| Message ID | 1462523526-3172-1-git-send-email-zhaoshenglong@huawei.com |
|---|---|
| State | New |
| Headers | show |
On 6 May 2016 at 02:32, Shannon Zhao <zhaoshenglong@huawei.com> wrote: > From: Shannon Zhao <shannon.zhao@linaro.org> > > 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. > > CC: Matt Fleming <matt@codeblueprint.co.uk> > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > --- > Drop using of EFI_PARAVIRT. Discussion can be found from [1]. > [1] https://lkml.org/lkml/2016/4/29/8 > --- > arch/arm/include/asm/efi.h | 2 + > arch/arm/xen/enlighten.c | 16 ++++++++ > arch/arm64/include/asm/efi.h | 2 + > drivers/firmware/efi/arm-runtime.c | 70 +++++++++++++++++++++++--------- > drivers/firmware/efi/efi.c | 81 ++++++++++++++++++++++++++++++-------- > 5 files changed, 137 insertions(+), 34 deletions(-) > > diff --git a/arch/arm/include/asm/efi.h b/arch/arm/include/asm/efi.h > index e0eea72..5ba4343 100644 > --- a/arch/arm/include/asm/efi.h > +++ b/arch/arm/include/asm/efi.h > @@ -52,9 +52,11 @@ static inline void efi_set_pgd(struct mm_struct *mm) > > void efi_virtmap_load(void); > void efi_virtmap_unload(void); > +int xen_arm_enable_runtime_services(void); > > #else > #define efi_init() > +#define xen_arm_enable_runtime_services() (0) > #endif /* CONFIG_EFI */ > > /* arch specific definitions used by the stub code */ > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c > index 13e3e9f..3362870 100644 > --- a/arch/arm/xen/enlighten.c > +++ b/arch/arm/xen/enlighten.c > @@ -16,6 +16,7 @@ > #include <asm/xen/hypervisor.h> > #include <asm/xen/hypercall.h> > #include <asm/system_misc.h> > +#include <asm/efi.h> > #include <linux/interrupt.h> > #include <linux/irqreturn.h> > #include <linux/module.h> > @@ -261,6 +262,13 @@ 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) && > + !efi_runtime_disabled()) > + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); > + } > + > return 0; > } > > @@ -338,6 +346,7 @@ static int __init xen_guest_init(void) > { > struct xen_add_to_physmap xatp; > struct shared_info *shared_info_page = NULL; > + int ret; > > if (!xen_domain()) > return 0; > @@ -352,6 +361,13 @@ static int __init xen_guest_init(void) > return -ENODEV; > } > > + if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_BOOT) && > + efi_enabled(EFI_RUNTIME_SERVICES)) { > + ret = xen_arm_enable_runtime_services(); > + if (ret) > + return ret; > + } > + > shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); > > if (!shared_info_page) { > diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h > index 8e88a69..574bee5 100644 > --- a/arch/arm64/include/asm/efi.h > +++ b/arch/arm64/include/asm/efi.h > @@ -8,8 +8,10 @@ > > #ifdef CONFIG_EFI > extern void efi_init(void); > +int xen_arm_enable_runtime_services(void); > #else > #define efi_init() > +#define xen_arm_enable_runtime_services() (0) > #endif > > int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); > diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c > index 6ae21e4..211ec10 100644 > --- a/drivers/firmware/efi/arm-runtime.c > +++ b/drivers/firmware/efi/arm-runtime.c > @@ -27,6 +27,7 @@ > #include <asm/mmu.h> > #include <asm/pgalloc.h> > #include <asm/pgtable.h> > +#include <asm/xen/xen-ops.h> > > extern u64 efi_system_table; > > @@ -39,6 +40,33 @@ static struct mm_struct efi_mm = { > .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), > }; > > +static int __init efi_remap_init(void) > +{ > + u64 mapsize; > + > + pr_info("Remapping and enabling EFI services.\n"); > + > + mapsize = memmap.map_end - memmap.map; > + memmap.map = (__force void *)ioremap_cache(memmap.phys_map, > + mapsize); > + if (!memmap.map) { > + pr_err("Failed to remap EFI memory map\n"); > + return -ENOMEM; > + } > + memmap.map_end = memmap.map + mapsize; > + efi.memmap = &memmap; > + > + efi.systab = (__force void *)ioremap_cache(efi_system_table, > + sizeof(efi_system_table_t)); > + if (!efi.systab) { Is there a reason why memmap.map isn't iounmap() in the error path? The original code didn't have it either, hence the question. Thanks, Mathieu > + pr_err("Failed to remap EFI System Table\n"); > + return -ENOMEM; > + } > + set_bit(EFI_SYSTEM_TABLES, &efi.flags); > + > + return 0; > +} > + > static bool __init efi_virtmap_init(void) > { > efi_memory_desc_t *md; > @@ -75,7 +103,7 @@ static bool __init efi_virtmap_init(void) > */ > static int __init arm_enable_runtime_services(void) > { > - u64 mapsize; > + int ret; > > if (!efi_enabled(EFI_BOOT)) { > pr_info("EFI services will not be available.