[PATCH 00/15] KVM: Add Xen hypercall and shared info pages

From: David Woodhouse <dwmw2@infradead.org>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Ankur Arora <ankur.a.arora@oracle.com>,
	Joao Martins <joao.m.martins@oracle.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Sean Christopherson <seanjc@google.com>
Subject: [PATCH 00/15] KVM: Add Xen hypercall and shared info pages
Date: Fri,  4 Dec 2020 01:18:33 +0000	[thread overview]
Message-ID: <20201204011848.2967588-1-dwmw2@infradead.org> (raw)

Reviving the first section (so far) of a patch set that Joao posted as 
RFC last year:

https://lore.kernel.org/kvm/20190220201609.28290-1-joao.m.martins@oracle.com/

This adds basic hypercall interception support, and adds support for
timekeeping and runstate-related shared info regions.

I've updated and reworked the original a bit, including:
 • Support for 32-bit guests
 • 64-bit second support in wallclock
 • Time counters for runnable/blocked states in runstate support
 • Self-tests
 • Fixed Viridian coexistence
 • No new KVM_CAP_XEN_xxx, just more bits returned by KVM_CAP_XEN_HVM

I'm about to do the event channel support, but this part stands alone
and should be sufficient to get a fully functional Xen HVM guest running.

David Woodhouse (6):
      KVM: Fix arguments to kvm_{un,}map_gfn()
      KVM: x86/xen: Fix coexistence of Xen and Hyper-V hypercalls
      KVM: x86/xen: latch long_mode when hypercall page is set up
      KVM: x86/xen: add definitions of compat_shared_info, compat_vcpu_info
      xen: add wc_sec_hi to struct shared_info
      KVM: x86: declare Xen HVM shared info capability and add test case

Joao Martins (9):
      KVM: x86/xen: fix Xen hypercall page msr handling
      KVM: x86/xen: intercept xen hypercalls if enabled
      KVM: x86/xen: add KVM_XEN_HVM_SET_ATTR/KVM_XEN_HVM_GET_ATTR
      KVM: x86/xen: register shared_info page
      KVM: x86/xen: setup pvclock updates
      KVM: x86/xen: update wallclock region
      KVM: x86/xen: register vcpu info
      KVM: x86/xen: register vcpu time info region
      KVM: x86/xen: register runstate info

 arch/x86/include/asm/kvm_host.h                    |  23 +
 arch/x86/include/asm/xen/interface.h               |   3 +
 arch/x86/kvm/Makefile                              |   2 +-
 arch/x86/kvm/hyperv.c                              |  40 +-
 arch/x86/kvm/trace.h                               |  36 ++
 arch/x86/kvm/x86.c                                 | 109 +++--
 arch/x86/kvm/x86.h                                 |   1 +
 arch/x86/kvm/xen.c                                 | 544 +++++++++++++++++++++
 arch/x86/kvm/xen.h                                 |  83 ++++
 include/linux/kvm_host.h                           |  34 +-
 include/uapi/linux/kvm.h                           |  47 ++
 include/xen/interface/xen.h                        |   4 +-
 tools/testing/selftests/kvm/Makefile               |   2 +
 tools/testing/selftests/kvm/lib/kvm_util.c         |   1 +
 .../testing/selftests/kvm/x86_64/xen_shinfo_test.c | 187 +++++++
 .../testing/selftests/kvm/x86_64/xen_vmcall_test.c | 150 ++++++
 virt/kvm/kvm_main.c                                |   8 +-
 17 files changed, 1201 insertions(+), 73 deletions(-)

32-bit guests, and fleshed out the runstate information a little more
to add times for all of running, runnable, blocked states.