[Xen-devel] [PATCH v1 06/14] x86/np2m: add stale_np2m flag

[Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>]

The new element will indicate if update of a shadow p2m_base is needed
prior to vmentry. Update is required if a nested vcpu gets a new np2m
or if its np2m was flushed by an IPI.

Add nvcpu_flush() helper function.

Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
 xen/arch/x86/hvm/nestedhvm.c   |  2 ++
 xen/arch/x86/mm/p2m.c          | 10 ++++++++--
 xen/include/asm-x86/hvm/vcpu.h |  1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/nestedhvm.c b/xen/arch/x86/hvm/nestedhvm.c
index 32b8acca6a..5b012568c4 100644
--- a/xen/arch/x86/hvm/nestedhvm.c
+++ b/xen/arch/x86/hvm/nestedhvm.c
@@ -57,6 +57,7 @@ nestedhvm_vcpu_reset(struct vcpu *v)
     nv->nv_flushp2m = 0;
     nv->nv_p2m = NULL;
     nv->np2m_generation = 0;
+    nv->stale_np2m = false;
 
     hvm_asid_flush_vcpu_asid(&nv->nv_n2asid);
 
@@ -108,6 +109,7 @@ nestedhvm_flushtlb_ipi(void *info)
      */
     hvm_asid_flush_core();
     vcpu_nestedhvm(v).nv_p2m = NULL;
+    vcpu_nestedhvm(v).stale_np2m = true;
 }
 
 void
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 2999b858e4..053df0c9aa 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1812,6 +1812,12 @@ static void assign_np2m(struct vcpu *v, struct 
p2m_domain *p2m)
     cpumask_set_cpu(v->processor, p2m->dirty_cpumask);
 }
 
+static void nvcpu_flush(struct vcpu *v)
+{
+    hvm_asid_flush_vcpu(v);
+    vcpu_nestedhvm(v).stale_np2m = true;
+}
+
 struct p2m_domain *
 p2m_get_nestedp2m(struct vcpu *v)
 {
@@ -1835,7 +1841,7 @@ p2m_get_nestedp2m(struct vcpu *v)
         if ( p2m->np2m_base == np2m_base || p2m->np2m_base == P2M_BASE_EADDR )
         {
             if ( p2m->np2m_base == P2M_BASE_EADDR )
-                hvm_asid_flush_vcpu(v);
+                nvcpu_flush(v);
             p2m->np2m_base = np2m_base;
             assign_np2m(v, p2m);
             p2m_unlock(p2m);
@@ -1852,7 +1858,7 @@ p2m_get_nestedp2m(struct vcpu *v)
     p2m_flush_table(p2m);
     p2m_lock(p2m);
     p2m->np2m_base = np2m_base;
-    hvm_asid_flush_vcpu(v);
+    nvcpu_flush(v);
     assign_np2m(v, p2m);
     p2m_unlock(p2m);
     nestedp2m_unlock(d);
diff --git a/xen/include/asm-x86/hvm/vcpu.h b/xen/include/asm-x86/hvm/vcpu.h
index 91651581db..16af97942f 100644
--- a/xen/include/asm-x86/hvm/vcpu.h
+++ b/xen/include/asm-x86/hvm/vcpu.h
@@ -116,6 +116,7 @@ struct nestedvcpu {
     bool_t nv_flushp2m; /* True, when p2m table must be flushed */
     struct p2m_domain *nv_p2m; /* used p2m table for this vcpu */
     uint64_t np2m_generation;
+    bool stale_np2m; /* True when p2m_base in VMCX02 is no longer valid */
 
     struct hvm_vcpu_asid nv_n2asid;
 
-- 
2.11.0


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