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55c3232b-x86-mm-Make-hap-shadow-teardown-preemp...
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File 55c3232b-x86-mm-Make-hap-shadow-teardown-preemptible.patch of Package xen
# Commit 0174da5b79752e2d5d6ca0faed89536e8f3d91c7 # Date 2015-08-06 10:04:43 +0100 # Author Anshul Makkar <anshul.makkar@citrix.com> # Committer Ian Campbell <ian.campbell@citrix.com> x86/mm: Make {hap, shadow}_teardown() preemptible A domain with sufficient shadow allocation can cause a watchdog timeout during domain destruction. Expand the existing -ERESTART logic in paging_teardown() to allow {hap/sh}_set_allocation() to become restartable during the DOMCTL_destroydomain hypercall. Signed-off-by: Anshul Makkar <anshul.makkar@citrix.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Tim Deegan <tim@xen.org> Reviewed-by: George Dunlap <george.dunlap@eu.citrix.com> --- a/xen/arch/x86/mm/hap/hap.c +++ b/xen/arch/x86/mm/hap/hap.c @@ -503,7 +503,7 @@ void hap_final_teardown(struct domain *d } if ( d->arch.paging.hap.total_pages != 0 ) - hap_teardown(d); + hap_teardown(d, NULL); p2m_teardown(p2m_get_hostp2m(d)); /* Free any memory that the p2m teardown released */ @@ -513,7 +513,7 @@ void hap_final_teardown(struct domain *d paging_unlock(d); } -void hap_teardown(struct domain *d) +void hap_teardown(struct domain *d, int *preempted) { struct vcpu *v; mfn_t mfn; @@ -541,18 +541,11 @@ void hap_teardown(struct domain *d) if ( d->arch.paging.hap.total_pages != 0 ) { - HAP_PRINTK("teardown of domain %u starts." - " pages total = %u, free = %u, p2m=%u\n", - d->domain_id, - d->arch.paging.hap.total_pages, - d->arch.paging.hap.free_pages, - d->arch.paging.hap.p2m_pages); - hap_set_allocation(d, 0, NULL); - HAP_PRINTK("teardown done." - " pages total = %u, free = %u, p2m=%u\n", - d->arch.paging.hap.total_pages, - d->arch.paging.hap.free_pages, - d->arch.paging.hap.p2m_pages); + hap_set_allocation(d, 0, preempted); + + if ( preempted && *preempted ) + goto out; + ASSERT(d->arch.paging.hap.total_pages == 0); } @@ -561,6 +554,7 @@ void hap_teardown(struct domain *d) xfree(d->arch.hvm_domain.dirty_vram); d->arch.hvm_domain.dirty_vram = NULL; +out: paging_unlock(d); } --- a/xen/arch/x86/mm/paging.c +++ b/xen/arch/x86/mm/paging.c @@ -779,12 +779,15 @@ long paging_domctl_continuation(XEN_GUES /* Call when destroying a domain */ int paging_teardown(struct domain *d) { - int rc; + int rc, preempted = 0; if ( hap_enabled(d) ) - hap_teardown(d); + hap_teardown(d, &preempted); else - shadow_teardown(d); + shadow_teardown(d, &preempted); + + if ( preempted ) + return -ERESTART; /* clean up log dirty resources. */ rc = paging_free_log_dirty_bitmap(d, 0); --- a/xen/arch/x86/mm/shadow/common.c +++ b/xen/arch/x86/mm/shadow/common.c @@ -3030,7 +3030,7 @@ int shadow_enable(struct domain *d, u32 return rv; } -void shadow_teardown(struct domain *d) +void shadow_teardown(struct domain *d, int *preempted) /* Destroy the shadow pagetables of this domain and free its shadow memory. * Should only be called for dying domains. */ { @@ -3091,23 +3091,16 @@ void shadow_teardown(struct domain *d) if ( d->arch.paging.shadow.total_pages != 0 ) { - SHADOW_PRINTK("teardown of domain %u starts." - " Shadow pages total = %u, free = %u, p2m=%u\n", - d->domain_id, - d->arch.paging.shadow.total_pages, - d->arch.paging.shadow.free_pages, - d->arch.paging.shadow.p2m_pages); /* Destroy all the shadows and release memory to domheap */ - sh_set_allocation(d, 0, NULL); + sh_set_allocation(d, 0, preempted); + + if ( preempted && *preempted ) + goto out; + /* Release the hash table back to xenheap */ if (d->arch.paging.shadow.hash_table) shadow_hash_teardown(d); - /* Should not have any more memory held */ - SHADOW_PRINTK("teardown done." - " Shadow pages total = %u, free = %u, p2m=%u\n", - d->arch.paging.shadow.total_pages, - d->arch.paging.shadow.free_pages, - d->arch.paging.shadow.p2m_pages); + ASSERT(d->arch.paging.shadow.total_pages == 0); } @@ -3138,6 +3131,7 @@ void shadow_teardown(struct domain *d) d->arch.hvm_domain.dirty_vram = NULL; } +out: paging_unlock(d); /* Must be called outside the lock */ @@ -3159,7 +3153,7 @@ void shadow_final_teardown(struct domain * It is possible for a domain that never got domain_kill()ed * to get here with its shadow allocation intact. */ if ( d->arch.paging.shadow.total_pages != 0 ) - shadow_teardown(d); + shadow_teardown(d, NULL); /* It is now safe to pull down the p2m map. */ p2m_teardown(p2m_get_hostp2m(d)); --- a/xen/include/asm-x86/hap.h +++ b/xen/include/asm-x86/hap.h @@ -54,7 +54,7 @@ int hap_domctl(struct domain *d, xen_d XEN_GUEST_HANDLE_PARAM(void) u_domctl); int hap_enable(struct domain *d, u32 mode); void hap_final_teardown(struct domain *d); -void hap_teardown(struct domain *d); +void hap_teardown(struct domain *d, int *preempted); void hap_vcpu_init(struct vcpu *v); int hap_track_dirty_vram(struct domain *d, unsigned long begin_pfn, --- a/xen/include/asm-x86/shadow.h +++ b/xen/include/asm-x86/shadow.h @@ -72,7 +72,7 @@ int shadow_domctl(struct domain *d, XEN_GUEST_HANDLE_PARAM(void) u_domctl); /* Call when destroying a domain */ -void shadow_teardown(struct domain *d); +void shadow_teardown(struct domain *d, int *preempted); /* Call once all of the references to the domain have gone away */ void shadow_final_teardown(struct domain *d);
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