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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v4 3/4] xen/arm: mm: Rename xenheap_* variable to directmap_*
With the static heap setup, keep using xenheap_* in the function
setup_xenheap_mappings() will make the code confusing to read,
because we always need to map the full RAM on Arm64. Therefore,
renaming all "xenheap_*" variables to "directmap_*" to make clear
the area is used to access the RAM easily.
On Arm32, only the xenheap is direct mapped today. So the renaming
to "directmap_*" would be still valid for Arm32.
No functional change is intended.
Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
---
Changes from v3 to v4:
- Also rename the setup_xenheap_mappings() function name and
printed messages inside the function.
- Update more comments.
Changes from v2 to v3:
- Adjust the order of this patch, make it #3.
Changes from v1 to v2:
- New commit.
---
xen/arch/arm/bootfdt.c | 2 +-
xen/arch/arm/include/asm/config.h | 2 +-
xen/arch/arm/include/asm/mm.h | 31 ++++++++++---------
xen/arch/arm/mm.c | 50 +++++++++++++++++--------------
xen/arch/arm/setup.c | 36 +++++++++++-----------
5 files changed, 64 insertions(+), 57 deletions(-)
diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index cb23fad571..a69f84aeb5 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -504,7 +504,7 @@ size_t __init boot_fdt_info(const void *fdt, paddr_t paddr)
device_tree_for_each_node((void *)fdt, 0, early_scan_node, NULL);
/*
- * On Arm64 setup_xenheap_mappings() expects to be called with the lowest
+ * On Arm64 setup_directmap_mappings() expects to be called with the lowest
* bank in memory first. There is no requirement that the DT will provide
* the banks sorted in ascending order. So sort them through.
*/
diff --git a/xen/arch/arm/include/asm/config.h
b/xen/arch/arm/include/asm/config.h
index 2fafb9f228..0fefed1b8a 100644
--- a/xen/arch/arm/include/asm/config.h
+++ b/xen/arch/arm/include/asm/config.h
@@ -160,7 +160,7 @@
#define DIRECTMAP_SIZE (SLOT0_ENTRY_SIZE * (265-256))
#define DIRECTMAP_VIRT_END (DIRECTMAP_VIRT_START + DIRECTMAP_SIZE - 1)
-#define XENHEAP_VIRT_START xenheap_virt_start
+#define XENHEAP_VIRT_START directmap_virt_start
#define HYPERVISOR_VIRT_END DIRECTMAP_VIRT_END
diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h
index 749fbefa0c..7d21120f98 100644
--- a/xen/arch/arm/include/asm/mm.h
+++ b/xen/arch/arm/include/asm/mm.h
@@ -154,19 +154,19 @@ struct page_info
#define _PGC_need_scrub _PGC_allocated
#define PGC_need_scrub PGC_allocated
-extern mfn_t xenheap_mfn_start, xenheap_mfn_end;
-extern vaddr_t xenheap_virt_end;
+extern mfn_t directmap_mfn_start, directmap_mfn_end;
+extern vaddr_t directmap_virt_end;
#ifdef CONFIG_ARM_64
-extern vaddr_t xenheap_virt_start;
-extern unsigned long xenheap_base_pdx;
+extern vaddr_t directmap_virt_start;
+extern unsigned long directmap_base_pdx;
#endif
#ifdef CONFIG_ARM_32
#define is_xen_heap_page(page) is_xen_heap_mfn(page_to_mfn(page))
#define is_xen_heap_mfn(mfn) ({ \
unsigned long mfn_ = mfn_x(mfn); \
- (mfn_ >= mfn_x(xenheap_mfn_start) && \
- mfn_ < mfn_x(xenheap_mfn_end)); \
+ (mfn_ >= mfn_x(directmap_mfn_start) && \
+ mfn_ < mfn_x(directmap_mfn_end)); \
})
#else
#define is_xen_heap_page(page) ((page)->count_info & PGC_xen_heap)
@@ -203,9 +203,12 @@ extern void remove_early_mappings(void);
extern int init_secondary_pagetables(int cpu);
/* Switch secondary CPUS to its own pagetables and finalise MMU setup */
extern void mmu_init_secondary_cpu(void);
-/* Set up the xenheap: up to 1GB of contiguous, always-mapped memory.
- * Base must be 32MB aligned and size a multiple of 32MB. */
-extern void setup_xenheap_mappings(unsigned long base_mfn, unsigned long
nr_mfns);
+/*
+ * For Arm32, set up the direct-mapped xenheap: up to 1GB of contiguous,
+ * always-mapped memory. Base must be 32MB aligned and size a multiple of 32MB.
+ * For Arm64, map the region in the directmap area.