\n"); > @@ -87,25 +115,14 @@ static int __init arm_enable_runtime_services(void) > return 0; > } > > - pr_info("Remapping and enabling EFI services.\n"); > - > - mapsize = memmap.map_end - memmap.map; > - memmap.map = (__force void *)ioremap_cache(memmap.phys_map, > - mapsize); > - if (!memmap.map) { > - pr_err("Failed to remap EFI memory map\n"); > - return -ENOMEM; > + if (efi_enabled(EFI_RUNTIME_SERVICES)) { > + pr_info("EFI runtime services access via paravirt.\n"); > + return 0; > } > - memmap.map_end = memmap.map + mapsize; > - efi.memmap = &memmap; > > - efi.systab = (__force void *)ioremap_cache(efi_system_table, > - sizeof(efi_system_table_t)); > - if (!efi.systab) { > - pr_err("Failed to remap EFI System Table\n"); > - return -ENOMEM; > - } > - set_bit(EFI_SYSTEM_TABLES, &efi.flags); > + ret = efi_remap_init(); > + if (ret) > + return ret; > > if (!efi_virtmap_init()) { > pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n"); > @@ -122,6 +139,23 @@ static int __init arm_enable_runtime_services(void) > } > early_initcall(arm_enable_runtime_services); > > +int __init xen_arm_enable_runtime_services(void) > +{ > + int ret; > + > + ret = efi_remap_init(); > + if (ret) > + return ret; > + > + if (IS_ENABLED(CONFIG_XEN_EFI)) { > + /* Set up runtime services function pointers for Xen Dom0 */ > + xen_efi_runtime_setup(); > + efi.runtime_version = efi.systab->hdr.revision; > + } > + > + return 0; > +} > + > void efi_virtmap_load(void) > { > preempt_disable(); > diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c > index 3a69ed5..f586e1e 100644 > --- a/drivers/firmware/efi/efi.c > +++ b/drivers/firmware/efi/efi.c > @@ -469,12 +469,14 @@ 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 __initdata struct params fdt_params[] = { > 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), > @@ -482,44 +484,91 @@ static __initdata struct { > UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) > }; > > +static __initdata struct params xen_fdt_params[] = { > + 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) > +}; > + > +#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) > + > +static __initdata struct { > + const char *uname; > + const char *subnode; > + struct params *params; > +} dt_params[] = { > + { "hypervisor", "uefi", xen_fdt_params }, > + { "chosen", NULL, fdt_params }, > +}; > + > struct param_info { > int found; > void *params; > + const char *missing; > }; > > -static int __init fdt_find_uefi_params(unsigned long node, const char *uname, > - int depth, void *data) > +static int __init __find_uefi_params(unsigned long node, > + struct param_info *info, > + struct params *params) > { > - struct param_info *info = data; > const void *prop; > void *dest; > u64 val; > int i, len; > > - if (depth != 1 || strcmp(uname, "chosen") != 0) > - return 0; > - > - for (i = 0; i < ARRAY_SIZE(dt_params); i++) { > - prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len); > - if (!prop) > + for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { > + prop = of_get_flat_dt_prop(node, params[i].propname, &len); > + if (!prop) { > + info->missing = params[i].name; > return 0; > - dest = info->params + dt_params[i].offset; > + } > + > + dest = info->params + params[i].offset; > info->found++; > > val = of_read_number(prop, len / sizeof(u32)); > > - if (dt_params[i].size == sizeof(u32)) > + if (params[i].size == sizeof(u32)) > *(u32 *)dest = val; > else > *(u64 *)dest = val; > > if (efi_enabled(EFI_DBG)) > - pr_info(" %s: 0x%0*llx\n", dt_params[i].name, > - dt_params[i].size * 2, val); > + pr_info(" %s: 0x%0*llx\n", params[i].name, > + params[i].size * 2, val); > } > + > return 1; > } > > +static int __init fdt_find_uefi_params(unsigned