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-rw-r--r--arch/x86/boot/compressed/mem.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/mem.c b/arch/x86/boot/compressed/mem.c
new file mode 100644
index 0000000000..3c1609245f
--- /dev/null
+++ b/arch/x86/boot/compressed/mem.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include "error.h"
+#include "misc.h"
+#include "tdx.h"
+#include "sev.h"
+#include <asm/shared/tdx.h>
+
+/*
+ * accept_memory() and process_unaccepted_memory() called from EFI stub which
+ * runs before decompresser and its early_tdx_detect().
+ *
+ * Enumerate TDX directly from the early users.
+ */
+static bool early_is_tdx_guest(void)
+{
+ static bool once;
+ static bool is_tdx;
+
+ if (!IS_ENABLED(CONFIG_INTEL_TDX_GUEST))
+ return false;
+
+ if (!once) {
+ u32 eax, sig[3];
+
+ cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax,
+ &sig[0], &sig[2], &sig[1]);
+ is_tdx = !memcmp(TDX_IDENT, sig, sizeof(sig));
+ once = true;
+ }
+
+ return is_tdx;
+}
+
+void arch_accept_memory(phys_addr_t start, phys_addr_t end)
+{
+ /* Platform-specific memory-acceptance call goes here */
+ if (early_is_tdx_guest()) {
+ if (!tdx_accept_memory(start, end))
+ panic("TDX: Failed to accept memory\n");
+ } else if (sev_snp_enabled()) {
+ snp_accept_memory(start, end);
+ } else {
+ error("Cannot accept memory: unknown platform\n");
+ }
+}
+
+bool init_unaccepted_memory(void)
+{
+ guid_t guid = LINUX_EFI_UNACCEPTED_MEM_TABLE_GUID;
+ struct efi_unaccepted_memory *table;
+ unsigned long cfg_table_pa;
+ unsigned int cfg_table_len;
+ enum efi_type et;
+ int ret;
+
+ et = efi_get_type(boot_params);
+ if (et == EFI_TYPE_NONE)
+ return false;
+
+ ret = efi_get_conf_table(boot_params, &cfg_table_pa, &cfg_table_len);
+ if (ret) {
+ warn("EFI config table not found.");
+ return false;
+ }
+
+ table = (void *)efi_find_vendor_table(boot_params, cfg_table_pa,
+ cfg_table_len, guid);
+ if (!table)
+ return false;
+
+ if (table->version != 1)
+ error("Unknown version of unaccepted memory table\n");
+
+ /*
+ * In many cases unaccepted_table is already set by EFI stub, but it
+ * has to be initialized again to cover cases when the table is not
+ * allocated by EFI stub or EFI stub copied the kernel image with
+ * efi_relocate_kernel() before the variable is set.
+ *
+ * It must be initialized before the first usage of accept_memory().
+ */
+ unaccepted_table = table;
+
+ return true;
+}