From: Jan Beulich <jbeulich@suse.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: "Stefano Stabellini" <sstabellini@kernel.org>,
"Julien Grall" <julien@xen.org>, "Wei Liu" <wl@xen.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"George Dunlap" <George.Dunlap@eu.citrix.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Varad Gautam" <vrd@amazon.de>,
"Ian Jackson" <ian.jackson@eu.citrix.com>,
"Hongyan Xia" <hongyxia@amazon.com>,
xen-devel@lists.xenproject.org,
"Paul Durrant" <pdurrant@amazon.co.uk>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH 2/8] x86/setup: Fix badpage= handling for memory above HYPERVISOR_VIRT_END
Date: Thu, 20 Feb 2020 16:38:12 +0100 [thread overview]
Message-ID: <0c84d313-6e7f-338b-723f-e76865a16798@suse.com> (raw)
In-Reply-To: <20200201003303.2363081-2-dwmw2@infradead.org>
On 01.02.2020 01:32, David Woodhouse wrote:
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
> @@ -1758,6 +1758,18 @@ int query_page_offline(mfn_t mfn, uint32_t *status)
> return 0;
> }
>
> +static unsigned long contig_avail_pages(struct page_info *pg, unsigned long max_pages)
> +{
> + unsigned long i;
> +
> + for ( i = 0 ; i < max_pages; i++)
Nit: Stray blank before first semicolon.
> + {
> + if ( pg[i].count_info & PGC_broken )
> + break;
> + }
> + return i;
Further nits: Commonly we omit the braces in cases like this one.
We also like to have blank lines before the main return statement
of a function.
> @@ -1846,6 +1863,63 @@ static unsigned long avail_heap_pages(
> return free_pages;
> }
>
> +static void mark_bad_pages(void)
__init please
> +{
> + unsigned long bad_spfn, bad_epfn;
> + const char *p;
> + struct page_info *pg;
> +#ifdef CONFIG_X86
> + const struct platform_bad_page *badpage;
> + unsigned int i, j, array_size;
> +
> + badpage = get_platform_badpages(&array_size);
> + if ( badpage )
> + {
> + for ( i = 0; i < array_size; i++ )
> + {
> + for ( j = 0; j < 1UL << badpage->order; j++ )
Either you mean badpage[i].* here and below, or you're missing an
increment of badpage somewhere.
> + {
> + if ( mfn_valid(_mfn(badpage->mfn + j)) )
> + {
> + pg = mfn_to_page(_mfn(badpage->mfn + j));
> + pg->count_info |= PGC_broken;
> + page_list_add_tail(pg, &page_broken_list);
> + }
> + }
> + }
> + }
> +#endif
> +
> + /* Check new pages against the bad-page list. */
> + p = opt_badpage;
> + while ( *p != '\0' )
> + {
> + bad_spfn = simple_strtoul(p, &p, 0);
> + bad_epfn = bad_spfn;
> +
> + if ( *p == '-' )
> + {
> + p++;
> + bad_epfn = simple_strtoul(p, &p, 0);
> + if ( bad_epfn < bad_spfn )
> + bad_epfn = bad_spfn;
> + }
> +
> + if ( *p == ',' )
> + p++;
> + else if ( *p != '\0' )
> + break;
I think this common (with init_boot_pages()) part of parsing
would better abstracted out, such there will be just one
instance of, and hence there's no risk of things going out of
sync.
> + while ( mfn_valid(_mfn(bad_spfn)) && bad_spfn < bad_epfn )
As per init_boot_pages() as well as per the "bad_epfn = bad_spfn;"
you have further up, the range here is inclusive at its end. I'm
also uncertain about the stopping at the first !mfn_valid() -
there may well be further valid pages later on.
Jan
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next prev parent reply other threads:[~2020-02-20 15:38 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-01 0:32 [Xen-devel] [PATCH 0/8] Early cleanups and bug fixes in preparation for live update David Woodhouse
2020-02-01 0:32 ` [Xen-devel] [PATCH 1/8] x86/smp: reset x2apic_enabled in smp_send_stop() David Woodhouse
2020-02-03 16:18 ` Roger Pau Monné
2020-02-01 0:32 ` [Xen-devel] [PATCH 2/8] x86/setup: Fix badpage= handling for memory above HYPERVISOR_VIRT_END David Woodhouse
2020-02-03 10:57 ` Julien Grall
2020-02-20 15:38 ` Jan Beulich [this message]
2020-03-06 22:52 ` Julien Grall
2020-02-01 0:32 ` [Xen-devel] [PATCH 3/8] x86/setup: Don't skip 2MiB underneath relocated Xen image David Woodhouse
2020-02-01 0:32 ` [Xen-devel] [PATCH 4/8] xen/vmap: allow vm_init_type to be called during early_boot David Woodhouse
2020-02-13 10:36 ` Julien Grall
2020-02-21 16:42 ` Jan Beulich
2020-02-01 0:33 ` [Xen-devel] [PATCH 5/8] xen/vmap: allow vmap() to be called during early boot David Woodhouse
2020-02-03 14:00 ` Julien Grall
2020-02-03 16:37 ` David Woodhouse
2020-02-04 11:00 ` George Dunlap
2020-02-04 11:06 ` David Woodhouse
2020-02-04 11:18 ` David Woodhouse
2020-02-09 18:19 ` Julien Grall
2020-02-21 16:46 ` Jan Beulich
2020-02-01 0:33 ` [Xen-devel] [PATCH 6/8] x86/setup: move vm_init() before end_boot_allocator() David Woodhouse
2020-02-03 11:10 ` Xia, Hongyan
2020-02-03 14:03 ` David Woodhouse
2020-02-21 16:48 ` Jan Beulich
2020-02-01 0:33 ` [Xen-devel] [PATCH 7/8] x86/setup: simplify handling of initrdidx when no initrd present David Woodhouse
2020-02-13 10:47 ` Julien Grall
2020-02-21 16:59 ` Jan Beulich
2020-02-24 13:31 ` Julien Grall
2020-02-25 12:34 ` Jan Beulich
2020-02-26 7:13 ` Julien Grall
2020-02-26 8:37 ` Jan Beulich
2020-02-01 0:33 ` [Xen-devel] [PATCH 8/8] x86/setup: lift dom0 creation out into create_dom0() function David Woodhouse
2020-02-03 14:28 ` Julien Grall
2020-02-03 15:03 ` David Woodhouse
2020-02-21 17:06 ` Jan Beulich
2020-03-17 23:45 ` David Woodhouse
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