long node, const char *uname, > + int depth, void *data) > +{ > + struct param_info *info = data; > + int i; > + > + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { > + const char *subnode = dt_params[i].subnode; > + > + if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { > + info->missing = dt_params[i].params[0].name; > + continue; > + } > + > + if (subnode) { > + node = of_get_flat_dt_subnode_by_name(node, subnode); > + if (node < 0) > + return 0; > + } > + > + return __find_uefi_params(node, info, dt_params[i].params); > + } > + > + return 0; > +} > + > int __init efi_get_fdt_params(struct efi_fdt_params *params) > { > struct param_info info; > @@ -535,7 +584,7 @@ int __init efi_get_fdt_params(struct efi_fdt_params *params) > 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.missing); > > return ret; > } > -- > 2.0.4 > > > -- > To unsubscribe from this list: send the line "unsubscribe devicetree" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2016年05月11日 20:27, Matt Fleming wrote: > On Fri, 06 May, at 04:32:06PM, Shannon Zhao wrote: >> > From: Shannon Zhao <shannon.zhao@linaro.org> >> > >> > 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. > > This commit log would benefit from a little expansion. I'd like to see > information that answers the following questions, > > - How do the Xen DT paramters differ from bare metal? > - What existing code is reused with your patch? > - How are Xen runtime services different from bare metal? > - Why is it OK to force enable EFI runtime services for Xen? > > I think it would also be good to explicitly state that we do not > expect to find both Xen EFI DT parameters and bare metal EFI DT > parameters when performing the search; the two should be mutually > exclusive. > >> > CC: Matt Fleming <matt@codeblueprint.co.uk> >> > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> >> > --- >> > Drop using of EFI_PARAVIRT. Discussion can be found from [1]. >> > [1] https://lkml.org/lkml/2016/4/29/8 >> > --- >> > arch/arm/include/asm/efi.h | 2 + >> > arch/arm/xen/enlighten.c | 16 ++++++++ >> > arch/arm64/include/asm/efi.h | 2 + >> > drivers/firmware/efi/arm-runtime.c | 70 +++++++++++++++++++++++--------- >> > drivers/firmware/efi/efi.c | 81 ++++++++++++++++++++++++++++++-------- >> > 5 files changed, 137 insertions(+), 34 deletions(-) >> > >> > diff --git a/arch/arm/include/asm/efi.h b/arch/arm/include/asm/efi.h >> > index e0eea72..5ba4343 100644 >> > --- a/arch/arm/include/asm/efi.h >> > +++ b/arch/arm/include/asm/efi.h >> > @@ -52,9 +52,11 @@ static inline void efi_set_pgd(struct mm_struct *mm) >> > >> > void efi_virtmap_load(void); >> > void efi_virtmap_unload(void); >> > +int xen_arm_enable_runtime_services(void); >> > >> > #else >> > #define efi_init() >> > +#define xen_arm_enable_runtime_services() (0) >> > #endif /* CONFIG_EFI */ >> > >> > /* arch specific definitions used by the stub code */ >> > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c >> > index 13e3e9f..3362870 100644 >> > --- a/arch/arm/xen/enlighten.c >> > +++ b/arch/arm/xen/enlighten.c >> > @@ -16,6 +16,7 @@ >> > #include <asm/xen/hypervisor.h> >> > #include <asm/xen/hypercall.h> >> > #include <asm/system_misc.h> >> > +#include <asm/efi.h> >> > #include <linux/interrupt.h> >> > #include <linux/irqreturn.h> >> > #include <linux/module.h> >> > @@ -261,6 +262,13 @@ 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) && >> > + !efi_runtime_disabled()) >> > + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); >> > + } >> > + >> > return 0; >> > } >> > > The above comment could do with including similar information to the > commit log as to why we want to force enable runtime services. For x86 > we have this, > > * > * When EFI_PARAVIRT is in force then we could not map runtime > * service memory region because we do not have direct access to it. > * However, runtime services are available through proxy functions > * (e.g. in case of Xen dom0 EFI implementation they call special > * hypercall which executes relevant EFI functions) and that is why > * they are always enabled. > */ > > We need something