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Re: [PATCH v6 09/13] xen/arm: Extract MMU-specific MM code
- To: Henry Wang <Henry.Wang@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Ayan Kumar Halder <ayankuma@xxxxxxx>
- Date: Thu, 7 Sep 2023 12:34:42 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Wei Chen <wei.chen@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Penny Zheng <penny.zheng@xxxxxxx>
- Delivery-date: Thu, 07 Sep 2023 11:35:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Henry,
On 28/08/2023 02:32, Henry Wang wrote:
CAUTION: This message has originated from an External Source. Please use proper
judgment and caution when opening attachments, clicking links, or responding to
this email.
Currently, most of the code is in arm/mm.{c,h} and arm/arm64/mm.c
is MMU-specific. To make the MM code extendable, this commit extracts
the MMU-specific MM code.
Extract the boot CPU MM bringup code from arm/mm.c to mmu/setup.c.
Move arm/arm64/mm.c to arm/arm64/mmu/mm.c. Since the function
setup_directmap_mappings() has different implementations between
arm32 and arm64, move their arch-specific implementation to
arch-specific arm{32,64}/mmu/mm.c instead using #ifdef again.
For header files, move MMU-related function declarations in
asm/mm.h and the declaration of dump_pt_walk() in asm/page.h to
asm/mmu/mm.h
Also modify the build system (Makefiles in this case) to pick above
mentioned code changes.
Take the opportunity to fix the in-code comment coding styles when
possible, and drop the unnecessary #include headers in the original
arm/mm.c.
Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
---
v6:
- Rework the original patch
"[v5,07/13] xen/arm: Extract MMU-specific code"
---
xen/arch/arm/arm32/Makefile | 1 +
xen/arch/arm/arm32/mmu/Makefile | 1 +
xen/arch/arm/arm32/mmu/mm.c | 31 +++
xen/arch/arm/arm64/Makefile | 1 -
xen/arch/arm/arm64/mmu/Makefile | 1 +
xen/arch/arm/arm64/{ => mmu}/mm.c | 37 +++
xen/arch/arm/include/asm/mm.h | 22 +-
xen/arch/arm/include/asm/mmu/mm.h | 47 ++++
xen/arch/arm/include/asm/page.h | 15 --
xen/arch/arm/mm.c | 381 ------------------------------
xen/arch/arm/mmu/Makefile | 1 +
xen/arch/arm/mmu/setup.c | 345 +++++++++++++++++++++++++++
12 files changed, 470 insertions(+), 413 deletions(-)
create mode 100644 xen/arch/arm/arm32/mmu/Makefile
create mode 100644 xen/arch/arm/arm32/mmu/mm.c
rename xen/arch/arm/arm64/{ => mmu}/mm.c (75%)
create mode 100644 xen/arch/arm/include/asm/mmu/mm.h
create mode 100644 xen/arch/arm/mmu/setup.c
diff --git a/xen/arch/arm/arm32/Makefile b/xen/arch/arm/arm32/Makefile
index 520fb42054..40a2b4803f 100644
--- a/xen/arch/arm/arm32/Makefile
+++ b/xen/arch/arm/arm32/Makefile
@@ -1,4 +1,5 @@
obj-y += lib/
+obj-$(CONFIG_MMU) += mmu/
obj-$(CONFIG_EARLY_PRINTK) += debug.o
obj-y += domctl.o
diff --git a/xen/arch/arm/arm32/mmu/Makefile b/xen/arch/arm/arm32/mmu/Makefile
new file mode 100644
index 0000000000..b18cec4836
--- /dev/null
+++ b/xen/arch/arm/arm32/mmu/Makefile
@@ -0,0 +1 @@
+obj-y += mm.o
diff --git a/xen/arch/arm/arm32/mmu/mm.c b/xen/arch/arm/arm32/mmu/mm.c
new file mode 100644
index 0000000000..647baf4a81
--- /dev/null
+++ b/xen/arch/arm/arm32/mmu/mm.c
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <xen/init.h>
+#include <asm/fixmap.h>
+
+/*
+ * 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 directmap mappings.\n");
+
+ /* Record where the directmap is, for translation routines. */
+ directmap_virt_end = XENHEAP_VIRT_START + nr_mfns * PAGE_SIZE;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/arm64/Makefile b/xen/arch/arm/arm64/Makefile
index f89d5fb4fb..72161ff22e 100644
--- a/xen/arch/arm/arm64/Makefile
+++ b/xen/arch/arm/arm64/Makefile
@@ -11,7 +11,6 @@ obj-y += entry.o
obj-y += head.o
obj-y += insn.o
obj-$(CONFIG_LIVEPATCH) += livepatch.o
-obj-y += mm.o
obj-y += smc.o
obj-y += smpboot.o
obj-$(CONFIG_ARM64_SVE) += sve.o sve-asm.o
diff --git a/xen/arch/arm/arm64/mmu/Makefile b/xen/arch/arm/arm64/mmu/Makefile
index 3340058c08..a8a750a3d0 100644
--- a/xen/arch/arm/arm64/mmu/Makefile
+++ b/xen/arch/arm/arm64/mmu/Makefile
@@ -1 +1,2 @@
obj-y += head.o
+obj-y += mm.o
diff --git a/xen/arch/arm/arm64/mm.c b/xen/arch/arm/arm64/mmu/mm.c
similarity index 75%
rename from xen/arch/arm/arm64/mm.c
rename to xen/arch/arm/arm64/mmu/mm.c
index 78b7c7eb00..36073041ed 100644
--- a/xen/arch/arm/arm64/mm.c
+++ b/xen/arch/arm/arm64/mmu/mm.c
@@ -151,6 +151,43 @@ void __init switch_ttbr(uint64_t ttbr)
update_identity_mapping(false);
}
+/* 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 directmap physical and virtual offset. */
+ if ( mfn_eq(directmap_mfn_start, INVALID_MFN) )
+ {
+ unsigned long mfn_gb = base_mfn & ~((FIRST_SIZE >> PAGE_SHIFT) - 1);
+
+ 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 directmap virtual
+ * address.
