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95a6432ce9
linux/arch/powerpc/kvm
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Paul Mackerras 95a6432ce9 KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests 
This creates an alternative guest entry/exit path which is used for
radix guests on POWER9 systems when we have indep_threads_mode=Y.  In
these circumstances there is exactly one vcpu per vcore and there is
no coordination required between vcpus or vcores; the vcpu can enter
the guest without needing to synchronize with anything else.

The new fast path is implemented almost entirely in C in book3s_hv.c
and runs with the MMU on until the guest is entered.  On guest exit
we use the existing path until the point where we are committed to
exiting the guest (as distinct from handling an interrupt in the
low-level code and returning to the guest) and we have pulled the
guest context from the XIVE.  At that point we check a flag in the
stack frame to see whether we came in via the old path and the new
path; if we came in via the new path then we go back to C code to do
the rest of the process of saving the guest context and restoring the
host context.

The C code is split into separate functions for handling the
OS-accessible state and the hypervisor state, with the idea that the
latter can be replaced by a hypercall when we implement nested
virtualization.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[mpe: Fix CONFIG_ALTIVEC=n build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-10-09 16:04:27 +11:00
..
book3s_32_mmu_host.c powerpc/mm: Move hash related mmu-*.h headers to book3s/ 2016-03-03 21:19:21 +11:00
book3s_32_mmu.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
book3s_32_sr.S
book3s_64_mmu_host.c * ARM: HYP mode stub supports kexec/kdump on 32-bit; improved PMU 2017-05-08 12:37:56 -07:00
book3s_64_mmu_hv.c PPC KVM fixes for 4.19 2018-09-04 21:12:46 +02:00
book3s_64_mmu_radix.c KVM: PPC: Book3S HV: Don't use compound_order to determine host mapping size 2018-09-12 08:50:50 +10:00
book3s_64_mmu.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
book3s_64_slb.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
book3s_64_vio_hv.c KVM: PPC: Remove redundand permission bits removal 2018-10-09 16:04:27 +11:00
book3s_64_vio.c KVM: PPC: Remove redundand permission bits removal 2018-10-09 16:04:27 +11:00
book3s_emulate.c KVM: PPC: Book3S PR: Fix failure status setting in tabort. emulation 2018-06-13 09:46:13 +10:00
book3s_exports.c
book3s_hv_builtin.c KVM: PPC: Book3S HV: Move interrupt delivery on guest entry to C code 2018-10-09 16:04:27 +11:00
book3s_hv_hmi.c powerpc: move hmi.c to arch/powerpc/kvm/ 2016-09-09 16:18:07 +10:00
book3s_hv_interrupts.S KVM: PPC: Book3S HV: Extract PMU save/restore operations as C-callable functions 2018-10-09 16:04:27 +11:00
book3s_hv_ras.c KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests 2018-10-09 16:04:27 +11:00
book3s_hv_rm_mmu.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
book3s_hv_rm_xics.c KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
book3s_hv_rm_xive.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
book3s_hv_rmhandlers.S KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests 2018-10-09 16:04:27 +11:00
book3s_hv_tm_builtin.c KVM: PPC: Move nip/ctr/lr/xer registers to pt_regs in kvm_vcpu_arch 2018-05-18 15:38:23 +10:00
book3s_hv_tm.c KVM: PPC: Move nip/ctr/lr/xer registers to pt_regs in kvm_vcpu_arch 2018-05-18 15:38:23 +10:00
book3s_hv.c KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests 2018-10-09 16:04:27 +11:00
book3s_interrupts.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
book3s_mmu_hpte.c sched/headers: Prepare to use <linux/rcuupdate.h> instead of <linux/rculist.h> in <linux/sched.h> 2017-03-02 08:42:38 +01:00
book3s_paired_singles.c
book3s_pr_papr.c KVM: PPC: Book3S PR: Enable in-kernel TCE handlers for PR KVM 2017-10-14 16:38:19 +11:00
book3s_pr.c KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
book3s_rmhandlers.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
book3s_rtas.c KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller 2017-04-27 21:37:29 +10:00
book3s_segment.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
book3s_xics.c KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
book3s_xics.h KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller 2017-04-27 21:37:29 +10:00
book3s_xive_template.c KVM: PPC: Book3S HV: Remove left-over code in XICS-on-XIVE emulation 2018-10-09 16:04:27 +11:00
book3s_xive.c KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests 2018-10-09 16:04:27 +11:00
book3s_xive.h KVM: PPC: Book3S HV: Enable use of the new XIVE "single escalation" feature 2018-01-19 12:10:21 +11:00
book3s.c KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
book3s.h KVM: PPC: Book3S PR: Add guard code to prevent returning to guest with PR=0 and Transactional state 2018-06-01 10:30:39 +10:00
booke_emulate.c KVM: PPC: Move nip/ctr/lr/xer registers to pt_regs in kvm_vcpu_arch 2018-05-18 15:38:23 +10:00
booke_interrupts.S
booke.c KVM: PPC: Move nip/ctr/lr/xer registers to pt_regs in kvm_vcpu_arch 2018-05-18 15:38:23 +10:00
booke.h
bookehv_interrupts.S
e500_emulate.c KVM: PPC: Move nip/ctr/lr/xer registers to pt_regs in kvm_vcpu_arch 2018-05-18 15:38:23 +10:00
e500_mmu_host.c KVM: PPC: Reimplement non-SIMD LOAD/STORE instruction mmio emulation with analyse_instr() input 2018-05-22 19:51:08 +10:00
e500_mmu_host.h
e500_mmu.c KVM: PPC: Move nip/ctr/lr/xer registers to pt_regs in kvm_vcpu_arch 2018-05-18 15:38:23 +10:00
e500.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
e500.h
e500mc.c powerpc: remove unnecessary inclusion of asm/tlbflush.h 2018-07-30 22:48:20 +10:00
emulate_loadstore.c KVM: PPC: Remove mmio_vsx_tx_sx_enabled in KVM MMIO emulation 2018-07-18 15:14:45 +10:00
emulate.c powerpc/64s: Remove POWER4 support 2018-04-01 00:47:50 +11:00
fpu.S
irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig Second PPC KVM update for 4.16 2018-02-09 22:03:06 +01:00
Makefile KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file 2018-05-31 11:35:12 +10:00
mpic.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
powerpc.c Minor code cleanups for PPC. 2018-08-19 10:38:36 -07:00
timing.c KVM: PPC: Use seq_puts() in kvmppc_exit_timing_show() 2018-01-11 20:36:06 +11:00
timing.h
tm.S KVM: PPC: Book3S: Rework TM save/restore code and make it C-callable 2018-10-09 16:04:27 +11:00
trace_book3s.h KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
trace_booke.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_hv.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_pr.h KVM: PPC: Remove unused kvm_unmap_hva callback 2018-03-19 10:08:29 +11:00
trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00