[Xen-devel] [PATCH v2 3/6] Nested VMX: Add interface to update vPPR

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

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

Add vlapic_set_ppr() to allow update vPPR which in virtual apic page.
vPPR updating is required when trying to emulate the APIC-v behavior of
delivery virtual interrupt to guest.

Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
---
 xen/arch/x86/hvm/vlapic.c        |    8 ++++++++
 xen/include/asm-x86/hvm/vlapic.h |    1 +
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index f1530fd..99c5700 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -168,6 +168,14 @@ static uint32_t vlapic_get_ppr(struct vlapic *vlapic)
     return ppr;
 }
 
+uint32_t vlapic_set_ppr(struct vlapic *vlapic)
+{
+   uint32_t ppr = vlapic_get_ppr(vlapic);
+
+   vlapic_set_reg(vlapic, APIC_PROCPRI, ppr);
+   return ppr;
+}
+
 static int vlapic_match_logical_addr(struct vlapic *vlapic, uint8_t mda)
 {
     int result = 0;
diff --git a/xen/include/asm-x86/hvm/vlapic.h b/xen/include/asm-x86/hvm/vlapic.h
index 021a5f2..29ba7d9 100644
--- a/xen/include/asm-x86/hvm/vlapic.h
+++ b/xen/include/asm-x86/hvm/vlapic.h
@@ -108,6 +108,7 @@ void vlapic_tdt_msr_set(struct vlapic *vlapic, uint64_t 
value);
 uint64_t vlapic_tdt_msr_get(struct vlapic *vlapic);
 
 int vlapic_accept_pic_intr(struct vcpu *v);
+uint32_t vlapic_set_ppr(struct vlapic *vlapic);
 
 void vlapic_adjust_i8259_target(struct domain *d);
 
-- 
1.7.1


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