According to GHCI Spec Table 2-1, in TDVMCALL R10 should be cleared
to 0 in input operands, and be checked for the return result.
https://cdrdv2.intel.com/v1/dl/getContent/726790
Cc: Erdem Aktas <erdemak...@google.com>
Cc: Gerd Hoffmann <kra...@redhat.com>
Cc: James Bottomley <j...@linux.ibm.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Cc: Tom Lendacky <thomas.lenda...@amd.com>
Signed-off-by: Min Xu <min.m...@intel.com>
---
OvmfPkg/TdxDxe/X64/ApRunLoop.nasm | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
b/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
index 52fb3b4944bf..0bef89c48552 100644
--- a/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
+++ b/OvmfPkg/TdxDxe/X64/ApRunLoop.nasm
@@ -42,10 +42,11 @@ AsmRelocateApMailBoxLoopStart:
mov rax, TDVMCALL
mov rcx, TDVMCALL_EXPOSE_REGS_MASK
+ xor r10, r10
mov r11, EXIT_REASON_CPUID
mov r12, 0xb
tdcall
- test rax, rax
+ test r10, r10
jnz Panic
mov r8, r15
--
2.29.2.windows.2
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