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Subject[PATCH v3 5/5] xen: Put EFI machinery in place
Date
Put EFI machinery for Xen in place.

This patch is based on Jan Beulich and Tang Liang work.

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Tang Liang <liang.tang@oracle.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
arch/x86/xen/enlighten.c | 10 ++
drivers/xen/Kconfig | 3 +
drivers/xen/Makefile | 1 +
drivers/xen/efi.c | 425 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 439 insertions(+)
create mode 100644 drivers/xen/efi.c

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 201d09a..38bdb96 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -150,6 +150,14 @@ struct shared_info *HYPERVISOR_shared_info = &xen_dummy_shared_info;
*/
static int have_vcpu_info_placement = 1;

+#ifdef CONFIG_XEN_EFI
+extern void __init xen_efi_probe(void);
+#else
+static void __init xen_efi_probe(void)
+{
+}
+#endif
+
struct tls_descs {
struct desc_struct desc[3];
};
@@ -1714,6 +1722,8 @@ asmlinkage void __init xen_start_kernel(void)

xen_setup_runstate_info(0);

+ xen_efi_probe();
+
/* Start the world */
#ifdef CONFIG_X86_32
i386_start_kernel();
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 38fb36e..cead283 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -240,4 +240,7 @@ config XEN_MCE_LOG
config XEN_HAVE_PVMMU
bool

