[edk2-devel] [PATCH v4 07/11] UefiCpuPkg/MpInitLib: Set the SW exit fields when performing VMGEXIT

[Lendacky, Thomas]

From: Tom Lendacky <thomas.lendacky at amd.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3008

All fields that are set in the GHCB should have their associated bit in
the GHCB ValidBitmap field set. Add support to set the bits for the
software exit information fields when performing a VMGEXIT (SwExitCode,
SwExitInfo1, SwExitInfo2).

Fixes: 20da7ca42a33d3ef767ce4129f11496af7f67c9f
Cc: Eric Dong <eric.dong at intel.com>
Cc: Ray Ni <ray.ni at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Rahul Kumar <rahul1.kumar at intel.com>
Acked-by: Ray Ni <ray.ni at intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
 UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
index 5d30f35b201c..5532a1d391bc 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/X64/MpFuncs.nasm
@@ -533,6 +533,12 @@ BITS 64
 
     mov        rax, 0x80000004   ; VMGEXIT AP_RESET_HOLD
     mov        [rdx + 0x390], rax
+    mov        rax, 114          ; Set SwExitCode valid bit
+    bts        [rdx + 0x3f0], rax
+    inc        rax               ; Set SwExitInfo1 valid bit
+    bts        [rdx + 0x3f0], rax
+    inc        rax               ; Set SwExitInfo2 valid bit
+    bts        [rdx + 0x3f0], rax
 
     pop        rdx
     pop        rcx
-- 
2.28.0



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