30 lines
1.3 KiB
Diff
30 lines
1.3 KiB
Diff
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References: bnc#726332
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# HG changeset patch
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# User Gianluca Guida <gianluca.guida@citrix.com>
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# Date 1321456773 0
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# Node ID 3ecc8fef428138e4304ef11b47498981e63626b3
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# Parent a5f1d3b1612bb48e1cb09dc66b0909e3613dc855
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[shadow] Disable higher level pagetables early unshadow only when the "process dying" hypercall is used.
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This patch fixes a performance problem in fully virtualized guests.
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Signed-off-by: Gianluca Guida <gianluca.guida@citrix.com>
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Tested-by: Jan Beulich <jbeulich@suse.com>
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Committed-by: Keir Fraser <keir@xen.org>
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--- a/xen/arch/x86/mm/shadow/multi.c
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+++ b/xen/arch/x86/mm/shadow/multi.c
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@@ -2743,8 +2743,9 @@ static inline void check_for_early_unsha
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|| ( !v->domain->arch.paging.shadow.pagetable_dying_op
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&& v->arch.paging.shadow.last_emulated_mfn_for_unshadow == mfn_x(gmfn) ) )
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&& sh_mfn_is_a_page_table(gmfn)
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- && !(mfn_to_page(gmfn)->shadow_flags
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- & (SHF_L2_32|SHF_L2_PAE|SHF_L2H_PAE|SHF_L4_64)) )
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+ && (!v->domain->arch.paging.shadow.pagetable_dying_op ||
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+ !(mfn_to_page(gmfn)->shadow_flags
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+ & (SHF_L2_32|SHF_L2_PAE|SHF_L2H_PAE|SHF_L4_64))) )
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{
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perfc_incr(shadow_early_unshadow);
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sh_remove_shadows(v, gmfn, 1, 0 /* Fast, can fail to unshadow */ );
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