[Xen-devel] [V0 PATCH 1/6] AMD-PVH: construct vmcb changes

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

PVH guest starts in Long 64bit paging mode. This patch modifies
construct_vmcb for that.

Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
---
 xen/arch/x86/hvm/svm/vmcb.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/vmcb.c b/xen/arch/x86/hvm/svm/vmcb.c
index 21292bb..5df5f36 100644
--- a/xen/arch/x86/hvm/svm/vmcb.c
+++ b/xen/arch/x86/hvm/svm/vmcb.c
@@ -138,6 +138,8 @@ static int construct_vmcb(struct vcpu *v)
 
     /* Guest EFER. */
     v->arch.hvm_vcpu.guest_efer = 0;
+    if ( is_pvh_vcpu(v) )
+        v->arch.hvm_vcpu.guest_efer |= EFER_LMA;   /* PVH 32bitfixme */
     hvm_update_guest_efer(v);
 
     /* Guest segment limits. */
@@ -162,7 +164,12 @@ static int construct_vmcb(struct vcpu *v)
     vmcb->ds.attr.bytes = 0xc93;
     vmcb->fs.attr.bytes = 0xc93;
     vmcb->gs.attr.bytes = 0xc93;
-    vmcb->cs.attr.bytes = 0xc9b; /* exec/read, accessed */
+
+    if ( is_pvh_vcpu(v) )
+        /* CS.L == 1, exec, read/write, accessed. PVH 32bitfixme. */
+        vmcb->cs.attr.bytes = 0xa9b;
+    else
+        vmcb->cs.attr.bytes = 0xc9b; /* exec/read, accessed */
 
     /* Guest IDT. */
     vmcb->idtr.base = 0;
@@ -184,12 +191,17 @@ static int construct_vmcb(struct vcpu *v)
     vmcb->tr.limit = 0xff;
 
     v->arch.hvm_vcpu.guest_cr[0] = X86_CR0_PE | X86_CR0_ET;
+    /* PVH domains start in paging mode */
+    if ( is_pvh_vcpu(v) )
+        v->arch.hvm_vcpu.guest_cr[0] |= X86_CR0_PG;
     hvm_update_guest_cr(v, 0);
 
-    v->arch.hvm_vcpu.guest_cr[4] = 0;
+    v->arch.hvm_vcpu.guest_cr[4] = is_pvh_vcpu(v) ? X86_CR4_PAE : 0;
     hvm_update_guest_cr(v, 4);
 
-    paging_update_paging_modes(v);
+    /* For pvh, paging mode is updated by arch_set_info_guest(). */
+    if ( is_hvm_vcpu(v) )
+        paging_update_paging_modes(v);
 
     vmcb->_exception_intercepts =
         HVM_TRAP_MASK
-- 
1.8.3.1


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