+ */
+ directmap_virt_start = DIRECTMAP_VIRT_START +
+ (base_mfn - mfn_gb) * PAGE_SIZE;
+ }
+
+ 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 directmap mappings.\n");
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h
index a66aa219b1..ded6d076c5 100644
--- a/xen/arch/arm/include/asm/mm.h
+++ b/xen/arch/arm/include/asm/mm.h
@@ -14,6 +14,12 @@
# error "unknown ARM variant"
#endif
+#if defined(CONFIG_MMU)
+# include <asm/mmu/mm.h>
+#else
+# error "Unknown memory management layout"
+#endif
+
/* Align Xen to a 2 MiB boundary. */
#define XEN_PADDR_ALIGN (1 << 21)
@@ -170,13 +176,6 @@ extern uint64_t init_ttbr;
extern paddr_t phys_offset;
-extern mfn_t directmap_mfn_start, directmap_mfn_end;
-extern vaddr_t directmap_virt_end;
-#ifdef CONFIG_ARM_64
-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) ({ \
@@ -199,7 +198,6 @@ extern unsigned long directmap_base_pdx;
#define maddr_get_owner(ma) (page_get_owner(maddr_to_page((ma))))
-#define frame_table ((struct page_info *)FRAMETABLE_VIRT_START)
/* PDX of the first page in the frame table. */
extern unsigned long frametable_base_pdx;
@@ -209,19 +207,11 @@ extern unsigned long frametable_base_pdx;
extern void setup_pagetables(unsigned long boot_phys_offset);
/* Map FDT in boot pagetable */
extern void *early_fdt_map(paddr_t fdt_paddr);
-/* Switch to a new root page-tables */
-extern void switch_ttbr(uint64_t ttbr);
/* Remove early mappings */
extern void remove_early_mappings(void);
/* Allocate and initialise pagetables for a secondary CPU. Sets init_ttbr to
the
* new page table */
extern int init_secondary_pagetables(int cpu);
-/*
- * 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 */
diff --git a/xen/arch/arm/include/asm/mmu/mm.h
b/xen/arch/arm/include/asm/mmu/mm.h
new file mode 100644
index 0000000000..5e3b14519b
--- /dev/null
+++ b/xen/arch/arm/include/asm/mmu/mm.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __ARM_MMU_MM_H__
+#define __ARM_MMU_MM_H__
+
+extern mfn_t directmap_mfn_start, directmap_mfn_end;
As you are declaring them for MMU specific , you also need this change :-
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 89ecb54be2..19b60c5d1b 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -670,7 +670,7 @@ void __init populate_boot_allocator(void)
s = bootinfo.reserved_mem.bank[i].start;
e = s + bootinfo.reserved_mem.bank[i].size;
-#ifdef CONFIG_ARM_32
+#if (CONFIG_ARM_32 && CONFIG_MMU)
/* Avoid the xenheap, note that the xenheap cannot across
a bank */
if ( s <= mfn_to_maddr(directmap_mfn_start) &&
e >= mfn_to_maddr(directmap_mfn_end) )
@@ -708,7 +708,7 @@ void __init populate_boot_allocator(void)
if ( e > bank_end )
e = bank_end;
-#ifdef CONFIG_ARM_32
+#if (CONFIG_ARM_32 && CONFIG_MMU)
/* Avoid the xenheap */
if ( s < mfn_to_maddr(directmap_mfn_end) &&
mfn_to_maddr(directmap_mfn_start) < e )
So that directmap_mfn_end and directmap_mfn_start is used only when MMU
is enabled.
- Ayan
+extern vaddr_t directmap_virt_end;
+#ifdef CONFIG_ARM_64
+extern vaddr_t directmap_virt_start;
+extern unsigned long directmap_base_pdx;
+#endif
+
+#define frame_table ((struct page_info *)FRAMETABLE_VIRT_START)
+
+/*
+ * Print a walk of a page table or p2m
+ *
+ * ttbr is the base address register (TTBR0_EL2 or VTTBR_EL2)
+ * addr is the PA or IPA to translate
+ * root_level is the starting level of the page table
+ * (e.g. TCR_EL2.SL0 or VTCR_EL2.SL0 )
+ * nr_root_tables is the number of concatenated tables at the root.
+ * this can only be != 1 for P2M walks starting at the first or
+ * subsequent level.
