The following commit has been merged into the x86/tdx branch of tip:
Commit-ID: 564ea84c8c14b007d7838bfb1327295b873573be
Gitweb: https://git.kernel.org/tip/564ea84c8c14b007d7838bfb1327295b873573be
Author: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 02 Dec 2024 09:24:58 +02:00
Committer: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CommitterDate: Thu, 05 Dec 2024 10:27:07 -08:00
x86/tdx: Dump attributes and TD_CTLS on boot
Dump TD configuration on boot. Attributes and TD_CTLS define TD
behavior. This information is useful for tracking down bugs.
The output ends up looking like this in practice:
[ 0.000000] tdx: Guest detected
[ 0.000000] tdx: Attributes: SEPT_VE_DISABLE
[ 0.000000] tdx: TD_CTLS: PENDING_VE_DISABLE ENUM_TOPOLOGY VIRT_CPUID2 REDUCE_VE
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Reviewed-by: Nikolay Borisov <nik.borisov@xxxxxxxx>
Link: https://lore.kernel.org/all/20241202072458.447455-1-kirill.shutemov%40linux.intel.com
---
arch/x86/coco/tdx/Makefile | 2 +-
arch/x86/coco/tdx/debug.c | 69 ++++++++++++++++++++++++++++++-
arch/x86/coco/tdx/tdx.c | 27 ++++++++----
arch/x86/include/asm/shared/tdx.h | 39 +++++++++++++++--
arch/x86/include/asm/tdx.h | 3 +-
5 files changed, 128 insertions(+), 12 deletions(-)
create mode 100644 arch/x86/coco/tdx/debug.c
diff --git a/arch/x86/coco/tdx/Makefile b/arch/x86/coco/tdx/Makefile
index 2c7dcbf..b3c47d3 100644
--- a/arch/x86/coco/tdx/Makefile
+++ b/arch/x86/coco/tdx/Makefile
@@ -1,3 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
-obj-y += tdx.o tdx-shared.o tdcall.o
+obj-y += debug.o tdcall.o tdx.o tdx-shared.o
diff --git a/arch/x86/coco/tdx/debug.c b/arch/x86/coco/tdx/debug.c
new file mode 100644
index 0000000..cef847c
--- /dev/null
+++ b/arch/x86/coco/tdx/debug.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#undef pr_fmt
+#define pr_fmt(fmt) "tdx: " fmt
+
+#include <linux/array_size.h>
+#include <linux/printk.h>
+#include <asm/tdx.h>
+
+#define DEF_TDX_ATTR_NAME(_name) [TDX_ATTR_##_name##_BIT] = __stringify(_name)
+
+static __initdata const char *tdx_attributes[] = {
+ DEF_TDX_ATTR_NAME(DEBUG),
+ DEF_TDX_ATTR_NAME(HGS_PLUS_PROF),
+ DEF_TDX_ATTR_NAME(PERF_PROF),
+ DEF_TDX_ATTR_NAME(PMT_PROF),
+ DEF_TDX_ATTR_NAME(ICSSD),
+ DEF_TDX_ATTR_NAME(LASS),
+ DEF_TDX_ATTR_NAME(SEPT_VE_DISABLE),
+ DEF_TDX_ATTR_NAME(MIGRTABLE),
+ DEF_TDX_ATTR_NAME(PKS),
+ DEF_TDX_ATTR_NAME(KL),
+ DEF_TDX_ATTR_NAME(TPA),
+ DEF_TDX_ATTR_NAME(PERFMON),
+};
+
+#define DEF_TD_CTLS_NAME(_name) [TD_CTLS_##_name##_BIT] = __stringify(_name)
+
+static __initdata const char *tdcs_td_ctls[] = {
+ DEF_TD_CTLS_NAME(PENDING_VE_DISABLE),
+ DEF_TD_CTLS_NAME(ENUM_TOPOLOGY),
+ DEF_TD_CTLS_NAME(VIRT_CPUID2),
+ DEF_TD_CTLS_NAME(REDUCE_VE),
+ DEF_TD_CTLS_NAME(LOCK),
+};
+
+void __init tdx_dump_attributes(u64 td_attr)
+{
+ pr_info("Attributes:");
+