similar here. > >> > @@ -338,6 +346,7 @@ static int __init xen_guest_init(void) >> > { >> > struct xen_add_to_physmap xatp; >> > struct shared_info *shared_info_page = NULL; >> > + int ret; >> > >> > if (!xen_domain()) >> > return 0; >> > @@ -352,6 +361,13 @@ static int __init xen_guest_init(void) >> > return -ENODEV; >> > } >> > >> > + if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_BOOT) && >> > + efi_enabled(EFI_RUNTIME_SERVICES)) { >> > + ret = xen_arm_enable_runtime_services(); >> > + if (ret) >> > + return ret; >> > + } >> > + > Is it ever possible to have EFI_RUNTIME_SERVICES set but > efi_enabled(EFI_BOOT) and IS_ENABLED(CONFIG_XEN_EFI) be false inside > this function? If the answer is "no", I'd suggest just reducing this > down to, > > /* > * The fdt parsing code will have set EFI_RUNTIME_SERVICES if > * it found Xen EFI parameters. Force enable runtime services. > */ > if (efi_enabled(EFI_RUNTIME_SERVICES)) { > ret = xen_arm_enable_runtime_services(); > if (ret) > return ret; > } > > But first, see my comments below. > >> > @@ -39,6 +40,33 @@ static struct mm_struct efi_mm = { >> > .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), >> > }; >> > >> > +static int __init efi_remap_init(void) >> > +{ >> > + u64 mapsize; >> > + >> > + pr_info("Remapping and enabling EFI services.\n"); >> > + >> > + mapsize = memmap.map_end - memmap.map; >> > + memmap.map = (__force void *)ioremap_cache(memmap.phys_map, >> > + mapsize); >> > + if (!memmap.map) { >> > + pr_err("Failed to remap EFI memory map\n"); >> > + return -ENOMEM; >> > + } >> > + memmap.map_end = memmap.map + mapsize; >> > + efi.memmap = &memmap; >> > + >> > + efi.systab = (__force void *)ioremap_cache(efi_system_table, >> > + sizeof(efi_system_table_t)); >> > + if (!efi.systab) { >> > + pr_err("Failed to remap EFI System Table\n"); >> > + return -ENOMEM; >> > + } >> > + set_bit(EFI_SYSTEM_TABLES, &efi.flags); >> > + >> > + return 0; >> > +} >> > + >> > static bool __init efi_virtmap_init(void) >> > { >> > efi_memory_desc_t *md; >> > @@ -75,7 +103,7 @@ static bool __init efi_virtmap_init(void) >> > */ >> > static int __init arm_enable_runtime_services(void) >> > { >> > - u64 mapsize; >> > + int ret; >> > >> > if (!efi_enabled(EFI_BOOT)) { >> > pr_info("EFI services will not be available.\n"); >> > @@ -87,25 +115,14 @@ static int __init arm_enable_runtime_services(void) >> > return 0; >> > } >> > >> > - pr_info("Remapping and enabling EFI services.\n"); >> > - >> > - mapsize = memmap.map_end - memmap.map; >> > - memmap.map = (__force void *)ioremap_cache(memmap.phys_map, >> > - mapsize); >> > - if (!memmap.map) { >> > - pr_err("Failed to remap EFI memory map\n"); >> > - return -ENOMEM; >> > + if (efi_enabled(EFI_RUNTIME_SERVICES)) { >> > + pr_info("EFI runtime services access via paravirt.\n"); >> > + return 0; >> > } >> > - memmap.map_end = memmap.map + mapsize; >> > - efi.memmap = &memmap; >> > >> > - efi.systab = (__force void *)ioremap_cache(efi_system_table, >> > - sizeof(efi_system_table_t)); >> > - if (!efi.systab) { >> > - pr_err("Failed to remap EFI System Table\n"); >> > - return -ENOMEM; >> > - } >> > - set_bit(EFI_SYSTEM_TABLES, &efi.flags); >> > + ret = efi_remap_init(); >> > + if (ret) >> > + return ret; >> > >> > if (!efi_virtmap_init()) { >> > pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n"); >> > @@ -122,6 +139,23 @@ static int __init arm_enable_runtime_services(void) >> > } >> > early_initcall(arm_enable_runtime_services); >> > >> > +int __init xen_arm_enable_runtime_services(void) >> > +{ >> > + int ret; >> > + >> > + ret = efi_remap_init(); >> > + if (ret) >> > + return ret; >> > + >> > + if (IS_ENABLED(CONFIG_XEN_EFI)) { >> > + /* Set up runtime services function pointers for Xen Dom0 */ >> > + xen_efi_runtime_setup(); >> > + efi.runtime_version = efi.systab->hdr.revision; >> > + } >> > + >> > + return 0; >> > +} > Since you call efi_remap_init() in both of these functions, couldn't > you leave the existing code alone and bail after setting up the memory > map and systab in arm_enable_runtime_services()? > > Also, why do you need to setup