+ */
+void dump_pt_walk(paddr_t ttbr, paddr_t addr,
+ unsigned int root_level,
+ unsigned int nr_root_tables);
+
+/* Switch to a new root page-tables */
+extern void switch_ttbr(uint64_t ttbr);
+/*
+ * 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);
+
+#endif /* __ARM_MMU_MM_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/include/asm/page.h b/xen/arch/arm/include/asm/page.h
index 657c4b33db..ac65f0277a 100644
--- a/xen/arch/arm/include/asm/page.h
+++ b/xen/arch/arm/include/asm/page.h
@@ -257,21 +257,6 @@ static inline void write_pte(lpae_t *p, lpae_t pte)
/* Flush the dcache for an entire page. */
void flush_page_to_ram(unsigned long mfn, bool sync_icache);
-/*
- * Print a walk of a page table or p2m
- *
- * ttbr is the base address register (TTBR0_EL2 or VTTBR_EL2)
- * addr is the PA or IPA to translate
- * root_level is the starting level of the page table
- * (e.g. TCR_EL2.SL0 or VTCR_EL2.SL0 )
- * nr_root_tables is the number of concatenated tables at the root.
- * this can only be != 1 for P2M walks starting at the first or
- * subsequent level.
- */
-void dump_pt_walk(paddr_t ttbr, paddr_t addr,
- unsigned int root_level,
- unsigned int nr_root_tables);
-
/* Print a walk of the hypervisor's page tables for a virtual addr. */
extern void dump_hyp_walk(vaddr_t addr);
/* Print a walk of the p2m for a domain for a physical address. */
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 3ee74542ba..eeb65ca6bb 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -11,139 +11,19 @@
#include <xen/domain_page.h>
#include <xen/grant_table.h>
#include <xen/guest_access.h>
-#include <xen/libfdt/libfdt.h>
#include <xen/mm.h>
-#include <xen/sizes.h>
#include <xsm/xsm.h>
-#include <asm/setup.h>
-
#include <public/memory.h>
/* Override macros from asm/page.h to make them work with mfn_t */
#undef virt_to_mfn
#define virt_to_mfn(va) _mfn(__virt_to_mfn(va))
-#undef mfn_to_virt
-#define mfn_to_virt(mfn) __mfn_to_virt(mfn_x(mfn))
-
-/* Main runtime page tables */
-
-/*
- * For arm32 xen_pgtable are per-PCPU and are allocated before
- * bringing up each CPU. For arm64 xen_pgtable is common to all PCPUs.
- *
- * xen_second, xen_fixmap and xen_xenmap are always shared between all
- * PCPUs.
- */
-
-#ifdef CONFIG_ARM_64
-DEFINE_PAGE_TABLE(xen_pgtable);
-static DEFINE_PAGE_TABLE(xen_first);
-#define THIS_CPU_PGTABLE xen_pgtable
-#else
-/* Per-CPU pagetable pages */
-/* xen_pgtable == root of the trie (zeroeth level on 64-bit, first on 32-bit)
*/
-DEFINE_PER_CPU(lpae_t *, xen_pgtable);
-#define THIS_CPU_PGTABLE this_cpu(xen_pgtable)
-/* Root of the trie for cpu0, other CPU's PTs are dynamically allocated */
-DEFINE_PAGE_TABLE(cpu0_pgtable);
-#endif
-
-/* Common pagetable leaves */
-/* Second level page table used to cover Xen virtual address space */
-static DEFINE_PAGE_TABLE(xen_second);
-/* Third level page table used for fixmap */
-DEFINE_BOOT_PAGE_TABLE(xen_fixmap);
-/*
- * Third level page table used to map Xen itself with the XN bit set
- * as appropriate.
- */
-static DEFINE_PAGE_TABLES(xen_xenmap, XEN_NR_ENTRIES(2));
-
-/* Non-boot CPUs use this to find the correct pagetables. */
-uint64_t init_ttbr;
-
-paddr_t phys_offset;
-
-/* Limits of the Xen heap */
-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 directmap_virt_start __read_mostly;
-unsigned long directmap_base_pdx __read_mostly;
-#endif
unsigned long frametable_base_pdx __read_mostly;
unsigned long frametable_virt_end __read_mostly;
-extern char __init_begin[], __init_end[];
-
-/* Checking VA memory layout alignment. */
-static void __init __maybe_unused build_assertions(void)
-{
- /* 2MB aligned regions */
- BUILD_BUG_ON(XEN_VIRT_START & ~SECOND_MASK);
- BUILD_BUG_ON(FIXMAP_ADDR(0) & ~SECOND_MASK);
- /* 1GB aligned regions */
-#ifdef CONFIG_ARM_32
- BUILD_BUG_ON(XENHEAP_VIRT_START & ~FIRST_MASK);
-#else
- BUILD_BUG_ON(DIRECTMAP_VIRT_START & ~FIRST_MASK);
-#endif
- /* Page table structure constraints */
-#ifdef CONFIG_ARM_64
- /*
- * The first few slots of the L0 table is reserved for the identity
- * mapping. Check that none of the other regions are overlapping
- * with it.
