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Subject[PATCH 02/13] KVM: Initialize VT-d Posted-Interrtups Descriptor
Date
This patch initialize the VT-d Posted-interrupt Descritpor.

Signed-off-by: Feng Wu <feng.wu@intel.com>
---
arch/x86/include/asm/irq_remapping.h | 1 +
arch/x86/kernel/apic/apic.c | 1 +
arch/x86/kvm/vmx.c | 56 ++++++++++++++++++++++++++++++++-
3 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index b7747c4..a3cc437 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -57,6 +57,7 @@ extern bool setup_remapped_irq(int irq,
struct irq_chip *chip);

void irq_remap_modify_chip_defaults(struct irq_chip *chip);
+extern int irq_post_enabled;

#else /* CONFIG_IRQ_REMAP */

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index ba6cc04..987408d 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -162,6 +162,7 @@ __setup("apicpmtimer", setup_apicpmtimer);
#endif

int x2apic_mode;
+EXPORT_SYMBOL_GPL(x2apic_mode);
#ifdef CONFIG_X86_X2APIC
/* x2apic enabled before OS handover */
int x2apic_preenabled;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 3e556c6..a4670d3 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"

@@ -408,13 +409,32 @@ struct nested_vmx {
};

#define POSTED_INTR_ON 0
+#define POSTED_INTR_SN 1
+
/* Posted-Interrupt Descriptor */
struct pi_desc {
u32 pir[8]; /* Posted interrupt requested */
- u32 control; /* bit 0 of control is outstanding notification bit */
- u32 rsvd[7];
+ union {
+ struct {
+ u64 on : 1,
+ sn : 1,
+ rsvd_1 : 13,
+ ndm : 1,
+ nv : 8,
+ rsvd_2 : 8,
+ ndst : 32;
+ };
+ u64 control;
+ };
+ u32 rsvd[6];
} __aligned(64);

+static void pi_clear_sn(struct pi_desc *pi_desc)
+{
+ return clear_bit(POSTED_INTR_SN,
+ (unsigned long *)&pi_desc->control);
+}
+
static bool pi_test_and_set_on(struct pi_desc *pi_desc)
{
return test_and_set_bit(POSTED_INTR_ON,
@@ -4396,6 +4416,33 @@ static void ept_set_mmio_spte_mask(void)
kvm_mmu_set_mmio_spte_mask((0x3ull << 62) | 0x6ull);
}

+static bool pi_desc_init(struct vcpu_vmx *vmx)
+{
+ unsigned int dest;
+
+ if (irq_post_enabled == 0)
+ return true;
+
+ /*
+ * 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_mode)
+ vmx->pi_desc.ndst = dest;
+ else
+ vmx->pi_desc.ndst = (dest << 8) & 0xFF00;
+
+ return true;
+}
+
+
/*
* Sets up the vmcs for emulated real mode.
*/
@@ -4439,6 +4486,11 @@ 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)));
+
+ if (!pi_desc_init(vmx)) {
+ printk(KERN_ERR "Initialize PI descriptor error!\n");
+ return 1;
+ }
}

if (ple_gap) {
--
1.7.1


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