[Xen-devel] [PATCH 6/7] Nested VMX: Update APIC-v(RVI/SVI) when vmexit to L1

[Yang Zhang <yang.z.zhang@xxxxxxxxx>]

From: Yang Zhang <yang.z.zhang@xxxxxxxxx>

If enabling APIC-v, all interrupts to L1 is delivered through APIC-v.
But when L2 is running, external interrupt will casue L1 vmexit with
reason external interrupt. Then L1 will pick up the interrupt through
vmcs. So we need to update APIC-v related structure accordingly;

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 5dfbc54..9ba169d 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1283,6 +1283,41 @@ static void sync_exception_state(struct vcpu *v)
     }
 }
 
+static void nvmx_update_apicv(struct vcpu *v)
+{
+    struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
+    struct nestedvcpu *nvcpu = &vcpu_nestedhvm(v);
+    unsigned long reason = __get_vvmcs(nvcpu->nv_vvmcx, VM_EXIT_REASON);
+    uint32_t intr_info = __get_vvmcs(nvcpu->nv_vvmcx, VM_EXIT_INTR_INFO);
+
+    if ( !cpu_has_vmx_virtual_intr_delivery )
+        return;
+
+    if ( reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
+            nvmx->intr.source == hvm_intsrc_lapic &&
+            (intr_info & INTR_INFO_VALID_MASK) )
+    {
+        unsigned long status;
+        uint32_t rvi, ppr;
+        uint32_t vector = intr_info & 0xff;
+        struct vlapic *vlapic = vcpu_vlapic(v);
+
+        WARN_ON(vector <= 0);
+
+        vlapic_ack_pending_irq(v, vector, 1);
+
+        ppr = vlapic_set_ppr(vlapic);
+        BUG_ON( (ppr & 0xf0) != (vector & 0xf0) );
+
+        status = (vector << 8) & 0xff00;
+        rvi = vlapic_has_pending_irq(v);
+        if ( rvi != -1 )
+            status |= rvi & 0xff;
+
+        __vmwrite(GUEST_INTR_STATUS, status);
+    }
+}
+
 static void virtual_vmexit(struct cpu_user_regs *regs)
 {
     struct vcpu *v = current;
@@ -1328,6 +1363,8 @@ static void virtual_vmexit(struct cpu_user_regs *regs)
     /* updating host cr0 to sync TS bit */
     __vmwrite(HOST_CR0, v->arch.hvm_vmx.host_cr0);
 
+    nvmx_update_apicv(v);
+
     vmreturn(regs, VMSUCCEED);
 }
 
-- 
1.7.1


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