- */
-#define CHECK_OVERLAP_WITH_IDMAP(virt) \
- BUILD_BUG_ON(zeroeth_table_offset(virt) < IDENTITY_MAPPING_AREA_NR_L0)
-
- CHECK_OVERLAP_WITH_IDMAP(XEN_VIRT_START);
- CHECK_OVERLAP_WITH_IDMAP(VMAP_VIRT_START);
- CHECK_OVERLAP_WITH_IDMAP(FRAMETABLE_VIRT_START);
- CHECK_OVERLAP_WITH_IDMAP(DIRECTMAP_VIRT_START);
-#undef CHECK_OVERLAP_WITH_IDMAP
-#endif
- BUILD_BUG_ON(first_table_offset(XEN_VIRT_START));
-#ifdef CONFIG_ARCH_MAP_DOMAIN_PAGE
- BUILD_BUG_ON(DOMHEAP_VIRT_START & ~FIRST_MASK);
-#endif
- /*
- * The boot code expects the regions XEN_VIRT_START, FIXMAP_ADDR(0),
- * BOOT_FDT_VIRT_START to use the same 0th (arm64 only) and 1st
- * slot in the page tables.
- */
-#define CHECK_SAME_SLOT(level, virt1, virt2) \
- BUILD_BUG_ON(level##_table_offset(virt1) != level##_table_offset(virt2))
-
-#define CHECK_DIFFERENT_SLOT(level, virt1, virt2) \
- BUILD_BUG_ON(level##_table_offset(virt1) == level##_table_offset(virt2))
-
-#ifdef CONFIG_ARM_64
- CHECK_SAME_SLOT(zeroeth, XEN_VIRT_START, FIXMAP_ADDR(0));
- CHECK_SAME_SLOT(zeroeth, XEN_VIRT_START, BOOT_FDT_VIRT_START);
-#endif
- CHECK_SAME_SLOT(first, XEN_VIRT_START, FIXMAP_ADDR(0));
- CHECK_SAME_SLOT(first, XEN_VIRT_START, BOOT_FDT_VIRT_START);
-
- /*
- * For arm32, the temporary mapping will re-use the domheap
- * first slot and the second slots will match.
- */
-#ifdef CONFIG_ARM_32
- CHECK_SAME_SLOT(first, TEMPORARY_XEN_VIRT_START, DOMHEAP_VIRT_START);
- CHECK_DIFFERENT_SLOT(first, XEN_VIRT_START, TEMPORARY_XEN_VIRT_START);
- CHECK_SAME_SLOT(second, XEN_VIRT_START, TEMPORARY_XEN_VIRT_START);
-#endif
-
-#undef CHECK_SAME_SLOT
-#undef CHECK_DIFFERENT_SLOT
-}
-
void flush_page_to_ram(unsigned long mfn, bool sync_icache)
{
void *v = map_domain_page(_mfn(mfn));
@@ -163,222 +43,6 @@ void flush_page_to_ram(unsigned long mfn, bool sync_icache)
invalidate_icache();
}
-void * __init early_fdt_map(paddr_t fdt_paddr)
-{
- /* We are using 2MB superpage for mapping the FDT */
- paddr_t base_paddr = fdt_paddr & SECOND_MASK;
- paddr_t offset;
- void *fdt_virt;
- uint32_t size;
- int rc;
-
- /*
- * Check whether the physical FDT address is set and meets the minimum
- * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be at
- * least 8 bytes so that we always access the magic and size fields
- * of the FDT header after mapping the first chunk, double check if
- * that is indeed the case.
- */
- BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
- if ( !fdt_paddr || fdt_paddr % MIN_FDT_ALIGN )
- return NULL;
-
- /* The FDT is mapped using 2MB superpage */
- BUILD_BUG_ON(BOOT_FDT_VIRT_START % SZ_2M);
-
- rc = map_pages_to_xen(BOOT_FDT_VIRT_START, maddr_to_mfn(base_paddr),
- SZ_2M >> PAGE_SHIFT,
- PAGE_HYPERVISOR_RO | _PAGE_BLOCK);
- if ( rc )
- panic("Unable to map the device-tree.\n");
-
-
- offset = fdt_paddr % SECOND_SIZE;
- fdt_virt = (void *)BOOT_FDT_VIRT_START + offset;
-
- if ( fdt_magic(fdt_virt) != FDT_MAGIC )
- return NULL;
-
- size = fdt_totalsize(fdt_virt);
- if ( size > MAX_FDT_SIZE )
- return NULL;
-
- if ( (offset + size) > SZ_2M )
- {
- rc = map_pages_to_xen(BOOT_FDT_VIRT_START + SZ_2M,
- maddr_to_mfn(base_paddr + SZ_2M),
- SZ_2M >> PAGE_SHIFT,
- PAGE_HYPERVISOR_RO | _PAGE_BLOCK);
- if ( rc )
- panic("Unable to map the device-tree\n");
- }
-
- return fdt_virt;
-}
-
-void __init remove_early_mappings(void)
-{
- int rc;
-
- /* destroy the _PAGE_BLOCK mapping */
- rc = modify_xen_mappings(BOOT_FDT_VIRT_START,
- BOOT_FDT_VIRT_START + BOOT_FDT_VIRT_SIZE,
- _PAGE_BLOCK);
- BUG_ON(rc);
-}
-
-/*
- * After boot, Xen page-tables should not contain mapping that are both
- * Writable and eXecutables.
