linux/arch/x86/kvm
Dan Williams ba049e93ae kvm: rename pfn_t to kvm_pfn_t
To date, we have implemented two I/O usage models for persistent memory,
PMEM (a persistent "ram disk") and DAX (mmap persistent memory into
userspace).  This series adds a third, DAX-GUP, that allows DAX mappings
to be the target of direct-i/o.  It allows userspace to coordinate
DMA/RDMA from/to persistent memory.

The implementation leverages the ZONE_DEVICE mm-zone that went into
4.3-rc1 (also discussed at kernel summit) to flag pages that are owned
and dynamically mapped by a device driver.  The pmem driver, after
mapping a persistent memory range into the system memmap via
devm_memremap_pages(), arranges for DAX to distinguish pfn-only versus
page-backed pmem-pfns via flags in the new pfn_t type.

The DAX code, upon seeing a PFN_DEV+PFN_MAP flagged pfn, flags the
resulting pte(s) inserted into the process page tables with a new
_PAGE_DEVMAP flag.  Later, when get_user_pages() is walking ptes it keys
off _PAGE_DEVMAP to pin the device hosting the page range active.
Finally, get_page() and put_page() are modified to take references
against the device driver established page mapping.

Finally, this need for "struct page" for persistent memory requires
memory capacity to store the memmap array.  Given the memmap array for a
large pool of persistent may exhaust available DRAM introduce a
mechanism to allocate the memmap from persistent memory.  The new
"struct vmem_altmap *" parameter to devm_memremap_pages() enables
arch_add_memory() to use reserved pmem capacity rather than the page
allocator.

This patch (of 18):

The core has developed a need for a "pfn_t" type [1].  Move the existing
pfn_t in KVM to kvm_pfn_t [2].

[1]: https://lists.01.org/pipermail/linux-nvdimm/2015-September/002199.html
[2]: https://lists.01.org/pipermail/linux-nvdimm/2015-September/002218.html

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-15 17:56:32 -08:00
..
assigned-dev.c KVM: x86: move kvm_set_irq_inatomic to legacy device assignment 2015-11-04 16:24:36 +01:00
assigned-dev.h
cpuid.c s390: A bunch of fixes and optimizations for interrupt and time 2015-11-05 16:26:26 -08:00
cpuid.h Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-01-11 16:46:20 -08:00
emulate.c KVM: x86: allow RSM from 64-bit mode 2015-11-04 16:24:38 +01:00
hyperv.c kvm/x86: Hyper-V SynIC timers tracepoints 2016-01-08 19:04:43 +01:00
hyperv.h kvm/x86: Hyper-V SynIC timers 2015-12-16 18:49:45 +01:00
i8254.c kvm: x86: only channel 0 of the i8254 is linked to the HPET 2016-01-07 13:50:38 +01:00
i8254.h
i8259.c KVM: x86: clean/fix memory barriers in irqchip_in_kernel 2015-07-30 16:02:56 +02:00
ioapic.c kvm/x86: split ioapic-handled and EOI exit bitmaps 2015-11-25 17:24:21 +01:00
ioapic.h kvm/x86: split ioapic-handled and EOI exit bitmaps 2015-11-25 17:24:21 +01:00
iommu.c kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
irq_comm.c kvm/x86: Hyper-V synthetic interrupt controller 2015-11-25 17:24:22 +01:00
irq.c kvm/x86: per-vcpu apicv deactivation support 2015-11-25 17:24:21 +01:00
irq.h KVM: x86: Add support for local interrupt requests from userspace 2015-10-01 15:06:29 +02:00
Kconfig KVM: x86: select IRQ_BYPASS_MANAGER 2015-10-01 15:06:52 +02:00
kvm_cache_regs.h
lapic.c kvm/x86: Hyper-V synthetic interrupt controller 2015-11-25 17:24:22 +01:00
lapic.h kvm/x86: Hyper-V synthetic interrupt controller 2015-11-25 17:24:22 +01:00
Makefile kvm/x86: move Hyper-V MSR's/hypercall code into hyperv.c file 2015-07-23 08:27:06 +02:00
mmu_audit.c kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
mmu.c kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
mmu.h KVM: x86: merge handle_mmio_page_fault and handle_mmio_page_fault_common 2015-11-10 12:06:03 +01:00
mmutrace.h
mtrr.c KVM: MTRR: treat memory as writeback if MTRR is disabled in guest CPUID 2015-12-22 15:29:00 +01:00
paging_tmpl.h kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
pmu_amd.c KVM: x86/vPMU: Fix unnecessary signed extension for AMD PERFCTRn 2015-08-11 15:19:41 +02:00
pmu_intel.c
pmu.c
pmu.h
svm.c * s390: Support for runtime instrumentation within guests, 2016-01-12 13:22:12 -08:00
trace.h kvm/x86: Hyper-V SynIC timers tracepoints 2016-01-08 19:04:43 +01:00
tss.h
vmx.c kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
x86.c kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
x86.h x86/fpu: Rename XSAVE macros 2015-09-14 12:21:46 +02:00