efi.runtime_version here? Isn't that > done inside uefi_init()? > I don't see any codes which setup efi.runtime_version in uefi_init(). > Here is how I would have expected this patch to look: > > - Add FDT code to find hypervisor EFI params > > - Force enable EFI_RUNTIME_SERVICES for Xen and call > xen_efi_runtime_setup() inside xen_guest_init() > > - Change arm_enable_runtime_services() to handle the case where > EFI_RUNTIME_SERVICES is already set > > Am I misunderstanding some ordering issues? Since xen_guest_init() and arm_enable_runtime_services() are both early_initcall and the calling order is random I think. And when we call xen_efi_runtime_setup() and setup efi.runtime_version in xen_guest_init(), the efi.systab might be NULL. So it needs to map the systanle explicitly before we use efi.systab. Thanks, -- Shannon -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm/include/asm/efi.h b/arch/arm/include/asm/efi.h index e0eea72..5ba4343 100644 --- a/arch/arm/include/asm/efi.h +++ b/arch/arm/include/asm/efi.h @@ -52,9 +52,11 @@ static inline void efi_set_pgd(struct mm_struct *mm) void efi_virtmap_load(void); void efi_virtmap_unload(void); +int xen_arm_enable_runtime_services(void); #else #define efi_init() +#define xen_arm_enable_runtime_services() (0) #endif /* CONFIG_EFI */ /* arch specific definitions used by the stub code */ diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 13e3e9f..3362870 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -16,6 +16,7 @@ #include <asm/xen/hypervisor.h> #include <asm/xen/hypercall.h> #include <asm/system_misc.h> +#include <asm/efi.h> #include <linux/interrupt.h> #include <linux/irqreturn.h> #include <linux/module.h> @@ -261,6 +262,13 @@ 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) && + !efi_runtime_disabled()) + set_bit(EFI_RUNTIME_SERVICES, &efi.flags); + } + return 0; } @@ -338,6 +346,7 @@ static int __init xen_guest_init(void) { struct xen_add_to_physmap xatp; struct shared_info *shared_info_page = NULL; + int ret; if (!xen_domain()) return 0; @@ -352,6 +361,13 @@ static int __init xen_guest_init(void) return -ENODEV; } + if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_BOOT) && + efi_enabled(EFI_RUNTIME_SERVICES)) { + ret = xen_arm_enable_runtime_services(); + if (ret) + return ret; + } + shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL); if (!shared_info_page) { diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h index 8e88a69..574bee5 100644 --- a/arch/arm64/include/asm/efi.h +++ b/arch/arm64/include/asm/efi.h @@ -8,8 +8,10 @@ #ifdef CONFIG_EFI extern void efi_init(void); +int xen_arm_enable_runtime_services(void); #else #define efi_init() +#define xen_arm_enable_runtime_services() (0) #endif int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c index 6ae21e4..211ec10 100644 --- a/drivers/firmware/efi/arm-runtime.c +++ b/drivers/firmware/efi/arm-runtime.c @@ -27,6 +27,7 @@ #include <asm/mmu.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> +#include <asm/xen/xen-ops.h> extern u64 efi_system_table; @@ -39,6 +40,33 @@ static struct mm_struct efi_mm = { .mmlist = LIST_HEAD_INIT(efi_mm.mmlist), }; +static int __init efi_remap_init(void) +{ + u64 mapsize; + + pr_info("Remapping and enabling EFI services.\n"); + + mapsize = memmap.map_end - memmap.map; + memmap.map = (__force void *)ioremap_cache(memmap.phys_map, + mapsize); + if (!memmap.map) { + pr_err("Failed to remap EFI memory map\n"); + return -ENOMEM; + } + memmap.map_end = memmap.map + mapsize; + efi.memmap = &memmap; + + efi.systab = (__force void *)ioremap_cache(efi_system_table, + sizeof(efi_system_table_t)); + if (!efi.systab) { + pr_err("Failed to remap EFI System Table\n"); + return -ENOMEM; + } + set_bit(EFI_SYSTEM_TABLES, &efi.flags); + + return 0; +} + static bool __init efi_virtmap_init(void) { efi_memory_desc_t *md; @@ -75,7 +103,7 @@ static bool __init efi_virtmap_init(void) */ static int __init arm_enable_runtime_services(void) { - u64 mapsize; + int ret; if (!efi_enabled(EFI_BOOT)) { pr_info("EFI services will not be available.