- *
- * This should be called on each CPU to enforce the policy.
- */
-static void xen_pt_enforce_wnx(void)
-{
- WRITE_SYSREG(READ_SYSREG(SCTLR_EL2) | SCTLR_Axx_ELx_WXN, SCTLR_EL2);
- /*
- * The TLBs may cache SCTLR_EL2.WXN. So ensure it is synchronized
- * before flushing the TLBs.
- */
- isb();
- flush_xen_tlb_local();
-}
-
-/* Boot-time pagetable setup.
- * Changes here may need matching changes in head.S */
-void __init setup_pagetables(unsigned long boot_phys_offset)
-{
- uint64_t ttbr;
- lpae_t pte, *p;
- int i;
-
- phys_offset = boot_phys_offset;
-
- arch_setup_page_tables();
-
-#ifdef CONFIG_ARM_64
- pte = pte_of_xenaddr((uintptr_t)xen_first);
- pte.pt.table = 1;
- pte.pt.xn = 0;
- xen_pgtable[zeroeth_table_offset(XEN_VIRT_START)] = pte;
-
- p = (void *) xen_first;
-#else
- p = (void *) cpu0_pgtable;
-#endif
-
- /* Map xen second level page-table */
- p[0] = pte_of_xenaddr((uintptr_t)(xen_second));
- p[0].pt.table = 1;
- p[0].pt.xn = 0;
-
- /* Break up the Xen mapping into pages and protect them separately. */
- for ( i = 0; i < XEN_NR_ENTRIES(3); i++ )
- {
- vaddr_t va = XEN_VIRT_START + (i << PAGE_SHIFT);
-
- if ( !is_kernel(va) )
- break;
- pte = pte_of_xenaddr(va);
- pte.pt.table = 1; /* third level mappings always have this bit set */
- if ( is_kernel_text(va) || is_kernel_inittext(va) )
- {
- pte.pt.xn = 0;
- pte.pt.ro = 1;
- }
- if ( is_kernel_rodata(va) )
- pte.pt.ro = 1;
- xen_xenmap[i] = pte;
- }
-
- /* Initialise xen second level entries ... */
- /* ... Xen's text etc */
- for ( i = 0; i < XEN_NR_ENTRIES(2); i++ )
- {
- vaddr_t va = XEN_VIRT_START + (i << XEN_PT_LEVEL_SHIFT(2));
-
- pte = pte_of_xenaddr((vaddr_t)(xen_xenmap + i * XEN_PT_LPAE_ENTRIES));
- pte.pt.table = 1;
- xen_second[second_table_offset(va)] = pte;
- }
-
- /* ... Fixmap */
- pte = pte_of_xenaddr((vaddr_t)xen_fixmap);
- pte.pt.table = 1;
- xen_second[second_table_offset(FIXMAP_ADDR(0))] = pte;
-
-#ifdef CONFIG_ARM_64
- ttbr = (uintptr_t) xen_pgtable + phys_offset;
-#else
- ttbr = (uintptr_t) cpu0_pgtable + phys_offset;
-#endif
-
- switch_ttbr(ttbr);
-
- xen_pt_enforce_wnx();
-
-#ifdef CONFIG_ARM_32
- per_cpu(xen_pgtable, 0) = cpu0_pgtable;
-#endif
-}
-
-#ifdef CONFIG_ARM_32
-/*
- * 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 directmap mappings.\n");
-
- /* Record where the directmap is, for translation routines. */
- directmap_virt_end = XENHEAP_VIRT_START + nr_mfns * PAGE_SIZE;
-}
-#else /* CONFIG_ARM_64 */
-/* 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 directmap physical and virtual offset. */
- if ( mfn_eq(directmap_mfn_start, INVALID_MFN) )
- {
- unsigned long mfn_gb = base_mfn & ~((FIRST_SIZE >> PAGE_SHIFT) - 1);
-
- 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 directmap virtual
- * address.
- */
- directmap_virt_start = DIRECTMAP_VIRT_START +
- (base_mfn - mfn_gb) * PAGE_SIZE;
- }
-
- 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 directmap mappings.\n");
-}
-#endif
-
/* Map a frame table to cover physical addresses ps through pe */
void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
{
@@ -418,51 +82,6 @@ void __init setup_frametable_mappings(paddr_t ps, paddr_t
pe)
frametable_virt_end = FRAMETABLE_VIRT_START + (nr_pdxs * sizeof(struct
page_info));
}
-void *__init arch_vmap_virt_end(void)
-{
- return (void *)(VMAP_VIRT_START + VMAP_VIRT_SIZE);
-}
-
-/* Release all __init and __initdata ranges to be reused */
-void free_init_memory(void)
-{
- paddr_t pa = virt_to_maddr(__init_begin);
- unsigned long len = __init_end - __init_begin;
- uint32_t insn;
- unsigned int i, nr = len / sizeof(insn);
- uint32_t *p;
- int rc;
-
- rc = modify_xen_mappings((unsigned long)__init_begin,
- (unsigned long)__init_end, PAGE_HYPERVISOR_RW);
- if ( rc )
- panic("Unable to map RW the init section (rc = %d)\n", rc);
-
- /*
- * From now on, init will not be used for execution anymore,
- * so nuke the instruction cache to remove entries related to init.
