1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
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 decompressor 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_ptr);
if (et == EFI_TYPE_NONE)
return false;
ret = efi_get_conf_table(boot_params_ptr, &cfg_table_pa, &cfg_table_len);
if (ret) {
warn("EFI config table not found.");
return false;
}
table = (void *)efi_find_vendor_table(boot_params_ptr, 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;
}
|
