[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH for-next v2 01/10] x86/mm: make free_perdomain_mappings idempotent
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx> --- Cc: Tim Deegan <tim@xxxxxxx> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx> Cc: Jan Beulich <jbeulich@xxxxxxxx> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> --- xen/arch/x86/mm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c index bd68e56dc7..cdef5c49c4 100644 --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -6503,9 +6503,14 @@ void destroy_perdomain_mapping(struct domain *d, unsigned long va, void free_perdomain_mappings(struct domain *d) { - l3_pgentry_t *l3tab = __map_domain_page(d->arch.perdomain_l3_pg); + l3_pgentry_t *l3tab; unsigned int i; + if ( !d->arch.perdomain_l3_pg ) + return; + + l3tab = __map_domain_page(d->arch.perdomain_l3_pg); + for ( i = 0; i < PERDOMAIN_SLOTS; ++i) if ( l3e_get_flags(l3tab[i]) & _PAGE_PRESENT ) { @@ -6544,6 +6549,7 @@ void free_perdomain_mappings(struct domain *d) unmap_domain_page(l3tab); free_domheap_page(d->arch.perdomain_l3_pg); + d->arch.perdomain_l3_pg = NULL; } #ifdef MEMORY_GUARD -- 2.11.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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