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Message-ID: <20130609073115.GE4725@redhat.com> Date: Sun, 9 Jun 2013 10:31:15 +0300 From: Gleb Natapov <gleb@...hat.com> To: David Daney <ddaney@...iumnetworks.com> Cc: David Daney <ddaney.cavm@...il.com>, kvm@...r.kernel.org, linux-mips@...ux-mips.org, ralf@...ux-mips.org, Sanjay Lal <sanjayl@...asys.com>, linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com> Subject: Re: [PATCH 00/31] KVM/MIPS: Implement hardware virtualization via the MIPS-VZ extensions. On Fri, Jun 07, 2013 at 04:15:00PM -0700, David Daney wrote: > I should also add that I will shortly send patches for the kvm tool > required to drive this VM as well as a small set of patches that > create a para-virtualized MIPS/Linux guest kernel. > > The idea is that because there is no standard SMP linux system, we > create a standard para-virtualized system that uses a handful of > hypercalls, but mostly just uses virtio devices. It has no emulated > real hardware (no 8250 UART, no emulated legacy anything...) > Virtualization is useful for running legacy code. Why dismiss support for non pv guests so easily? How different MIPS SMP systems are? What about running non pv UP systems? > David Daney > > > On 06/07/2013 04:03 PM, David Daney wrote: > >From: David Daney <david.daney@...ium.com> > > > >These patches take a somewhat different approach to MIPS > >virtualization via the MIPS-VZ extensions than the patches previously > >sent by Sanjay Lal. > > > >Several facts about the code: > > > >o Existing exception handlers are modified to hook in to KVM instead > > of intercepting all exceptions via the EBase register, and then > > chaining to real exception handlers. > > > >o Able to boot 64-bit SMP guests that use the FPU (I have booted 4-way > > SMP 64-bit MIPS/Linux). > > > >o Additional overhead on every exception even when *no* vCPU is running. > > > >o Lower interrupt overhead, than the EBase interception method, when > > vCPU *is* running. > > > >o This code is somewhat smaller than the existing trap/emulate > > implementation (about 2100 lines vs. about 5300 lines) > > > >o Currently probably only usable on the OCTEON III CPU model, as some > > MIPS-VZ implementation-defined behaviors were assumed to have the > > OCTEON III behavior. > > > >Note: I think Ralf already has the 17/31 (MIPS: Quit exposing Kconfig > >symbols in uapi headers.) queued, but I also include it here. > > > >David Daney (31): > > MIPS: Move allocate_kscratch to cpu-probe.c and make it public. > > MIPS: Save and restore K0/K1 when CONFIG_KVM_MIPSVZ > > mips/kvm: Fix 32-bitisms in kvm_locore.S > > mips/kvm: Add casts to avoid pointer width mismatch build failures. > > mips/kvm: Use generic cache flushing functions. > > mips/kvm: Rename kvm_vcpu_arch.pc to kvm_vcpu_arch.epc > > mips/kvm: Rename VCPU_registername to KVM_VCPU_ARCH_registername > > mips/kvm: Fix code formatting in arch/mips/kvm/kvm_locore.S > > mips/kvm: Factor trap-and-emulate support into a pluggable > > implementation. > > mips/kvm: Implement ioctls to get and set FPU registers. > > MIPS: Rearrange branch.c so it can be used by kvm code. > > MIPS: Add instruction format information for WAIT, MTC0, MFC0, et al. > > mips/kvm: