[Xen-changelog] [xen master] vmx: initialize VT-d Posted-Interrupts Descriptor

[patchbot@xxxxxxx]

commit 29446895edc28da63ba0f7e97872b09745eba823
Author:     Feng Wu <feng.wu@xxxxxxxxx>
AuthorDate: Tue Nov 24 12:12:39 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Nov 24 12:12:39 2015 +0100

    vmx: initialize VT-d Posted-Interrupts Descriptor
    
    This patch initializes the VT-d Posted-interrupt Descriptor.
    
    Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c       |   22 ++++++++++++++++++++++
 xen/include/asm-x86/hvm/vmx/vmx.h |    2 ++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index d6dab8e..202c0a4 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -39,6 +39,7 @@
 #include <asm/flushtlb.h>
 #include <asm/shadow.h>
 #include <asm/tboot.h>
+#include <asm/apic.h>
 
 static bool_t __read_mostly opt_vpid_enabled = 1;
 boolean_param("vpid", opt_vpid_enabled);
@@ -964,6 +965,24 @@ void virtual_vmcs_vmwrite(const struct vcpu *v, u32 
vmcs_encoding, u64 val)
     virtual_vmcs_exit(v);
 }
 
+/*
+ * This function is only called in a vCPU's initialization phase,
+ * so we can update the posted-interrupt descriptor in non-atomic way.
+ */
+static void pi_desc_init(struct vcpu *v)
+{
+    uint32_t dest;
+
+    v->arch.hvm_vmx.pi_desc.nv = posted_intr_vector;
+
+    dest = cpu_physical_id(v->processor);
+
+    if ( x2apic_enabled )
+        v->arch.hvm_vmx.pi_desc.ndst = dest;
+    else
+        v->arch.hvm_vmx.pi_desc.ndst = MASK_INSR(dest, PI_xAPIC_NDST_MASK);
+}
+
 static int construct_vmcs(struct vcpu *v)
 {
     struct domain *d = v->domain;
@@ -1102,6 +1121,9 @@ static int construct_vmcs(struct vcpu *v)
 
     if ( cpu_has_vmx_posted_intr_processing )
     {
+        if ( iommu_intpost )
+            pi_desc_init(v);
+
         __vmwrite(PI_DESC_ADDR, virt_to_maddr(&v->arch.hvm_vmx.pi_desc));
         __vmwrite(POSTED_INTR_NOTIFICATION_VECTOR, posted_intr_vector);
     }
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h 
b/xen/include/asm-x86/hvm/vmx/vmx.h
index dd3a135..7831b9a 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -88,6 +88,8 @@ typedef enum {
 #define EPT_EMT_WB              6
 #define EPT_EMT_RSV2            7
 
+#define PI_xAPIC_NDST_MASK      0xFF00
+
 void vmx_asm_vmexit_handler(struct cpu_user_regs);
 void vmx_asm_do_vmentry(void);
 void vmx_intr_assist(void);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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