[xen staging] tools/xl: fix autoballoon regex

[patchbot@xxxxxxx]

commit 2faeb4213d9b412836fe80e5685bfcccc51feb92
Author:     Dmitry Isaykin <isaikin-dmitry@xxxxxxxxx>
AuthorDate: Fri Oct 1 15:24:16 2021 +0300
Commit:     Ian Jackson <iwj@xxxxxxxxxxxxxx>
CommitDate: Tue Oct 12 14:40:14 2021 +0100

    tools/xl: fix autoballoon regex
    
    This regex is used for auto-balloon mode detection based on Xen command 
line.
    
    The case of specifying a negative size was handled incorrectly.
    >From misc/xen-command-line documentation:
    
        dom0_mem (x86)
        = List of ( min:<sz> | max:<sz> | <sz> )
    
        If a size is positive, it represents an absolute value.
        If a size is negative, it is subtracted from the total available memory.
    
    Also add support for [tT] granularity suffix.
    Also add support for memory fractions (i.e. '50%' or '1G+25%').
    
    Signed-off-by: Dmitry Isaykin <isaikin-dmitry@xxxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/xl/xl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/xl/xl.c b/tools/xl/xl.c
index 4107d10fd4..f422f9fed5 100644
--- a/tools/xl/xl.c
+++ b/tools/xl/xl.c
@@ -80,14 +80,20 @@ static int auto_autoballoon(void)
     if (!info)
         return 1; /* default to on */
 
+#define SIZE_PATTERN "-?[0-9]+[bBkKmMgGtT]?"
+
     ret = regcomp(&regex,
-                  "(^| )dom0_mem=((|min:|max:)[0-9]+[bBkKmMgG]?,?)+($| )",
+                  "(^| )dom0_mem=((|min:|max:)(" SIZE_PATTERN "|(" 
SIZE_PATTERN "\\+)?[0-9]{1,2}%),?)+($| )",
                   REG_NOSUB | REG_EXTENDED);
+
+#undef SIZE_PATTERN
+
     if (ret)
         return 1;
 
     ret = regexec(&regex, info->commandline, 0, NULL, 0);
     regfree(&regex);
+
     return ret == REG_NOMATCH;
 }
 
--
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