linux-kernel - [PATCH v1 1/3] x86/traps: Move DR7_RESET

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Message-ID: <20250613070118.3694407-2-xin@zytor.com>
Date: Fri, 13 Jun 2025 00:01:15 -0700
From: "Xin Li (Intel)" <xin@...or.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        seanjc@...gle.com, pbonzini@...hat.com, peterz@...radead.org,
        brgerst@...il.com, tony.luck@...el.com, fenghuay@...dia.com
Subject: [PATCH v1 1/3] x86/traps: Move DR7_RESET_VALUE to <uapi/asm/debugreg.h>

Move DR7_RESET_VALUE to <uapi/asm/debugreg.h> to prepare to write DR7
with DR7_RESET_VALUE at boot time.

Reviewed-by: H. Peter Anvin (Intel) <hpa@...or.com>
Signed-off-by: Xin Li (Intel) <xin@...or.com>
---
 arch/x86/coco/sev/core.c             | 1 +
 arch/x86/coco/sev/vc-handle.c        | 1 +
 arch/x86/include/asm/sev-internal.h  | 2 --
 arch/x86/include/uapi/asm/debugreg.h | 2 ++
 4 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index b6db4e0b936b..d62d946bbbb7 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -24,6 +24,7 @@
 #include <linux/io.h>
 #include <linux/psp-sev.h>
 #include <linux/dmi.h>
+#include <uapi/asm/debugreg.h>
 #include <uapi/linux/sev-guest.h>
 #include <crypto/gcm.h>
 
diff --git a/arch/x86/coco/sev/vc-handle.c b/arch/x86/coco/sev/vc-handle.c
index 0989d98da130..ad4437a61f61 100644
--- a/arch/x86/coco/sev/vc-handle.c
+++ b/arch/x86/coco/sev/vc-handle.c
@@ -17,6 +17,7 @@
 #include <linux/mm.h>
 #include <linux/io.h>
 #include <linux/psp-sev.h>
+#include <uapi/asm/debugreg.h>
 #include <uapi/linux/sev-guest.h>
 
 #include <asm/init.h>
diff --git a/arch/x86/include/asm/sev-internal.h b/arch/x86/include/asm/sev-internal.h
index 3dfd306d1c9e..8fc88beaf0d7 100644
--- a/arch/x86/include/asm/sev-internal.h
+++ b/arch/x86/include/asm/sev-internal.h
@@ -1,7 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 
-#define DR7_RESET_VALUE        0x400
-
 extern struct ghcb boot_ghcb_page;
 extern u64 sev_hv_features;
 extern u64 sev_secrets_pa;
diff --git a/arch/x86/include/uapi/asm/debugreg.h b/arch/x86/include/uapi/asm/debugreg.h
index 0007ba077c0c..d16f53c3a9df 100644
--- a/arch/x86/include/uapi/asm/debugreg.h
+++ b/arch/x86/include/uapi/asm/debugreg.h
@@ -28,6 +28,8 @@
 #define DR_STEP		(0x4000)	/* single-step */
 #define DR_SWITCH	(0x8000)	/* task switch */
 
+#define DR7_RESET_VALUE	(0x400)		/* Reset state of DR7 */
+
 /* Now define a bunch of things for manipulating the control register.
    The top two bytes of the control register consist of 4 fields of 4
    bits - each field corresponds to one of the four debug registers,
-- 
2.49.0