[RFC PATCH v3 01/27] x86/apic: Propagate APIC_SPIV writes to hv for Secure AVIC

[Naveen N Rao (AMD)]

From: Neeraj Upadhyay <Neeraj.Upadhyay@xxxxxxx>

Hypervisor needs to be aware of the VAPIC's APIC_SPIV state for
LVT masking/unmasking. So, propagate the guest's APIC_SPIV
writes to the hypervisor.

Fixes: c822f58a4fab ("x86/apic: Populate .read()/.write() callbacks of Secure AVIC driver")
Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@xxxxxxx>
---
 arch/x86/kernel/apic/x2apic_savic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/x2apic_savic.c b/arch/x86/kernel/apic/x2apic_savic.c
index dbc5678bc3b6..cb3b55225ab6 100644
--- a/arch/x86/kernel/apic/x2apic_savic.c
+++ b/arch/x86/kernel/apic/x2apic_savic.c
@@ -214,7 +214,6 @@ static void savic_write(u32 reg, u32 data)
 		break;
 	case APIC_TASKPRI:
 	case APIC_EOI:
-	case APIC_SPIV:
 	case SAVIC_NMI_REQ:
 	case APIC_ESR:
 	case APIC_ECTRL:
@@ -223,6 +222,10 @@ static void savic_write(u32 reg, u32 data)
 	case APIC_EILVTn(0) ... APIC_EILVTn(3):
 		apic_set_reg(ap, reg, data);
 		break;
+	case APIC_SPIV:
+		apic_set_reg(ap, reg, data);
+		savic_ghcb_msr_write(reg, data);
+		break;
 	case APIC_ICR:
 		savic_icr_write(data, 0);
 		break;
-- 
2.54.0