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--- a/docs/vmcs.md
+++ b/docs/vmcs.md
@@ -51,3 +51,34 @@ on the logical processor
- The `vmlaunch` instruction requires a VMCS whose _launch_ state is
**"clear"**
- Successful execution of the instruction changes the state to **"launched"**
+
+## Organization of VMCS data
+
+- Guest-state area
+- Host-state area
+- VM-execution control fields
+- VM-exit control fields
+- VM-entry control fields
+- VM-exit information fields
+
+### Guest-state area
+
+#### Guest Register State
+
+- Control registers (e.g. CR0, CR3, CR4)
+- Debug register -- DR7
+- RSP, RIP and RFLAGS
+- For the following registers -- CS, SS, DS, ES, FS, GS, LDTR and TR
+ - Selector (16 bits)
+ - Base address (64 bits)
+ - Segment limit (32 bits)
+ - Access rights (32 bits)
+ - _"The low 16 bits correspond to bits 23:8 of the upper 32 bits of a 64-bit segment descriptor. While bits
+ 19:16 of code-segment and data-segment descriptors correspond to the upper 4 bits of the segment
+ limit, the corresponding bits (bits 11:8) are reserved in this VMCS field._"
+ - _"Bit 16 indicates an unusable segment. Attempts to use such a segment fault except in 64-bit mode.
+ In general, a segment register is unusable if it has been loaded with a null selector."_
+ - _"Bits 31:17 are reserved"_
+
+
+