[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-3.0-testing] [HVM] Fix set_guest_back_ptr to ignore empty PTEs.
# HG changeset patch # User kaf24@xxxxxxxxxxxxxxxxxxxx # Node ID 29ed4e0fdeae52cb19c4425cff182046a050249e # Parent 648bb8901eda44dc04b744c0eca72685cac73065 [HVM] Fix set_guest_back_ptr to ignore empty PTEs. Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx> xen-unstable changeset: 10237:121ec8b952d33a358e6c6ab65493e0b47e56781d xen-unstable date: Thu Jun 01 10:50:33 2006 +0100 --- xen/include/asm-x86/shadow.h | 37 ++++++++++++++++++++----------------- 1 files changed, 20 insertions(+), 17 deletions(-) diff -r 648bb8901eda -r 29ed4e0fdeae xen/include/asm-x86/shadow.h --- a/xen/include/asm-x86/shadow.h Thu Jun 01 10:59:50 2006 +0100 +++ b/xen/include/asm-x86/shadow.h Thu Jun 01 11:00:13 2006 +0100 @@ -756,23 +756,26 @@ shadow_unpin(unsigned long smfn) * when working on finer-gained locks for shadow. */ static inline void set_guest_back_ptr( - struct domain *d, l1_pgentry_t spte, unsigned long smfn, unsigned int index) -{ - if ( shadow_mode_external(d) ) { - unsigned long gmfn; - - ASSERT(shadow_lock_is_acquired(d)); - ASSERT( smfn ); - gmfn = l1e_get_pfn(spte); - ASSERT( gmfn ); - if ( l1e_get_flags(spte) & _PAGE_RW ) - { - mfn_to_page(gmfn)->tlbflush_timestamp = smfn; - mfn_to_page(gmfn)->u.inuse.type_info &= ~PGT_va_mask; - mfn_to_page(gmfn)->u.inuse.type_info |= - (unsigned long) index << PGT_va_shift; - } - } + struct domain *d, l1_pgentry_t spte, + unsigned long smfn, unsigned int index) +{ + struct page_info *gpage; + + ASSERT(shadow_lock_is_acquired(d)); + + if ( !shadow_mode_external(d) || + ((l1e_get_flags(spte) & (_PAGE_PRESENT|_PAGE_RW)) != + (_PAGE_PRESENT|_PAGE_RW)) ) + return; + + gpage = l1e_get_page(spte); + + ASSERT(smfn != 0); + ASSERT(page_to_mfn(gpage) != 0); + + gpage->tlbflush_timestamp = smfn; + gpage->u.inuse.type_info &= ~PGT_va_mask; + gpage->u.inuse.type_info |= (unsigned long)index << PGT_va_shift; } /************************************************************************/ _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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