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[Xen-devel] [PATCH v3 07/15] xen/x86: p2m-pod: Use typesafe gfn in p2m_pod_decrease_reservation

From: Julien Grall <julien.grall@xxxxxxx>

Date: Mon, 2 Oct 2017 13:59:33 +0100

Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>

Delivery-date: Mon, 02 Oct 2017 13:00:02 +0000

List-id: Xen developer discussion <xen-devel.lists.xen.org>

Signed-off-by: Julien Grall <julien.grall@xxxxxxx> Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx> Acked-by: George Dunlap <george.dunlap@xxxxxxxxxx> --- Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx> Cc: Jan Beulich <jbeulich@xxxxxxxx> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Changes in v2: - Add Andrew's acked-by --- xen/arch/arm/p2m.c | 3 +-- xen/arch/x86/mm/p2m-pod.c | 20 +++++++++----------- xen/common/memory.c | 3 ++- xen/include/asm-arm/p2m.h | 13 ------------- xen/include/asm-x86/p2m.h | 7 ------- xen/include/xen/p2m-common.h | 13 +++++++++++++ 6 files changed, 25 insertions(+), 34 deletions(-) diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c index 192a1c329d..0410b1e86b 100644 --- a/xen/arch/arm/p2m.c +++ b/xen/arch/arm/p2m.c @@ -393,8 +393,7 @@ int guest_physmap_mark_populate_on_demand(struct domain *d, return -ENOSYS; } -int p2m_pod_decrease_reservation(struct domain *d, - xen_pfn_t gpfn, +int p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn, unsigned int order) { return -ENOSYS; diff --git a/xen/arch/x86/mm/p2m-pod.c b/xen/arch/x86/mm/p2m-pod.c index 34f5239b6d..eb74e5c01f 100644 --- a/xen/arch/x86/mm/p2m-pod.c +++ b/xen/arch/x86/mm/p2m-pod.c @@ -511,9 +511,7 @@ p2m_pod_zero_check_superpage(struct p2m_domain *p2m, unsigned long gfn); * allow decrease_reservation() to handle everything else. */ int -p2m_pod_decrease_reservation(struct domain *d, - xen_pfn_t gpfn, - unsigned int order) +p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn, unsigned int order) { int ret = 0; unsigned long i, n; @@ -521,7 +519,7 @@ p2m_pod_decrease_reservation(struct domain *d, bool_t steal_for_cache; long pod, nonpod, ram; - gfn_lock(p2m, gpfn, order); + gfn_lock(p2m, gfn, order); pod_lock(p2m); /* @@ -545,7 +543,7 @@ p2m_pod_decrease_reservation(struct domain *d, p2m_type_t t; unsigned int cur_order; - p2m->get_entry(p2m, gpfn + i, &t, &a, 0, &cur_order, NULL); + p2m->get_entry(p2m, gfn_x(gfn) + i, &t, &a, 0, &cur_order, NULL); n = 1UL << min(order, cur_order); if ( t == p2m_populate_on_demand ) pod += n; @@ -567,7 +565,7 @@ p2m_pod_decrease_reservation(struct domain *d, * All PoD: Mark the whole region invalid and tell caller * we're done. */ - p2m_set_entry(p2m, gpfn, INVALID_MFN, order, p2m_invalid, + p2m_set_entry(p2m, gfn_x(gfn), INVALID_MFN, order, p2m_invalid, p2m->default_access); p2m->pod.entry_count -= 1UL << order; BUG_ON(p2m->pod.entry_count < 0); @@ -584,7 +582,7 @@ p2m_pod_decrease_reservation(struct domain *d, * - not all of the pages were RAM (now knowing order < SUPERPAGE_ORDER) */ if ( steal_for_cache && order < SUPERPAGE_ORDER && ram == (1UL << order) && - p2m_pod_zero_check_superpage(p2m, gpfn & ~(SUPERPAGE_PAGES - 1)) ) + p2m_pod_zero_check_superpage(p2m, gfn_x(gfn) & ~(SUPERPAGE_PAGES - 1)) ) { pod = 1UL << order; ram = nonpod = 0; @@ -605,13 +603,13 @@ p2m_pod_decrease_reservation(struct domain *d, p2m_access_t a; unsigned int cur_order; - mfn = p2m->get_entry(p2m, gpfn + i, &t, &a, 0, &cur_order, NULL); + mfn = p2m->get_entry(p2m, gfn_x(gfn) + i, &t, &a, 0, &cur_order, NULL); if ( order < cur_order ) cur_order = order; n = 1UL << cur_order; if ( t == p2m_populate_on_demand ) { - p2m_set_entry(p2m, gpfn + i, INVALID_MFN, cur_order, + p2m_set_entry(p2m, gfn_x(gfn) + i, INVALID_MFN, cur_order, p2m_invalid, p2m->default_access); p2m->pod.entry_count -= n; BUG_ON(p2m->pod.entry_count < 0); @@ -633,7 +631,7 @@ p2m_pod_decrease_reservation(struct domain *d, page = mfn_to_page(mfn); - p2m_set_entry(p2m, gpfn + i, INVALID_MFN, cur_order, + p2m_set_entry(p2m, gfn_x(gfn) + i, INVALID_MFN, cur_order, p2m_invalid, p2m->default_access); p2m_tlb_flush_sync(p2m); for ( j = 0; j < n; ++j ) @@ -663,7 +661,7 @@ out_entry_check: out_unlock: pod_unlock(p2m); - gfn_unlock(p2m, gpfn, order); + gfn_unlock(p2m, gfn, order); return ret; } diff --git a/xen/common/memory.c b/xen/common/memory.c index a2abf554e3..ad987e0f29 100644 --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -417,7 +417,8 @@ static void decrease_reservation(struct memop_args *a) /* See if populate-on-demand wants to handle this */ if ( is_hvm_domain(a->domain) - && p2m_pod_decrease_reservation(a->domain, gmfn, a->extent_order) ) + && p2m_pod_decrease_reservation(a->domain, _gfn(gmfn), + a->extent_order) ) continue; for ( j = 0; j < (1 << a->extent_order); j++ ) diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h index bc5bbf0db7..faadcfe8fe 100644 --- a/xen/include/asm-arm/p2m.h +++ b/xen/include/asm-arm/p2m.h @@ -266,19 +266,6 @@ static inline int guest_physmap_add_page(struct domain *d, mfn_t gfn_to_mfn(struct domain *d, gfn_t gfn); -/* - * Populate-on-demand - */ - -/* - * Call when decreasing memory reservation to handle PoD entries properly. - * Will return '1' if all entries were handled and nothing more need be done. - */ -int -p2m_pod_decrease_reservation(struct domain *d, - xen_pfn_t gpfn, - unsigned int order); - /* Look up a GFN and take a reference count on the backing page. */ typedef unsigned int p2m_query_t; #define P2M_ALLOC (1u<<0) /* Populate PoD and paged-out entries */ diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h index 10cdfc09a9..8f3409b400 100644 --- a/xen/include/asm-x86/p2m.h +++ b/xen/include/asm-x86/p2m.h @@ -643,13 +643,6 @@ int p2m_pod_empty_cache(struct domain *d); * domain matches target */ int p2m_pod_set_mem_target(struct domain *d, unsigned long target); -/* Call when decreasing memory reservation to handle PoD entries properly. - * Will return '1' if all entries were handled and nothing more need be done.*/ -int -p2m_pod_decrease_reservation(struct domain *d, - xen_pfn_t gpfn, - unsigned int order); - /* Scan pod cache when offline/broken page triggered */ int p2m_pod_offline_or_broken_hit(struct page_info *p); diff --git a/xen/include/xen/p2m-common.h b/xen/include/xen/p2m-common.h index 2b5696cf33..27f89208f5 100644 --- a/xen/include/xen/p2m-common.h +++ b/xen/include/xen/p2m-common.h @@ -20,4 +20,17 @@ int unmap_mmio_regions(struct domain *d, unsigned long nr, mfn_t mfn); +/* + * Populate-on-Demand + */ + +/* + * Call when decreasing memory reservation to handle PoD entries properly. + * Will return '1' if all entries were handled and nothing more need be done. + */ +int +p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn, + unsigned int order); + + #endif /* _XEN_P2M_COMMON_H */ -- 2.11.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel

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