linux/Documentation/virtual, branch v4.11

Merge tag 'kvm-arm-for-v4.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm

2017-04-05T14:27:47Z

From: Christoffer Dall KVM/ARM Fixes for v4.11-rc6 Fixes include: - Fix a problem with GICv3 userspace save/restore - Clarify GICv2 userspace save/restore ABI - Be more careful in clearing GIC LRs - Add missing synchronization primitive to our MMU handling code

KVM: arm/arm64: vgic: Fix GICC_PMR uaccess on GICv3 and clarify ABI

2017-04-04T12:33:59Z

As an oversight, for GICv2, we accidentally export the GICC_PMR register in the format of the GICH_VMCR.VMPriMask field in the lower 5 bits of a word, meaning that userspace must always use the lower 5 bits to communicate with the KVM device and must shift the value left by 3 places to obtain the actual priority mask level. Since GICv3 supports the full 8 bits of priority masking in the ICH_VMCR, we have to fix the value we export when emulating a GICv2 on top of a hardware GICv3 and exporting the emulated GICv2 state to userspace. Take the chance to clarify this aspect of the ABI. Reviewed-by: Marc Zyngier Signed-off-by: Christoffer Dall

KVM: Documentation: document MCE ioctls

2017-03-20T15:25:06Z

Signed-off-by: Luiz Capitulino Reviewed-by: David Hildenbrand Signed-off-by: Radim Krčmář

KVM: Add documentation for KVM_CAP_NR_MEMSLOTS

2017-03-09T09:13:20Z

Add documentation for KVM_CAP_NR_MEMSLOTS capability. Reviewed-by: Christoffer Dall Signed-off-by: Linu Cherian Signed-off-by: Marc Zyngier

Merge tag 'docs-4.11-fixes' of git://git.lwn.net/linux

2017-03-04T19:32:18Z

Pull documentation fixes from Jonathan Corbet: "A few fixes for the docs tree, including one for a 4.11 build regression" * tag 'docs-4.11-fixes' of git://git.lwn.net/linux: Documentation/sphinx: fix primary_domain configuration docs: Fix htmldocs build failure doc/ko_KR/memory-barriers: Update control-dependencies section pcieaer doc: update the link Documentation: Update path to sysrq.txt

Documentation: Update path to sysrq.txt

2017-03-03T22:48:38Z

Commit 9d85025b0418 ("docs-rst: create an user's manual book") moved the sysrq.txt leaving old paths in the kernel docs. Signed-off-by: Krzysztof Kozlowski Reviewed-by: Mauro Carvalho Chehab Signed-off-by: Jonathan Corbet

KVM: race-free exit from KVM_RUN without POSIX signals

2017-02-17T11:27:37Z

The purpose of the KVM_SET_SIGNAL_MASK API is to let userspace "kick" a VCPU out of KVM_RUN through a POSIX signal. A signal is attached to a dummy signal handler; by blocking the signal outside KVM_RUN and unblocking it inside, this possible race is closed: VCPU thread service thread -------------------------------------------------------------- check flag set flag raise signal (signal handler does nothing) KVM_RUN However, one issue with KVM_SET_SIGNAL_MASK is that it has to take tsk->sighand->siglock on every KVM_RUN. This lock is often on a remote NUMA node, because it is on the node of a thread's creator. Taking this lock can be very expensive if there are many userspace exits (as is the case for SMP Windows VMs without Hyper-V reference time counter). As an alternative, we can put the flag directly in kvm_run so that KVM can see it: VCPU thread service thread -------------------------------------------------------------- raise signal signal handler set run->immediate_exit KVM_RUN check run->immediate_exit Reviewed-by: Radim Krčmář Reviewed-by: David Hildenbrand Signed-off-by: Paolo Bonzini

Merge tag 'kvmarm-for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2017-02-09T15:01:23Z

kvmarm updates for 4.11 - GICv3 save restore - Cache flushing fixes - MSI injection fix for GICv3 ITS - Physical timer emulation support

Merge tag 'kvm_mips_4.11_1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/kvm-mips into HEAD

2017-02-07T17:18:13Z

KVM: MIPS: GVA/GPA page tables, dirty logging, SYNC_MMU etc Numerous MIPS KVM fixes, improvements, and features for 4.11, many of which continue to pave the way for VZ support, the most interesting of which are: - Add GVA->HPA page tables for T&E, to cache GVA mappings. - Generate fast-path TLB refill exception handler which loads host TLB entries from GVA page table, avoiding repeated guest memory translation and guest TLB lookups. - Use uaccess macros when T&E needs to access guest memory, which with GVA page tables and the Linux TLB refill handler improves robustness against TLB faults and fixes EVA hosts. - Use BadInstr/BadInstrP registers when available to obtain instruction encodings after a synchronous trap. - Add GPA->HPA page tables to replace the inflexible linear array, allowing for multiple sparsely arranged memory regions. - Properly implement dirty page logging. - Add KVM_CAP_SYNC_MMU support so that changes in GPA mappings become effective in guests even if they are already running, allowing for copy-on-write, KSM, idle page tracking, swapping, and guest memory ballooning. - Add KVM_CAP_READONLY_MEM support, so writes to specified memory regions are treated as MMIO. - Implement proper CP0_EBase support in T&E. - Expose a few more missing CP0 registers to userland. - Add KVM_CAP_NR_VCPUS and KVM_CAP_MAX_VCPUS support, and allow up to 8 VCPUs to be created in a VM. - Various cleanups and dropping of dead and duplicated code.

Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD

2017-02-07T17:17:46Z

The big feature this time is support for POWER9 using the radix-tree MMU for host and guest. This required some changes to arch/powerpc code, so I talked with Michael Ellerman and he created a topic branch with this patchset, which I merged into kvm-ppc-next and which Michael will pull into his tree. Michael also put in some patches from Nick Piggin which fix bugs in the interrupt vector code in relocatable kernels when coming from a KVM guest. Other notable changes include: * Add the ability to change the size of the hashed page table, from David Gibson. * XICS (interrupt controller) emulation fixes and improvements, from Li Zhong. * Bug fixes from myself and Thomas Huth. These patches define some new KVM capabilities and ioctls, but there should be no conflicts with anything else currently upstream, as far as I am aware.