- */
- invalidate_icache_local();
-
-#ifdef CONFIG_ARM_32
- /* udf instruction i.e (see A8.8.247 in ARM DDI 0406C.c) */
- insn = 0xe7f000f0;
-#else
- insn = AARCH64_BREAK_FAULT;
-#endif
- p = (uint32_t *)__init_begin;
- for ( i = 0; i < nr; i++ )
- *(p + i) = insn;
-
- rc = destroy_xen_mappings((unsigned long)__init_begin,
- (unsigned long)__init_end);
- if ( rc )
- panic("Unable to remove the init section (rc = %d)\n", rc);
-
- init_domheap_pages(pa, pa + len);
- printk("Freed %ldkB init memory.\n", (long)(__init_end-__init_begin)>>10);
-}
-
int steal_page(
struct domain *d, struct page_info *page, unsigned int memflags)
{
diff --git a/xen/arch/arm/mmu/Makefile b/xen/arch/arm/mmu/Makefile
index 0e82015ee1..98aea965df 100644
--- a/xen/arch/arm/mmu/Makefile
+++ b/xen/arch/arm/mmu/Makefile
@@ -1,2 +1,3 @@
obj-y += pt.o
+obj-y += setup.o
obj-y += smpboot.o
diff --git a/xen/arch/arm/mmu/setup.c b/xen/arch/arm/mmu/setup.c
new file mode 100644
index 0000000000..eb0dda00dc
--- /dev/null
+++ b/xen/arch/arm/mmu/setup.c
@@ -0,0 +1,345 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * xen/arch/arm/mmu/setup.c
+ *
+ * MMU system boot CPU MM bringup code.
+ */
+
+#include <xen/init.h>
+#include <xen/libfdt/libfdt.h>
+#include <xen/sizes.h>
+
+#include <asm/fixmap.h>
+
+/* Override macros from asm/page.h to make them work with mfn_t */
+#undef mfn_to_virt
+#define mfn_to_virt(mfn) __mfn_to_virt(mfn_x(mfn))
+
+/* Main runtime page tables */
+
+/*
+ * For arm32 xen_pgtable are per-PCPU and are allocated before
+ * bringing up each CPU. For arm64 xen_pgtable is common to all PCPUs.
+ *
+ * xen_second, xen_fixmap and xen_xenmap are always shared between all
+ * PCPUs.
+ */
+
+#ifdef CONFIG_ARM_64
+DEFINE_PAGE_TABLE(xen_pgtable);
+static DEFINE_PAGE_TABLE(xen_first);
+#define THIS_CPU_PGTABLE xen_pgtable
+#else
+/* Per-CPU pagetable pages */
+/* xen_pgtable == root of the trie (zeroeth level on 64-bit, first on 32-bit)
*/
+DEFINE_PER_CPU(lpae_t *, xen_pgtable);
+#define THIS_CPU_PGTABLE this_cpu(xen_pgtable)
+/* Root of the trie for cpu0, other CPU's PTs are dynamically allocated */
+DEFINE_PAGE_TABLE(cpu0_pgtable);
+#endif
+
+/* Common pagetable leaves */
+/* Second level page table used to cover Xen virtual address space */
+static DEFINE_PAGE_TABLE(xen_second);
+/* Third level page table used for fixmap */
+DEFINE_BOOT_PAGE_TABLE(xen_fixmap);
+/*
+ * Third level page table used to map Xen itself with the XN bit set
+ * as appropriate.
+ */
+static DEFINE_PAGE_TABLES(xen_xenmap, XEN_NR_ENTRIES(2));
+
+/* Non-boot CPUs use this to find the correct pagetables. */
+uint64_t init_ttbr;
+
+paddr_t phys_offset;
+
+/* Limits of the Xen heap */
+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 directmap_virt_start __read_mostly;
+unsigned long directmap_base_pdx __read_mostly;
+#endif
+
+extern char __init_begin[], __init_end[];
+
+/* Checking VA memory layout alignment. */
+static void __init __maybe_unused build_assertions(void)
+{
+ /* 2MB aligned regions */
+ BUILD_BUG_ON(XEN_VIRT_START & ~SECOND_MASK);
+ BUILD_BUG_ON(FIXMAP_ADDR(0) & ~SECOND_MASK);
+ /* 1GB aligned regions */
+#ifdef CONFIG_ARM_32
+ BUILD_BUG_ON(XENHEAP_VIRT_START & ~FIRST_MASK);
+#else
+ BUILD_BUG_ON(DIRECTMAP_VIRT_START & ~FIRST_MASK);
+#endif
+ /* Page table structure constraints */
+#ifdef CONFIG_ARM_64
+ /*
+ * The first few slots of the L0 table is reserved for the identity
+ * mapping. Check that none of the other regions are overlapping
+ * with it.
