[PATCH v2 0/2] mini-os: repair stubdom build

[PATCH v2 0/2] mini-os: repair stubdom build

[Juergen Gross]

The patch series adding HVMlite support for Mini-OS unfortunately
broke building Xen's stubdoms. This small series repairs the broken
bits again.

V2: patch 1: remove CONFIG_KEEP_STARTINFO

Juergen Gross (2):
  mini-os: partially revert "remove using start_info ..."
  mini-os: don't get xenbus parameters if xenbus is disabled

 arch/x86/setup.c     | 12 ++++++++++++
 include/hypervisor.h | 13 ++++++++++++-
 include/xenbus.h     |  5 ++++-
 3 files changed, 28 insertions(+), 2 deletions(-)

-- 
2.6.6


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[PATCH v2 1/2] mini-os: partially revert "remove using start_info ..."

[Juergen Gross]

Commit e33452c4f5547ed14defe6382b3b53664ac5bd8a ("remove using
start_info in architecture independent code") removed the start_info
variable completely. grub stubdom needs the start_info structure.

Readd the start_info structure, but make it dependent on
CONFIG_PARAVIRT.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/setup.c     | 12 ++++++++++++
 include/hypervisor.h | 13 ++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index 86955cf..5278227 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -33,6 +33,14 @@
 #include <xen/arch-x86/cpuid.h>
 #include <xen/arch-x86/hvm/start_info.h>
 
+#ifdef CONFIG_PARAVIRT
+/*
+ * This structure contains start-of-day info, such as pagetable base pointer,
+ * address of the shared_info structure, and things like that.
+ */
+union start_info_union start_info_union;
+#endif
+
 /*
  * Shared page for communicating with the hypervisor.
  * Events flags go here, for example.
@@ -189,6 +197,10 @@ arch_init(void *par)
 	/* print out some useful information  */
 	print_start_of_day(par);
 
+#ifdef CONFIG_PARAVIRT
+	memcpy(&start_info, par, sizeof(start_info));
+#endif
+
 	start_kernel();
 }
 
diff --git a/include/hypervisor.h b/include/hypervisor.h
index 3073a8a..f3b1f3c 100644
--- a/include/hypervisor.h
+++ b/include/hypervisor.h
@@ -27,7 +27,18 @@
 #include <mini-os/traps.h>
 
 /* hypervisor.c */
-#ifndef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT
+/*
+ * a placeholder for the start of day information passed up from the hypervisor
+ */
+union start_info_union
+{
+    start_info_t start_info;
+    char padding[512];
+};
+extern union start_info_union start_info_union;
+#define start_info (start_info_union.start_info)
+#else
 int hvm_get_parameter(int idx, uint64_t *value);
 int hvm_set_parameter(int idx, uint64_t value);
 #endif
-- 
2.6.6


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[PATCH v2 2/2] mini-os: don't get xenbus parameters if xenbus is disabled

[Juergen Gross]

get_xenbus() should be called only if CONFIG_XENBUS is set.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 include/xenbus.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/xenbus.h b/include/xenbus.h
index 5646a25..c254652 100644
--- a/include/xenbus.h
+++ b/include/xenbus.h
@@ -9,10 +9,14 @@ typedef unsigned long xenbus_transaction_t;
 #ifdef CONFIG_XENBUS
 /* Initialize the XenBus system. */
 void init_xenbus(void);
+void get_xenbus(void *p);
 #else
 static inline void init_xenbus(void)
 {
 }
+static inline void get_xenbus(void *p)
+{
+}
 #endif
 
 /* Read the value associated with a path.  Returns a malloc'd error
@@ -31,7 +35,6 @@ typedef struct xenbus_event *xenbus_event_queue;
 
 extern uint32_t xenbus_evtchn;
 
-void get_xenbus(void *p);
 char *xenbus_watch_path_token(xenbus_transaction_t xbt, const char *path, const char *token, xenbus_event_queue *events);
 char *xenbus_unwatch_path_token(xenbus_transaction_t xbt, const char *path, const char *token);
 extern struct wait_queue_head xenbus_watch_queue;
-- 
2.6.6


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Re: [PATCH v2 1/2] mini-os: partially revert "remove using start_info ..."

