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openSUSE:Evergreen:11.1
xen
20508-shadow-teardown-p2m.patch
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File 20508-shadow-teardown-p2m.patch of Package xen
# HG changeset patch # User Keir Fraser <keir.fraser@citrix.com> # Date 1259235076 0 # Node ID e6515469c466f5c43a0927d72129a3ecd2289cb7 # Parent a92e9fa2639d13f859c82a3ac255fb3c54226688 x86 shadow: don't try to unsshadow for p2m changes after the shadows have been torn down. Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com> --- a/xen/arch/x86/mm/shadow/common.c +++ b/xen/arch/x86/mm/shadow/common.c @@ -3344,14 +3344,12 @@ static int shadow_test_disable(struct do * with new content. It is responsible for update the entry, as well as other * shadow processing jobs. */ -void -shadow_write_p2m_entry(struct vcpu *v, unsigned long gfn, - l1_pgentry_t *p, mfn_t table_mfn, - l1_pgentry_t new, unsigned int level) + +static void sh_unshadow_for_p2m_change(struct vcpu *v, unsigned long gfn, + l1_pgentry_t *p, mfn_t table_mfn, + l1_pgentry_t new, unsigned int level) { struct domain *d = v->domain; - - shadow_lock(d); /* If we're removing an MFN from the p2m, remove it from the shadows too */ if ( level == 1 ) @@ -3407,6 +3405,21 @@ shadow_write_p2m_entry(struct vcpu *v, u unmap_domain_page(npte); } } +} + +void +shadow_write_p2m_entry(struct vcpu *v, unsigned long gfn, + l1_pgentry_t *p, mfn_t table_mfn, + l1_pgentry_t new, unsigned int level) +{ + struct domain *d = v->domain; + + shadow_lock(d); + + /* If there are any shadows, update them. But if shadow_teardown() + * has already been called then it's not safe to try. */ + if ( likely(d->arch.paging.shadow.total_pages != 0) ) + sh_unshadow_for_p2m_change(v, gfn, p, table_mfn, new, level); /* Update the entry with new content */ safe_write_pte(p, new);
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