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From: Julien Grall <julien@xen.org>
To: xen-devel@lists.xenproject.org
Cc: alex.bennee@linaro.org, masami.hiramatsu@linaro.org,
	ehem+xen@m5p.com, bertrand.marquis@arm.com,
	andre.przywara@arm.com, Julien Grall <jgrall@amazon.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: [PATCH 4/4] xen/arm: Introduce fw_unreserved_regions() and use it
Date: Sat, 26 Sep 2020 21:55:42 +0100
Message-ID: <20200926205542.9261-5-julien@xen.org> (raw)
In-Reply-To: <20200926205542.9261-1-julien@xen.org>

From: Julien Grall <jgrall@amazon.com>

Since commit 6e3e77120378 "xen/arm: setup: Relocate the Device-Tree
later on in the boot", the device-tree will not be kept mapped when
using ACPI.

However, a few places are calling dt_unreserved_regions() which expects
a valid DT. This will lead to a crash.

As the DT should not be used for ACPI (other than for detecting the
modules), a new function fw_unreserved_regions() is introduced.

It will behave the same way on DT system. On ACPI system, it will
unreserve the whole region.

Signed-off-by: Julien Grall <jgrall@amazon.com>

---

Is there any region we should exclude on ACPI?
---
 xen/arch/arm/kernel.c       |  2 +-
 xen/arch/arm/setup.c        | 22 +++++++++++++++++-----
 xen/include/asm-arm/setup.h |  2 +-
 3 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c
index 032923853f2c..ab78689ed2a6 100644
--- a/xen/arch/arm/kernel.c
+++ b/xen/arch/arm/kernel.c
@@ -307,7 +307,7 @@ static __init int kernel_decompress(struct bootmodule *mod)
      * Free the original kernel, update the pointers to the
      * decompressed kernel
      */
-    dt_unreserved_regions(addr, addr + size, init_domheap_pages, 0);
+    fw_unreserved_regions(addr, addr + size, init_domheap_pages, 0);
 
     return 0;
 }
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 35e5bee04efa..7fcff9af2a7e 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -196,8 +196,9 @@ static void __init processor_id(void)
     processor_setup();
 }
 
-void __init dt_unreserved_regions(paddr_t s, paddr_t e,
-                                  void (*cb)(paddr_t, paddr_t), int first)
+static void __init dt_unreserved_regions(paddr_t s, paddr_t e,
+                                         void (*cb)(paddr_t, paddr_t),
+                                         int first)
 {
     int i, nr = fdt_num_mem_rsv(device_tree_flattened);
 
@@ -244,6 +245,17 @@ void __init dt_unreserved_regions(paddr_t s, paddr_t e,
     cb(s, e);
 }
 
+void __init fw_unreserved_regions(paddr_t s, paddr_t e,
+                                  void (*cb)(paddr_t, paddr_t), int first)
+{
+    if ( acpi_disabled )
+        dt_unreserved_regions(s, e, cb, first);
+    else
+        cb(s, e);
+}
+
+
+
 struct bootmodule __init *add_boot_module(bootmodule_kind kind,
                                           paddr_t start, paddr_t size,
                                           bool domU)
@@ -405,7 +417,7 @@ void __init discard_initial_modules(void)
              !mfn_valid(maddr_to_mfn(e)) )
             continue;
 
-        dt_unreserved_regions(s, e, init_domheap_pages, 0);
+        fw_unreserved_regions(s, e, init_domheap_pages, 0);
     }
 
     mi->nr_mods = 0;
@@ -712,7 +724,7 @@ static void __init setup_mm(void)
                 n = mfn_to_maddr(mfn_add(xenheap_mfn_start, xenheap_pages));
             }
 
-            dt_unreserved_regions(s, e, init_boot_pages, 0);
+            fw_unreserved_regions(s, e, init_boot_pages, 0);
 
             s = n;
         }
@@ -765,7 +777,7 @@ static void __init setup_mm(void)
             if ( e > bank_end )
                 e = bank_end;
 
