From: Julien Grall <julien.grall@arm.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu
Cc: marc.zyngier@arm.com, catalin.marinas@arm.com,
will.deacon@arm.com, Russell King <linux@armlinux.org.uk>,
Julien Grall <julien.grall@arm.com>
Subject: [PATCH v3 00/15] kvm/arm: Align the VMID allocation with the arm64 ASID one
Date: Wed, 24 Jul 2019 17:25:19 +0100 [thread overview]
Message-ID: <20190724162534.7390-1-julien.grall@arm.com> (raw)
Hi all,
This patch series is moving out the ASID allocator in a separate file in order
to re-use it for the VMID. The benefits are:
- CPUs are not forced to exit on a roll-over.
- Context invalidation is now per-CPU rather than
broadcasted.
There are no performance regression on the fastpath for ASID allocation.
Actually on the hackbench measurement (300 hackbench) it was .7% faster.
The measurement was made on a Seattle based SoC (8 CPUs), with the
number of VMID limited to 4-bit. The test involves running concurrently 40
guests with 2 vCPUs. Each guest will then execute hackbench 5 times
before exiting.
The performance difference (on 5.1-rc1) between the current algo and the
new one are:
- 2.5% less exit from the guest
- 22.4% more flush, although they are now local rather than broadcasted
- 0.11% faster (just for the record)
The ASID allocator rework to make it generic has been divided in multiple
patches to make the review easier.
A branch with the patch based on 5.3-rc1 can be found:
http://xenbits.xen.org/gitweb/?p=people/julieng/linux-arm.git;a=shortlog;h=refs/heads/vmid-rework/v3
For all the changes see in each patch.
Best regards,
Cc: Russell King <linux@armlinux.org.uk>
Julien Grall (15):
arm64/mm: Introduce asid_info structure and move
asid_generation/asid_map to it
arm64/mm: Move active_asids and reserved_asids to asid_info
arm64/mm: Move bits to asid_info
arm64/mm: Move the variable lock and tlb_flush_pending to asid_info
arm64/mm: Remove dependency on MM in new_context
arm64/mm: Store the number of asid allocated per context
arm64/mm: Introduce NUM_ASIDS
arm64/mm: Split asid_inits in 2 parts
arm64/mm: Split the function check_and_switch_context in 3 parts
arm64/mm: Introduce a callback to flush the local context
arm64: Move the ASID allocator code in a separate file
arm64/lib: Add an helper to free memory allocated by the ASID
allocator
arm/kvm: Introduce a new VMID allocator
arch/arm64: Introduce a capability to tell whether 16-bit VMID is
available
kvm/arm: Align the VMID allocation with the arm64 ASID one
arch/arm/include/asm/kvm_asm.h | 2 +-
arch/arm/include/asm/kvm_host.h | 5 +-
arch/arm/include/asm/kvm_hyp.h | 1 +
arch/arm/include/asm/kvm_mmu.h | 3 +-
arch/arm/include/asm/lib_asid.h | 79 +++++++++++++++
arch/arm/kvm/Makefile | 1 +
arch/arm/kvm/hyp/tlb.c | 8 +-
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/kvm_asid.h | 8 ++
arch/arm64/include/asm/kvm_asm.h | 2 +-
arch/arm64/include/asm/kvm_host.h | 5 +-
arch/arm64/include/asm/kvm_mmu.h | 7 +-
arch/arm64/include/asm/lib_asid.h | 79 +++++++++++++++
arch/arm64/kernel/cpufeature.c | 9 ++
arch/arm64/kvm/hyp/tlb.c | 10 +-
arch/arm64/lib/Makefile | 2 +
arch/arm64/lib/asid.c | 190 ++++++++++++++++++++++++++++++++++++
arch/arm64/mm/context.c | 200 +++++---------------------------------
virt/kvm/arm/arm.c | 125 +++++++++---------------
19 files changed, 458 insertions(+), 281 deletions(-)
create mode 100644 arch/arm/include/asm/lib_asid.h
create mode 100644 arch/arm64/include/asm/kvm_asid.h
create mode 100644 arch/arm64/include/asm/lib_asid.h
create mode 100644 arch/arm64/lib/asid.c
--
2.11.0
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next reply other threads:[~2019-07-24 16:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 16:25 Julien Grall [this message]
2019-07-24 16:25 ` [PATCH v3 01/15] arm64/mm: Introduce asid_info structure and move asid_generation/asid_map to it Julien Grall
2019-07-24 16:25 ` [PATCH v3 02/15] arm64/mm: Move active_asids and reserved_asids to asid_info Julien Grall
2019-07-24 16:25 ` [PATCH v3 03/15] arm64/mm: Move bits " Julien Grall
2019-07-24 16:25 ` [PATCH v3 04/15] arm64/mm: Move the variable lock and tlb_flush_pending " Julien Grall
2019-07-24 16:25 ` [PATCH v3 05/15] arm64/mm: Remove dependency on MM in new_context Julien Grall
2019-07-24 16:25 ` [PATCH v3 06/15] arm64/mm: Store the number of asid allocated per context Julien Grall
2019-07-24 16:25 ` [PATCH v3 07/15] arm64/mm: Introduce NUM_ASIDS Julien Grall
2019-07-24 16:25 ` [PATCH v3 08/15] arm64/mm: Split asid_inits in 2 parts Julien Grall
2019-07-24 16:25 ` [PATCH v3 09/15] arm64/mm: Split the function check_and_switch_context in 3 parts Julien Grall
2019-07-25 16:28 ` Catalin Marinas
2019-07-24 16:25 ` [PATCH v3 10/15] arm64/mm: Introduce a callback to flush the local context Julien Grall
2019-07-24 16:25 ` [PATCH v3 11/15] arm64: Move the ASID allocator code in a separate file Julien Grall
2019-07-24 16:25 ` [PATCH v3 12/15] arm64/lib: Add an helper to free memory allocated by the ASID allocator Julien Grall
2019-07-24 16:25 ` [PATCH v3 13/15] arm/kvm: Introduce a new VMID allocator Julien Grall
2019-07-24 16:25 ` [PATCH v3 14/15] arch/arm64: Introduce a capability to tell whether 16-bit VMID is available Julien Grall
2019-07-24 16:25 ` [PATCH v3 15/15] kvm/arm: Align the VMID allocation with the arm64 ASID one Julien Grall
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