linux-kernel - [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface

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Message-Id: <1547026933-31226-1-git-send-email-karahmed@amazon.de>
Date:   Wed,  9 Jan 2019 10:42:00 +0100
From:   KarimAllah Ahmed <karahmed@...zon.de>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com
Cc:     KarimAllah Ahmed <karahmed@...zon.de>
Subject: [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface

Guest memory can either be directly managed by the kernel (i.e. have a "struct
page") or they can simply live outside kernel control (i.e. do not have a
"struct page"). KVM mostly support these two modes, except in a few places
where the code seems to assume that guest memory must have a "struct page".

This patchset introduces a new mapping interface to map guest memory into host
kernel memory which also supports PFN-based memory (i.e. memory without 'struct
page'). It also converts all offending code to this interface or simply
read/write directly from guest memory. Patch 2 is additionally fixing an
incorrect page release and marking the page as dirty (i.e. as a side-effect of
using the helper function to write).

As far as I can see all offending code is now fixed except the APIC-access page
which I will handle in a seperate series along with dropping
kvm_vcpu_gfn_to_page and kvm_vcpu_gpa_to_page from the internal KVM API.

The current implementation of the new API uses memremap to map memory that does
not have a "struct page". This proves to be very slow for high frequency
mappings. Since this does not affect the normal use-case where a "struct page"
is available, the performance of this API will be handled by a seperate patch
series.

v4 -> v5:
- Introduce a new parameter 'dirty' into kvm_vcpu_unmap
- A horrible rebase due to nested.c :)
- Dropped a couple of hyperv patches as the code was fixed already as a
  side-effect of another patch.
- Added a new trivial cleanup patch.

v3 -> v4:
- Rebase
- Add a new patch to also fix the newly introduced enlightned VMCS.

v2 -> v3:
- Rebase
- Add a new patch to also fix the newly introduced shadow VMCS.

Filippo Sironi (1):
  X86/KVM: Handle PFNs outside of kernel reach when touching GPTEs

KarimAllah Ahmed (12):
  X86/nVMX: handle_vmon: Read 4 bytes from guest memory
  X86/nVMX: Update the PML table without mapping and unmapping the page
  KVM: Introduce a new guest mapping API
  X86/nVMX: handle_vmptrld: Use kvm_vcpu_map when copying VMCS12 from
    guest memory
  KVM/nVMX: Use kvm_vcpu_map when mapping the L1 MSR bitmap
  KVM/nVMX: Use kvm_vcpu_map when mapping the virtual APIC page
  KVM/nVMX: Use kvm_vcpu_map when mapping the posted interrupt
    descriptor table
  KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated
  KVM/nSVM: Use the new mapping API for mapping guest memory
  KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS
  KVM/nVMX: Use kvm_vcpu_map for accessing the enlightened VMCS
  KVM/nVMX: Use page_address_valid in a few more locations

 arch/x86/kvm/paging_tmpl.h |  38 ++++++++---
 arch/x86/kvm/svm.c         |  97 +++++++++++++--------------
 arch/x86/kvm/vmx/nested.c  | 160 ++++++++++++++++-----------------------------
 arch/x86/kvm/vmx/vmx.c     |  19 ++----
 arch/x86/kvm/vmx/vmx.h     |   9 ++-
 arch/x86/kvm/x86.c         |  13 ++--
 include/linux/kvm_host.h   |   9 +++
 virt/kvm/kvm_main.c        |  53 +++++++++++++++
 8 files changed, 217 insertions(+), 181 deletions(-)

-- 
2.7.4