+config XEN_EFI
+ def_bool X86_64 && EFI
+
endmenu
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 45e00af..c35de02 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_XEN_STUB) += xen-stub.o
obj-$(CONFIG_XEN_ACPI_HOTPLUG_MEMORY) += xen-acpi-memhotplug.o
obj-$(CONFIG_XEN_ACPI_HOTPLUG_CPU) += xen-acpi-cpuhotplug.o
obj-$(CONFIG_XEN_ACPI_PROCESSOR) += xen-acpi-processor.o
+obj-$(CONFIG_XEN_EFI) += efi.o
xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
xen-gntalloc-y := gntalloc.o
diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c
new file mode 100644
index 0000000..f3768e7
--- /dev/null
+++ b/drivers/xen/efi.c
@@ -0,0 +1,425 @@
+/*
+ * EFI support for Xen.
+ *
+ * Copyright (C) 1999 VA Linux Systems
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999-2002 Hewlett-Packard Co.
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ * Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2005-2008 Intel Co.
+ * Fenghua Yu <fenghua.yu@intel.com>
+ * Bibo Mao <bibo.mao@intel.com>
+ * Chandramouli Narayanan <mouli@linux.intel.com>
+ * Huang Ying <ying.huang@intel.com>
+ * Copyright (C) 2011 Novell Co.
+ * Jan Beulic <JBeulich@suse.com>
+ * Copyright (C) 2011-2012 Oracle Co.
+ * Liang Tang <liang.tang@oracle.com>
+ * Copyright (c) 2014 Daniel Kiper, Oracle Corporation
+ */
+
+#include <linux/efi.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/time.h>
+#include <linux/spinlock.h>
+
+#include <asm/cacheflush.h>
+#include <asm/efi.h>
+#include <asm/tlbflush.h>
+#include <asm/setup.h>
+
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+
+#define PFX "EFI: "
+
+#define call (op.u.efi_runtime_call)
+#define DECLARE_CALL(what) \
+ struct xen_platform_op op; \
+ op.cmd = XENPF_efi_runtime_call; \
+ call.function = XEN_EFI_##what; \
+ call.misc = 0
+
+static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+{
+ int err;
+ DECLARE_CALL(get_time);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.get_time.time));
+ memcpy(tm, &call.u.get_time.time, sizeof(*tm));
+ }
+
+ if (tc) {
+ tc->resolution = call.u.get_time.resolution;
+ tc->accuracy = call.u.get_time.accuracy;
+ tc->sets_to_zero = !!(call.misc &
+ XEN_EFI_GET_TIME_SET_CLEARS_NS);
+ }
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_time(efi_time_t *tm)
+{
+ DECLARE_CALL(set_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.set_time));
+ memcpy(&call.u.set_time, tm, sizeof(*tm));
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
+ efi_bool_t *pending,
+ efi_time_t *tm)
+{
+ int err;
+ DECLARE_CALL(get_wakeup_time);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ if (tm) {
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.get_wakeup_time));
+ memcpy(tm, &call.u.get_wakeup_time, sizeof(*tm));
+ }
+
+ if (enabled)
+ *enabled = !!(call.misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
+
+ if (pending)
+ *pending = !!(call.misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+{
+ DECLARE_CALL(set_wakeup_time);
+
+ BUILD_BUG_ON(sizeof(*tm) != sizeof(call.u.set_wakeup_time));
+ if (enabled)
+ call.misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
+ if (tm)
+ memcpy(&call.u.set_wakeup_time, tm, sizeof(*tm));
+ else
+ call.misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_get_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 *attr,
+ unsigned long *data_size,
+ void *data)
+{
+ int err;
+ DECLARE_CALL(get_variable);
+
+ set_xen_guest_handle(call.u.get_variable.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.get_variable.vendor_guid));
+ memcpy(&call.u.get_variable.vendor_guid, vendor, sizeof(*vendor));
+ call.u.get_variable.size = *data_size;
+ set_xen_guest_handle(call.u.get_variable.data, data);
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *data_size = call.u.get_variable.size;
+ *attr = call.misc; /* misc in struction is U32 variable*/
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+ efi_char16_t *name,
+ efi_guid_t *vendor)
+{
+ int err;
+ DECLARE_CALL(get_next_variable_name);
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+ call.u.get_next_variable_name.size = *name_size;
+ set_xen_guest_handle(call.u.get_next_variable_name.name, name);
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.get_next_variable_name.vendor_guid));
+ memcpy(&call.u.get_next_variable_name.vendor_guid, vendor,
+ sizeof(*vendor));
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *name_size = call.u.get_next_variable_name.size;
+ memcpy(vendor, &call.u.get_next_variable_name.vendor_guid,
+ sizeof(*vendor));
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_set_variable(efi_char16_t *name,
+ efi_guid_t *vendor,
+ u32 attr,
+ unsigned long data_size,
+ void *data)
+{
+ DECLARE_CALL(set_variable);
+
+ set_xen_guest_handle(call.u.set_variable.name, name);
+ call.misc = attr;
+ BUILD_BUG_ON(sizeof(*vendor) !=
+ sizeof(call.u.set_variable.vendor_guid));
+ memcpy(&call.u.set_variable.vendor_guid, vendor, sizeof(*vendor));
+ call.u.set_variable.size = data_size;
+ set_xen_guest_handle(call.u.set_variable.data, data);
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_query_variable_info(u32 attr,
+ u64 *storage_space,
+ u64 *remaining_space,
+ u64 *max_variable_size)
+{
+ int err;
+ DECLARE_CALL(query_variable_info);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *storage_space = call.u.query_variable_info.max_store_size;
+ *remaining_space = call.u.query_variable_info.remain_store_size;
+ *max_variable_size = call.u.query_variable_info.max_size;
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
+{
+ int err;
+ DECLARE_CALL(get_next_high_monotonic_count);