\n"); @@ -87,25 +115,14 @@ static int __init arm_enable_runtime_services(void) return 0; } - pr_info("Remapping and enabling EFI services.\n"); - - mapsize = memmap.map_end - memmap.map; - memmap.map = (__force void *)ioremap_cache(memmap.phys_map, - mapsize); - if (!memmap.map) { - pr_err("Failed to remap EFI memory map\n"); - return -ENOMEM; + if (efi_enabled(EFI_RUNTIME_SERVICES)) { + pr_info("EFI runtime services access via paravirt.\n"); + return 0; } - memmap.map_end = memmap.map + mapsize; - efi.memmap = &memmap; - efi.systab = (__force void *)ioremap_cache(efi_system_table, - sizeof(efi_system_table_t)); - if (!efi.systab) { - pr_err("Failed to remap EFI System Table\n"); - return -ENOMEM; - } - set_bit(EFI_SYSTEM_TABLES, &efi.flags); + ret = efi_remap_init(); + if (ret) + return ret; if (!efi_virtmap_init()) { pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n"); @@ -122,6 +139,23 @@ static int __init arm_enable_runtime_services(void) } early_initcall(arm_enable_runtime_services); +int __init xen_arm_enable_runtime_services(void) +{ + int ret; + + ret = efi_remap_init(); + if (ret) + return ret; + + if (IS_ENABLED(CONFIG_XEN_EFI)) { + /* Set up runtime services function pointers for Xen Dom0 */ + xen_efi_runtime_setup(); + efi.runtime_version = efi.systab->hdr.revision; + } + + return 0; +} + void efi_virtmap_load(void) { preempt_disable(); diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 3a69ed5..f586e1e 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -469,12 +469,14 @@ 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 __initdata struct params fdt_params[] = { 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), @@ -482,44 +484,91 @@ static __initdata struct { UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver) }; +static __initdata struct params xen_fdt_params[] = { + 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) +}; + +#define EFI_FDT_PARAMS_SIZE ARRAY_SIZE(fdt_params) + +static __initdata struct { + const char *uname; + const char *subnode; + struct params *params; +} dt_params[] = { + { "hypervisor", "uefi", xen_fdt_params }, + { "chosen", NULL, fdt_params }, +}; + struct param_info { int found; void *params; + const char *missing; }; -static int __init fdt_find_uefi_params(unsigned long node, const char *uname, - int depth, void *data) +static int __init __find_uefi_params(unsigned long node, + struct param_info *info, + struct params *params) { - struct param_info *info = data; const void *prop; void *dest; u64 val; int i, len; - if (depth != 1 || strcmp(uname, "chosen") != 0) - return 0; - - for (i = 0; i < ARRAY_SIZE(dt_params); i++) { - prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len); - if (!prop) + for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) { + prop = of_get_flat_dt_prop(node, params[i].propname, &len); + if (!prop) { + info->missing = params[i].name; return 0; - dest = info->params + dt_params[i].offset; + } + + dest = info->params + params[i].offset; info->found++; val = of_read_number(prop, len / sizeof(u32)); - if (dt_params[i].size == sizeof(u32)) + if (params[i].size == sizeof(u32)) *(u32 *)dest = val; else *(u64 *)dest = val; if (efi_enabled(EFI_DBG)) - pr_info(" %s: 0x%0*llx\n", dt_params[i].name, - dt_params[i].size * 2, val); + pr_info(" %s: 0x%0*llx\n", params[i].name, + params[i].size * 2, val); } + return 1; } +static int __init fdt_find_uefi_params(unsigned long node, const char *uname, + int depth, void *data) +{ + struct param_info *info = data; + int i; + + for (i = 0; i < ARRAY_SIZE(dt_params); i++) { + const char *subnode = dt_params[i].subnode; + + if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) { + info->missing = dt_params[i].params[0].name; + continue; + } + + if (subnode) { + node = of_get_flat_dt_subnode_by_name(node, subnode); + if (node < 0) + return 0; + } + + return __find_uefi_params(node, info, dt_params[i].params); + } + + return 0; +} + int __init efi_get_fdt_params(struct efi_fdt_params *params) { struct param_info info; @@ -535,7 +584,7 @@ int __init efi_get_fdt_params(struct efi_fdt_params *params) 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.missing); return ret; }