[Xen-devel] [PATCH 2/3] x86/spec-ctrl: Add defines and variables for AMD SSBD support

[Brian Woods <brian.woods@xxxxxxx>]

In preparation for adding switchable SSBD, add some defines and
variables.

Signed-off-by: Brian Woods <brian.woods@xxxxxxx>
---
 xen/arch/x86/spec_ctrl.c        | 10 ++++++++++
 xen/include/asm-x86/spec_ctrl.h |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index 62e6519d93..baef907322 100644
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -19,6 +19,7 @@
 #include <xen/errno.h>
 #include <xen/init.h>
 #include <xen/lib.h>
+#include <xen/spinlock.h>
 
 #include <asm/microcode.h>
 #include <asm/msr.h>
@@ -50,7 +51,16 @@ bool __initdata bsp_delay_spec_ctrl;
 uint8_t __read_mostly default_xen_spec_ctrl;
 uint8_t __read_mostly default_spec_ctrl_flags;
 
+/* for SSBD support for AMD via LS_CFG */
+#define SSBD_AMD_MAX_SOCKET 2
+struct ssbd_amd_ls_cfg_smt_status {
+    spinlock_t lock;
+    uint32_t mask;
+} __attribute__ ((aligned (64)));
+bool __read_mostly ssbd_amd_smt_en = false;
+bool __read_mostly xen_ssbd_amd_ls_cfg_en = false;
 uint64_t __read_mostly ssbd_amd_ls_cfg_mask = 0ull;
+struct ssbd_amd_ls_cfg_smt_status *ssbd_amd_smt_status[SSBD_AMD_MAX_SOCKET] = 
{NULL};
 
 static int __init parse_bti(const char *s)
 {
diff --git a/xen/include/asm-x86/spec_ctrl.h b/xen/include/asm-x86/spec_ctrl.h
index 6aebfa9e4f..c47647771a 100644
--- a/xen/include/asm-x86/spec_ctrl.h
+++ b/xen/include/asm-x86/spec_ctrl.h
@@ -39,6 +39,9 @@ extern uint8_t opt_xpti;
 #define OPT_XPTI_DOMU  0x02
 
 extern uint64_t ssbd_amd_ls_cfg_mask;
+extern bool xen_ssbd_amd_ls_cfg_en;
+extern void ssbd_amd_ls_cfg_init(void);
+extern void ssbd_amd_ls_cfg_set(bool enable_ssbd);
 
 static inline void init_shadow_spec_ctrl_state(void)
 {
-- 
2.11.0


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