[XEN] Extend dom0_mem syntax to support min/max clamps.

dom0_mem=[min:<min_amt>,][max:<max_amt>,][<amt>]

<min_amt>: The minimum amount of memory which should be allocated for dom0.
<max_amt>: The maximum amount of memory which should be allocated for dom0.
<amt>:     The precise amount of memory to allocate for dom0.

Notes:
 1. <amt> is clamped from below by <min_amt> and from above by available
    memory and <max_amt>
 2. <min_amt> is clamped from above by available memory and <max_amt>
 3. <min_amt> is ignored if it is greater than <max_amt>
 4. If <amt> is not specified, it is calculated as follows:
    "All of memory is allocated to domain 0, minus 1/16th which is reserved
     for uses such as DMA buffers (the reservation is clamped to 128MB)."

Each value can be specified as positive or negative:
 If +ve: The specified amount is an absolute value.
 If -ve: The specified amount is subtracted from total available memory.

Signed-off-by: Keir Fraser <keir@xensource.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/xen/arch/x86/e820.c b/xen/arch/x86/e820.c
index bbc147139c..b12eb68c87 100644
--- a/xen/arch/x86/e820.c
+++ b/xen/arch/x86/e820.c
@@ -6,7 +6,7 @@
 
 /* opt_mem: Limit of physical RAM. Any RAM beyond this point is ignored. */
 unsigned long long opt_mem;
-static void parse_mem(char *s) { opt_mem = parse_size_and_unit(s); }
+static void parse_mem(char *s) { opt_mem = parse_size_and_unit(s, NULL); }
 custom_param("mem", parse_mem);
 
 struct e820map e820;