From: Julien Grall <julien.grall@arm.com>
To: Sergej Proskurin <proskurin@sec.in.tum.de>,
xen-devel@lists.xenproject.org
Cc: Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [RFC PATCH v2 3/8] arm/mem_access: Add defines supporting PTs with varying page sizes
Date: Fri, 2 Jun 2017 09:27:30 +0100 [thread overview]
Message-ID: <586b3a0c-6dbf-123c-4c9a-3405c2ae0916@arm.com> (raw)
In-Reply-To: <20170601151906.10213-4-proskurin@sec.in.tum.de>
Hi Sergej,
On 06/01/2017 04:18 PM, Sergej Proskurin wrote:
> The ARMv8 architecture supports pages with different (4K, 16K, and 64K) sizes.
> To enable guest page table walks for various configurations, this commit
> extends the defines and helpers of the current implementation.
>
> Signed-off-by: Sergej Proskurin <proskurin@sec.in.tum.de>
> ---
> Cc: Stefano Stabellini <sstabellini@kernel.org>
> Cc: Julien Grall <julien.grall@arm.com>
> ---
> xen/include/asm-arm/page.h | 67 ++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 67 insertions(+)
>
> diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
> index 4b46e8831c..6222b1d4a2 100644
> --- a/xen/include/asm-arm/page.h
> +++ b/xen/include/asm-arm/page.h
> @@ -500,6 +500,73 @@ static inline int gva_to_ipa(vaddr_t va, paddr_t *paddr, unsigned int flags)
>
> #define PAGE_ALIGN(x) (((x) + PAGE_SIZE - 1) & PAGE_MASK)
>
> +#define LPAE_SHIFT_4K (9)
> +#define LPAE_SHIFT_16K (11)
> +#define LPAE_SHIFT_64K (13)
> +
> +#define LPAE_ENTRIES_4K (_AC(1,U) << LPAE_SHIFT_4K)
> +#define LPAE_ENTRIES_16K (_AC(1,U) << LPAE_SHIFT_16K)
> +#define LPAE_ENTRIES_64K (_AC(1,U) << LPAE_SHIFT_64K)
It sounds like to me you can introduce macros to avoid all the
redundancies as you did below for GUEST_TABLE_OFFSET.
This macro would take a granularity in parameter and create all the
*_gran define associated to it.
But I am not fully convinced they all need to be defined. You only use
them once and could easily use LPAE_SHIFT_*K to get what you need in the
guest page table walker.
Cheers,
--
Julien Grall
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next prev parent reply other threads:[~2017-06-02 8:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-01 15:18 [RFC PATCH v2 0/8] arm/mem_access: Walk guest page tables in SW if mem_access is active Sergej Proskurin
2017-06-01 15:18 ` [RFC PATCH v2 1/8] arm/mem_access: Add (TCR_|TTBCR_)* defines Sergej Proskurin
2017-06-02 7:31 ` Julien Grall
2017-06-07 14:56 ` Sergej Proskurin
2017-06-07 15:07 ` Julien Grall
2017-06-07 15:11 ` Julien Grall
2017-06-01 15:18 ` [RFC PATCH v2 2/8] arm/mem_access: Add defines holding the width of 32/64bit regs Sergej Proskurin
2017-06-01 15:18 ` [RFC PATCH v2 3/8] arm/mem_access: Add defines supporting PTs with varying page sizes Sergej Proskurin
2017-06-02 8:27 ` Julien Grall [this message]
2017-06-01 15:18 ` [RFC PATCH v2 4/8] arm/mem_access: Add short-descriptor pte typedefs Sergej Proskurin
2017-06-02 8:50 ` Julien Grall
2017-06-01 15:18 ` [RFC PATCH v2 5/8] arm/mem_access: Add software guest-page-table walk Sergej Proskurin
2017-06-02 9:02 ` Julien Grall
2017-06-08 12:43 ` Sergej Proskurin
2017-06-09 8:19 ` Julien Grall
2017-06-01 15:18 ` [RFC PATCH v2 6/8] arm/mem_access: Add long-descriptor based gpt Sergej Proskurin
2017-06-02 12:55 ` Julien Grall
2017-06-09 11:50 ` Sergej Proskurin
2017-06-09 12:39 ` Julien Grall
2017-06-12 10:12 ` Sergej Proskurin
2017-06-12 10:44 ` Julien Grall
2017-06-12 12:31 ` Sergej Proskurin
2017-06-01 15:18 ` [RFC PATCH v2 7/8] arm/mem_access: Add short-descriptor " Sergej Proskurin
2017-06-02 15:11 ` Julien Grall
2017-06-01 15:18 ` [RFC PATCH v2 8/8] arm/mem_access: Walk the guest's pt in software Sergej Proskurin
2017-06-01 15:18 ` [PATCH 1/8] arm/mem_access: Add (TCR_|TTBCR_)* defines Sergej Proskurin
2017-06-02 15:13 ` Julien Grall
2017-06-03 8:56 ` Sergej Proskurin
2017-06-01 15:19 ` [PATCH 2/8] arm/mem_access: Add defines holding the width of 32/64bit regs Sergej Proskurin
2017-06-01 15:19 ` [PATCH 3/8] arm/mem_access: Add defines supporting PTs with varying page sizes Sergej Proskurin
2017-06-01 15:19 ` [PATCH 4/8] arm/mem_access: Add short-descriptor pte typedefs Sergej Proskurin
2017-06-01 15:19 ` [PATCH 5/8] arm/mem_access: Add software guest-page-table walk Sergej Proskurin
2017-06-01 15:19 ` [PATCH 6/8] arm/mem_access: Add long-descriptor based gpt Sergej Proskurin
2017-06-01 15:19 ` [PATCH 7/8] arm/mem_access: Add short-descriptor " Sergej Proskurin
2017-06-01 15:19 ` [PATCH 8/8] arm/mem_access: Walk the guest's pt in software Sergej Proskurin
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