[PATCH v3 00/13] KVM/X86: Introduce a new guest mapping interface

KarimAllah Ahmed
2018-10-20T22:22:12Z

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.

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.

v3 -> v2:

- rebase
- Add a new patch to also fix the newly introducing shadow VMCS support for
nested.

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: handle_vmptrld: Copy the VMCS12 directly from guest memory
X86/nVMX: Update the PML table without mapping and unmapping the page
KVM: Introduce a new guest mapping API
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/X86: hyperv: Use kvm_vcpu_map in synic_clear_sint_msg_pending
KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver_msg
KVM/nSVM: Use the new mapping API for mapping guest memory
KVM/nVMX: Use kvm_vcpu_map for accessing the shadow VMCS

arch/x86/kvm/hyperv.c | 28 ++++----
arch/x86/kvm/paging_tmpl.h | 38 ++++++++---
arch/x86/kvm/svm.c | 97 +++++++++++++-------------
arch/x86/kvm/vmx.c | 167 +++++++++++++++++----------------------------
arch/x86/kvm/x86.c | 13 ++--
include/linux/kvm_host.h | 9 +++
virt/kvm/kvm_main.c | 50 ++++++++++++++
7 files changed, 217 insertions(+), 185 deletions(-)

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2.7.4