[Xen-devel] [PATCH 3/9] x86/np2m: remove np2m_base from p2m_get_nestedp2m()

[George Dunlap <george.dunlap@xxxxxxxxxx>]

From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

Remove np2m_base parameter as it should always match the value of
np2m_base in VMCX12.

Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Jun Nakajima <jun.nakajima@xxxxxxxxx>
CC: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/svm/nestedsvm.c | 6 +++++-
 xen/arch/x86/hvm/vmx/vvmx.c      | 3 +--
 xen/arch/x86/mm/hap/nested_hap.c | 2 +-
 xen/arch/x86/mm/p2m.c            | 8 ++++----
 xen/include/asm-x86/p2m.h        | 5 ++---
 5 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c
index 66a1777298..1de896e456 100644
--- a/xen/arch/x86/hvm/svm/nestedsvm.c
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c
@@ -412,7 +412,11 @@ static void nestedsvm_vmcb_set_nestedp2m(struct vcpu *v,
     ASSERT(v != NULL);
     ASSERT(vvmcb != NULL);
     ASSERT(n2vmcb != NULL);
-    p2m = p2m_get_nestedp2m(v, vvmcb->_h_cr3);
+
+    /* This will allow nsvm_vcpu_hostcr3() to return correct np2m_base */
+    vcpu_nestedsvm(v).ns_vmcb_hostcr3 = vvmcb->_h_cr3;
+
+    p2m = p2m_get_nestedp2m(v);
     n2vmcb->_h_cr3 = pagetable_get_paddr(p2m_get_pagetable(p2m));
 }
 
diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index d333aa6d78..2f468e6ced 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1109,8 +1109,7 @@ static void load_shadow_guest_state(struct vcpu *v)
 
 uint64_t get_shadow_eptp(struct vcpu *v)
 {
-    uint64_t np2m_base = nvmx_vcpu_eptp_base(v);
-    struct p2m_domain *p2m = p2m_get_nestedp2m(v, np2m_base);
+    struct p2m_domain *p2m = p2m_get_nestedp2m(v);
     struct ept_data *ept = &p2m->ept;
 
     ept->mfn = pagetable_get_pfn(p2m_get_pagetable(p2m));
diff --git a/xen/arch/x86/mm/hap/nested_hap.c b/xen/arch/x86/mm/hap/nested_hap.c
index 162afed46b..ed137fa784 100644
--- a/xen/arch/x86/mm/hap/nested_hap.c
+++ b/xen/arch/x86/mm/hap/nested_hap.c
@@ -212,7 +212,7 @@ nestedhvm_hap_nested_page_fault(struct vcpu *v, paddr_t 
*L2_gpa,
     uint8_t p2ma_21 = p2m_access_rwx;
 
     p2m = p2m_get_hostp2m(d); /* L0 p2m */
-    nested_p2m = p2m_get_nestedp2m(v, nhvm_vcpu_p2m_base(v));
+    nested_p2m = p2m_get_nestedp2m(v);
 
     /* walk the L1 P2M table */
     rv = nestedhap_walk_L1_p2m(v, *L2_gpa, &L1_gpa, &page_order_21, &p2ma_21,
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index b7588b2ec1..d3e602de22 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1813,11 +1813,12 @@ static void assign_np2m(struct vcpu *v, struct 
p2m_domain *p2m)
 }
 
 struct p2m_domain *
-p2m_get_nestedp2m(struct vcpu *v, uint64_t np2m_base)
+p2m_get_nestedp2m(struct vcpu *v)
 {
     struct nestedvcpu *nv = &vcpu_nestedhvm(v);
     struct domain *d = v->domain;
     struct p2m_domain *p2m;
+    uint64_t np2m_base = nhvm_vcpu_p2m_base(v);
 
     /* Mask out low bits; this avoids collisions with P2M_BASE_EADDR */
     np2m_base &= ~(0xfffull);
@@ -1865,7 +1866,7 @@ p2m_get_p2m(struct vcpu *v)
     if (!nestedhvm_is_n2(v))
         return p2m_get_hostp2m(v->domain);
 
-    return p2m_get_nestedp2m(v, nhvm_vcpu_p2m_base(v));
+    return p2m_get_nestedp2m(v);
 }
 
 unsigned long paging_gva_to_gfn(struct vcpu *v,
@@ -1880,13 +1881,12 @@ unsigned long paging_gva_to_gfn(struct vcpu *v,
         unsigned long l2_gfn, l1_gfn;
         struct p2m_domain *p2m;
         const struct paging_mode *mode;
-        uint64_t np2m_base = nhvm_vcpu_p2m_base(v);
         uint8_t l1_p2ma;
         unsigned int l1_page_order;
         int rv;
 
         /* translate l2 guest va into l2 guest gfn */
-        p2m = p2m_get_nestedp2m(v, np2m_base);
+        p2m = p2m_get_nestedp2m(v);
         mode = paging_get_nestedmode(v);
         l2_gfn = mode->gva_to_gfn(v, p2m, va, pfec);
 
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 5501ccc455..85874ab401 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -360,10 +360,9 @@ struct p2m_domain {
 #define p2m_get_hostp2m(d)      ((d)->arch.p2m)
 
 /*
- * Assigns an np2m with the specified np2m_base to the specified vCPU
- * and returns that np2m.
+ * Updates vCPU's n2pm to match its np2m_base in VMCX12 and returns that np2m.
  */
-struct p2m_domain *p2m_get_nestedp2m(struct vcpu *v, uint64_t np2m_base);
+struct p2m_domain *p2m_get_nestedp2m(struct vcpu *v);
 
 /* If vcpu is in host mode then behaviour matches p2m_get_hostp2m().
  * If vcpu is in guest mode then behaviour matches p2m_get_nestedp2m().
-- 
2.14.1


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