-            dt_unreserved_regions(s, e, init_boot_pages, 0);
+            fw_unreserved_regions(s, e, init_boot_pages, 0);
             s = n;
         }
     }
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index 2f8f24e286ed..34df23247b87 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -96,7 +96,7 @@ int construct_dom0(struct domain *d);
 void create_domUs(void);
 
 void discard_initial_modules(void);
-void dt_unreserved_regions(paddr_t s, paddr_t e,
+void fw_unreserved_regions(paddr_t s, paddr_t e,
                            void (*cb)(paddr_t, paddr_t), int first);
 
 size_t boot_fdt_info(const void *fdt, paddr_t paddr);
-- 
2.17.1



  parent reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-26 20:55 [PATCH 0/4] xen/arm: Unbreak ACPI Julien Grall
2020-09-26 20:55 ` [PATCH 1/4] xen/acpi: Rework acpi_os_map_memory() and acpi_os_unmap_memory() Julien Grall
2020-09-28  8:18   ` Jan Beulich
2020-09-28  9:58     ` Julien Grall
2020-09-28 10:09       ` Jan Beulich
2020-09-28 10:39         ` Julien Grall
2020-10-10  9:49           ` Julien Grall
2020-10-10 10:04             ` Julien Grall
2020-09-29 11:10   ` Rahul Singh
2020-10-01  0:06   ` Stefano Stabellini
2020-10-01 15:09     ` Julien Grall
2020-09-26 20:55 ` [PATCH 2/4] xen/arm: acpi: The fixmap area should always be cleared during failure/unmap Julien Grall
2020-09-29 11:13   ` Rahul Singh
2020-10-01  0:30   ` Stefano Stabellini
2020-10-01 15:14     ` Julien Grall
2020-09-26 20:55 ` [PATCH 3/4] xen/arm: Check if the platform is not using ACPI before initializing Dom0less Julien Grall
2020-09-29 11:17   ` Rahul Singh
2020-09-30 23:26   ` Stefano Stabellini
2020-09-26 20:55 ` Julien Grall [this message]
2020-09-30 23:40   ` [PATCH 4/4] xen/arm: Introduce fw_unreserved_regions() and use it Stefano Stabellini
2020-10-01 15:34     ` Julien Grall
2020-09-27  1:47 ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-09-29 15:28   ` Elliott Mitchell
2020-09-28  6:47 ` Masami Hiramatsu
2020-09-28 13:00   ` Masami Hiramatsu
2020-10-16 22:33     ` Xen-ARM EFI/ACPI problems (was: Re: [PATCH 0/4] xen/arm: Unbreak ACPI) Elliott Mitchell
2020-10-17  5:12       ` Elliott Mitchell
2020-10-08 18:39   ` [PATCH 0/4] xen/arm: Unbreak ACPI Elliott Mitchell
2020-10-09  9:39     ` Julien Grall
2020-10-09 14:22       ` Elliott Mitchell
2020-10-09 18:15         ` Julien Grall
2020-10-09 22:36           ` Elliott Mitchell
2020-10-09 21:49   ` Elliott Mitchell
2020-10-10 11:02   ` Julien Grall
2020-10-12 19:02     ` Stefano Stabellini
2020-10-12 21:34       ` Elliott Mitchell
2020-10-14  1:06         ` Stefano Stabellini
2020-10-14  1:37           ` Elliott Mitchell
2020-10-14 17:47             ` Julien Grall
2020-10-15 18:00               ` Stefano Stabellini
2020-10-14 17:44       ` Julien Grall
2020-09-29 11:10 ` Rahul Singh
2020-09-29 15:29 ` Alex Bennée
2020-09-29 17:07   ` Julien Grall
2020-09-29 21:11     ` Alex Bennée
2020-09-29 23:39       ` André Przywara
2020-09-30  8:51         ` Alex Bennée
2020-09-30 10:35         ` Julien Grall
2020-09-30  9:42       ` Julien Grall
2020-09-30 10:38         ` Alex Bennée
2020-09-30 11:10           ` Julien Grall

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