Messages in this thread | | | From | KarimAllah Ahmed <> | Subject | [PATCH v5 00/13] KVM/X86: Introduce a new guest mapping interface | Date | Wed, 9 Jan 2019 10:42:00 +0100 |
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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
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