+ */
+extern void setup_directmap_mappings(unsigned long base_mfn, unsigned long
nr_mfns);
/* Map a frame table to cover physical addresses ps through pe */
extern void setup_frametable_mappings(paddr_t ps, paddr_t pe);
/* map a physical range in virtual memory */
@@ -267,16 +270,16 @@ static inline paddr_t __virt_to_maddr(vaddr_t va)
static inline void *maddr_to_virt(paddr_t ma)
{
ASSERT(is_xen_heap_mfn(maddr_to_mfn(ma)));
- ma -= mfn_to_maddr(xenheap_mfn_start);
+ ma -= mfn_to_maddr(directmap_mfn_start);
return (void *)(unsigned long) ma + XENHEAP_VIRT_START;
}
#else
static inline void *maddr_to_virt(paddr_t ma)
{
- ASSERT((mfn_to_pdx(maddr_to_mfn(ma)) - xenheap_base_pdx) <
+ ASSERT((mfn_to_pdx(maddr_to_mfn(ma)) - directmap_base_pdx) <
(DIRECTMAP_SIZE >> PAGE_SHIFT));
return (void *)(XENHEAP_VIRT_START -
- (xenheap_base_pdx << PAGE_SHIFT) +
+ (directmap_base_pdx << PAGE_SHIFT) +
((ma & ma_va_bottom_mask) |
((ma & ma_top_mask) >> pfn_pdx_hole_shift)));
}
@@ -319,10 +322,10 @@ static inline struct page_info *virt_to_page(const void
*v)
unsigned long pdx;
ASSERT(va >= XENHEAP_VIRT_START);
- ASSERT(va < xenheap_virt_end);
+ ASSERT(va < directmap_virt_end);
pdx = (va - XENHEAP_VIRT_START) >> PAGE_SHIFT;
- pdx += mfn_to_pdx(xenheap_mfn_start);
+ pdx += mfn_to_pdx(directmap_mfn_start);
return frame_table + pdx - frametable_base_pdx;
}
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 7f5b317d3e..11ee49598b 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -132,12 +132,12 @@ uint64_t init_ttbr;
static paddr_t phys_offset;
/* Limits of the Xen heap */
-mfn_t xenheap_mfn_start __read_mostly = INVALID_MFN_INITIALIZER;
-mfn_t xenheap_mfn_end __read_mostly;
-vaddr_t xenheap_virt_end __read_mostly;
+mfn_t directmap_mfn_start __read_mostly = INVALID_MFN_INITIALIZER;
+mfn_t directmap_mfn_end __read_mostly;
+vaddr_t directmap_virt_end __read_mostly;
#ifdef CONFIG_ARM_64
-vaddr_t xenheap_virt_start __read_mostly;
-unsigned long xenheap_base_pdx __read_mostly;
+vaddr_t directmap_virt_start __read_mostly;
+unsigned long directmap_base_pdx __read_mostly;
#endif
unsigned long frametable_base_pdx __read_mostly;
@@ -597,55 +597,59 @@ void mmu_init_secondary_cpu(void)
}
#ifdef CONFIG_ARM_32
-/* Set up the xenheap: up to 1GB of contiguous, always-mapped memory. */
-void __init setup_xenheap_mappings(unsigned long base_mfn,
- unsigned long nr_mfns)
+/*
+ * Set up the direct-mapped xenheap:
+ * up to 1GB of contiguous, always-mapped memory.
+ */
+void __init setup_directmap_mappings(unsigned long base_mfn,
+ unsigned long nr_mfns)
{
int rc;
rc = map_pages_to_xen(XENHEAP_VIRT_START, _mfn(base_mfn), nr_mfns,
PAGE_HYPERVISOR_RW | _PAGE_BLOCK);
if ( rc )
- panic("Unable to setup the xenheap mappings.\n");
+ panic("Unable to setup the directmap mappings.\n");
- /* Record where the xenheap is, for translation routines. */
- xenheap_virt_end = XENHEAP_VIRT_START + nr_mfns * PAGE_SIZE;
+ /* Record where the directmap is, for translation routines. */
+ directmap_virt_end = XENHEAP_VIRT_START + nr_mfns * PAGE_SIZE;
}
#else /* CONFIG_ARM_64 */
-void __init setup_xenheap_mappings(unsigned long base_mfn,
- unsigned long nr_mfns)
+/* Map the region in the directmap area. */
+void __init setup_directmap_mappings(unsigned long base_mfn,
+ unsigned long nr_mfns)
{
int rc;
- /* First call sets the xenheap physical and virtual offset. */
- if ( mfn_eq(xenheap_mfn_start, INVALID_MFN) )
+ /* First call sets the directmap physical and virtual offset. */
+ if ( mfn_eq(directmap_mfn_start, INVALID_MFN) )
{
unsigned long mfn_gb = base_mfn & ~((FIRST_SIZE >> PAGE_SHIFT) - 1);
- xenheap_mfn_start = _mfn(base_mfn);
- xenheap_base_pdx = mfn_to_pdx(_mfn(base_mfn));
+ directmap_mfn_start = _mfn(base_mfn);
+ directmap_base_pdx = mfn_to_pdx(_mfn(base_mfn));
/*
* The base address may not be aligned to the first level
* size (e.g. 1GB when using 4KB pages). This would prevent
* superpage mappings for all the regions because the virtual
* address and machine address should both be suitably aligned.
