[RFC PATCH 1/9] x86/sev: Define extended #HV doorbell page structure

[Melody Wang <huibo.wang@amd.com>]

Alternate Injection extends the #HV doorbell page with additional
information about interrupts or events related to interrupt processing
for VMPL1-3.

Define the extended #HV doorbell page according to the spec.

Signed-off-by: Melody Wang <huibo.wang@amd.com>
---
 arch/x86/include/asm/svm.h | 60 +++++++++++++++++++++++++++++++++++---
 1 file changed, 56 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 32a35ee10bce..c658eba189dc 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -259,8 +259,43 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
  * is shared between the guest and hypervisor to communicate exception and
  * interrupt events.
  */
+struct ext_irq_desc {
+	/* first 16-bit word */
+	union {
+		struct {
+			u16 si_vector:		8,
+			    nmi:		1,
+			    mce:		1,
+			    trigger_mode:	1,
+			    reserved6:		3,
+			    multi_interrupts:	1,
+			    reserved7:		1;
+		};
+
+		u16 ext_word0;
+	};
+
+	/* Second 16-bit word */
+	union {
+		struct {
+			u16 reserved8:		15,
+			    interrupt_vector:	1;
+		};
+
+		u16 ext_word1;
+	};
+
+	/*
+	 * Set the corresponding vmpl?_irq bit in the bitmap after setting
+	 * multiple bits here.
+	 */
+	u16 interrupt_bit_vector[14];
+
+	u8 reserved9[32];
+} __packed;
+
 struct hvdb_events {
-	/* First 64 bytes of HV doorbell page defined in GHCB specification */
+	/* first 16-bit word PendingEvent */
 	union {
 		struct {
 			/* Non-maskable event indicators */
@@ -274,10 +309,27 @@ struct hvdb_events {
 		u16 pending_events;
 	};
 
-	u8 no_eoi_required;
+	/* Second 16-bit word InjectionInfo */
+	union {
+		struct {
+			u16 no_eoi_required:	1,
+			    reserved3:		7,
+			    vmpl1_irq:		1,
+			    vmpl2_irq:		1,
+			    vmpl3_irq:		1,
+			    reserved4:		5;
+		};
+
+		u16 second_word;
+	};
+
+	/* IRQ info associated with the SVSM itself */
+	u8 svsm_irq_info[64 - 4];
 
-	u8 reserved3[61];
-};
+	/* VMPL[1-3] extended IRQ descriptions */
+	struct ext_irq_desc irqs[3];
+
+} __packed;
 
 struct hvdb {
 	struct hvdb_events events;
-- 
2.43.0