[Xen-changelog] [xen master] x86/PV: drop page table ownership check from emul-priv-op.c:read_cr()

[patchbot@xxxxxxx]

commit 7c5696ad0bab744bb2c6ad688816447da01a30d8
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 17 15:33:05 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 17 15:33:05 2019 +0200

    x86/PV: drop page table ownership check from emul-priv-op.c:read_cr()
    
    We have such a check here but no-where else. It shouldn't have been
    added by af909e7e16 ("M2P translation cannot be handled through flat
    table with") in the first place.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/pv/emul-priv-op.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/xen/arch/x86/pv/emul-priv-op.c b/xen/arch/x86/pv/emul-priv-op.c
index dde85a5166..ba63315306 100644
--- a/xen/arch/x86/pv/emul-priv-op.c
+++ b/xen/arch/x86/pv/emul-priv-op.c
@@ -723,8 +723,7 @@ static int read_cr(unsigned int reg, unsigned long *val,
             unmap_domain_page(pl4e);
             *val = compat_pfn_to_cr3(mfn_to_gmfn(currd, mfn_x(mfn)));
         }
-        /* PTs should not be shared */
-        BUG_ON(page_get_owner(mfn_to_page(mfn)) == dom_cow);
+
         return X86EMUL_OKAY;
     }
     }
--
generated by git-patchbot for /home/xen/git/xen.git#master

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