From: Jan Beulich <jbeulich@suse.com>
To: Simon Leiner <simon@leiner.me>
Cc: xen-devel@lists.xenproject.org, sstabellini@kernel.org,
jgross@suse.com, julien@xen.org
Subject: Re: [PATCH 2/2] arm/xen: Add misuse warning to virt_to_gfn
Date: Tue, 25 Aug 2020 14:16:07 +0200 [thread overview]
Message-ID: <374f42a0-b618-8b90-71b5-0a865ea1ddbb@suse.com> (raw)
In-Reply-To: <20200825093153.35500-2-simon@leiner.me>
On 25.08.2020 11:31, Simon Leiner wrote:
> --- a/include/xen/arm/page.h
> +++ b/include/xen/arm/page.h
> @@ -76,7 +76,11 @@ static inline unsigned long bfn_to_pfn(unsigned long bfn)
> #define bfn_to_local_pfn(bfn) bfn_to_pfn(bfn)
>
> /* VIRT <-> GUEST conversion */
> -#define virt_to_gfn(v) (pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT))
> +#define virt_to_gfn(v) \
> + ({ \
> + WARN_ON_ONCE(is_vmalloc_addr(v)); \
> + pfn_to_gfn(virt_to_phys(v) >> XEN_PAGE_SHIFT); \
> + })
Shouldn't such a check cover more than just the vmalloc range,
i.e. everything outside of what __va() can validly return?
Jan
next prev parent reply other threads:[~2020-08-25 12:16 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Aw: [Linux] [ARM] Granting memory obtained from the DMA API>
2020-08-25 9:31 ` [PATCH 1/2] xen/xenbus: Fix granting of vmalloc'd memory Simon Leiner
2020-08-25 9:31 ` [PATCH 2/2] arm/xen: Add misuse warning to virt_to_gfn Simon Leiner
2020-08-25 12:16 ` Jan Beulich [this message]
2020-08-25 23:48 ` Stefano Stabellini
2020-08-26 6:20 ` Jan Beulich
2020-08-26 7:50 ` Simon Leiner
2020-08-26 7:59 ` Jürgen Groß
2020-08-26 8:14 ` Simon Leiner
2020-08-26 8:27 ` Jürgen Groß
2020-08-26 8:30 ` Simon Leiner
2020-08-25 23:58 ` Stefano Stabellini
2020-08-26 18:37 ` Julien Grall
2020-08-27 5:21 ` Jürgen Groß
2020-08-27 8:24 ` Julien Grall
2020-08-27 8:35 ` Jürgen Groß
2020-08-27 16:04 ` Stefano Stabellini
2020-08-25 23:55 ` [PATCH 1/2] xen/xenbus: Fix granting of vmalloc'd memory Stefano Stabellini
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