[Xen-devel] [PATCH v3 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Add a new function to parse DT parameters for Xen specific UEFI just
like the way for normal UEFI. Then it could reuse the existing codes.

If Xen supports EFI, initialize runtime services.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
CC: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
---
 arch/arm/xen/enlighten.c   |  6 ++++++
 arch/arm64/kernel/efi.c    | 17 ++++++++++++-----
 drivers/firmware/efi/efi.c | 45 ++++++++++++++++++++++++++++++++++++++-------
 3 files changed, 56 insertions(+), 12 deletions(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index cdc0bd2..608d735 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -245,6 +245,12 @@ static int __init fdt_find_hyper_node(unsigned long node, 
const char *uname,
            !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
                hyper_node.version = s + strlen(hyper_node.prefix);
 
+       if (IS_ENABLED(CONFIG_XEN_EFI)) {
+               /* Check if Xen supports EFI */
+               if (of_get_flat_dt_subnode_by_name(node, "uefi") > 0)
+                       set_bit(EFI_PARAVIRT, &efi.flags);
+       }
+
        return 0;
 }
 
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 4eeb171..3c46129 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -33,6 +33,7 @@
 #include <asm/mmu_context.h>
 #include <asm/mmu.h>
 #include <asm/pgtable.h>
+#include <asm/xen/xen-ops.h>
 
 struct efi_memory_map memmap;
 
@@ -308,13 +309,19 @@ static int __init arm64_enable_runtime_services(void)
        }
        set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 
-       if (!efi_virtmap_init()) {
-               pr_err("No UEFI virtual mapping was installed -- runtime 
services will not be available\n");
-               return -ENOMEM;
+       if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_PARAVIRT)) {
+               /* Set up runtime services function pointers for Xen Dom0 */
+               xen_efi_runtime_setup();
+       } else {
+               if (!efi_virtmap_init()) {
+                       pr_err("No UEFI virtual mapping was installed -- 
runtime services will not be available\n");
+                       return -ENOMEM;
+               }
+
+               /* Set up runtime services function pointers */
+               efi_native_runtime_setup();
        }
 
-       /* Set up runtime services function pointers */
-       efi_native_runtime_setup();
        set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 
        efi.runtime_version = efi.systab->hdr.revision;
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 027ca21..bdcf6d7 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -498,12 +498,14 @@ device_initcall(efi_load_efivars);
                FIELD_SIZEOF(struct efi_fdt_params, field) \
        }
 
-static __initdata struct {
+struct params {
        const char name[32];
        const char propname[32];
        int offset;
        int size;
-} dt_params[] = {
+};
+
+static struct params fdt_params[] __initdata = {
        UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
        UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
        UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
@@ -511,24 +513,45 @@ static __initdata struct {
        UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
 };
 
+static struct params xen_fdt_params[] __initdata = {
+       UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
+       UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
+       UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
+       UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
+       UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
+};
+
 struct param_info {
        int found;
        void *params;
+       struct params *dt_params;
+       int size;
 };
 
 static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
                                       int depth, void *data)
 {
        struct param_info *info = data;
+       struct params *dt_params = info->dt_params;
        const void *prop;
        void *dest;
        u64 val;
-       int i, len;
+       int i, len, offset;
 
-       if (depth != 1 || strcmp(uname, "chosen") != 0)
-               return 0;
+       if (efi_enabled(EFI_PARAVIRT)) {
+               if (depth != 1 || strcmp(uname, "hypervisor") != 0)
+                       return 0;
 
-       for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+               offset = of_get_flat_dt_subnode_by_name(node, "uefi");
+               if (offset < 0)
+                       return 0;
+               node = offset;
+       } else {
+               if (depth != 1 || strcmp(uname, "chosen") != 0)
+                       return 0;
+       }
+
+       for (i = 0; i < info->size; i++) {
                prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
                if (!prop)
                        return 0;
@@ -559,12 +582,20 @@ int __init efi_get_fdt_params(struct efi_fdt_params 
*params)
        info.found = 0;
        info.params = params;
 
+       if (efi_enabled(EFI_PARAVIRT)) {
+               info.dt_params = xen_fdt_params;
+               info.size = ARRAY_SIZE(xen_fdt_params);
+       } else {
+               info.dt_params = fdt_params;
+               info.size = ARRAY_SIZE(fdt_params);
+       }
+
        ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
        if (!info.found)
                pr_info("UEFI not found.\n");
        else if (!ret)
                pr_err("Can't find '%s' in device tree!\n",
-                      dt_params[info.found].name);
+                      info.dt_params[info.found].name);
 
        return ret;
 }
-- 
2.0.4



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel