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Message-ID: <20250911063433.13783-1-jgross@suse.com> Date: Thu, 11 Sep 2025 08:34:19 +0200 From: Juergen Gross <jgross@...e.com> To: linux-kernel@...r.kernel.org, x86@...nel.org, linux-hyperv@...r.kernel.org, virtualization@...ts.linux.dev, loongarch@...ts.linux.dev, linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org, kvm@...r.kernel.org Cc: Juergen Gross <jgross@...e.com>, Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, "K. Y. Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, Peter Zijlstra <peterz@...radead.org>, Will Deacon <will@...nel.org>, Boqun Feng <boqun.feng@...il.com>, Waiman Long <longman@...hat.com>, Jiri Kosina <jikos@...nel.org>, Josh Poimboeuf <jpoimboe@...nel.org>, Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, xen-devel@...ts.xenproject.org, Ajay Kaher <ajay.kaher@...adcom.com>, Alexey Makhalov <alexey.makhalov@...adcom.com>, Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Russell King <linux@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, Madhavan Srinivasan <maddy@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, Christophe Leroy <christophe.leroy@...roup.eu>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, linux-arm-kernel@...ts.infradead.org, Paolo Bonzini <pbonzini@...hat.com>, Vitaly Kuznetsov <vkuznets@...hat.com>, Stefano Stabellini <sstabellini@...nel.org>, Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>, Daniel Lezcano <daniel.lezcano@...aro.org> Subject: [PATCH 00/14] paravirt: cleanup and reorg Some cleanups and reorg of paravirt code and headers: - The first 2 patches should be not controversial at all, as they remove just some no longer needed #include and struct forward declarations. - The 3rd patch is removing CONFIG_PARAVIRT_DEBUG, which IMO has no real value, as it just changes a crash to a BUG() (the stack trace will basically be the same). As the maintainer of the main paravirt user (Xen) I have never seen this crash/BUG() to happen. - The 4th patch is just a movement of code. - I don't know for what reason asm/paravirt_api_clock.h was added, as all archs supporting it do it exactly in the same way. Patch 5 is removing it. - Patches 6-12 are streamlining the paravirt clock interfaces by using a common implementation across architectures where possible and by moving the related code into common sched code, as this is where it should live. - Patches 13+14 are more like RFC material: patch 13 is doing some preparation work to enable patch 14 to move all spinlock related paravirt functions into qspinlock.h. If this approach is accepted, I'd like to continue with this work by moving most (or all?) paravirt functions from paravirt.h into the headers where their native counterparts are defined. This is meant to keep the native and paravirt function definitions together in one place and hopefully to be able to reduce the include hell with paravirt. Juergen Gross (14): x86/paravirt: remove not needed includes of paravirt.h x86/paravirt: remove some unneeded struct declarations x86/paravirt: remove PARAVIRT_DEBUG config option x86/paravirt: move thunk macros to paravirt_types.h paravirt: remove asm/paravirt_api_clock.h sched: move clock related paravirt code to kernel/sched arm/paravirt: use common code for paravirt_steal_clock() arm64/paravirt: use common code for paravirt_steal_clock() loongarch/paravirt: use common code for paravirt_steal_clock() riscv/paravirt: use common code for paravirt_steal_clock() x86/paravirt: use common code for paravirt_steal_clock() x86/paravirt: move paravirt_sched_clock() related code into tsc.c x86/paravirt: allow pv-calls outside paravirt.h x86/pvlocks: move paravirt spinlock functions into qspinlock.h arch/Kconfig | 3 + arch/arm/Kconfig | 1 + arch/arm/include/asm/paravirt.h | 22 --- arch/arm/include/asm/paravirt_api_clock.h | 1 - arch/arm/kernel/Makefile | 1 - arch/arm/kernel/paravirt.c | 23 --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/paravirt.h | 14 -- arch/arm64/include/asm/paravirt_api_clock.h | 1 - arch/arm64/kernel/paravirt.c | 11 +- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/paravirt.h | 13 -- .../include/asm/paravirt_api_clock.h | 1 - arch/loongarch/kernel/paravirt.c | 10 +- arch/powerpc/include/asm/paravirt.h | 3 - arch/powerpc/include/asm/paravirt_api_clock.h | 2 - arch/powerpc/platforms/pseries/setup.c | 4 +- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/paravirt.h | 14 -- arch/riscv/include/asm/paravirt_api_clock.h | 1 - arch/riscv/kernel/paravirt.c | 11 +- arch/x86/Kconfig | 8 +- arch/x86/entry/entry_64.S | 1 - arch/x86/entry/vsyscall/vsyscall_64.c | 1 - arch/x86/hyperv/hv_spinlock.c | 1 - arch/x86/include/asm/apic.h | 4 - arch/x86/include/asm/highmem.h | 1 - arch/x86/include/asm/mmu_context.h | 1 - arch/x86/include/asm/mshyperv.h | 1 - arch/x86/include/asm/paravirt.h | 166 ------------------ arch/x86/include/asm/paravirt_api_clock.h | 1 - arch/x86/include/asm/paravirt_types.h | 82 +++++++-- arch/x86/include/asm/pgtable_32.h | 1 - arch/x86/include/asm/qspinlock.h | 49 +++++- arch/x86/include/asm/spinlock.h | 1 - arch/x86/include/asm/timer.h | 1 + arch/x86/include/asm/tlbflush.h | 4 - arch/x86/kernel/apm_32.c | 1 - arch/x86/kernel/callthunks.c | 1 - arch/x86/kernel/cpu/bugs.c | 1 - arch/x86/kernel/cpu/vmware.c | 1 + arch/x86/kernel/kvm.c | 1 + arch/x86/kernel/kvmclock.c | 1 + arch/x86/kernel/paravirt.c | 16 -- arch/x86/kernel/tsc.c | 10 +- arch/x86/kernel/vsmp_64.c | 1 - arch/x86/kernel/x86_init.c | 1 - arch/x86/lib/cache-smp.c | 1 - arch/x86/mm/init.c | 1 - arch/x86/xen/spinlock.c | 1 - arch/x86/xen/time.c | 2 + drivers/clocksource/hyperv_timer.c | 2 + drivers/xen/time.c | 2 +- include/linux/sched/cputime.h | 18 ++ kernel/sched/core.c | 5 + kernel/sched/cputime.c | 13 ++ kernel/sched/sched.h | 3 +- 57 files changed, 182 insertions(+), 362 deletions(-) delete mode 100644 arch/arm/include/asm/paravirt.h delete mode 100644 arch/arm/include/asm/paravirt_api_clock.h delete mode 100644 arch/arm/kernel/paravirt.c delete mode 100644 arch/arm64/include/asm/paravirt_api_clock.h delete mode 100644 arch/loongarch/include/asm/paravirt_api_clock.h delete mode 100644 arch/powerpc/include/asm/paravirt_api_clock.h delete mode 100644 arch/riscv/include/asm/paravirt_api_clock.h delete mode 100644 arch/x86/include/asm/paravirt_api_clock.h -- 2.51.0
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