+ for (int i = 0; i < ARRAY_SIZE(tdx_attributes); i++) {
+ if (!tdx_attributes[i])
+ continue;
+ if (td_attr & BIT(i))
+ pr_cont(" %s", tdx_attributes[i]);
+ td_attr &= ~BIT(i);
+ }
+
+ if (td_attr)
+ pr_cont(" unknown:%#llx", td_attr);
+ pr_cont("\n");
+
+}
+
+void __init tdx_dump_td_ctls(u64 td_ctls)
+{
+ pr_info("TD_CTLS:");
+
+ for (int i = 0; i < ARRAY_SIZE(tdcs_td_ctls); i++) {
+ if (!tdcs_td_ctls[i])
+ continue;
+ if (td_ctls & BIT(i))
+ pr_cont(" %s", tdcs_td_ctls[i]);
+ td_ctls &= ~BIT(i);
+ }
+ if (td_ctls)
+ pr_cont(" unknown:%#llx", td_ctls);
+ pr_cont("\n");
+}
diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index c0ebe8c..32809a0 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -32,9 +32,6 @@
#define VE_GET_PORT_NUM(e) ((e) >> 16)
#define VE_IS_IO_STRING(e) ((e) & BIT(4))
-#define ATTR_DEBUG BIT(0)
-#define ATTR_SEPT_VE_DISABLE BIT(28)
-
/* TDX Module call error codes */
#define TDCALL_RETURN_CODE(a) ((a) >> 32)
#define TDCALL_INVALID_OPERAND 0xc0000100
@@ -200,14 +197,14 @@ static void __noreturn tdx_panic(const char *msg)
*
* TDX 1.0 does not allow the guest to disable SEPT #VE on its own. The VMM
* controls if the guest will receive such #VE with TD attribute
- * ATTR_SEPT_VE_DISABLE.
+ * TDX_ATTR_SEPT_VE_DISABLE.
*
* Newer TDX modules allow the guest to control if it wants to receive SEPT
* violation #VEs.
*
* Check if the feature is available and disable SEPT #VE if possible.
*
- * If the TD is allowed to disable/enable SEPT #VEs, the ATTR_SEPT_VE_DISABLE
+ * If the TD is allowed to disable/enable SEPT #VEs, the TDX_ATTR_SEPT_VE_DISABLE
* attribute is no longer reliable. It reflects the initial state of the
* control for the TD, but it will not be updated if someone (e.g. bootloader)
* changes it before the kernel starts. Kernel must check TDCS_TD_CTLS bit to
@@ -216,14 +213,14 @@ static void __noreturn tdx_panic(const char *msg)
static void disable_sept_ve(u64 td_attr)
{
const char *msg = "TD misconfiguration: SEPT #VE has to be disabled";
- bool debug = td_attr & ATTR_DEBUG;
+ bool debug = td_attr & TDX_ATTR_DEBUG;
u64 config, controls;
/* Is this TD allowed to disable SEPT #VE */
tdg_vm_rd(TDCS_CONFIG_FLAGS, &config);
if (!(config & TDCS_CONFIG_FLEXIBLE_PENDING_VE)) {
/* No SEPT #VE controls for the guest: check the attribute */
- if (td_attr & ATTR_SEPT_VE_DISABLE)
+ if (td_attr & TDX_ATTR_SEPT_VE_DISABLE)
return;
/* Relax SEPT_VE_DISABLE check for debug TD for backtraces */
@@ -1040,6 +1037,20 @@ static void tdx_kexec_finish(void)
}
}
+static __init void tdx_announce(void)
+{
+ struct tdx_module_args args = {};
+ u64 controls;
+
+ pr_info("Guest detected\n");
+
+ tdcall(TDG_VP_INFO, &args);
+ tdx_dump_attributes(args.rdx);
+
+ tdg_vm_rd(TDCS_TD_CTLS, &controls);
+ tdx_dump_td_ctls(controls);
+}
+
void __init tdx_early_init(void)
{
u64 cc_mask;
