linux-kernel - Re: [PATCH v2 01/17] KVM: PPC: Book3S HV: simplify kvm_cma

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Message-ID: <87tuxio6us.fsf@dja-thinkpad.axtens.net>
Date:   Tue, 04 Aug 2020 23:53:15 +1000
From:   Daniel Axtens <dja@...ens.net>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>, Baoquan He <bhe@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Ingo Molnar <mingo@...hat.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Rapoport <rppt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        clang-built-linux@...glegroups.com,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org
Subject: Re: [PATCH v2 01/17] KVM: PPC: Book3S HV: simplify kvm_cma_reserve()

Hi Mike,

>
> The memory size calculation in kvm_cma_reserve() traverses memblock.memory
> rather than simply call memblock_phys_mem_size(). The comment in that
> function suggests that at some point there should have been call to
> memblock_analyze() before memblock_phys_mem_size() could be used.
> As of now, there is no memblock_analyze() at all and
> memblock_phys_mem_size() can be used as soon as cold-plug memory is
> registerd with memblock.
>
> Replace loop over memblock.memory with a call to memblock_phys_mem_size().
>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>  arch/powerpc/kvm/book3s_hv_builtin.c | 11 ++---------
>  1 file changed, 2 insertions(+), 9 deletions(-)
>
> diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
> index 7cd3cf3d366b..56ab0d28de2a 100644
> --- a/arch/powerpc/kvm/book3s_hv_builtin.c
> +++ b/arch/powerpc/kvm/book3s_hv_builtin.c
> @@ -95,22 +95,15 @@ EXPORT_SYMBOL_GPL(kvm_free_hpt_cma);
>  void __init kvm_cma_reserve(void)
>  {
>  	unsigned long align_size;
> -	struct memblock_region *reg;
> -	phys_addr_t selected_size = 0;
> +	phys_addr_t selected_size;
>  
>  	/*
>  	 * We need CMA reservation only when we are in HV mode
>  	 */
>  	if (!cpu_has_feature(CPU_FTR_HVMODE))
>  		return;
> -	/*
> -	 * We cannot use memblock_phys_mem_size() here, because
> -	 * memblock_analyze() has not been called yet.
> -	 */
> -	for_each_memblock(memory, reg)
> -		selected_size += memblock_region_memory_end_pfn(reg) -
> -				 memblock_region_memory_base_pfn(reg);
>  
> +	selected_size = PHYS_PFN(memblock_phys_mem_size());
>  	selected_size = (selected_size * kvm_cma_resv_ratio / 100) << PAGE_SHIFT;

I think this is correct, but PHYS_PFN does x >> PAGE_SHIFT and then the
next line does x << PAGE_SHIFT, so I think we could combine those two
lines as:

selected_size = PAGE_ALIGN(memblock_phys_mem_size() * kvm_cma_resv_ratio / 100);

(I think that might technically change it from aligning down to aligning
up but I don't think 1 page matters here.)

Kind regards,
Daniel


>  	if (selected_size) {
>  		pr_debug("%s: reserving %ld MiB for global area\n", __func__,
> -- 
> 2.26.2