+ */
+#define CHECK_OVERLAP_WITH_IDMAP(virt) \
+ BUILD_BUG_ON(zeroeth_table_offset(virt) < IDENTITY_MAPPING_AREA_NR_L0)
+
+ CHECK_OVERLAP_WITH_IDMAP(XEN_VIRT_START);
+ CHECK_OVERLAP_WITH_IDMAP(VMAP_VIRT_START);
+ CHECK_OVERLAP_WITH_IDMAP(FRAMETABLE_VIRT_START);
+ CHECK_OVERLAP_WITH_IDMAP(DIRECTMAP_VIRT_START);
+#undef CHECK_OVERLAP_WITH_IDMAP
+#endif
+ BUILD_BUG_ON(first_table_offset(XEN_VIRT_START));
+#ifdef CONFIG_ARCH_MAP_DOMAIN_PAGE
+ BUILD_BUG_ON(DOMHEAP_VIRT_START & ~FIRST_MASK);
+#endif
+ /*
+ * The boot code expects the regions XEN_VIRT_START, FIXMAP_ADDR(0),
+ * BOOT_FDT_VIRT_START to use the same 0th (arm64 only) and 1st
+ * slot in the page tables.
+ */
+#define CHECK_SAME_SLOT(level, virt1, virt2) \
+ BUILD_BUG_ON(level##_table_offset(virt1) != level##_table_offset(virt2))
+
+#define CHECK_DIFFERENT_SLOT(level, virt1, virt2) \
+ BUILD_BUG_ON(level##_table_offset(virt1) == level##_table_offset(virt2))
+
+#ifdef CONFIG_ARM_64
+ CHECK_SAME_SLOT(zeroeth, XEN_VIRT_START, FIXMAP_ADDR(0));
+ CHECK_SAME_SLOT(zeroeth, XEN_VIRT_START, BOOT_FDT_VIRT_START);
+#endif
+ CHECK_SAME_SLOT(first, XEN_VIRT_START, FIXMAP_ADDR(0));
+ CHECK_SAME_SLOT(first, XEN_VIRT_START, BOOT_FDT_VIRT_START);
+
+ /*
+ * For arm32, the temporary mapping will re-use the domheap
+ * first slot and the second slots will match.
+ */
+#ifdef CONFIG_ARM_32
+ CHECK_SAME_SLOT(first, TEMPORARY_XEN_VIRT_START, DOMHEAP_VIRT_START);
+ CHECK_DIFFERENT_SLOT(first, XEN_VIRT_START, TEMPORARY_XEN_VIRT_START);
+ CHECK_SAME_SLOT(second, XEN_VIRT_START, TEMPORARY_XEN_VIRT_START);
+#endif
+
+#undef CHECK_SAME_SLOT
+#undef CHECK_DIFFERENT_SLOT
+}
+
+void * __init early_fdt_map(paddr_t fdt_paddr)
+{
+ /* We are using 2MB superpage for mapping the FDT */
+ paddr_t base_paddr = fdt_paddr & SECOND_MASK;
+ paddr_t offset;
+ void *fdt_virt;
+ uint32_t size;
+ int rc;
+
+ /*
+ * Check whether the physical FDT address is set and meets the minimum
+ * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be at
+ * least 8 bytes so that we always access the magic and size fields
+ * of the FDT header after mapping the first chunk, double check if
+ * that is indeed the case.
+ */
+ BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
+ if ( !fdt_paddr || fdt_paddr % MIN_FDT_ALIGN )
+ return NULL;
+
+ /* The FDT is mapped using 2MB superpage */
+ BUILD_BUG_ON(BOOT_FDT_VIRT_START % SZ_2M);
+
+ rc = map_pages_to_xen(BOOT_FDT_VIRT_START, maddr_to_mfn(base_paddr),
+ SZ_2M >> PAGE_SHIFT,
+ PAGE_HYPERVISOR_RO | _PAGE_BLOCK);
+ if ( rc )
+ panic("Unable to map the device-tree.\n");
+
+
+ offset = fdt_paddr % SECOND_SIZE;
+ fdt_virt = (void *)BOOT_FDT_VIRT_START + offset;
+
+ if ( fdt_magic(fdt_virt) != FDT_MAGIC )
+ return NULL;
+
+ size = fdt_totalsize(fdt_virt);
+ if ( size > MAX_FDT_SIZE )
+ return NULL;
+
+ if ( (offset + size) > SZ_2M )
+ {
+ rc = map_pages_to_xen(BOOT_FDT_VIRT_START + SZ_2M,
+ maddr_to_mfn(base_paddr + SZ_2M),
+ SZ_2M >> PAGE_SHIFT,
+ PAGE_HYPERVISOR_RO | _PAGE_BLOCK);
+ if ( rc )
+ panic("Unable to map the device-tree\n");
+ }
+
+ return fdt_virt;
+}
+
+void __init remove_early_mappings(void)
+{
+ int rc;
+
+ /* destroy the _PAGE_BLOCK mapping */
+ rc = modify_xen_mappings(BOOT_FDT_VIRT_START,
+ BOOT_FDT_VIRT_START + BOOT_FDT_VIRT_SIZE,
+ _PAGE_BLOCK);
+ BUG_ON(rc);
+}
+
+/*
+ * After boot, Xen page-tables should not contain mapping that are both
+ * Writable and eXecutables.
