This patch initializes the VT-d Posted-Interrupts Descriptor.
Signed-off-by: Feng Wu <feng...@intel.com>
---
arch/x86/kvm/vmx.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0b1383e..66ca275 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -45,6 +45,7 @@
#include <asm/perf_event.h>
#include <asm/debugreg.h>
#include <asm/kexec.h>
+#include <asm/irq_remapping.h>
#include "trace.h"
@@ -4433,6 +4434,30 @@ static void ept_set_mmio_spte_mask(void)
kvm_mmu_set_mmio_spte_mask((0x3ull << 62) | 0x6ull);
}
+static void pi_desc_init(struct vcpu_vmx *vmx)
+{
+ unsigned int dest;
+
+ if (!irq_remapping_cap(IRQ_POSTING_CAP))
+ return;
+
+ /*
+ * Initialize Posted-Interrupt Descriptor
+ */
+
+ pi_clear_sn(&vmx->pi_desc);
+ vmx->pi_desc.nv = POSTED_INTR_VECTOR;
+
+ /* Physical mode for Notificaiton Event */
+ vmx->pi_desc.ndm = 0;
+ dest = cpu_physical_id(vmx->vcpu.cpu);
+
+ if (x2apic_enabled())
+ vmx->pi_desc.ndst = dest;
+ else
+ vmx->pi_desc.ndst = (dest << 8) & 0xFF00;
+}
+
/*
* Sets up the vmcs for emulated real mode.
*/
@@ -4476,6 +4501,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
vmcs_write64(POSTED_INTR_NV, POSTED_INTR_VECTOR);
vmcs_write64(POSTED_INTR_DESC_ADDR, __pa((&vmx->pi_desc)));
+
+ pi_desc_init(vmx);
}
if (ple_gap) {
--
1.9.1
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