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 function to map guest memory into host kernel memory. Ideally I should also get rid of all guest mapping functions that end up converting a guest address to a page, but I decided to get feedback on this first and see if this is an acceptable API. Most of the offending code paths that has been updated are in the nested code base. Mostly because I stumbled upon this code while looking at the nested MSR bitmap handling for the IBRS patches. There are also offending code paths in SVM code, but I will do that once the interface is accepted. KarimAllah Ahmed (12): KVM: Introduce helper functions to map/unmap guest memory KVM/VMX: Use the new host mapping API for apic_access_page KVM/VMX: Use the new host mapping API for virtual_apic_page KVM/VMX: Use the new host mapping API for pi_desc_page KVM/VMX: Use the new host mapping API for mapping nested vmptr KVM/VMX: Use the new host mapping API for handle_vmptrld KVM/VMX: Use the new host mapping API for mapping L12 MSR bitmap KVM/VMX: Use the new host mapping API for mapping nested PML KVM/VMX: Use the new host mapping API for cmpxchg_emulated KVM/VMX: Use the new host mapping API for synic_clear_sint_msg_pending KVM/VMX: Use the new host mapping API for synic_deliver_msg KVM/VMX: Remove kvm_vcpu_gpa_to_page as it is now unused arch/x86/kvm/hyperv.c | 24 +++---- arch/x86/kvm/vmx.c | 159 ++++++++++++++++++++--------------------------- arch/x86/kvm/x86.c | 12 ++-- include/linux/kvm_host.h | 18 +++++- virt/kvm/kvm_main.c | 62 ++++++++++++++++++ 5 files changed, 161 insertions(+), 114 deletions(-) Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> Cc: kvm@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx -- 2.7.4
