Re: [Xen-devel] [bug] pv-grub doesn't run on rhel5

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>]

Samuel Thibault, le Thu 14 Aug 2008 16:14:00 +0100, a écrit :
> Gerd Hoffmann, le Thu 14 Aug 2008 17:04:07 +0200, a écrit :
> > Uhm, well, no way to fix minios to run on older xen versions then I
> > guess (which I'd prefer).  Except maybe limiting the 32bit version to
> > 1GB address space.  Which should be fine at least for pvgrub ...
> 
> That should be feasible indeed.

As seen below.  I'm not sure whether we want that into mainline Xen 3.3
however?

BTW, Keir commited the 32on64 pv-grub build, it should appear after the
regression tests.

Samuel



pv-grub: limit address space usage to less than a GB so as to be
runnable on xen hypervisor revisions earlier than c/s 17061.

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>

diff -r 38783464a671 extras/mini-os/arch/x86/mm.c
--- a/extras/mini-os/arch/x86/mm.c      Thu Aug 14 16:16:44 2008 +0100
+++ b/extras/mini-os/arch/x86/mm.c      Thu Aug 14 16:30:59 2008 +0100
@@ -414,18 +414,22 @@ pgentry_t *need_pgt(unsigned long addr)
 }
 
 static unsigned long demand_map_area_start;
+#ifndef DEMAND_MAP_PAGES
 #ifdef __x86_64__
 #define DEMAND_MAP_PAGES ((128ULL << 30) / PAGE_SIZE)
 #else
 #define DEMAND_MAP_PAGES ((2ULL << 30) / PAGE_SIZE)
 #endif
+#endif
 
 #ifdef HAVE_LIBC
 unsigned long heap, brk, heap_mapped, heap_end;
+#ifndef HEAP_PAGES
 #ifdef __x86_64__
 #define HEAP_PAGES ((128ULL << 30) / PAGE_SIZE)
 #else
 #define HEAP_PAGES ((1ULL << 30) / PAGE_SIZE)
+#endif
 #endif
 #endif
 
diff -r 38783464a671 stubdom/Makefile
--- a/stubdom/Makefile  Thu Aug 14 16:16:44 2008 +0100
+++ b/stubdom/Makefile  Thu Aug 14 16:30:59 2008 +0100
@@ -33,6 +33,7 @@ TARGET_CFLAGS=
 TARGET_CFLAGS=
 NEWLIB_CFLAGS+=-D_I386MACH_ALLOW_HW_INTERRUPTS
 STUBDOM_SUPPORTED=1
+PVGRUB_CPPFLAGS=-DDEMAND_MAP_PAGES='((256ULL << 20) / PAGE_SIZE)' 
-DHEAP_PAGES='((256ULL << 20) / PAGE_SIZE)'
 endif
 ifeq ($(GNU_TARGET_ARCH), x86_64)
 TARGET_CFLAGS=-mno-red-zone
@@ -296,7 +297,7 @@ c-stubdom: mini-os-$(XEN_TARGET_ARCH)-c 
 
 .PHONY: pv-grub
 pv-grub: mini-os-$(XEN_TARGET_ARCH)-grub libxc grub
-       DEF_CPPFLAGS="$(TARGET_CPPFLAGS)" DEF_CFLAGS="-DCONFIG_GRUB 
$(TARGET_CFLAGS)" DEF_LDFLAGS="$(TARGET_LDFLAGS)" $(MAKE) -C $(MINI_OS) 
OBJ_DIR=$(CURDIR)/$< APP_OBJS=$(CURDIR)/grub-$(XEN_TARGET_ARCH)/main.a
+       DEF_CPPFLAGS="$(TARGET_CPPFLAGS) $(PVGRUB_CPPFLAGS)" 
DEF_CFLAGS="-DCONFIG_GRUB $(TARGET_CFLAGS)" DEF_LDFLAGS="$(TARGET_LDFLAGS)" 
$(MAKE) -C $(MINI_OS) OBJ_DIR=$(CURDIR)/$< 
APP_OBJS=$(CURDIR)/grub-$(XEN_TARGET_ARCH)/main.a
 
 #########
 # install

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