[xen staging] x86/altp2m: don't consider "active" when enabling failed

[patchbot@xxxxxxx]

commit 5e97b97bc254b0ee23f701a4d5a317853136d288
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 19 10:05:10 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 19 10:05:10 2021 +0200

    x86/altp2m: don't consider "active" when enabling failed
    
    We should not rely on guests to not use altp2m after reporting failure
    of HVMOP_altp2m_set_domain_state to them. Set "active" back to false in
    this case.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 3a6fd865d9..eee365711d 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4622,6 +4622,8 @@ static int do_altp2m_op(
             if ( ostate )
                 p2m_flush_altp2m(d);
         }
+        else if ( rc )
+            d->arch.altp2m_active = false;
 
         domain_unpause_except_self(d);
         break;
--
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