[xen master] x86/EPT: squash meaningless TLB flush

[patchbot@xxxxxxx]

commit 4a59e6bb3a96f5ebca95d162b2a81b3e68b076a2
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jan 4 10:13:06 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jan 4 10:13:06 2022 +0100

    x86/EPT: squash meaningless TLB flush
    
    ept_free_entry() gets called after a flush was already issued, if one is
    necessary in the first place. That behavior is similar to NPT, which
    also doesn't have any further flush in p2m_free_entry(). (Furthermore,
    the function being recursive, in case of recursiveness way too many
    flushes would have been issued.)
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/mm/p2m-ept.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
index a4f5fc4b0d..b7ee441d45 100644
--- a/xen/arch/x86/mm/p2m-ept.c
+++ b/xen/arch/x86/mm/p2m-ept.c
@@ -246,8 +246,7 @@ static void ept_free_entry(struct p2m_domain *p2m, 
ept_entry_t *ept_entry, int l
             ept_free_entry(p2m, epte + i, level - 1);
         unmap_domain_page(epte);
     }
-    
-    p2m_tlb_flush_sync(p2m);
+
     p2m_free_ptp(p2m, mfn_to_page(_mfn(ept_entry->mfn)));
 }
 
--
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