kernel/linux.git/include/uapi/linux/kvm.h, branch v6.1.168

KVM: Add KVM_CAP_DIRTY_LOG_RING_ACQ_REL capability and config option

2022-09-29T09:23:08+00:00

In order to differenciate between architectures that require no extra synchronisation when accessing the dirty ring and those who do, add a new capability (KVM_CAP_DIRTY_LOG_RING_ACQ_REL) that identify the latter sort. TSO architectures can obviously advertise both, while relaxed architectures must only advertise the ACQ_REL version. This requires some configuration symbol rejigging, with HAVE_KVM_DIRTY_RING being only indirectly selected by two top-level config symbols: - HAVE_KVM_DIRTY_RING_TSO for strongly ordered architectures (x86) - HAVE_KVM_DIRTY_RING_ACQ_REL for weakly ordered architectures (arm64) Suggested-by: Paolo Bonzini Signed-off-by: Marc Zyngier Reviewed-by: Gavin Shan Reviewed-by: Peter Xu Link: https://lore.kernel.org/r/20220926145120.27974-3-maz@kernel.org

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2022-08-04T21:59:54+00:00

Pull kvm updates from Paolo Bonzini: "Quite a large pull request due to a selftest API overhaul and some patches that had come in too late for 5.19. ARM: - Unwinder implementations for both nVHE modes (classic and protected), complete with an overflow stack - Rework of the sysreg access from userspace, with a complete rewrite of the vgic-v3 view to allign with the rest of the infrastructure - Disagregation of the vcpu flags in separate sets to better track their use model. - A fix for the GICv2-on-v3 selftest - A small set of cosmetic fixes RISC-V: - Track ISA extensions used by Guest using bitmap - Added system instruction emulation framework - Added CSR emulation framework - Added gfp_custom flag in struct kvm_mmu_memory_cache - Added G-stage ioremap() and iounmap() functions - Added support for Svpbmt inside Guest s390: - add an interface to provide a hypervisor dump for secure guests - improve selftests to use TAP interface - enable interpretive execution of zPCI instructions (for PCI passthrough) - First part of deferred teardown - CPU Topology - PV attestation - Minor fixes x86: - Permit guests to ignore single-bit ECC errors - Intel IPI virtualization - Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS - PEBS virtualization - Simplify PMU emulation by just using PERF_TYPE_RAW events - More accurate event reinjection on SVM (avoid retrying instructions) - Allow getting/setting the state of the speaker port data bit - Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls are inconsistent - "Notify" VM exit (detect microarchitectural hangs) for Intel - Use try_cmpxchg64 instead of cmpxchg64 - Ignore benign host accesses to PMU MSRs when PMU is disabled - Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior - Allow NX huge page mitigation to be disabled on a per-vm basis - Port eager page splitting to shadow MMU as well - Enable CMCI capability by default and handle injected UCNA errors - Expose pid of vcpu threads in debugfs - x2AVIC support for AMD - cleanup PIO emulation - Fixes for LLDT/LTR emulation - Don't require refcounted "struct page" to create huge SPTEs - Miscellaneous cleanups: - MCE MSR emulation - Use separate namespaces for guest PTEs and shadow PTEs bitmasks - PIO emulation - Reorganize rmap API, mostly around rmap destruction - Do not workaround very old KVM bugs for L0 that runs with nesting enabled - new selftests API for CPUID Generic: - Fix races in gfn->pfn cache refresh; do not pin pages tracked by the cache - new selftests API using struct kvm_vcpu instead of a (vm, id) tuple" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (606 commits) selftests: kvm: set rax before vmcall selftests: KVM: Add exponent check for boolean stats selftests: KVM: Provide descriptive assertions in kvm_binary_stats_test selftests: KVM: Check stat name before other fields KVM: x86/mmu: remove unused variable RISC-V: KVM: Add support for Svpbmt inside Guest/VM RISC-V: KVM: Use PAGE_KERNEL_IO in kvm_riscv_gstage_ioremap() RISC-V: KVM: Add G-stage ioremap() and iounmap() functions KVM: Add gfp_custom flag in struct kvm_mmu_memory_cache RISC-V: KVM: Add extensible CSR emulation framework RISC-V: KVM: Add extensible system instruction emulation framework RISC-V: KVM: Factor-out instruction emulation into separate sources RISC-V: KVM: move preempt_disable() call in kvm_arch_vcpu_ioctl_run RISC-V: KVM: Make kvm_riscv_guest_timer_init a void function RISC-V: KVM: Fix variable spelling mistake RISC-V: KVM: Improve ISA extension by using a bitmap KVM, x86/mmu: Fix the comment around kvm_tdp_mmu_zap_leafs() KVM: SVM: Dump Virtual Machine Save Area (VMSA) to klog KVM: x86/mmu: Treat NX as a valid SPTE bit for NPT KVM: x86: Do not block APIC write for non ICR registers ...

