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Diffstat (limited to 'arch/x86/coco/tdx/tdx-shared.c')
-rw-r--r--arch/x86/coco/tdx/tdx-shared.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/arch/x86/coco/tdx/tdx-shared.c b/arch/x86/coco/tdx/tdx-shared.c
index ef20ddc37b..78e4132697 100644
--- a/arch/x86/coco/tdx/tdx-shared.c
+++ b/arch/x86/coco/tdx/tdx-shared.c
@@ -5,7 +5,7 @@ static unsigned long try_accept_one(phys_addr_t start, unsigned long len,
enum pg_level pg_level)
{
unsigned long accept_size = page_level_size(pg_level);
- u64 tdcall_rcx;
+ struct tdx_module_args args = {};
u8 page_size;
if (!IS_ALIGNED(start, accept_size))
@@ -34,8 +34,8 @@ static unsigned long try_accept_one(phys_addr_t start, unsigned long len,
return 0;
}
- tdcall_rcx = start | page_size;
- if (__tdx_module_call(TDX_ACCEPT_PAGE, tdcall_rcx, 0, 0, 0, NULL))
+ args.rcx = start | page_size;
+ if (__tdcall(TDG_MEM_PAGE_ACCEPT, &args))
return 0;
return accept_size;
@@ -45,7 +45,7 @@ bool tdx_accept_memory(phys_addr_t start, phys_addr_t end)
{
/*
* For shared->private conversion, accept the page using
- * TDX_ACCEPT_PAGE TDX module call.
+ * TDG_MEM_PAGE_ACCEPT TDX module call.
*/
while (start < end) {
unsigned long len = end - start;
@@ -69,3 +69,23 @@ bool tdx_accept_memory(phys_addr_t start, phys_addr_t end)
return true;
}
+
+noinstr u64 __tdx_hypercall(struct tdx_module_args *args)
+{
+ /*
+ * For TDVMCALL explicitly set RCX to the bitmap of shared registers.
+ * The caller isn't expected to set @args->rcx anyway.
+ */
+ args->rcx = TDVMCALL_EXPOSE_REGS_MASK;
+
+ /*
+ * Failure of __tdcall_saved_ret() indicates a failure of the TDVMCALL
+ * mechanism itself and that something has gone horribly wrong with
+ * the TDX module. __tdx_hypercall_failed() never returns.
+ */
+ if (__tdcall_saved_ret(TDG_VP_VMCALL, args))
+ __tdx_hypercall_failed();
+
+ /* TDVMCALL leaf return code is in R10 */
+ return args->r10;
+}