[PATCH v5 01/22] arm/acpi: Estimate memory required for acpi/efi tables

[Shannon Zhao <zhaoshenglong@huawei.com>]

From: Shannon Zhao <shannon.zhao@linaro.org>

Estimate the memory required for loading acpi/efi tables in Dom0. Make
the length of each table aligned with 64bit. Alloc the pages to store
the new created EFI and ACPI tables and free these pages when
destroying domain.

Cc: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Parth Dixit <parth.dixit@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
v5: add a new file efi-dom0.c
---
 xen/arch/arm/domain.c       |  4 +++
 xen/arch/arm/domain_build.c | 81 ++++++++++++++++++++++++++++++++++++++++++++-
 xen/arch/arm/efi/Makefile   |  2 +-
 xen/arch/arm/efi/efi-dom0.c | 48 +++++++++++++++++++++++++++
 xen/common/efi/boot.c       |  7 ++++
 xen/common/efi/efi.h        |  4 +++
 xen/include/asm-arm/setup.h |  2 ++
 7 files changed, 146 insertions(+), 2 deletions(-)
 create mode 100644 xen/arch/arm/efi/efi-dom0.c

diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 3d274ae..1365b4a 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -640,6 +640,10 @@ void arch_domain_destroy(struct domain *d)
     domain_vgic_free(d);
     domain_vuart_free(d);
     free_xenheap_page(d->shared_info);
+#ifdef CONFIG_ACPI
+    free_xenheap_pages(d->arch.efi_acpi_table,
+                       get_order_from_bytes(d->arch.efi_acpi_len));
+#endif
 }
 
 void arch_domain_shutdown(struct domain *d)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 83676e4..4e20499 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -12,6 +12,8 @@
 #include <xen/libfdt/libfdt.h>
 #include <xen/guest_access.h>
 #include <xen/iocap.h>
+#include <xen/acpi.h>
+#include <acpi/actables.h>
 #include <asm/device.h>
 #include <asm/setup.h>
 #include <asm/platform.h>
@@ -1354,6 +1356,79 @@ static int prepare_dtb(struct domain *d, struct kernel_info *kinfo)
     return -EINVAL;
 }
 
+#ifdef CONFIG_ACPI
+static int estimate_acpi_efi_size(struct domain *d, struct kernel_info *kinfo)
+{
+    size_t efi_size, acpi_size, madt_size;
+    u64 addr;
+    struct acpi_table_rsdp *rsdp_tbl;
+    struct acpi_table_header *table;
+
+    efi_size = estimate_efi_size(kinfo->mem.nr_banks);
+
+    acpi_size = ROUNDUP(sizeof(struct acpi_table_fadt), 8);
+    acpi_size += ROUNDUP(sizeof(struct acpi_table_stao), 8);
+
+    madt_size = sizeof(struct acpi_table_madt)
+                + sizeof(struct acpi_madt_generic_interrupt) * d->max_vcpus
+                + sizeof(struct acpi_madt_generic_distributor);
+    if ( d->arch.vgic.version == GIC_V3 )
+        madt_size += sizeof(struct acpi_madt_generic_redistributor)
+                     * d->arch.vgic.nr_regions;
+    acpi_size += ROUNDUP(madt_size, 8);
+
+    addr = acpi_os_get_root_pointer();
+    if ( !addr )
+    {
+        printk("Unable to get acpi root pointer\n");
+        return -EINVAL;
+    }
+    rsdp_tbl = acpi_os_map_memory(addr, sizeof(struct acpi_table_rsdp));
+    table = acpi_os_map_memory(rsdp_tbl->xsdt_physical_address,
+                               sizeof(struct acpi_table_header));
+    /* Add place for STAO table in XSDT table */
+    acpi_size += ROUNDUP(table->length + sizeof(u64), 8);
+    acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+    acpi_os_unmap_memory(rsdp_tbl, sizeof(struct acpi_table_rsdp));
+
+    acpi_size += ROUNDUP(sizeof(struct acpi_table_rsdp), 8);
+    d->arch.efi_acpi_len = ROUNDUP(efi_size, 8) + ROUNDUP(acpi_size, 8);
+
+    return 0;
+}
+
+static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
+{
+    int rc = 0;
+    int order;
+
+    rc = estimate_acpi_efi_size(d, kinfo);
+    if ( rc != 0 )
+        return rc;
+
+    order = get_order_from_bytes(d->arch.efi_acpi_len);
+    d->arch.efi_acpi_table = alloc_xenheap_pages(order, 0);
+    if ( d->arch.efi_acpi_table == NULL )
+    {
+        printk("unable to allocate memory!\n");
+        return -ENOMEM;
+    }
+    memset(d->arch.efi_acpi_table, 0, d->arch.efi_acpi_len);
+
+    /* For ACPI, Dom0 doesn't use kinfo->gnttab_start to get the grant table
+     * region. So we use it as the ACPI table mapped address. */
+    d->arch.efi_acpi_gpa = kinfo->gnttab_start;
+
+    return 0;
+}
+#else
+static int prepare_acpi(struct domain *d, struct kernel_info *kinfo)
+{
+    /* Only booting with ACPI will hit here */
+    BUG_ON(1);
+    return -EINVAL;
+}
+#endif
 static void dtb_load(struct kernel_info *kinfo)
 {
     void * __user dtb_virt = (void * __user)(register_t)kinfo->dtb_paddr;
@@ -1540,7 +1615,11 @@ int construct_dom0(struct domain *d)
     allocate_memory(d, &kinfo);
     find_gnttab_region(d, &kinfo);
 
