executor: x86: Prepare memory layout and hardware constants for NV

This patch lays the groundwork for nested virtualization by rearranging
the KVM guest's memory map.

Key changes include:
- Introducing a dedicated per-VCPU memory region for L2 VMs.
- Updating `executor/kvm.h` with:
    - Adjusted stack addresses for the L1 guest.
    - Detailed memory layout macros for L2 VM structures

1 files changed, 2 insertions, 0 deletions

diff --git a/executor/common_kvm_amd64.h b/executor/common_kvm_amd64.h
index e4c961962..818dc8125 100644
--- a/executor/common_kvm_amd64.h
+++ b/executor/common_kvm_amd64.h
@@ -238,6 +238,8 @@ static const struct mem_region syzos_mem_regions[] = {
     {X86_SYZOS_ADDR_SCRATCH_CODE, 1, 0},
     // CPU stack.
     {X86_SYZOS_ADDR_STACK_BOTTOM, 1, 0},
+    // Per-VCPU regions for L2 VMs.
+    {X86_SYZOS_PER_VCPU_REGIONS_BASE, (KVM_MAX_VCPU * X86_SYZOS_L1_VCPU_REGION_SIZE) / KVM_PAGE_SIZE, 0},
     // IOAPIC memory.
     {X86_SYZOS_ADDR_IOAPIC, 1, 0},
 };