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2021-03-06x86/mm/tlb: Flush remote and local TLBs concurrentlyNadav Amit1-1/+1
To improve TLB shootdown performance, flush the remote and local TLBs concurrently. Introduce flush_tlb_multi() that does so. Introduce paravirtual versions of flush_tlb_multi() for KVM, Xen and hyper-v (Xen and hyper-v are only compile-tested). While the updated smp infrastructure is capable of running a function on a single local core, it is not optimized for this case. The multiple function calls and the indirect branch introduce some overhead, and might make local TLB flushes slower than they were before the recent changes. Before calling the SMP infrastructure, check if only a local TLB flush is needed to restore the lost performance in this common case. This requires to check mm_cpumask() one more time, but unless this mask is updated very frequently, this should impact performance negatively. Signed-off-by: Nadav Amit <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Reviewed-by: Michael Kelley <[email protected]> # Hyper-v parts Reviewed-by: Juergen Gross <[email protected]> # Xen and paravirt parts Reviewed-by: Dave Hansen <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2019-11-12x86/hyperv: Micro-optimize send_ipi_one()Vitaly Kuznetsov1-0/+15
When sending an IPI to a single CPU there is no need to deal with cpumasks. With 2 CPU guest on WS2019 a minor (like 3%, 8043 -> 7761 CPU cycles) improvement with smp_call_function_single() loop benchmark can be seeb. The optimization, however, is tiny and straitforward. Also, send_ipi_one() is important for PV spinlock kick. Switching to the regular APIC IPI send for CPU > 64 case does not make sense as it is twice as expesive (12650 CPU cycles for __send_ipi_mask_ex() call, 26000 for orig_apic.send_IPI(cpu, vector)). Signed-off-by: Vitaly Kuznetsov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Michael Kelley <[email protected]> Reviewed-by: Roman Kagan <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
2018-12-21x86/hyper-v: Add HvFlushGuestAddressList hypercall supportLan Tianyu1-0/+14
Hyper-V provides HvFlushGuestAddressList() hypercall to flush EPT tlb with specified ranges. This patch is to add the hypercall support. Reviewed-by: Michael Kelley <[email protected]> Signed-off-by: Lan Tianyu <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2018-08-19Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds1-0/+14
Pull first set of KVM updates from Paolo Bonzini: "PPC: - minor code cleanups x86: - PCID emulation and CR3 caching for shadow page tables - nested VMX live migration - nested VMCS shadowing - optimized IPI hypercall - some optimizations ARM will come next week" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (85 commits) kvm: x86: Set highest physical address bits in non-present/reserved SPTEs KVM/x86: Use CC_SET()/CC_OUT in arch/x86/kvm/vmx.c KVM: X86: Implement PV IPIs in linux guest KVM: X86: Add kvm hypervisor init time platform setup callback KVM: X86: Implement "send IPI" hypercall KVM/x86: Move X86_CR4_OSXSAVE check into kvm_valid_sregs() KVM: x86: Skip pae_root shadow allocation if tdp enabled KVM/MMU: Combine flushing remote tlb in mmu_set_spte() KVM: vmx: skip VMWRITE of HOST_{FS,GS}_BASE when possible KVM: vmx: skip VMWRITE of HOST_{FS,GS}_SEL when possible KVM: vmx: always initialize HOST_{FS,GS}_BASE to zero during setup KVM: vmx: move struct host_state usage to struct loaded_vmcs KVM: vmx: compute need to reload FS/GS/LDT on demand KVM: nVMX: remove a misleading comment regarding vmcs02 fields KVM: vmx: rename __vmx_load_host_state() and vmx_save_host_state() KVM: vmx: add dedicated utility to access guest's kernel_gs_base KVM: vmx: track host_state.loaded using a loaded_vmcs pointer KVM: vmx: refactor segmentation code in vmx_save_host_state() kvm: nVMX: Fix fault priority for VMX operations kvm: nVMX: Fix fault vector for VMX operation at CPL > 0 ...
2018-08-06X86/Hyper-V: Add hyperv_nested_flush_guest_mapping ftrace supportTianyu Lan1-0/+14
This patch is to add hyperv_nested_flush_guest_mapping support to trace hvFlushGuestPhysicalAddressSpace hypercall. Signed-off-by: Lan Tianyu <[email protected]> Acked-by: K. Y. Srinivasan <[email protected]> Signed-off-by: Paolo Bonzini <[email protected]>
2018-07-03x86/hyper-v: Trace PV IPI sendVitaly Kuznetsov1-0/+15
Trace Hyper-V PV IPIs the same way we do PV TLB flush. Signed-off-by: Vitaly Kuznetsov <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: "K. Y. Srinivasan" <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Stephen Hemminger <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: Tianyu Lan <[email protected]> Cc: "Michael Kelley (EOSG)" <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
2017-08-31tracing/hyper-v: Trace hyperv_mmu_flush_tlb_others()Vitaly Kuznetsov1-0/+40
Add Hyper-V tracing subsystem and trace hyperv_mmu_flush_tlb_others(). Tracing is done the same way we do xen_mmu_flush_tlb_others(). Signed-off-by: Vitaly Kuznetsov <[email protected]> Reviewed-by: Andy Shevchenko <[email protected]> Reviewed-by: Stephen Hemminger <[email protected]> Reviewed-by: Steven Rostedt (VMware) <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Jork Loeser <[email protected]> Cc: K. Y. Srinivasan <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Simon Xiao <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>