded ORC entry for NULL
  x86/unwind: Handle NULL pointer calls better in frame unwinder
  x86/unwind/orc: Fix ORC unwind table alignment

x86/hyperv: Fix kernel panic when kexec on HyperV

2019-03-06T22:27:44+00:00

After commit 68bb7bfb7985 ("X86/Hyper-V: Enable IPI enlightenments"),
kexec fails with a kernel panic:

kexec_core: Starting new kernel
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v3.0 03/02/2018
RIP: 0010:0xffffc9000001d000

Call Trace:
 ? __send_ipi_mask+0x1c6/0x2d0
 ? hv_send_ipi_mask_allbutself+0x6d/0xb0
 ? mp_save_irq+0x70/0x70
 ? __ioapic_read_entry+0x32/0x50
 ? ioapic_read_entry+0x39/0x50
 ? clear_IO_APIC_pin+0xb8/0x110
 ? native_stop_other_cpus+0x6e/0x170
 ? native_machine_shutdown+0x22/0x40
 ? kernel_kexec+0x136/0x156

That happens if hypercall based IPIs are used because the hypercall page is
reset very early upon kexec reboot, but kexec sends IPIs to stop CPUs,
which invokes the hypercall and dereferences the unusable page.

To fix his, reset hv_hypercall_pg to NULL before the page is reset to avoid
any misuse, IPI sending will fall back to the non hypercall based
method. This only happens on kexec / kdump so just setting the pointer to
NULL is good enough.

Fixes: 68bb7bfb7985 ("X86/Hyper-V: Enable IPI enlightenments")
Signed-off-by: Kairui Song 
Signed-off-by: Thomas Gleixner 
Cc: "K. Y. Srinivasan" 
Cc: Haiyang Zhang 
Cc: Stephen Hemminger 
Cc: Sasha Levin 
Cc: Borislav Petkov 
Cc: "H. Peter Anvin" 
Cc: Vitaly Kuznetsov 
Cc: Dave Young 
Cc: devel@linuxdriverproject.org
Link: https://lkml.kernel.org/r/20190306111827.14131-1-kasong@redhat.com

PCI: hv: Refactor hv_irq_unmask() to use cpumask_to_vpset()

2019-03-01T11:45:46+00:00

Remove the duplicate implementation of cpumask_to_vpset() and use the
shared implementation. Export hv_max_vp_index, which is required by
cpumask_to_vpset().

Signed-off-by: Maya Nakamura 
Signed-off-by: Lorenzo Pieralisi 
Reviewed-by: Michael Kelley 
Reviewed-by: Vitaly Kuznetsov 
Tested-by: Vitaly Kuznetsov

x86/hyper-v: Add HvFlushGuestAddressList hypercall support

2018-12-21T10:28:39+00:00

Hyper-V provides HvFlushGuestAddressList() hypercall to flush EPT tlb
with specified ranges. This patch is to add the hypercall support.

Reviewed-by:  Michael Kelley 
Signed-off-by: Lan Tianyu 
Signed-off-by: Paolo Bonzini

Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2018-10-23T16:54:58+00:00

Pull x86 paravirt updates from Ingo Molnar:
 "Two main changes:

   - Remove no longer used parts of the paravirt infrastructure and put
     large quantities of paravirt ops under a new config option
     PARAVIRT_XXL=y, which is selected by XEN_PV only. (Joergen Gross)

   - Enable PV spinlocks on Hyperv (Yi Sun)"

* 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/hyperv: Enable PV qspinlock for Hyper-V
  x86/hyperv: Add GUEST_IDLE_MSR support
  x86/paravirt: Clean up native_patch()
  x86/paravirt: Prevent redefinition of SAVE_FLAGS macro
  x86/xen: Make xen_reservation_lock static
  x86/paravirt: Remove unneeded mmu related paravirt ops bits
  x86/paravirt: Move the Xen-only pv_mmu_ops under the PARAVIRT_XXL umbrella
  x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella
  x86/paravirt: Move the Xen-only pv_cpu_ops under the PARAVIRT_XXL umbrella
  x86/paravirt: Move items in pv_info under PARAVIRT_XXL umbrella
  x86/paravirt: Introduce new config option PARAVIRT_XXL
  x86/paravirt: Remove unused paravirt bits
  x86/paravirt: Use a single ops structure
  x86/paravirt: Remove clobbers from struct paravirt_patch_site
  x86/paravirt: Remove clobbers parameter from paravirt patch functions
  x86/paravirt: Make paravirt_patch_call() and paravirt_patch_jmp() static
  x86/xen: Add SPDX identifier in arch/x86/xen files
  x86/xen: Link platform-pci-unplug.o only if CONFIG_XEN_PVHVM
  x86/xen: Move pv specific parts of arch/x86/xen/mmu.c to mmu_pv.c
  x86/xen: Move pv irq related functions under CONFIG_XEN_PV umbrella

x86/hyperv: Enable PV qspinlock for Hyper-V

2018-10-09T12:21:39+00:00

Implement the required wait and kick callbacks to support PV spinlocks in
Hyper-V guests.

[ tglx: Document the requirement for disabling interrupts in the wait()
  	callback. Remove goto and unnecessary includes. Add prototype
	for hv_vcpu_is_preempted(). Adapted to pending paravirt changes. ]

Signed-off-by: Yi Sun 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Juergen Gross 
Cc: "K. Y. Srinivasan" 
Cc: Haiyang Zhang 
Cc: Stephen Hemminger 
Cc: Michael Kelley (EOSG) 
Cc: chao.p.peng@intel.com
Cc: chao.gao@intel.com
Cc: isaku.yamahata@intel.com
Cc: tianyu.lan@microsoft.com
Link: https://lkml.kernel.org/r/1538987374-51217-3-git-send-email-yi.y.sun@linux.intel.com

x86/hyperv: Remove unused include

2018-09-27T19:21:00+00:00

Remove including . It's not needed.

Signed-off-by: YueHaibing 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Michael Kelley 
Cc: "K. Y. Srinivasan" 
Cc: Haiyang Zhang 
Cc: Stephen Hemminger 
Cc: "H. Peter Anvin" 
Cc: 
Cc: 
Link: https://lkml.kernel.org/r/1537690822-97455-1-git-send-email-yuehaibing@huawei.com

x86/hyperv: Suppress "PCI: Fatal: No config space access function found"

2018-09-27T19:19:14+00:00

A Generation-2 Linux VM on Hyper-V doesn't have the legacy PCI bus, and
users always see the scary warning, which is actually harmless.

Suppress it.

Signed-off-by: Dexuan Cui 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Michael Kelley 
Cc: "H. Peter Anvin" 
Cc: KY Srinivasan 
Cc: Haiyang Zhang 
Cc: Stephen Hemminger 
Cc: "devel@linuxdriverproject.org" 
Cc: Olaf Aepfle 
Cc: Andy Whitcroft 
Cc: Jason Wang 
Cc: Vitaly Kuznetsov 
Cc: Marcelo Cerri 
Cc: Josh Poulson 
Link: https://lkml.kernel.org/r/

x86/hyper-v: rename ipi_arg_{ex,non_ex} structures

2018-09-19T22:51:42+00:00

These structures are going to be used from KVM code so let's make
their names reflect their Hyper-V origin.

Signed-off-by: Vitaly Kuznetsov 
Reviewed-by: Roman Kagan 
Acked-by: K. Y. Srinivasan 
Signed-off-by: Paolo Bonzini