From: Sean Christopherson <seanjc@google.com>
To: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: akpm@linux-foundation.org, jeyu@kernel.org, bpf@vger.kernel.org,
ast@kernel.org, daniel@iogearbox.net, luto@kernel.org,
dave.hansen@linux.intel.com, peterz@infradead.org,
x86@kernel.org, rppt@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, dan.j.williams@intel.com,
elena.reshetova@intel.com, ira.weiny@intel.com
Subject: Re: [PATCH RFC 01/10] vmalloc: Add basic perm alloc implementation
Date: Fri, 4 Dec 2020 15:24:28 -0800 [thread overview]
Message-ID: <X8rFLHGSqJ7JCZ/N@google.com> (raw)
In-Reply-To: <20201120202426.18009-2-rick.p.edgecombe@intel.com>
On Fri, Nov 20, 2020, Rick Edgecombe wrote:
> +struct perm_allocation {
> + struct page **pages;
> + virtual_perm cur_perm;
> + virtual_perm orig_perm;
> + struct vm_struct *area;
> + unsigned long offset;
> + unsigned long size;
> + void *writable;
> +};
> +
> +/*
> + * Allocate a special permission kva region. The region may not be mapped
> + * until a call to perm_writable_finish(). A writable region will be mapped
> + * immediately at the address returned by perm_writable_addr(). The allocation
> + * will be made between the start and end virtual addresses.
> + */
> +struct perm_allocation *perm_alloc(unsigned long vstart, unsigned long vend, unsigned long page_cnt,
> + virtual_perm perms);
IMO, 'perm' as the root namespace is too generic, and perm_ is already very
prevelant throughout the kernel. E.g. it's not obvious when looking at the
callers that perm_alloc() is the first step in setting up an alternate kernel
VA->PA mapping.
I don't have a suggestion for a more intuitive name, but in the absence of a
perfect name, I'd vote for an acronym that is easy to grep. Something like
pvmap? That isn't currently used in the kernel, though I can't help but read it
as "paravirt map"...
next prev parent reply other threads:[~2020-12-04 23:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 20:24 [PATCH RFC 00/10] New permission vmalloc interface Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 01/10] vmalloc: Add basic perm alloc implementation Rick Edgecombe
2020-11-22 4:10 ` Andy Lutomirski
2020-11-23 0:01 ` Edgecombe, Rick P
2020-11-24 10:16 ` Christoph Hellwig
2020-11-24 20:00 ` Edgecombe, Rick P
2020-11-23 9:00 ` Christoph Hellwig
2020-11-23 20:44 ` Edgecombe, Rick P
2020-11-24 10:19 ` hch
2020-11-24 19:59 ` Edgecombe, Rick P
2020-12-04 23:24 ` Sean Christopherson [this message]
2020-12-07 23:55 ` Edgecombe, Rick P
2020-11-20 20:24 ` [PATCH RFC 02/10] bpf: Use perm_alloc() for BPF JIT filters Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 03/10] module: Use perm_alloc() for modules Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 04/10] module: Support separate writable allocation Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 05/10] x86/modules: Use real perm_allocations Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 06/10] x86/alternatives: Handle perm_allocs for modules Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 07/10] x86/unwind: Unwind orc at module writable address Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 08/10] jump_label: Handle " Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 09/10] ftrace: Use " Rick Edgecombe
2020-11-20 20:24 ` [PATCH RFC 10/10] vmalloc: Add perm_alloc x86 implementation Rick Edgecombe
2020-11-22 15:29 ` [vmalloc] 377647beed: WARNING:at_arch/x86/kernel/ftrace.c:#ftrace_verify_code kernel test robot
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