[Samuel Thibault]

Hello,

Juergen Gross, on Mon 29 Aug 2016 16:18:26 +0200, wrote:
> +union start_info_union
> +{
> +    start_info_t start_info;
> +    char padding[512];
> +};

Why defining a union? 512 is actually not enough for start_info_t.

Samuel

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Re: [PATCH v2 1/2] mini-os: partially revert "remove using start_info ..."

[Samuel Thibault]

Samuel Thibault, on Mon 29 Aug 2016 22:49:07 +0200, wrote:
> Juergen Gross, on Mon 29 Aug 2016 16:18:26 +0200, wrote:
> > +union start_info_union
> > +{
> > +    start_info_t start_info;
> > +    char padding[512];
> > +};
> 
> Why defining a union? 512 is actually not enough for start_info_t.

Ah, sorry, that was already there :)

Samuel

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Re: [PATCH v2 1/2] mini-os: partially revert "remove using start_info ..."

[Samuel Thibault]

Juergen Gross, on Mon 29 Aug 2016 16:18:26 +0200, wrote:
> Commit e33452c4f5547ed14defe6382b3b53664ac5bd8a ("remove using
> start_info in architecture independent code") removed the start_info
> variable completely. grub stubdom needs the start_info structure.
> 
> Readd the start_info structure, but make it dependent on
> CONFIG_PARAVIRT.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

> ---
>  arch/x86/setup.c     | 12 ++++++++++++
>  include/hypervisor.h | 13 ++++++++++++-
>  2 files changed, 24 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/setup.c b/arch/x86/setup.c
> index 86955cf..5278227 100644
> --- a/arch/x86/setup.c
> +++ b/arch/x86/setup.c
> @@ -33,6 +33,14 @@
>  #include <xen/arch-x86/cpuid.h>
>  #include <xen/arch-x86/hvm/start_info.h>
>  
> +#ifdef CONFIG_PARAVIRT
> +/*
> + * This structure contains start-of-day info, such as pagetable base pointer,
> + * address of the shared_info structure, and things like that.
> + */
> +union start_info_union start_info_union;
> +#endif
> +
>  /*
>   * Shared page for communicating with the hypervisor.
>   * Events flags go here, for example.
> @@ -189,6 +197,10 @@ arch_init(void *par)
>  	/* print out some useful information  */
>  	print_start_of_day(par);
>  
> +#ifdef CONFIG_PARAVIRT
> +	memcpy(&start_info, par, sizeof(start_info));
> +#endif
> +
>  	start_kernel();
>  }
>  
> diff --git a/include/hypervisor.h b/include/hypervisor.h
> index 3073a8a..f3b1f3c 100644
> --- a/include/hypervisor.h
> +++ b/include/hypervisor.h
> @@ -27,7 +27,18 @@
>  #include <mini-os/traps.h>
>  
>  /* hypervisor.c */
> -#ifndef CONFIG_PARAVIRT
> +#ifdef CONFIG_PARAVIRT
> +/*
> + * a placeholder for the start of day information passed up from the hypervisor
> + */
> +union start_info_union
> +{
> +    start_info_t start_info;
> +    char padding[512];
> +};
> +extern union start_info_union start_info_union;
> +#define start_info (start_info_union.start_info)
> +#else
>  int hvm_get_parameter(int idx, uint64_t *value);
>  int hvm_set_parameter(int idx, uint64_t value);
>  #endif
> -- 
> 2.6.6
> 

-- 
Samuel
 FYLG> Tiens, vlà une URL qui va bien :
 FYLG> ftp://127.0.0.1/WaReZ/NiouZeS/WinDoZe/NeWSMoNGeR/SuPeR
 c'est gentil sauf que l'adresse ne fonctionne pas sa me fais une erreur
 -+- Furtif in Guide du Neuneu Usenet : <MODE CERVEAU OFF> -+-

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Re: [PATCH v2 0/2] mini-os: repair stubdom build

[Wei Liu]

On Mon, Aug 29, 2016 at 04:18:25PM +0200, Juergen Gross wrote:
> The patch series adding HVMlite support for Mini-OS unfortunately
> broke building Xen's stubdoms. This small series repairs the broken
> bits again.
> 
> V2: patch 1: remove CONFIG_KEEP_STARTINFO
> 
> Juergen Gross (2):
>   mini-os: partially revert "remove using start_info ..."
>   mini-os: don't get xenbus parameters if xenbus is disabled
> 

Pushed.

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