From: Paul Mackerras <paulus@ozlabs.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: linuxppc-dev@lists.ozlabs.org,
David Gibson <david@gibson.dropbear.id.au>,
kvm-ppc@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH kernel v2 5/6] KVM: PPC: Move reusable bits of H_PUT_TCE handler to helpers
Date: Thu, 11 Feb 2016 15:39:37 +1100 [thread overview]
Message-ID: <20160211043937.GC9757@oak.ozlabs.ibm.com> (raw)
In-Reply-To: <1453361977-19589-6-git-send-email-aik@ozlabs.ru>
On Thu, Jan 21, 2016 at 06:39:36PM +1100, Alexey Kardashevskiy wrote:
> Upcoming multi-tce support (H_PUT_TCE_INDIRECT/H_STUFF_TCE hypercalls)
> will validate TCE (not to have unexpected bits) and IO address
> (to be within the DMA window boundaries).
>
> This introduces helpers to validate TCE and IO address. The helpers are
> exported as they compile into vmlinux (to work in realmode) and will be
> used later by KVM kernel module in virtual mode.
Comments below...
> +/* Note on the use of page_address() in real mode,
> + *
> + * It is safe to use page_address() in real mode on ppc64 because
> + * page_address() is always defined as lowmem_page_address()
> + * which returns __va(PFN_PHYS(page_to_pfn(page))) which is arithmetial
"arithmetic" not "arithmetial"
> + * operation and does not access page struct.
> + *
> + * Theoretically page_address() could be defined different
> + * but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL
> + * should be enabled.
"would have to be enabled" not "should be enabled"
Apart from those nits, the patch looks fine.
Paul.
next prev parent reply other threads:[~2016-02-11 5:10 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 7:39 [PATCH kernel v2 0/6] KVM: PPC: Add in-kernel multitce handling Alexey Kardashevskiy
2016-01-21 7:39 ` [PATCH kernel v2 1/6] KVM: PPC: Rework H_PUT_TCE/H_GET_TCE handlers Alexey Kardashevskiy
2016-01-22 0:42 ` David Gibson
2016-01-22 1:59 ` Alexey Kardashevskiy
2016-01-24 23:43 ` David Gibson
2016-02-11 4:11 ` Paul Mackerras
2016-01-21 7:39 ` [PATCH kernel v2 2/6] KVM: PPC: Use RCU for arch.spapr_tce_tables Alexey Kardashevskiy
2016-01-24 23:46 ` David Gibson
2016-01-21 7:39 ` [PATCH kernel v2 3/6] KVM: PPC: Account TCE-containing pages in locked_vm Alexey Kardashevskiy
2016-01-24 23:57 ` David Gibson
2016-01-21 7:39 ` [PATCH kernel v2 4/6] KVM: PPC: Replace SPAPR_TCE_SHIFT with IOMMU_PAGE_SHIFT_4K Alexey Kardashevskiy
2016-01-21 7:39 ` [PATCH kernel v2 5/6] KVM: PPC: Move reusable bits of H_PUT_TCE handler to helpers Alexey Kardashevskiy
2016-01-25 0:12 ` David Gibson
2016-01-25 0:18 ` David Gibson
2016-02-11 4:39 ` Paul Mackerras [this message]
2016-01-21 7:39 ` [PATCH kernel v2 6/6] KVM: PPC: Add support for multiple-TCE hcalls Alexey Kardashevskiy
2016-01-21 7:56 ` kbuild test robot
2016-01-21 8:09 ` Alexey Kardashevskiy
2016-01-25 0:44 ` David Gibson
2016-01-25 1:24 ` Alexey Kardashevskiy
2016-01-25 5:21 ` David Gibson
2016-02-11 5:32 ` Paul Mackerras
2016-02-12 4:54 ` Alexey Kardashevskiy
2016-02-12 5:52 ` Paul Mackerras
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