Merge tag 'flexible-array-transformations-UAPI-6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

2022-08-03T02:50:47+00:00

Pull uapi flexible array update from Gustavo Silva: "A treewide patch that replaces zero-length arrays with flexible-array members in UAPI. This has been baking in linux-next for 5 weeks now. '-fstrict-flex-arrays=3' is coming and we need to land these changes to prevent issues like these in the short future: fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0, but the source string has length 2 (including NUL byte) [-Wfortify-source] strcpy(de3->name, "."); ^ Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If this breaks anything, we can use a union with a new member name" Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836 * tag 'flexible-array-transformations-UAPI-6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: treewide: uapi: Replace zero-length arrays with flexible-array members

Merge remote-tracking branch 'kvm/next' into kvm-next-5.20

2022-08-01T07:21:00+00:00

KVM/s390, KVM/x86 and common infrastructure changes for 5.20 x86: * Permit guests to ignore single-bit ECC errors * Fix races in gfn->pfn cache refresh; do not pin pages tracked by the cache * Intel IPI virtualization * Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS * PEBS virtualization * Simplify PMU emulation by just using PERF_TYPE_RAW events * More accurate event reinjection on SVM (avoid retrying instructions) * Allow getting/setting the state of the speaker port data bit * Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls are inconsistent * "Notify" VM exit (detect microarchitectural hangs) for Intel * Cleanups for MCE MSR emulation s390: * add an interface to provide a hypervisor dump for secure guests * improve selftests to use TAP interface * enable interpretive execution of zPCI instructions (for PCI passthrough) * First part of deferred teardown * CPU Topology * PV attestation * Minor fixes Generic: * new selftests API using struct kvm_vcpu instead of a (vm, id) tuple x86: * Use try_cmpxchg64 instead of cmpxchg64 * Bugfixes * Ignore benign host accesses to PMU MSRs when PMU is disabled * Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior * x86/MMU: Allow NX huge pages to be disabled on a per-vm basis * Port eager page splitting to shadow MMU as well * Enable CMCI capability by default and handle injected UCNA errors * Expose pid of vcpu threads in debugfs * x2AVIC support for AMD * cleanup PIO emulation * Fixes for LLDT/LTR emulation * Don't require refcounted "struct page" to create huge SPTEs x86 cleanups: * Use separate namespaces for guest PTEs and shadow PTEs bitmasks * PIO emulation * Reorganize rmap API, mostly around rmap destruction * Do not workaround very old KVM bugs for L0 that runs with nesting enabled * new selftests API for CPUID

RISC-V: KVM: Add extensible CSR emulation framework

2022-07-29T11:44:53+00:00

We add an extensible CSR emulation framework which is based upon the existing system instruction emulation. This will be useful to upcoming AIA, PMU, Nested and other virtualization features. The CSR emulation framework also has provision to emulate CSR in user space but this will be used only in very specific cases such as AIA IMSIC CSR emulation in user space or vendor specific CSR emulation in user space. By default, all CSRs not handled by KVM RISC-V will be redirected back to Guest VCPU as illegal instruction trap. Signed-off-by: Anup Patel Signed-off-by: Anup Patel

KVM: s390: resetting the Topology-Change-Report

2022-07-20T08:57:37+00:00

During a subsystem reset the Topology-Change-Report is cleared. Let's give userland the possibility to clear the MTCR in the case of a subsystem reset. To migrate the MTCR, we give userland the possibility to query the MTCR state. We indicate KVM support for the CPU topology facility with a new KVM capability: KVM_CAP_S390_CPU_TOPOLOGY. Signed-off-by: Pierre Morel Reviewed-by: Janis Schoetterl-Glausch Reviewed-by: Janosch Frank Message-Id: <20220714194334.127812-1-pmorel@linux.ibm.com> Link: https://lore.kernel.org/all/20220714194334.127812-1-pmorel@linux.ibm.com/ [frankja@linux.ibm.com: Simple conflict resolution in Documentation/virt/kvm/api.rst] Signed-off-by: Janosch Frank

KVM: stats: Fix value for KVM_STATS_UNIT_MAX for boolean stats

2022-07-19T12:54:11+00:00

commit 1b870fa5573e ("kvm: stats: tell userspace which values are boolean") added a new stat unit (boolean) but failed to raise KVM_STATS_UNIT_MAX. Fix by pointing UNIT_MAX at the new max value of UNIT_BOOLEAN. Fixes: 1b870fa5573e ("kvm: stats: tell userspace which values are boolean") Reported-by: Janis Schoetterl-Glausch Signed-off-by: Oliver Upton Message-Id: <20220719125229.2934273-1-oupton@google.com> Signed-off-by: Paolo Bonzini

kvm: stats: tell userspace which values are boolean

2022-07-14T12:01:59+00:00

Some of the statistics values exported by KVM are always only 0 or 1. It can be useful to export this fact to userspace so that it can track them specially (for example by polling the value every now and then to compute a % of time spent in a specific state). Therefore, add "boolean value" as a new "unit". While it is not exactly a unit, it walks and quacks like one. In particular, using the type would be wrong because boolean values could be instantaneous or peak values (e.g. "is the rmap allocated?") or even two-bucket histograms (e.g. "number of posted vs. non-posted interrupt injections"). Suggested-by: Amneesh Singh Signed-off-by: Paolo Bonzini

Merge tag 'kvm-s390-pci-5.20' into kernelorgnext

2022-07-11T09:28:57+00:00

KVM: s390/pci: enable zPCI for interpretive execution Add the necessary code in s390 base, pci and KVM to enable interpretion of PCI pasthru.

KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices

2022-07-11T07:54:38+00:00

The KVM_S390_ZPCI_OP ioctl provides a mechanism for managing hardware-assisted virtualization features for s390x zPCI passthrough. Add the first 2 operations, which can be used to enable/disable the specified device for Adapter Event Notification interpretation. Signed-off-by: Matthew Rosato Acked-by: Pierre Morel Reviewed-by: Thomas Huth Link: https://lore.kernel.org/r/20220606203325.110625-21-mjrosato@linux.ibm.com Signed-off-by: Christian Borntraeger