Re: [PATCH 00/12] KVM: PPC: Nested APIv2 : Performance improvements
On Fri, 01 Dec 2023 18:56:05 +0530, Vaibhav Jain wrote: > This patch series introduces series of performance improvements to recently > added support for Nested APIv2 PPC64 Guests via [1]. Details for Nested > APIv2 for PPC64 Guests is available in Documentation/powerpc/kvm-nested.rst. > > This patch series introduces various optimizations for a Nested APIv2 > guests namely: > > [...] Applied to powerpc/topic/ppc-kvm. [01/12] KVM: PPC: Book3S HV nestedv2: Invalidate RPT before deleting a guest https://git.kernel.org/powerpc/c/7d370e1812b9a5f5cc68aaa5991bf7d31d8ff52c [02/12] KVM: PPC: Book3S HV nestedv2: Avoid reloading the tb offset https://git.kernel.org/powerpc/c/e0d4acbcba3f2d63dc15bc5432c8e26fc9e19675 [03/12] KVM: PPC: Book3S HV nestedv2: Do not check msr on hcalls https://git.kernel.org/powerpc/c/63ccae78cd88b52fb1d598ae33fa8408ce067b30 [04/12] KVM: PPC: Book3S HV nestedv2: Get the PID only if needed to copy tofrom a guest https://git.kernel.org/powerpc/c/e678748a8dca5b57041a84a66577f6168587b3f7 [05/12] KVM: PPC: Book3S HV nestedv2: Ensure LPCR_MER bit is passed to the L0 https://git.kernel.org/powerpc/c/ec0f6639fa8853cf6bfdfc3588aada7eeb7e5e37 [06/12] KVM: PPC: Book3S HV: Handle pending exceptions on guest entry with MSR_EE https://git.kernel.org/powerpc/c/ecd10702baae5c16a91d139bde7eff84ce55daee [07/12] KVM: PPC: Book3S HV nestedv2: Do not inject certain interrupts https://git.kernel.org/powerpc/c/df938a5576f3f3b08e1f217c660385c0d58a0b91 [08/12] KVM: PPC: Book3S HV nestedv2: Avoid msr check in kvmppc_handle_exit_hv() https://git.kernel.org/powerpc/c/a9a3de530d7531bf6cd3f6ccda769cd94c1105a0 [09/12] KVM: PPC: Book3S HV nestedv2: Do not call H_COPY_TOFROM_GUEST https://git.kernel.org/powerpc/c/4bc8ff6f170c78f64446c5d5f9ef6771eefd3416 [10/12] KVM: PPC: Book3S HV nestedv2: Register the VPA with the L0 https://git.kernel.org/powerpc/c/db1dcfae1dae3c042f348175ac0394e2fc14b1b3 [11/12] KVM: PPC: Reduce reliance on analyse_instr() in mmio emulation https://git.kernel.org/powerpc/c/797a5af8fc7297b19e5c6b1713956ebf1e6c1cde [12/12] KVM: PPC: Book3S HV nestedv2: Do not cancel pending decrementer exception https://git.kernel.org/powerpc/c/180c6b072bf360b686e53d893d8dcf7dbbaec6bb cheers
[PATCH 00/12] KVM: PPC: Nested APIv2 : Performance improvements
From: vaibhav This patch series introduces series of performance improvements to recently added support for Nested APIv2 PPC64 Guests via [1]. Details for Nested APIv2 for PPC64 Guests is available in Documentation/powerpc/kvm-nested.rst. This patch series introduces various optimizations for a Nested APIv2 guests namely: * Reduce the number times L1 hypervisor requests for L2 state from L0. * Register the L2 VPA with L1 * Optimizing interrupt delivery of some interrupt types. * Optimize emulation of mmio loads/stores for L2 in L1. The hcalls needed for testing these patches have been implemented in the spapr qemu model and is available at [2]. There are scripts available to assist in setting up an environment for testing nested guests at [3]. These patches are consequence of insights from on going performance engineering effort for improving performance of Nested APIv2 Guests. Special thanks goes to: * Gautam Menghani * Jordan Niethe * Nicholas Piggin * Vaidyanathan Srinivasan Refs: [1] https://lore.kernel.org/all/20230905034658.82835-1-jniet...@gmail.com [2] https://github.com/planetharsh/qemu/tree/upstream-0714-kop [3] https://github.com/iamjpn/kvm-powervm-test Jordan Niethe (11): KVM: PPC: Book3S HV nestedv2: Invalidate RPT before deleting a guest KVM: PPC: Book3S HV nestedv2: Avoid reloading the tb offset KVM: PPC: Book3S HV nestedv2: Do not check msr on hcalls KVM: PPC: Book3S HV nestedv2: Get the PID only if needed to copy tofrom a guest KVM: PPC: Book3S HV nestedv2: Ensure LPCR_MER bit is passed to the L0 KVM: PPC: Book3S HV nestedv2: Do not inject certain interrupts KVM: PPC: Book3S HV nestedv2: Avoid msr check in kvmppc_handle_exit_hv() KVM: PPC: Book3S HV nestedv2: Do not call H_COPY_TOFROM_GUEST KVM: PPC: Book3S HV nestedv2: Register the VPA with the L0 KVM: PPC: Reduce reliance on analyse_instr() in mmio emulation KVM: PPC: Book3S HV nestedv2: Do not cancel pending decrementer exception Nicholas Piggin (1): KVM: PPC: Book3S HV: Handle pending exceptions on guest entry with MSR_EE arch/powerpc/include/asm/kvm_book3s.h| 10 +++- arch/powerpc/include/asm/kvm_book3s_64.h | 1 + arch/powerpc/kvm/book3s.c| 4 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 7 ++- arch/powerpc/kvm/book3s_hv.c | 72 +--- arch/powerpc/kvm/book3s_hv_nested.c | 2 +- arch/powerpc/kvm/book3s_hv_nestedv2.c| 29 ++ arch/powerpc/kvm/emulate_loadstore.c | 21 --- 8 files changed, 107 insertions(+), 39 deletions(-) -- 2.42.0
