linux-kernel - [PATCH linux 0/8] xen: pvhvm: support bootup on secondary vCPUs

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Message-Id: <1467132449-1030-1-git-send-email-vkuznets@redhat.com>
Date:	Tue, 28 Jun 2016 18:47:21 +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>,
	Julien Grall <julien.grall@...rix.com>
Subject: [PATCH linux 0/8] 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.

Vitaly Kuznetsov (8):
  x86/xen: update cpuid.h from Xen-4.7
  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             | 10 ++++++++++
 arch/x86/include/asm/xen/cpuid.h     |  5 ++++-
 arch/x86/include/asm/xen/hypercall.h | 11 ++++++++++-
 arch/x86/xen/enlighten.c             | 35 ++++++++++++++++++++++++++++-------
 arch/x86/xen/smp.c                   |  7 +++++++
 arch/x86/xen/xen-ops.h               |  1 +
 drivers/xen/events/events_base.c     | 10 +++++-----
 drivers/xen/events/events_fifo.c     |  2 +-
 drivers/xen/evtchn.c                 |  2 +-
 include/xen/xen-ops.h                |  1 +
 10 files changed, 68 insertions(+), 16 deletions(-)

-- 
2.5.5