From 4bd2c8c8b9dc1ce823a93d48e431deeb38fa1c50 Mon Sep 17 00:00:00 2001 From: Tamas K Lengyel Date: Tue, 14 Nov 2023 14:00:20 +0100 Subject: [PATCH] x86/mem_sharing: add missing m2p entry when mapping shared_info page When mapping in the shared_info page to a fork the m2p entry wasn't set resulting in the shared_info being reset even when the fork reset was called with only reset_state and not reset_memory. This results in an extra unnecessary TLB flush. Fixes: 1a0000ac775 ("mem_sharing: map shared_info page to same gfn during fork") Signed-off-by: Tamas K Lengyel Acked-by: Andrew Cooper master commit: 23eb39acf011ef9bbe02ed4619c55f208fbcd39b master date: 2023-10-31 16:10:14 +0000 --- xen/arch/x86/mm/mem_sharing.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c index 5b3449db7a..90ffb10401 100644 --- a/xen/arch/x86/mm/mem_sharing.c +++ b/xen/arch/x86/mm/mem_sharing.c @@ -1860,6 +1860,8 @@ static int copy_special_pages(struct domain *cd, struct domain *d) p2m_ram_rw, p2m->default_access, -1); if ( rc ) return rc; + + set_gpfn_from_mfn(mfn_x(new_mfn), gfn_x(old_gfn)); } } -- 2.39.5