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fix qemu exit on memory hotplug when allocation fails at prealloc time

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When adding hostmem backend at runtime, QEMU might exit with error:
  "os_mem_prealloc: Insufficient free host memory pages available to allocate guest RAM"

It happens due to os_mem_prealloc() not handling errors gracefully.

Fix it by passing errp argument so that os_mem_prealloc() could
report error to callers and undo performed allocation when
os_mem_prealloc() fails.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1469008443-72059-1-git-send-email-imammedo@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Igor Mammedov 2016-07-20 11:54:03 +02:00 • committed by Paolo Bonzini
parent 0b21757124
commit 056b68af77
5 changed files with 38 additions and 22 deletions
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2
util/oslib-win32.c
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@ -539,7 +539,7 @@ int getpagesize(void)
return system_info.dwPageSize;
}
void os_mem_prealloc(int fd, char *area, size_t memory)
void os_mem_prealloc(int fd, char *area, size_t memory, Error **errp)
{
int i;
size_t pagesize = getpagesize();