From 441b58437f1b095b5a834fd317897f585b164525 Mon Sep 17 00:00:00 2001
From: Jinank Jain <jinankjain@microsoft.com>
Date: Tue, 6 Feb 2024 16:11:14 +0530
Subject: [PATCH] vmm: Don't configure vcpu in case of SEV-SNP

Traditional way to configure vcpu don't work for sev-snp guests. All the
vCPU configuration for SEV-SNP guest is provided via VMSA.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
Signed-off-by: Muminul Islam <muislam@microsoft.com>
---
 vmm/src/cpu.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/vmm/src/cpu.rs b/vmm/src/cpu.rs
index f36db223c..aa3589f64 100644
--- a/vmm/src/cpu.rs
+++ b/vmm/src/cpu.rs
@@ -829,7 +829,12 @@ impl CpuManager {
                     kernel_entry_point.entry_addr.0 / crate::igvm::HV_PAGE_SIZE,
                 )?;
             }
+
+            // Traditional way to configure vcpu doesn't work for SEV-SNP guests.
+            // All the vCPU configuration for SEV-SNP guest is provided via VMSA.
+            return Ok(());
         }
+
         #[cfg(target_arch = "x86_64")]
         assert!(!self.cpuid.is_empty());