-    rc = prepare_dtb(d, &kinfo);
+    if ( acpi_disabled )
+        rc = prepare_dtb(d, &kinfo);
+    else
+        rc = prepare_acpi(d, &kinfo);
+
     if ( rc < 0 )
         return rc;
 
diff --git a/xen/arch/arm/efi/Makefile b/xen/arch/arm/efi/Makefile
index 729e53e..b38a0c9 100644
--- a/xen/arch/arm/efi/Makefile
+++ b/xen/arch/arm/efi/Makefile
@@ -1,3 +1,3 @@
 CFLAGS += -fshort-wchar
 
-obj-y +=  boot.init.o runtime.o
+obj-y +=  boot.init.o runtime.o efi-dom0.init.o
diff --git a/xen/arch/arm/efi/efi-dom0.c b/xen/arch/arm/efi/efi-dom0.c
new file mode 100644
index 0000000..d54c38f
--- /dev/null
+++ b/xen/arch/arm/efi/efi-dom0.c
@@ -0,0 +1,48 @@
+/*
+ *  efi-dom0.c - Domain0 EFI Boot Support
+ *
+ *  Copyright (C) 2016 Shannon Zhao <shannon.zhao@linaro.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; If not, see <http://www.gnu.org/licenses/>.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include "efi.h"
+#include <asm/setup.h>
+#include <asm/acpi.h>
+
+/* Constant to indicate "Xen" in unicode u16 format */
+static const CHAR16 xen_efi_fw_vendor[] = {0x0058, 0x0065, 0x006E, 0x0000};
+
+size_t __init estimate_efi_size(int mem_nr_banks)
+{
+    size_t size;
+    size_t est_size = sizeof(EFI_SYSTEM_TABLE);
+    size_t ect_size = sizeof(EFI_CONFIGURATION_TABLE);
+    size_t emd_size = sizeof(EFI_MEMORY_DESCRIPTOR);
+    size_t fw_vendor_size = sizeof(xen_efi_fw_vendor);
+    int acpi_mem_nr_banks = 0;
+
+    if ( !acpi_disabled )
+        acpi_mem_nr_banks = get_acpi_meminfo()->nr_banks;
+
+    size = ROUNDUP(est_size + ect_size + fw_vendor_size, 8);
+    /* plus 1 for new created tables */
+    size += ROUNDUP(emd_size * (mem_nr_banks + acpi_mem_nr_banks + 1), 8);
+
+    return size;
+}
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index 125c9ce..f4f436f 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -1151,6 +1151,13 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
     for( ; ; ); /* not reached */
 }
 
+#if defined (CONFIG_ACPI) && defined (CONFIG_ARM)
+struct meminfo __init *get_acpi_meminfo(void)
+{
+    return &acpi_mem;
+}
+#endif
+
 #ifndef CONFIG_ARM /* TODO - runtime service support */
 
 static bool_t __initdata efi_rs_enable = 1;
diff --git a/xen/common/efi/efi.h b/xen/common/efi/efi.h
index c557104..d7b1018 100644
--- a/xen/common/efi/efi.h
+++ b/xen/common/efi/efi.h
@@ -39,3 +39,7 @@ extern UINT64 efi_boot_max_var_store_size, efi_boot_remain_var_store_size,
 
 unsigned long efi_rs_enter(void);
 void efi_rs_leave(unsigned long);
+
+#ifdef CONFIG_ARM
+struct meminfo *get_acpi_meminfo(void);
+#endif
diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
index 30ac53b..7f233a1 100644
--- a/xen/include/asm-arm/setup.h
+++ b/xen/include/asm-arm/setup.h
@@ -51,6 +51,8 @@ void arch_init_memory(void);
 
 void copy_from_paddr(void *dst, paddr_t paddr, unsigned long len);
 
+size_t estimate_efi_size(int mem_nr_banks);
+
 int construct_dom0(struct domain *d);
 
 void discard_initial_modules(void);
-- 
2.0.4



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