@@ -1109,5 +1120,5 @@ void __init tdx_early_init(void)
*/
x86_cpuinit.parallel_bringup = false;
- pr_info("Guest detected\n");
+ tdx_announce();
}
diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h
index a878c7e..fcbbef4 100644
--- a/arch/x86/include/asm/shared/tdx.h
+++ b/arch/x86/include/asm/shared/tdx.h
@@ -19,6 +19,32 @@
#define TDG_VM_RD 7
#define TDG_VM_WR 8
+/* TDX attributes */
+#define TDX_ATTR_DEBUG_BIT 0
+#define TDX_ATTR_DEBUG BIT_ULL(TDX_ATTR_DEBUG_BIT)
+#define TDX_ATTR_HGS_PLUS_PROF_BIT 4
+#define TDX_ATTR_HGS_PLUS_PROF BIT_ULL(TDX_ATTR_HGS_PLUS_PROF_BIT)
+#define TDX_ATTR_PERF_PROF_BIT 5
+#define TDX_ATTR_PERF_PROF BIT_ULL(TDX_ATTR_PERF_PROF_BIT)
+#define TDX_ATTR_PMT_PROF_BIT 6
+#define TDX_ATTR_PMT_PROF BIT_ULL(TDX_ATTR_PMT_PROF_BIT)
+#define TDX_ATTR_ICSSD_BIT 16
+#define TDX_ATTR_ICSSD BIT_ULL(TDX_ATTR_ICSSD_BIT)
+#define TDX_ATTR_LASS_BIT 27
+#define TDX_ATTR_LASS BIT_ULL(TDX_ATTR_LASS_BIT)
+#define TDX_ATTR_SEPT_VE_DISABLE_BIT 28
+#define TDX_ATTR_SEPT_VE_DISABLE BIT_ULL(TDX_ATTR_SEPT_VE_DISABLE_BIT)
+#define TDX_ATTR_MIGRTABLE_BIT 29
+#define TDX_ATTR_MIGRTABLE BIT_ULL(TDX_ATTR_MIGRTABLE_BIT)
+#define TDX_ATTR_PKS_BIT 30
+#define TDX_ATTR_PKS BIT_ULL(TDX_ATTR_PKS_BIT)
+#define TDX_ATTR_KL_BIT 31
+#define TDX_ATTR_KL BIT_ULL(TDX_ATTR_KL_BIT)
+#define TDX_ATTR_TPA_BIT 62
+#define TDX_ATTR_TPA BIT_ULL(TDX_ATTR_TPA_BIT)
+#define TDX_ATTR_PERFMON_BIT 63
+#define TDX_ATTR_PERFMON BIT_ULL(TDX_ATTR_PERFMON_BIT)
+
/* TDX TD-Scope Metadata. To be used by TDG.VM.WR and TDG.VM.RD */
#define TDCS_CONFIG_FLAGS 0x1110000300000016
#define TDCS_TD_CTLS 0x1110000300000017
@@ -29,9 +55,16 @@
#define TDCS_CONFIG_FLEXIBLE_PENDING_VE BIT_ULL(1)
/* TDCS_TD_CTLS bits */
-#define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(0)
-#define TD_CTLS_ENUM_TOPOLOGY BIT_ULL(1)
-#define TD_CTLS_REDUCE_VE BIT_ULL(3)
+#define TD_CTLS_PENDING_VE_DISABLE_BIT 0
+#define TD_CTLS_PENDING_VE_DISABLE BIT_ULL(TD_CTLS_PENDING_VE_DISABLE_BIT)
+#define TD_CTLS_ENUM_TOPOLOGY_BIT 1
+#define TD_CTLS_ENUM_TOPOLOGY BIT_ULL(TD_CTLS_ENUM_TOPOLOGY_BIT)
+#define TD_CTLS_VIRT_CPUID2_BIT 2
+#define TD_CTLS_VIRT_CPUID2 BIT_ULL(TD_CTLS_VIRT_CPUID2_BIT)
+#define TD_CTLS_REDUCE_VE_BIT 3
+#define TD_CTLS_REDUCE_VE BIT_ULL(TD_CTLS_REDUCE_VE_BIT)
+#define TD_CTLS_LOCK_BIT 63
+#define TD_CTLS_LOCK BIT_ULL(TD_CTLS_LOCK_BIT)
/* TDX hypercall Leaf IDs */
#define TDVMCALL_MAP_GPA 0x10001
diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
index eba1789..b4b16da 100644
--- a/arch/x86/include/asm/tdx.h
+++ b/arch/x86/include/asm/tdx.h
@@ -66,6 +66,9 @@ int tdx_mcall_get_report0(u8 *reportdata, u8 *tdreport);
u64 tdx_hcall_get_quote(u8 *buf, size_t size);
+void __init tdx_dump_attributes(u64 td_attr);
+void __init tdx_dump_td_ctls(u64 td_ctls);
+
#else
static inline void tdx_early_init(void) { };
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