diff options
| author | Alexander Potapenko <glider@google.com> | 2026-01-23 18:08:33 +0100 |
|---|---|---|
| committer | Alexander Potapenko <glider@google.com> | 2026-01-26 09:30:24 +0000 |
| commit | 4589df0fc1eb4bcb09ee65d33c34136a1372bdb2 (patch) | |
| tree | e826ff6ced09de6110222dd7d81a0084496b5150 /executor/common_kvm_amd64.h | |
| parent | ef506c965c182fd79dbaf25d23ca017dd7fc4177 (diff) | |
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.
Diffstat (limited to 'executor/common_kvm_amd64.h')
| -rw-r--r-- | executor/common_kvm_amd64.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/executor/common_kvm_amd64.h b/executor/common_kvm_amd64.h index 06efc7f20..12bc8958d 100644 --- a/executor/common_kvm_amd64.h +++ b/executor/common_kvm_amd64.h @@ -237,6 +237,8 @@ static const struct mem_region syzos_mem_regions[] = { {X86_SYZOS_ADDR_BOOT_ARGS, 1, 0}, // Dynamic Page Table Pool. {X86_SYZOS_ADDR_PT_POOL, X86_SYZOS_PT_POOL_SIZE, 0}, + // Global State Page. + {X86_SYZOS_ADDR_GLOBALS, 1, 0}, // SMRAM memory. {X86_SYZOS_ADDR_SMRAM, 10, 0}, // Unmapped region to trigger a page faults for uexits etc. |