From 49cc01c8a5d0f8fec84bffcb293da2dfece10b29 Mon Sep 17 00:00:00 2001 From: _xeroxz Date: Sat, 6 Feb 2021 11:33:16 +0000 Subject: [PATCH] Update VMCS-GUEST.md --- VMCS-GUEST.md | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/VMCS-GUEST.md b/VMCS-GUEST.md index 1efcab0..28bd4f8 100644 --- a/VMCS-GUEST.md +++ b/VMCS-GUEST.md @@ -71,7 +71,16 @@ This section specifies the checks on the fields for CS, SS, DS, ES, FS, GS, TR, - TR, FS, GS. The address must be canonical. - CS. Bits 63:32 of the address must be zero. - + - SS, DS, ES. If the register is usable, bits 63:32 of the address must be zero. + +* Access-rights fields for CS, SS, DS, ES, FS, GS. + + - CS Bits 3:0 (Type): must be 9, 11, 13, or 15 (accessed code segment). + - SS. If SS is usable, the Type must be 3 or 7 (read/write, accessed data segment). + - DS, ES, FS, GS. The following checks apply if the register is usable + - Bit 0 of the Type must be 1 (accessed). + - If bit 3 of the Type is 1 (code segment), then bit 1 of the Type must be 1 (readable). + - Bit 4 (S). If the register is CS or if the register is usable, S must be 1 ``` es selector: 0x000000000000002B es base address: 0x0000000000000000