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authorIan Campbell <ian.campbell@citrix.com>2012-10-03 12:17:50 +0100
committerIan Campbell <ian.campbell@citrix.com>2012-11-29 12:59:13 +0000
commitc2374bf57e7861039bb129ead538515502ef7860 (patch)
tree3b32e9891ec0b133e676c4cc5cf9617499310725
parentd71f513985c22f1050295d1a7e4327cf9fb060da (diff)
xen: balloon: allow PVMMU interfaces to be compiled out
The ARM platform has no concept of PVMMU and therefor no HYPERVISOR_update_va_mapping et al. Allow this code to be compiled out when not required. In some similar situations (e.g. P2M) we have defined dummy functions to avoid this, however I think we can/should draw the line at dummying out actual hypercalls. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
-rw-r--r--arch/x86/xen/Kconfig1
-rw-r--r--drivers/xen/Kconfig3
-rw-r--r--drivers/xen/balloon.c5
3 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index fdce49c7aff6..c31ee77e1ec1 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -6,6 +6,7 @@ config XEN
bool "Xen guest support"
select PARAVIRT
select PARAVIRT_CLOCK
+ select XEN_HAVE_PVMMU
depends on X86_64 || (X86_32 && X86_PAE && !X86_VISWS)
depends on X86_CMPXCHG && X86_TSC
help
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 126d8ce591ce..cabfa97f4674 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -206,4 +206,7 @@ config XEN_MCE_LOG
Allow kernel fetching MCE error from Xen platform and
converting it into Linux mcelog format for mcelog tools
+config XEN_HAVE_PVMMU
+ bool
+
endmenu
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index d6886d90ccfd..a56776dbe095 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -359,6 +359,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
set_phys_to_machine(pfn, frame_list[i]);
+#ifdef CONFIG_XEN_HAVE_PVMMU
/* Link back into the page tables if not highmem. */
if (xen_pv_domain() && !PageHighMem(page)) {
int ret;
@@ -368,6 +369,7 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
0);
BUG_ON(ret);
}
+#endif
/* Relinquish the page back to the allocator. */
ClearPageReserved(page);
@@ -416,13 +418,14 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
scrub_page(page);
+#ifdef CONFIG_XEN_HAVE_PVMMU
if (xen_pv_domain() && !PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
(unsigned long)__va(pfn << PAGE_SHIFT),
__pte_ma(0), 0);
BUG_ON(ret);
}
-
+#endif
}
/* Ensure that ballooned highmem pages don't have kmaps. */