Upfront: This series contains a "pretty small" common code memory management change that will allow paging, guest backing with files etc almost just like normal VMs. It should be a no-op for all architectures not opting in. And it should be usable for others that also try to get notified on "the pages are in the process of being used for things like I/O" I CCed linux-mm (and Andrew as mm maintainer and Andrea as he was involved in some design discussions) on the first patch (common code mm). I also added the CC to some other patches that make use of this infrastructure or are dealing with arch-specific memory management. The full patch queue is on the linux-s390 and kvm mailing list. It would be good to get an ACK for this patch. I can then carry that via the s390 tree. Overview -------- Protected VMs (PVM) are KVM VMs, where KVM can't access the VM's state like guest memory and guest registers anymore. Instead the PVMs are mostly managed by a new entity called Ultravisor (UV), which provides an API, so KVM and the PV can request management actions. PVMs are encrypted at rest and protected from hypervisor access while running. They switch from a normal operation into protected mode, so we can still use the standard boot process to load a encrypted blob and then move it into protected mode. Rebooting is only possible by passing through the unprotected/normal mode and switching to protected again. All patches are in the protvirtv3 branch of the korg s390 kvm git https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git/log/?h=protvirtv3 Claudio presented the technology at his presentation at KVM Forum 2019. https://static.sched.com/hosted_files/kvmforum2019/3b/ibm_protected_vms_s390x.pdf RFCv2 -> v1 (you can diff the protvirtv2 and the protvirtv3 branch) - tons of review feedback integrated (see mail thread) - memory management now complete and working - Documentation patches merged - interrupt patches merged - CONFIG_KVM_S390_PROTECTED_VIRTUALIZATION_HOST removed - SIDA interface integrated into memop - for merged patches I removed reviews that were not in all patches Christian Borntraeger (3): KVM: s390/mm: Make pages accessible before destroying the guest KVM: s390: protvirt: Add SCLP interrupt handling KVM: s390: protvirt: do not inject interrupts after start Claudio Imbrenda (3): mm:gup/writeback: add callbacks for inaccessible pages s390/mm: provide memory management functions for protected KVM guests KVM: s390/mm: handle guest unpin events Janosch Frank (23): KVM: s390: add new variants of UV CALL KVM: s390: protvirt: Add initial lifecycle handling KVM: s390: protvirt: Add KVM api documentation KVM: s390: protvirt: Secure memory is not mergeable KVM: s390: protvirt: Handle SE notification interceptions KVM: s390: protvirt: Instruction emulation KVM: s390: protvirt: Handle spec exception loops KVM: s390: protvirt: Add new gprs location handling KVM: S390: protvirt: Introduce instruction data area bounce buffer KVM: s390: protvirt: handle secure guest prefix pages KVM: s390: protvirt: Write sthyi data to instruction data area KVM: s390: protvirt: STSI handling KVM: s390: protvirt: disallow one_reg KVM: s390: protvirt: Only sync fmt4 registers KVM: s390: protvirt: Add program exception injection KVM: s390: protvirt: Add diag 308 subcode 8 - 10 handling KVM: s390: protvirt: UV calls diag308 0, 1 KVM: s390: protvirt: Report CPU state to Ultravisor KVM: s390: protvirt: Support cmd 5 operation state KVM: s390: protvirt: Add UV debug trace KVM: s390: protvirt: Mask PSW interrupt bits for interception 104 and 112 KVM: s390: protvirt: Add UV cpu reset calls DOCUMENTATION: Protected virtual machine introduction and IPL Michael Mueller (2): KVM: s390: protvirt: Add interruption injection controls KVM: s390: protvirt: Implement interruption injection Ulrich Weigand (1): KVM: s390/interrupt: do not pin adapter interrupt pages Vasily Gorbik (3): s390/protvirt: introduce host side setup s390/protvirt: add ultravisor initialization s390/mm: add (non)secure page access exceptions handlers .../admin-guide/kernel-parameters.txt | 5 + Documentation/virt/kvm/api.txt | 67 ++- Documentation/virt/kvm/index.rst | 2 + Documentation/virt/kvm/s390-pv-boot.rst | 79 +++ Documentation/virt/kvm/s390-pv.rst | 116 +++++ MAINTAINERS | 1 + arch/s390/boot/Makefile | 2 +- arch/s390/boot/uv.c | 21 +- arch/s390/include/asm/gmap.h | 3 + arch/s390/include/asm/kvm_host.h | 114 ++++- arch/s390/include/asm/mmu.h | 2 + arch/s390/include/asm/mmu_context.h | 1 + arch/s390/include/asm/page.h | 5 + arch/s390/include/asm/pgtable.h | 35 +- arch/s390/include/asm/uv.h | 267 +++++++++- arch/s390/kernel/Makefile | 1 + arch/s390/kernel/pgm_check.S | 4 +- arch/s390/kernel/setup.c | 7 +- arch/s390/kernel/uv.c | 274 ++++++++++ arch/s390/kvm/Makefile | 2 +- arch/s390/kvm/diag.c | 1 + arch/s390/kvm/intercept.c | 109 +++- arch/s390/kvm/interrupt.c | 371 +++++++++++--- arch/s390/kvm/kvm-s390.c | 477 ++++++++++++++++-- arch/s390/kvm/kvm-s390.h | 39 ++ arch/s390/kvm/priv.c | 11 +- arch/s390/kvm/pv.c | 292 +++++++++++ arch/s390/mm/fault.c | 86 ++++ arch/s390/mm/gmap.c | 65 ++- include/linux/gfp.h | 6 + include/uapi/linux/kvm.h | 42 +- mm/gup.c | 2 + mm/page-writeback.c | 1 + 33 files changed, 2325 insertions(+), 185 deletions(-) create mode 100644 Documentation/virt/kvm/s390-pv-boot.rst create mode 100644 Documentation/virt/kvm/s390-pv.rst create mode 100644 arch/s390/kernel/uv.c create mode 100644 arch/s390/kvm/pv.c -- 2.24.0
