From: Juergen Gross <jgross@suse.com> To: xen-devel@lists.xensource.com, konrad.wilk@oracle.com, david.vrabel@citrix.com, boris.ostrovsky@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Juergen Gross <jgross@suse.com> Subject: [RESEND Patch V3 07/15] xen: check memory area against e820 map Date: Mon, 4 May 2015 10:23:07 +0200 [thread overview] Message-ID: <1430727795-25133-8-git-send-email-jgross@suse.com> (raw) In-Reply-To: <1430727795-25133-1-git-send-email-jgross@suse.com> Provide a service routine to check a physical memory area against the E820 map. The routine will return false if the complete area is RAM according to the E820 map and true otherwise. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> --- arch/x86/xen/setup.c | 23 +++++++++++++++++++++++ arch/x86/xen/xen-ops.h | 1 + 2 files changed, 24 insertions(+) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 87251b4..99ef82c 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -573,6 +573,29 @@ static unsigned long __init xen_count_remap_pages(unsigned long max_pfn) return extra; } +bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size) +{ + struct e820entry *entry; + unsigned mapcnt; + phys_addr_t end; + + if (!size) + return false; + + end = start + size; + entry = xen_e820_map; + + for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++) { + if (entry->type == E820_RAM && entry->addr <= start && + (entry->addr + entry->size) >= end) + return false; + + entry++; + } + + return true; +} + /* * Reserve Xen mfn_list. * See comment above "struct start_info" in <xen/interface/xen.h> diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 9e195c6..c1385b8 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -39,6 +39,7 @@ void xen_reserve_top(void); void xen_mm_pin_all(void); void xen_mm_unpin_all(void); +bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size); unsigned long __ref xen_chk_extra_mem(unsigned long pfn); void __init xen_inv_extra_mem(void); void __init xen_remap_memory(void); -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: Juergen Gross <jgross@suse.com> To: xen-devel@lists.xensource.com, konrad.wilk@oracle.com, david.vrabel@citrix.com, boris.ostrovsky@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Juergen Gross <jgross@suse.com> Subject: [RESEND Patch V3 07/15] xen: check memory area against e820 map Date: Mon, 4 May 2015 10:23:07 +0200 [thread overview] Message-ID: <1430727795-25133-8-git-send-email-jgross@suse.com> (raw) In-Reply-To: <1430727795-25133-1-git-send-email-jgross@suse.com> Provide a service routine to check a physical memory area against the E820 map. The routine will return false if the complete area is RAM according to the E820 map and true otherwise. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> --- arch/x86/xen/setup.c | 23 +++++++++++++++++++++++ arch/x86/xen/xen-ops.h | 1 + 2 files changed, 24 insertions(+) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 87251b4..99ef82c 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -573,6 +573,29 @@ static unsigned long __init xen_count_remap_pages(unsigned long max_pfn) return extra; } +bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size) +{ + struct e820entry *entry; + unsigned mapcnt; + phys_addr_t end; + + if (!size) + return false; + + end = start + size; + entry = xen_e820_map; + + for (mapcnt = 0; mapcnt < xen_e820_map_entries; mapcnt++) { + if (entry->type == E820_RAM && entry->addr <= start && + (entry->addr + entry->size) >= end) + return false; + + entry++; + } + + return true; +} + /* * Reserve Xen mfn_list. * See comment above "struct start_info" in <xen/interface/xen.h> diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 9e195c6..c1385b8 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -39,6 +39,7 @@ void xen_reserve_top(void); void xen_mm_pin_all(void); void xen_mm_unpin_all(void); +bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size); unsigned long __ref xen_chk_extra_mem(unsigned long pfn); void __init xen_inv_extra_mem(void); void __init xen_remap_memory(void); -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-05-04 8:25 UTC|newest] Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-05-04 8:23 [RESEND Patch V3 00/15] xen: support pv-domains larger than 512GB Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 01/15] xen: sync with xen headers Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 02/15] xen: save linear p2m list address in shared info structure Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 03/15] xen: don't build mfn tree if tools don't need it Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 04/15] xen: eliminate scalability issues from initial mapping setup Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 05/15] xen: move static e820 map to global scope Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 06/15] xen: split counting of extra memory pages from remapping Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` Juergen Gross [this message] 2015-05-04 8:23 ` [RESEND Patch V3 07/15] xen: check memory area against e820 map Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 08/15] xen: find unused contiguous memory area Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 09/15] xen: check for kernel memory conflicting with memory layout Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 10/15] xen: check pre-allocated page tables for conflict with memory map Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 11/15] xen: check for initrd conflicting with e820 map Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 12/15] mm: provide early_memremap_ro to establish read-only mapping Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 13/15] xen: move p2m list if conflicting with e820 map Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 14/15] xen: allow more than 512 GB of RAM for 64 bit pv-domains Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-04 8:23 ` [RESEND Patch V3 15/15] xen: remove no longer needed p2m.h Juergen Gross 2015-05-04 8:23 ` Juergen Gross 2015-05-15 12:17 ` [RESEND Patch V3 00/15] xen: support pv-domains larger than 512GB Juergen Gross 2015-05-15 12:17 ` Juergen Gross -- strict thread matches above, loose matches on Subject: below -- 2015-05-04 6:18 Juergen Gross 2015-05-04 6:18 ` [RESEND Patch V3 07/15] xen: check memory area against e820 map Juergen Gross
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