*
- * Prevent that by offsetting the start of the xenheap virtual
+ * Prevent that by offsetting the start of the directmap virtual
* address.
*/
- xenheap_virt_start = DIRECTMAP_VIRT_START +
+ directmap_virt_start = DIRECTMAP_VIRT_START +
(base_mfn - mfn_gb) * PAGE_SIZE;
}
- if ( base_mfn < mfn_x(xenheap_mfn_start) )
- panic("cannot add xenheap mapping at %lx below heap start %lx\n",
- base_mfn, mfn_x(xenheap_mfn_start));
+ if ( base_mfn < mfn_x(directmap_mfn_start) )
+ panic("cannot add directmap mapping at %lx below heap start %lx\n",
+ base_mfn, mfn_x(directmap_mfn_start));
rc = map_pages_to_xen((vaddr_t)__mfn_to_virt(base_mfn),
_mfn(base_mfn), nr_mfns,
PAGE_HYPERVISOR_RW | _PAGE_BLOCK);
if ( rc )
- panic("Unable to setup the xenheap mappings.\n");
+ panic("Unable to setup the directmap mappings.\n");
}
#endif
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 3c36c050bf..9f3838d004 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -697,11 +697,11 @@ static void __init populate_boot_allocator(void)
#ifdef CONFIG_ARM_32
/* Avoid the xenheap */
- if ( s < mfn_to_maddr(xenheap_mfn_end) &&
- mfn_to_maddr(xenheap_mfn_start) < e )
+ if ( s < mfn_to_maddr(directmap_mfn_end) &&
+ mfn_to_maddr(directmap_mfn_start) < e )
{
- e = mfn_to_maddr(xenheap_mfn_start);
- n = mfn_to_maddr(xenheap_mfn_end);
+ e = mfn_to_maddr(directmap_mfn_start);
+ n = mfn_to_maddr(directmap_mfn_end);
}
#endif
@@ -791,17 +791,17 @@ static void __init setup_mm(void)
/*
* We need some memory to allocate the page-tables used for the
- * xenheap mappings. So populate the boot allocator first.
+ * directmap mappings. So populate the boot allocator first.
*
- * This requires us to set xenheap_mfn_{start, end} first so the Xenheap
- * region can be avoided.
+ * This requires us to set directmap_mfn_{start, end} first so the
+ * direct-mapped Xenheap region can be avoided.
*/
- xenheap_mfn_start = _mfn((e >> PAGE_SHIFT) - xenheap_pages);
- xenheap_mfn_end = mfn_add(xenheap_mfn_start, xenheap_pages);
+ directmap_mfn_start = _mfn((e >> PAGE_SHIFT) - xenheap_pages);
+ directmap_mfn_end = mfn_add(directmap_mfn_start, xenheap_pages);
populate_boot_allocator();
- setup_xenheap_mappings(mfn_x(xenheap_mfn_start), xenheap_pages);
+ setup_directmap_mappings(mfn_x(directmap_mfn_start), xenheap_pages);
/* Frame table covers all of RAM region, including holes */
setup_frametable_mappings(ram_start, ram_end);
@@ -816,8 +816,8 @@ static void __init setup_mm(void)
smp_processor_id());
/* Add xenheap memory that was not already added to the boot allocator. */
- init_xenheap_pages(mfn_to_maddr(xenheap_mfn_start),
- mfn_to_maddr(xenheap_mfn_end));
+ init_xenheap_pages(mfn_to_maddr(directmap_mfn_start),
+ mfn_to_maddr(directmap_mfn_end));
init_staticmem_pages();
}
@@ -833,7 +833,7 @@ static void __init setup_mm(void)
init_pdx();
/*
- * We need some memory to allocate the page-tables used for the xenheap
+ * We need some memory to allocate the page-tables used for the directmap
* mappings. But some regions may contain memory already allocated
* for other uses (e.g. modules, reserved-memory...).
*
@@ -852,15 +852,15 @@ static void __init setup_mm(void)
ram_start = min(ram_start, bank->start);
ram_end = max(ram_end, bank_end);
- setup_xenheap_mappings(PFN_DOWN(bank->start),
- PFN_DOWN(bank->size));
+ setup_directmap_mappings(PFN_DOWN(bank->start),
+ PFN_DOWN(bank->size));
}
total_pages += ram_size >> PAGE_SHIFT;
- xenheap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start;
- xenheap_mfn_start = maddr_to_mfn(ram_start);
- xenheap_mfn_end = maddr_to_mfn(ram_end);
+ directmap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start;
+ directmap_mfn_start = maddr_to_mfn(ram_start);
+ directmap_mfn_end = maddr_to_mfn(ram_end);
setup_frametable_mappings(ram_start, ram_end);
max_page = PFN_DOWN(ram_end);
--
2.17.1
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