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *count = call.misc;
+
+ return call.status;
+}
+
+static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+ unsigned long count,
+ unsigned long sg_list)
+{
+ DECLARE_CALL(update_capsule);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(call.u.update_capsule.capsule_header_array,
+ capsules);
+ call.u.update_capsule.capsule_count = count;
+ call.u.update_capsule.sg_list = sg_list;
+
+ return HYPERVISOR_dom0_op(&op) ? EFI_UNSUPPORTED : call.status;
+}
+
+static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+ unsigned long count,
+ u64 *max_size,
+ int *reset_type)
+{
+ int err;
+ DECLARE_CALL(query_capsule_capabilities);
+
+ if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
+ return EFI_UNSUPPORTED;
+
+ set_xen_guest_handle(call.u.query_capsule_capabilities.
+ capsule_header_array, capsules);
+ call.u.query_capsule_capabilities.capsule_count = count;
+
+ err = HYPERVISOR_dom0_op(&op);
+ if (err)
+ return EFI_UNSUPPORTED;
+
+ *max_size = call.u.query_capsule_capabilities.max_capsule_size;
+ *reset_type = call.u.query_capsule_capabilities.reset_type;
+
+ return call.status;
+}
+
+#undef DECLARE_CALL
+#undef call
+
+static efi_system_table_t efi_systab __initdata = {};
+
+static const struct efi efi_xen __initconst = {
+ .systab = &efi_systab,
+ .mps = EFI_INVALID_TABLE_ADDR,
+ .acpi = EFI_INVALID_TABLE_ADDR,
+ .acpi20 = EFI_INVALID_TABLE_ADDR,
+ .smbios = EFI_INVALID_TABLE_ADDR,
+ .sal_systab = EFI_INVALID_TABLE_ADDR,
+ .boot_info = EFI_INVALID_TABLE_ADDR,
+ .hcdp = EFI_INVALID_TABLE_ADDR,
+ .uga = EFI_INVALID_TABLE_ADDR,
+ .uv_systab = EFI_INVALID_TABLE_ADDR,
+ .fw_vendor = EFI_INVALID_TABLE_ADDR,
+ .runtime = EFI_INVALID_TABLE_ADDR,
+ .config_table = EFI_INVALID_TABLE_ADDR,
+ .get_time = xen_efi_get_time,
+ .set_time = xen_efi_set_time,
+ .get_wakeup_time = xen_efi_get_wakeup_time,
+ .set_wakeup_time = xen_efi_set_wakeup_time,
+ .get_variable = xen_efi_get_variable,
+ .get_next_variable = xen_efi_get_next_variable,
+ .set_variable = xen_efi_set_variable,
+ .query_variable_info = xen_efi_query_variable_info,
+ .update_capsule = xen_efi_update_capsule,
+ .query_capsule_caps = xen_efi_query_capsule_caps,
+ .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
+ .reset_system = NULL, /* Functionality provided by Xen. */
+ .set_virtual_address_map = NULL, /* Not used under Xen. */
+ .memmap = NULL /* Not used under Xen. */
+};
+
+static void __init efi_init_xen(void)
+{
+ efi_char16_t vendor_c16[100];
+ char vendor[ARRAY_SIZE(vendor_c16)];
+ int ret, i;
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ efi = efi_xen;
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+
+ /*
+ * Show what we know for posterity
+ */
+ op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
+ info->vendor.bufsz = sizeof(vendor_c16);
+ set_xen_guest_handle(info->vendor.name, vendor_c16);
+ ret = HYPERVISOR_dom0_op(&op);
+ if (!ret) {
+ for (i = 0; i < sizeof(vendor) - 1 && vendor_c16[i]; ++i)
+ vendor[i] = vendor_c16[i];
+ vendor[i] = '\0';
+ } else
+ pr_err("Could not get the firmware vendor!\n");
+
+ op.u.firmware_info.index = XEN_FW_EFI_VERSION;
+ ret = HYPERVISOR_dom0_op(&op);
+ if (!ret)
+ pr_info("EFI v%u.%.02u by %s\n",
+ info->version >> 16,
+ info->version & 0xffff, vendor);
+ else
+ pr_err("Could not get EFI revision!\n");
+
+ op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
+ ret = HYPERVISOR_dom0_op(&op);
+ if (!ret)
+ efi.runtime_version = info->version;
+ else
+ pr_warn(PFX "Could not get runtime services revision.\n");
+
+ /*
+ * Let's see what config tables the firmware passed to us.
+ */
+ op.u.firmware_info.index = XEN_FW_EFI_CONFIG_TABLE;
+ if (HYPERVISOR_dom0_op(&op))
+ BUG();
+
+ efi.systab->tables = info->cfg.addr;
+ efi.systab->nr_tables = info->cfg.nent;
+
+ if (efi_config_init(arch_tables))
+ return;
+
+ set_bit(EFI_CONFIG_TABLES, &x86_efi_facility);
+
+ x86_platform.get_wallclock = efi_get_time;
+ x86_platform.set_wallclock = efi_set_rtc_mmss;
+
+ set_bit(EFI_RUNTIME_SERVICES, &x86_efi_facility);
+}
+
+static void __init efi_reserve_boot_services_xen(void)
+{
+}
+
+static void __init efi_enter_virtual_mode_xen(void)
+{
+}
+
+/*
+ * Convenience functions to obtain memory types and attributes
+ */
+static u32 efi_mem_type_xen(unsigned long phys_addr)
+{
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_MEM_INFO;
+ info->mem.addr = phys_addr;
+ info->mem.size = 0;
+ return HYPERVISOR_dom0_op(&op) ? 0 : info->mem.type;
+}
+
+static u64 efi_mem_attributes_xen(unsigned long phys_addr)
+{
+ struct xen_platform_op op;
+ union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+ op.cmd = XENPF_firmware_info;
+ op.u.firmware_info.type = XEN_FW_EFI_INFO;
+ op.u.firmware_info.index = XEN_FW_EFI_MEM_INFO;
+ info->mem.addr = phys_addr;
+ info->mem.size = 0;
+ return HYPERVISOR_dom0_op(&op) ? 0 : info->mem.attr;
+}
+
+void __init xen_efi_probe(void)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_firmware_info,
+ .u.firmware_info = {
+ .type = XEN_FW_EFI_INFO,
+ .index = XEN_FW_EFI_CONFIG_TABLE
+ }
+ };
+
+ if (!xen_initial_domain() || HYPERVISOR_dom0_op(&op))
+ return;
+
+ /* Here we know that Xen runs on EFI platform. */
+
+ efi_init_ops.efi_init = efi_init_xen;
+ efi_init_ops.efi_reserve_boot_services = efi_reserve_boot_services_xen;
+ efi_init_ops.efi_enter_virtual_mode = efi_enter_virtual_mode_xen;
+ efi_init_ops.efi_mem_type = efi_mem_type_xen;
+ efi_init_ops.efi_mem_attributes = efi_mem_attributes_xen;
+
+ set_bit(EFI_BOOT, &x86_efi_facility);
+ set_bit(EFI_64BIT, &x86_efi_facility);
+}
--
1.7.10.4


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