+ *
+ * This should be called on each CPU to enforce the policy.
+ */
+static void xen_pt_enforce_wnx(void)
+{
+ WRITE_SYSREG(READ_SYSREG(SCTLR_EL2) | SCTLR_Axx_ELx_WXN, SCTLR_EL2);
+ /*
+ * The TLBs may cache SCTLR_EL2.WXN. So ensure it is synchronized
+ * before flushing the TLBs.
+ */
+ isb();
+ flush_xen_tlb_local();
+}
+
+/*
+ * Boot-time pagetable setup.
+ * Changes here may need matching changes in head.S
+ */
+void __init setup_pagetables(unsigned long boot_phys_offset)
+{
+ uint64_t ttbr;
+ lpae_t pte, *p;
+ int i;
+
+ phys_offset = boot_phys_offset;
+
+ arch_setup_page_tables();
+
+#ifdef CONFIG_ARM_64
+ pte = pte_of_xenaddr((uintptr_t)xen_first);
+ pte.pt.table = 1;
+ pte.pt.xn = 0;
+ xen_pgtable[zeroeth_table_offset(XEN_VIRT_START)] = pte;
+
+ p = (void *) xen_first;
+#else
+ p = (void *) cpu0_pgtable;
+#endif
+
+ /* Map xen second level page-table */
+ p[0] = pte_of_xenaddr((uintptr_t)(xen_second));
+ p[0].pt.table = 1;
+ p[0].pt.xn = 0;
+
+ /* Break up the Xen mapping into pages and protect them separately. */
+ for ( i = 0; i < XEN_NR_ENTRIES(3); i++ )
+ {
+ vaddr_t va = XEN_VIRT_START + (i << PAGE_SHIFT);
+
+ if ( !is_kernel(va) )
+ break;
+ pte = pte_of_xenaddr(va);
+ pte.pt.table = 1; /* third level mappings always have this bit set */
+ if ( is_kernel_text(va) || is_kernel_inittext(va) )
+ {
+ pte.pt.xn = 0;
+ pte.pt.ro = 1;
+ }
+ if ( is_kernel_rodata(va) )
+ pte.pt.ro = 1;
+ xen_xenmap[i] = pte;
+ }
+
+ /* Initialise xen second level entries ... */
+ /* ... Xen's text etc */
+ for ( i = 0; i < XEN_NR_ENTRIES(2); i++ )
+ {
+ vaddr_t va = XEN_VIRT_START + (i << XEN_PT_LEVEL_SHIFT(2));
+
+ pte = pte_of_xenaddr((vaddr_t)(xen_xenmap + i * XEN_PT_LPAE_ENTRIES));
+ pte.pt.table = 1;
+ xen_second[second_table_offset(va)] = pte;
+ }
+
+ /* ... Fixmap */
+ pte = pte_of_xenaddr((vaddr_t)xen_fixmap);
+ pte.pt.table = 1;
+ xen_second[second_table_offset(FIXMAP_ADDR(0))] = pte;
+
+#ifdef CONFIG_ARM_64
+ ttbr = (uintptr_t) xen_pgtable + phys_offset;
+#else
+ ttbr = (uintptr_t) cpu0_pgtable + phys_offset;
+#endif
+
+ switch_ttbr(ttbr);
+
+ xen_pt_enforce_wnx();
+
+#ifdef CONFIG_ARM_32
+ per_cpu(xen_pgtable, 0) = cpu0_pgtable;
+#endif
+}
+
+void *__init arch_vmap_virt_end(void)
+{
+ return (void *)(VMAP_VIRT_START + VMAP_VIRT_SIZE);
+}
+
+/* Release all __init and __initdata ranges to be reused */
+void free_init_memory(void)
+{
+ paddr_t pa = virt_to_maddr(__init_begin);
+ unsigned long len = __init_end - __init_begin;
+ uint32_t insn;
+ unsigned int i, nr = len / sizeof(insn);
+ uint32_t *p;
+ int rc;
+
+ rc = modify_xen_mappings((unsigned long)__init_begin,
+ (unsigned long)__init_end, PAGE_HYPERVISOR_RW);
+ if ( rc )
+ panic("Unable to map RW the init section (rc = %d)\n", rc);
+
+ /*
+ * From now on, init will not be used for execution anymore,
+ * so nuke the instruction cache to remove entries related to init.
+ */
+ invalidate_icache_local();
+
+#ifdef CONFIG_ARM_32
+ /* udf instruction i.e (see A8.8.247 in ARM DDI 0406C.c) */
+ insn = 0xe7f000f0;
+#else
+ insn = AARCH64_BREAK_FAULT;
+#endif
+ p = (uint32_t *)__init_begin;
+ for ( i = 0; i < nr; i++ )
+ *(p + i) = insn;
+
+ rc = destroy_xen_mappings((unsigned long)__init_begin,
+ (unsigned long)__init_end);
+ if ( rc )
+ panic("Unable to remove the init section (rc = %d)\n", rc);
+
+ init_domheap_pages(pa, pa + len);
+ printk("Freed %ldkB init memory.\n", (long)(__init_end-__init_begin)>>10);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.25.1
|
