diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/coco/tdx/tdcall.S | 46 |
1 files changed, 28 insertions, 18 deletions
diff --git a/arch/x86/coco/tdx/tdcall.S b/arch/x86/coco/tdx/tdcall.S index 74b108e94a0d..a9bb4cbb8197 100644 --- a/arch/x86/coco/tdx/tdcall.S +++ b/arch/x86/coco/tdx/tdcall.S @@ -124,19 +124,26 @@ SYM_FUNC_START(__tdx_hypercall) push %r14 push %r13 push %r12 + push %rbp + + /* Free RDI and RSI to be used as TDVMCALL arguments */ + movq %rdi, %rax + movq %rsi, %rbp + + /* Copy hypercall registers from arg struct: */ + movq TDX_HYPERCALL_r10(%rax), %r10 + movq TDX_HYPERCALL_r11(%rax), %r11 + movq TDX_HYPERCALL_r12(%rax), %r12 + movq TDX_HYPERCALL_r13(%rax), %r13 + movq TDX_HYPERCALL_r14(%rax), %r14 + movq TDX_HYPERCALL_r15(%rax), %r15 + + push %rax /* Mangle function call ABI into TDCALL ABI: */ /* Set TDCALL leaf ID (TDVMCALL (0)) in RAX */ xor %eax, %eax - /* Copy hypercall registers from arg struct: */ - movq TDX_HYPERCALL_r10(%rdi), %r10 - movq TDX_HYPERCALL_r11(%rdi), %r11 - movq TDX_HYPERCALL_r12(%rdi), %r12 - movq TDX_HYPERCALL_r13(%rdi), %r13 - movq TDX_HYPERCALL_r14(%rdi), %r14 - movq TDX_HYPERCALL_r15(%rdi), %r15 - movl $TDVMCALL_EXPOSE_REGS_MASK, %ecx /* @@ -148,7 +155,7 @@ SYM_FUNC_START(__tdx_hypercall) * HLT operation indefinitely. Since this is the not the desired * result, conditionally call STI before TDCALL. */ - testq $TDX_HCALL_ISSUE_STI, %rsi + testq $TDX_HCALL_ISSUE_STI, %rbp jz .Lskip_sti sti .Lskip_sti: @@ -165,20 +172,22 @@ SYM_FUNC_START(__tdx_hypercall) testq %rax, %rax jne .Lpanic - /* TDVMCALL leaf return code is in R10 */ - movq %r10, %rax + pop %rax /* Copy hypercall result registers to arg struct if needed */ - testq $TDX_HCALL_HAS_OUTPUT, %rsi + testq $TDX_HCALL_HAS_OUTPUT, %rbp jz .Lout - movq %r10, TDX_HYPERCALL_r10(%rdi) - movq %r11, TDX_HYPERCALL_r11(%rdi) - movq %r12, TDX_HYPERCALL_r12(%rdi) - movq %r13, TDX_HYPERCALL_r13(%rdi) - movq %r14, TDX_HYPERCALL_r14(%rdi) - movq %r15, TDX_HYPERCALL_r15(%rdi) + movq %r10, TDX_HYPERCALL_r10(%rax) + movq %r11, TDX_HYPERCALL_r11(%rax) + movq %r12, TDX_HYPERCALL_r12(%rax) + movq %r13, TDX_HYPERCALL_r13(%rax) + movq %r14, TDX_HYPERCALL_r14(%rax) + movq %r15, TDX_HYPERCALL_r15(%rax) .Lout: + /* TDVMCALL leaf return code is in R10 */ + movq %r10, %rax + /* * Zero out registers exposed to the VMM to avoid speculative execution * with VMM-controlled values. This needs to include all registers @@ -189,6 +198,7 @@ SYM_FUNC_START(__tdx_hypercall) xor %r11d, %r11d /* Restore callee-saved GPRs as mandated by the x86_64 ABI */ + pop %rbp pop %r12 pop %r13 pop %r14 |