From 4589df0fc1eb4bcb09ee65d33c34136a1372bdb2 Mon Sep 17 00:00:00 2001 From: Alexander Potapenko Date: Fri, 23 Jan 2026 18:08:33 +0100 Subject: executor: introduce global state page for SYZOS Reserve a dedicated 4KB page at X86_SYZOS_ADDR_GLOBALS (0x17F000) to store global state shared across the SYZOS L1 guest environment. This region is required to store the state of the guest-side memory allocator (specifically the allocation offset and total size of the unused heap), enabling thread-safe dynamic memory allocation for nested L2 page tables. --- executor/kvm.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'executor/kvm.h') diff --git a/executor/kvm.h b/executor/kvm.h index f377887a6..b0630c161 100644 --- a/executor/kvm.h +++ b/executor/kvm.h @@ -76,6 +76,9 @@ // Base offset for the area containing the 4 L2 VM slots. #define X86_SYZOS_L1_VCPU_OFFSET_L2_VMS_AREA 0x1000 +// Global state page (Allocator offsets, etc). +#define X86_SYZOS_ADDR_GLOBALS 0x17F000 + // Separated Page Table Pool in high memory. // Located above L2 VCPU regions. #define X86_SYZOS_ADDR_PT_POOL 0x180000 -- cgit mrf-deployment