linux-kernel - [RFC PATCH 00/13] KVM: x86: SMM support

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Date:	Thu, 30 Apr 2015 13:35:59 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	rkrcmar@...hat.com, bsd@...hat.com, guangrong.xiao@...ux.intel.com,
	Yang Zhang <yang.z.zhang@...el.com>, wanpeng.li@...ux.intel.com
Subject: [RFC PATCH 00/13] KVM: x86: SMM support

This patch series introduces system management mode support.
There is still some work to do, namely: test without unrestricted
guest support, test on AMD, disable the capability if !unrestricted
guest and !emulate invalid guest state(*), test with a QEMU that
understand KVM_MEM_X86_SMRAM, actually post QEMU patches that let
you use this.

	(*) newer chipsets moved away from legacy SMRAM at 0xa0000,
	    thus support for real mode CS base above 1M is necessary

Because legacy SMRAM is a mess, I have tried these patches with Q35's
high SMRAM (at 0xfeda0000).  This means that right now this isn't
the easiest thing to test; you need QEMU patches that add support
for high SMRAM, and SeaBIOS patches to use high SMRAM.  Until QEMU
support for KVM_MEM_X86_SMRAM is in place, also, I'm keeping SMRAM
open in SeaBIOS.

That said, even this clumsy and incomplete userspace configuration is
enough to test all patches except 11 and 12.

The series is structured as follows.

Patch 1 is an unrelated bugfix (I think).  Patches 2 to 6 extend some
infrastructure functions.  Patches 1 to 4 could be committed right now.

Patches 7 to 9 implement basic support for SMM in the KVM API
and teach KVM about doing the world switch on SMI and RSM.

Patch 10 touches all places in KVM that read/write guest memory to
go through an x86-specific function.  The x86-specific function takes
a VCPU rather than a struct kvm.  This is used in patches 11 and 12
to limits access to specially marked SMRAM slots unless the VCPU is
in system management mode.

Finally, patch 13 exposes the new capability for userspace to probe.

Paolo

Paolo Bonzini (12):
  KVM: MMU: fix for CR4.SMEP=1, CR0.WP=0?
  KVM: export __gfn_to_pfn_memslot, drop gfn_to_pfn_async
  KVM: remove unnecessary arg from mark_page_dirty_in_slot, export it
  KVM: x86: pass host_initiated to functions that read MSRs
  KVM: x86: pass the whole hflags field to emulator and back
  KVM: x86: API changes for SMM support
  KVM: x86: stubs for SMM support
  KVM: x86: save/load state on SMM switch
  KVM: x86: add vcpu-specific functions to read/write/translate GFNs
  KVM: x86: add SMM to the MMU role
  KVM: x86: add KVM_MEM_X86_SMRAM memory slot flag
  KVM: x86: advertise KVM_CAP_X86_SMM

Radim Krčmář (1):
  KVM: reuse memslot in kvm_write_guest_page

 Documentation/virtual/kvm/api.txt  |  52 ++++-
 arch/x86/include/asm/kvm_emulate.h |   7 +-
 arch/x86/include/asm/kvm_host.h    |  39 ++--
 arch/x86/include/asm/vmx.h         |   1 +
 arch/x86/include/uapi/asm/kvm.h    |  10 +
 arch/x86/kvm/Makefile              |   2 +-
 arch/x86/kvm/cpuid.h               |   8 +
 arch/x86/kvm/emulate.c             | 257 ++++++++++++++++++++-
 arch/x86/kvm/kvm_cache_regs.h      |   5 +
 arch/x86/kvm/lapic.c               |  26 ++-
 arch/x86/kvm/mmu.c                 |  20 +-
 arch/x86/kvm/paging_tmpl.h         |   8 +-
 arch/x86/kvm/smram.c               | 229 +++++++++++++++++++
 arch/x86/kvm/svm.c                 |  63 +++---
 arch/x86/kvm/vmx.c                 |  74 +++---
 arch/x86/kvm/x86.c                 | 452 ++++++++++++++++++++++++++++++-------
 include/linux/kvm_host.h           |  20 +-
 include/uapi/linux/kvm.h           |   5 +-
 virt/kvm/kvm_main.c                |  48 ++--
 19 files changed, 1095 insertions(+), 231 deletions(-)
 create mode 100644 arch/x86/kvm/smram.c

-- 
1.8.3.1

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