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SUSE:SLE-12-SP4:Update
xen.17654
xsa299-9.patch
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File xsa299-9.patch of Package xen.17654
From 4e0388af70146faaef6443a8b57807cd61e0960f Mon Sep 17 00:00:00 2001 From: George Dunlap <george.dunlap@citrix.com> Date: Thu, 10 Oct 2019 17:57:49 +0100 Subject: [PATCH 09/12] x86/mm: Collapse PTF_partial_set and PTF_partial_general_ref into one ...now that they are equivalent. No functional change intended. Reported-by: George Dunlap <george.dunlap@citrix.com> Signed-off-by: George Dunlap <george.dunlap@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- xen/arch/x86/mm.c | 50 +++++++++++----------------------------- xen/include/asm-x86/mm.h | 29 +++++++++++------------ 2 files changed, 26 insertions(+), 53 deletions(-) --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -757,13 +757,12 @@ static int __get_page_type(struct page_i /* * The following flags are used to specify behavior of various get and - * put commands. The first two are also stored in page->partial_flags - * to indicate the state of the page pointed to by + * put commands. The first is also stored in page->partial_flags to + * indicate the state of the page pointed to by * page->pte[page->nr_validated_entries]. See the comment in mm.h for * more information. */ #define PTF_partial_set (1 << 0) -#define PTF_partial_general_ref (1 << 1) #define PTF_preemptible (1 << 2) #define PTF_defer (1 << 3) #define PTF_retain_ref_on_restart (1 << 4) @@ -776,13 +775,10 @@ static int get_page_and_type_from_pagenr struct page_info *page = mfn_to_page(page_nr); int rc; bool_t preemptible = !!(flags & PTF_preemptible), - partial_ref = !!(flags & PTF_partial_general_ref), partial_set = !!(flags & PTF_partial_set), retain_ref = !!(flags & PTF_retain_ref_on_restart); - ASSERT(partial_ref == partial_set); - - if ( likely(!partial_ref) && + if ( likely(!partial_set) && unlikely(!get_page_from_pagenr(page_nr, d)) ) return -EINVAL; @@ -792,14 +788,14 @@ static int get_page_and_type_from_pagenr * Retain the refcount if: * - page is fully validated (rc == 0) * - page is not validated (rc < 0) but: - * - We came in with a reference (partial_ref) + * - We came in with a reference (partial_set) * - page is partially validated (rc == -ERESTART), and the * caller has asked the ref to be retained in that case * - page is partially validated but there's been an error * (page == current->arch.old_guest_table) * - * The partial_ref-on-error clause is worth an explanation. There - * are two scenarios where partial_ref might be true coming in: + * The partial_set-on-error clause is worth an explanation. There + * are two scenarios where partial_set might be true coming in: * - mfn has been partially promoted / demoted as type `type`; * i.e. has PGT_partial set * - mfn has been partially demoted as L(type+1) (i.e., a linear @@ -822,7 +818,7 @@ static int get_page_and_type_from_pagenr * count retained unless we succeeded, or the operation was * preemptible. */ - if ( likely(!rc) || partial_ref ) + if ( likely(!rc) || partial_set ) /* nothing */; else if ( page == current->arch.old_guest_table || (retain_ref && rc == -ERESTART) ) @@ -1513,13 +1509,7 @@ static int put_page_from_l2e(l2_pgentry_ struct page_info *pg = l2e_get_page(l2e); struct page_info *ptpg = mfn_to_page(pfn); - if ( (flags & (PTF_partial_set | PTF_partial_general_ref)) == - PTF_partial_set ) - { - /* partial_set should always imply partial_ref */ - BUG(); - } - else if ( flags & PTF_defer ) + if ( flags & PTF_defer ) { current->arch.old_guest_ptpg = ptpg; current->arch.old_guest_table = pg; @@ -1559,13 +1549,6 @@ static int put_page_from_l3e(l3_pgentry_ pg = l3e_get_page(l3e); - if ( (flags & (PTF_partial_set | PTF_partial_general_ref)) == - PTF_partial_set ) - { - /* partial_set should always imply partial_ref */ - BUG(); - } - if ( flags & PTF_defer ) { current->arch.old_guest_ptpg = mfn_to_page(pfn); @@ -1590,13 +1573,6 @@ static int put_page_from_l4e(l4_pgentry_ { struct page_info *pg = l4e_get_page(l4e); - if ( (flags & (PTF_partial_set | PTF_partial_general_ref)) == - PTF_partial_set ) - { - /* partial_set should always imply partial_ref */ - BUG(); - } - if ( flags & PTF_defer ) { current->arch.old_guest_ptpg = mfn_to_page(pfn); @@ -1825,7 +1801,7 @@ static int alloc_l3_table(struct page_in { page->nr_validated_ptes = i; /* Set 'set', leave 'general ref' set if this entry was set */ - page->partial_flags = PTF_partial_set | PTF_partial_general_ref; + page->partial_flags = PTF_partial_set; } else if ( rc == -EINTR && i ) { @@ -1928,7 +1904,7 @@ static int alloc_l4_table(struct page_in { page->nr_validated_ptes = i; /* Set 'set', leave 'general ref' set if this entry was set */ - page->partial_flags = PTF_partial_set | PTF_partial_general_ref; + page->partial_flags = PTF_partial_set; } else if ( rc < 0 ) { @@ -2026,7 +2002,7 @@ static int free_l2_table(struct page_inf else if ( rc == -ERESTART ) { page->nr_validated_ptes = i; - page->partial_flags = PTF_partial_set | PTF_partial_general_ref; + page->partial_flags = PTF_partial_set; } else if ( rc == -EINTR && i < L2_PAGETABLE_ENTRIES - 1 ) { @@ -2077,7 +2053,7 @@ static int free_l3_table(struct page_inf if ( rc == -ERESTART ) { page->nr_validated_ptes = i; - page->partial_flags = PTF_partial_set | PTF_partial_general_ref; + page->partial_flags = PTF_partial_set; } else if ( rc == -EINTR && i < L3_PAGETABLE_ENTRIES - 1 ) { @@ -2108,7 +2084,7 @@ static int free_l4_table(struct page_inf if ( rc == -ERESTART ) { page->nr_validated_ptes = i; - page->partial_flags = PTF_partial_set | PTF_partial_general_ref; + page->partial_flags = PTF_partial_set; } else if ( rc == -EINTR && i < L4_PAGETABLE_ENTRIES - 1 ) { --- a/xen/include/asm-x86/mm.h +++ b/xen/include/asm-x86/mm.h @@ -146,7 +146,7 @@ struct page_info * operation on the current page. (That page may or may not * still have PGT_partial set.) * - * If PTF_partial_general_ref is set, then the PTE at + * Additionally, if PTF_partial_set is set, then the PTE at * @nr_validated_ptef holds a general reference count for the * page. * @@ -155,23 +155,20 @@ struct page_info * interrupted * - During validation, if an invalid entry is encountered and * validation is preemptible - * - During validation, if PTF_partial_general_ref was set on - * this entry to begin with (perhaps because it picked up a + * - During validation, if PTF_partial_set was set on this + * entry to begin with (perhaps because it picked up a * previous operation) * - * When resuming validation, if PTF_partial_general_ref is - * clear, then a general reference must be re-acquired; if it - * is set, no reference should be acquired. - * - * When resuming de-validation, if PTF_partial_general_ref is - * clear, no reference should be dropped; if it is set, a - * reference should be dropped. + * When resuming validation, if PTF_partial_set is clear, then + * a general reference must be re-acquired; if it is set, no + * reference should be acquired. + * + * When resuming de-validation, if PTF_partial_set is clear, + * no reference should be dropped; if it is set, a reference + * should be dropped. * - * NB at the moment, PTF_partial_set should be set if and only if - * PTF_partial_general_ref is set. - * - * NB that PTF_partial_set and PTF_partial_general_ref are - * defined in mm.c, the only place where they are used. + * NB that PTF_partial_set is defined in mm.c, the only place + * where it is used. * * The 3rd field, @linear_pt_count, indicates * - by a positive value, how many same-level page table entries a page @@ -181,8 +178,8 @@ struct page_info */ struct { u16 nr_validated_ptes:PAGETABLE_ORDER + 1; - u16 :16 - PAGETABLE_ORDER - 1 - 2; - u16 partial_flags:2; + u16 :16 - PAGETABLE_ORDER - 1 - 1; + u16 partial_flags:1; s16 linear_pt_count; };
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