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| author | Keir Fraser <keir.fraser@citrix.com> | 2010-01-14 14:11:25 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2010-01-14 14:11:25 +0000 |
| commit | 46785b54f8cda84811f02bdeee8d9bd780fa29dc (patch) | |
| tree | eeabd87649980f095a69c8375b2ae793f7fd12a3 | |
| parent | 2d8eb0f62d39abc9d1a49a808f1e69169ea23212 (diff) | |
| download | xen-46785b54f8cda84811f02bdeee8d9bd780fa29dc.tar.gz xen-46785b54f8cda84811f02bdeee8d9bd780fa29dc.tar.bz2 xen-46785b54f8cda84811f02bdeee8d9bd780fa29dc.zip | |
Make sure the minimum shadow allocation is never zero.
Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com>
| -rw-r--r-- | xen/arch/x86/mm/shadow/common.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c index 434d567536..5e37bb01d4 100644 --- a/xen/arch/x86/mm/shadow/common.c +++ b/xen/arch/x86/mm/shadow/common.c @@ -1244,10 +1244,11 @@ int shadow_cmpxchg_guest_entry(struct vcpu *v, intpte_t *p, * instruction, we must be able to map a large number (about thirty) VAs * at the same time, which means that to guarantee progress, we must * allow for more than ninety allocated pages per vcpu. We round that - * up to 128 pages, or half a megabyte per vcpu. */ + * up to 128 pages, or half a megabyte per vcpu, and add 1 more vcpu's + * worth to make sure we never return zero. */ static unsigned int shadow_min_acceptable_pages(struct domain *d) { - u32 vcpu_count = 0; + u32 vcpu_count = 1; struct vcpu *v; for_each_vcpu(d, v) |