[PATCH] x86/hap: be more selective with assisted TLB flush

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

When doing an assisted flush on HAP the purpose of the
on_selected_cpus is just to trigger a vmexit on remote CPUs that are
in guest context, and hence just using is_vcpu_dirty_cpu is too lax,
also check that the vCPU is running.

While there also pass NULL as the data parameter of on_selected_cpus,
the dummy handler doesn't consume the data in any way.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/mm/hap/hap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index 580d1c2164..0275cdf5c8 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -719,7 +719,7 @@ static bool flush_tlb(bool (*flush_vcpu)(void *ctxt, struct 
vcpu *v),
         hvm_asid_flush_vcpu(v);
 
         cpu = read_atomic(&v->dirty_cpu);
-        if ( cpu != this_cpu && is_vcpu_dirty_cpu(cpu) )
+        if ( cpu != this_cpu && is_vcpu_dirty_cpu(cpu) && v->is_running )
             __cpumask_set_cpu(cpu, mask);
     }
 
@@ -729,7 +729,7 @@ static bool flush_tlb(bool (*flush_vcpu)(void *ctxt, struct 
vcpu *v),
      * not currently running will already be flushed when scheduled because of
      * the ASID tickle done in the loop above.
      */
-    on_selected_cpus(mask, dummy_flush, mask, 0);
+    on_selected_cpus(mask, dummy_flush, NULL, 0);
 
     return true;
 }
-- 
2.26.0