Add accessors for MIPS VZ registers. > > mips/kvm: Add thread_info flag to indicate operation in MIPS VZ Guest > > Mode. > > mips/kvm: Exception handling to leave and reenter guest mode. > > mips/kvm: Add exception handler for MIPSVZ Guest exceptions. > > MIPS: Quit exposing Kconfig symbols in uapi headers. > > mips/kvm: Add pt_regs slots for BadInstr and BadInstrP > > mips/kvm: Add host definitions for MIPS VZ based host. > > mips/kvm: Hook into TLB fault handlers. > > mips/kvm: Allow set_except_vector() to be used from MIPSVZ code. > > mips/kvm: Split get_new_mmu_context into two parts. > > mips/kvm: Hook into CP unusable exception handler. > > mips/kvm: Add thread_struct fields used by MIPSVZ hosts. > > mips/kvm: Add some asm-offsets constants used by MIPSVZ. > > mips/kvm: Split up Kconfig and Makefile definitions in preperation > > for MIPSVZ. > > mips/kvm: Gate the use of kvm_local_flush_tlb_all() by KVM_MIPSTE > > mips/kvm: Only use KVM_COALESCED_MMIO_PAGE_OFFSET with KVM_MIPSTE > > mips/kvm: Add MIPSVZ support. > > mips/kvm: Enable MIPSVZ in Kconfig/Makefile > > mips/kvm: Allow for upto 8 KVM vcpus per vm. > > > > arch/mips/Kconfig | 1 + > > arch/mips/include/asm/branch.h | 7 + > > arch/mips/include/asm/kvm_host.h | 622 +----------- > > arch/mips/include/asm/kvm_mips_te.h | 589 +++++++++++ > > arch/mips/include/asm/kvm_mips_vz.h | 29 + > > arch/mips/include/asm/mipsregs.h | 264 +++++ > > arch/mips/include/asm/mmu_context.h | 12 +- > > arch/mips/include/asm/processor.h | 6 + > > arch/mips/include/asm/ptrace.h | 36 + > > arch/mips/include/asm/stackframe.h | 150 ++- > > arch/mips/include/asm/thread_info.h | 2 + > > arch/mips/include/asm/uasm.h | 2 +- > > arch/mips/include/uapi/asm/inst.h | 23 +- > > arch/mips/include/uapi/asm/ptrace.h | 17 +- > > arch/mips/kernel/asm-offsets.c | 124 ++- > > arch/mips/kernel/branch.c | 63 +- > > arch/mips/kernel/cpu-probe.c | 34 + > > arch/mips/kernel/genex.S | 8 + > > arch/mips/kernel/scall64-64.S | 12 + > > arch/mips/kernel/scall64-n32.S | 12 + > > arch/mips/kernel/traps.c | 15 +- > > arch/mips/kvm/Kconfig | 23 +- > > arch/mips/kvm/Makefile | 15 +- > > arch/mips/kvm/kvm_locore.S | 980 +++++++++--------- > > arch/mips/kvm/kvm_mips.c | 768 ++------------ > > arch/mips/kvm/kvm_mips_comm.h | 1 + > > arch/mips/kvm/kvm_mips_commpage.c | 9 +- > > arch/mips/kvm/kvm_mips_dyntrans.c | 4 +- > > arch/mips/kvm/kvm_mips_emul.c | 312 +++--- > > arch/mips/kvm/kvm_mips_int.c | 53 +- > > arch/mips/kvm/kvm_mips_int.h | 2 - > > arch/mips/kvm/kvm_mips_stats.c | 6 +- > > arch/mips/kvm/kvm_mipsvz.c | 1894 +++++++++++++++++++++++++++++++++++ > > arch/mips/kvm/kvm_mipsvz_guest.S | 234 +++++ > > arch/mips/kvm/kvm_tlb.c | 140 +-- > > arch/mips/kvm/kvm_trap_emul.c | 932 +++++++++++++++-- > > arch/mips/mm/fault.c | 8 + > > arch/mips/mm/tlbex-fault.S | 6 + > > arch/mips/mm/tlbex.c | 45 +- > > 39 files changed, 5299 insertions(+), 2161 deletions(-) > > create mode 100644 arch/mips/include/asm/kvm_mips_te.h > > create mode 100644 arch/mips/include/asm/kvm_mips_vz.h > > create mode 100644 arch/mips/kvm/kvm_mipsvz.c > > create mode 100644 arch/mips/kvm/kvm_mipsvz_guest.S > > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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