kernel_samsung_sm7125

jenna

History

Paul Mackerras 19ccb76a19 KVM: PPC: Implement H_CEDE hcall for book3s_hv in real-mode code With a KVM guest operating in SMT4 mode (i.e. 4 hardware threads per core), whenever a CPU goes idle, we have to pull all the other hardware threads in the core out of the guest, because the H_CEDE hcall is handled in the kernel. This is inefficient. This adds code to book3s_hv_rmhandlers.S to handle the H_CEDE hcall in real mode. When a guest vcpu does an H_CEDE hcall, we now only exit to the kernel if all the other vcpus in the same core are also idle. Otherwise we mark this vcpu as napping, save state that could be lost in nap mode (mainly GPRs and FPRs), and execute the nap instruction. When the thread wakes up, because of a decrementer or external interrupt, we come back in at kvm_start_guest (from the system reset interrupt vector), find the `napping' flag set in the paca, and go to the resume path. This has some other ramifications. First, when starting a core, we now start all the threads, both those that are immediately runnable and those that are idle. This is so that we don't have to pull all the threads out of the guest when an idle thread gets a decrementer interrupt and wants to start running. In fact the idle threads will all start with the H_CEDE hcall returning; being idle they will just do another H_CEDE immediately and go to nap mode. This required some changes to kvmppc_run_core() and kvmppc_run_vcpu(). These functions have been restructured to make them simpler and clearer. We introduce a level of indirection in the wait queue that gets woken when external and decrementer interrupts get generated for a vcpu, so that we can have the 4 vcpus in a vcore using the same wait queue. We need this because the 4 vcpus are being handled by one thread. Secondly, when we need to exit from the guest to the kernel, we now have to generate an IPI for any napping threads, because an HDEC interrupt doesn't wake up a napping thread. Thirdly, we now need to be able to handle virtual external interrupts and decrementer interrupts becoming pending while a thread is napping, and deliver those interrupts to the guest when the thread wakes. This is done in kvmppc_cede_reentry, just before fast_guest_return. Finally, since we are not using the generic kvm_vcpu_block for book3s_hv, and hence not calling kvm_arch_vcpu_runnable, we can remove the #ifdef from kvm_arch_vcpu_runnable. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>		14 years ago
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44x.c	KVM: PPC: Add sanity checking to vcpu_run	14 years ago
44x_emulate.c	KVM: PPC: fix exit accounting for SPRs, tlbwe, tlbsx	14 years ago
44x_tlb.c	KVM: PPC: e500: Add shadow PID support	14 years ago
44x_tlb.h	KVM: ppc: rename 44x MMU functions used in booke.c	16 years ago
Kconfig	Merge branch 'kvm-updates/3.1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	14 years ago
Makefile	KVM: PPC: Assemble book3s{,_hv}_rmhandlers.S separately	14 years ago
book3s.c	KVM: PPC: Deliver program interrupts right away instead of queueing them	14 years ago
book3s_32_mmu.c	KVM: PPC: Put segment registers in shared page	14 years ago
book3s_32_mmu_host.c	KVM: PPC: Implement correct SID mapping on Book3s_32	14 years ago
book3s_32_sr.S	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
book3s_64_mmu.c	KVM: PPC: Interpret SDR1 as HVA in PAPR mode	14 years ago
book3s_64_mmu_host.c	KVM: PPC: Implement correct SID mapping on Book3s_32	14 years ago
book3s_64_mmu_hv.c	KVM: PPC: book3s_hv: Add support for PPC970-family processors	14 years ago
book3s_64_slb.S	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
book3s_64_vio_hv.c	KVM: PPC: Accelerate H_PUT_TCE by implementing it in real mode	14 years ago
book3s_emulate.c	KVM: PPC: Stub emulate CFAR and PURR SPRs	14 years ago
book3s_exports.c	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
book3s_hv.c	KVM: PPC: Implement H_CEDE hcall for book3s_hv in real-mode code	14 years ago
book3s_hv_builtin.c	KVM: PPC: book3s_hv: Add support for PPC970-family processors	14 years ago
book3s_hv_interrupts.S	KVM: PPC: book3s_hv: Add support for PPC970-family processors	14 years ago
book3s_hv_rm_mmu.c	KVM: PPC: move compute_tlbie_rb to book3s common header	14 years ago
book3s_hv_rmhandlers.S	KVM: PPC: Implement H_CEDE hcall for book3s_hv in real-mode code	14 years ago
book3s_interrupts.S	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
book3s_mmu_hpte.c	KVM: PPC: Move fields between struct kvm_vcpu_arch and kvmppc_vcpu_book3s	14 years ago
book3s_paired_singles.c	Merge branch 'kvm-updates/2.6.37' of git://git.kernel.org/pub/scm/virt/kvm/kvm	14 years ago
book3s_pr.c	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
book3s_pr_papr.c	KVM: PPC: Add PAPR hypercall code for PR mode	14 years ago
book3s_rmhandlers.S	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
book3s_segment.S	KVM: PPC: book3s_pr: Simplify transitions between virtual and real mode	14 years ago
booke.c	KVM: PPC: Add sanity checking to vcpu_run	14 years ago
booke.h	KVM: PPC: e500: Add shadow PID support	14 years ago
booke_emulate.c	KVM: PPC: Convert SRR0 and SRR1 to shared page	14 years ago
booke_interrupts.S	KVM: PPC: e500: Add shadow PID support	14 years ago
e500.c	KVM: PPC: Add sanity checking to vcpu_run	14 years ago
e500_emulate.c	KVM: PPC: e500: Add shadow PID support	14 years ago
e500_tlb.c	KVM: PPC: e500: Don't search over the entire TLB0.	14 years ago
e500_tlb.h	KVM: PPC: e500: Add shadow PID support	14 years ago
emulate.c	KVM: PPC: booke: add sregs support	14 years ago
fpu.S	powerpc: Remove fpscr use from [kvm_]cvt_{fd,df}	15 years ago
powerpc.c	KVM: PPC: Implement H_CEDE hcall for book3s_hv in real-mode code	14 years ago
timing.c	KVM: PPC: fix partial application of "exit timing in ticks"	14 years ago
timing.h	KVM: powerpc: Fix BUILD_BUG_ON condition	15 years ago
trace.h	KVM: PPC: Add support for Book3S processors in hypervisor mode	14 years ago