linux-kernel - [PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs

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Date:	Tue, 26 Jul 2016 14:30:19 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	xen-devel@...ts.xenproject.org
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org,
	Stefano Stabellini <sstabellini@...nel.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Juergen Gross <jgross@...e.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Jan Beulich" <JBeulich@...e.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Julien Grall <julien.grall@....com>
Subject: [PATCH linux v3 0/9] xen: pvhvm: support bootup on secondary vCPUs

It may happen that Xen's and Linux's ideas of vCPU id diverge. In
particular, when we crash on a secondary vCPU we may want to do kdump
and unlike plain kexec where we do migrate_to_reboot_cpu() we try booting
on the vCPU which crashed. This doesn't work very well for PVHVM guests as
we have a number of hypercalls where we pass vCPU id as a parameter. These
hypercalls either fail or do something unexpected. To solve the issue we
need to have a mapping between Linux's and Xen's vCPU ids.

This series solves the issue for x86 PVHVM guests. PV guests don't (and
probably won't) support kdump so I always assume Xen's vCPU id == Linux's
vCPU id. ARM guests will probably need to get proper mapping once we start
supporting kexec/kdump there.

Changes since v2:
- Use 'uint32_t' for xen_vcpu_id mapping [Julien Grall]
- Rebased to linux-4.7

Changes since v1:
- "x86/acpi: store ACPI ids from MADT for future usage" patch added.
- Use ACPI ids instead of vLAPIC ids/2 [Andrew Cooper, Jan Beulich]
- Introduce xen_vcpu_nr() helper [David Vrabel].
- Modify all callers of HYPERVISOR_vcpu_op() instead of modifying
  HYPERVISOR_vcpu_op() [David Vrabel]

Vitaly Kuznetsov (9):
  x86/xen: update cpuid.h from Xen-4.7
  x86/acpi: store ACPI ids from MADT for future usage
  xen: introduce xen_vcpu_id mapping
  x86/xen: use xen_vcpu_id mapping for HYPERVISOR_vcpu_op
  x86/xen: use xen_vcpu_id mapping when pointing vcpu_info to the
    shared_info page
  xen/events: use xen_vcpu_id mapping in events_base
  xen/events: fifo: use xen_vcpu_id mapping
  xen/evtchn: use xen_vcpu_id mapping
  xen/pvhvm: run xen_vcpu_setup() for the boot CPU

 arch/arm/xen/enlighten.c         | 13 +++++++++++-
 arch/x86/include/asm/cpu.h       |  1 +
 arch/x86/include/asm/smp.h       |  2 ++
 arch/x86/include/asm/xen/cpuid.h |  5 ++++-
 arch/x86/kernel/acpi/boot.c      | 16 ++++++++++----
 arch/x86/kernel/apic/apic.c      |  2 ++
 arch/x86/kernel/setup_percpu.c   |  3 +++
 arch/x86/xen/enlighten.c         | 45 +++++++++++++++++++++++++++++++---------
 arch/x86/xen/irq.c               |  3 ++-
 arch/x86/xen/smp.c               | 18 +++++++++++-----
 arch/x86/xen/time.c              | 18 ++++++++++------
 arch/x86/xen/xen-ops.h           |  1 +
 drivers/xen/events/events_base.c | 13 ++++++------
 drivers/xen/events/events_fifo.c |  2 +-
 drivers/xen/evtchn.c             |  3 ++-
 drivers/xen/time.c               |  2 +-
 include/xen/xen-ops.h            |  6 ++++++
 17 files changed, 116 insertions(+), 37 deletions(-)

-- 
2.7.4