linux-kernel - [PATCH v7 02/26] x86/fpu/xstate: Modify state copy helpers to handle both static and dynamic buffers

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Date:   Sat, 10 Jul 2021 06:02:49 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     bp@...e.de, luto@...nel.org, tglx@...utronix.de, mingo@...nel.org,
        x86@...nel.org
Cc:     len.brown@...el.com, dave.hansen@...el.com,
        thiago.macieira@...el.com, jing2.liu@...el.com,
        ravi.v.shankar@...el.com, linux-kernel@...r.kernel.org,
        chang.seok.bae@...el.com
Subject: [PATCH v7 02/26] x86/fpu/xstate: Modify state copy helpers to handle both static and dynamic buffers

Have all the functions copying XSTATE take a struct fpu * pointer in
preparation for dynamic state buffer support.

No functional change.

Signed-off-by: Chang S. Bae <chang.seok.bae@...el.com>
Reviewed-by: Len Brown <len.brown@...el.com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
---
Changes from v5:
* Adjusted function prototype changes to the recent renamed on the new
  base.

Changes from v3:
* Updated the changelog. (Borislav Petkov)

Changes from v2:
* Updated the changelog with task->fpu removed. (Borislav Petkov)
---
 arch/x86/include/asm/fpu/xstate.h |  4 ++--
 arch/x86/kernel/fpu/regset.c      |  2 +-
 arch/x86/kernel/fpu/signal.c      |  2 +-
 arch/x86/kernel/fpu/xstate.c      | 12 ++++++------
 4 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index 109dfcc75299..ede166e9d3f2 100644
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -136,8 +136,8 @@ extern void __init update_regset_xstate_info(unsigned int size,
 
 void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr);
 int xfeature_size(int xfeature_nr);
-int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
-int copy_sigframe_from_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
+int copy_uabi_from_kernel_to_xstate(struct fpu *fpu, const void *kbuf);
+int copy_sigframe_from_user_to_xstate(struct fpu *fpu, const void __user *ubuf);
 
 void xsaves(struct xregs_state *xsave, u64 mask);
 void xrstors(struct xregs_state *xsave, u64 mask);
diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index 66ed317ebc0d..49dd307003ec 100644
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -164,7 +164,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
 	}
 
 	fpu_force_restore(fpu);
-	ret = copy_uabi_from_kernel_to_xstate(&fpu->state.xsave, kbuf ?: tmpbuf);
+	ret = copy_uabi_from_kernel_to_xstate(fpu, kbuf ?: tmpbuf);
 
 out:
 	vfree(tmpbuf);
diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index 445c57c9c539..bec8c8046888 100644
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -371,7 +371,7 @@ static int __fpu_restore_sig(void __user *buf, void __user *buf_fx,
 	fpregs_unlock();
 
 	if (use_xsave() && !fx_only) {
-		ret = copy_sigframe_from_user_to_xstate(&fpu->state.xsave, buf_fx);
+		ret = copy_sigframe_from_user_to_xstate(fpu, buf_fx);
 		if (ret)
 			return ret;
 	} else {
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index d4fdceb9a309..59f08953201c 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1089,10 +1089,10 @@ static int copy_from_buffer(void *dst, unsigned int offset, unsigned int size,
 	return 0;
 }
 
-
-static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf,
+static int copy_uabi_to_xstate(struct fpu *fpu, const void *kbuf,
 			       const void __user *ubuf)
 {
+	struct xregs_state *xsave = &fpu->state.xsave;
 	unsigned int offset, size;
 	struct xstate_header hdr;
 	u64 mask;
@@ -1158,9 +1158,9 @@ static int copy_uabi_to_xstate(struct xregs_state *xsave, const void *kbuf,
  * format and copy to the target thread. This is called from
  * xstateregs_set().
  */
-int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
+int copy_uabi_from_kernel_to_xstate(struct fpu *fpu, const void *kbuf)
 {
-	return copy_uabi_to_xstate(xsave, kbuf, NULL);
+	return copy_uabi_to_xstate(fpu, kbuf, NULL);
 }
 
 /*
@@ -1168,10 +1168,10 @@ int copy_uabi_from_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf)
  * XSAVE[S] format and copy to the target thread. This is called from the
  * sigreturn() and rt_sigreturn() system calls.
  */
-int copy_sigframe_from_user_to_xstate(struct xregs_state *xsave,
+int copy_sigframe_from_user_to_xstate(struct fpu *fpu,
 				      const void __user *ubuf)
 {
-	return copy_uabi_to_xstate(xsave, NULL, ubuf);
+	return copy_uabi_to_xstate(fpu, NULL, ubuf);
 }
 
 static bool validate_xsaves_xrstors(u64 mask)
-- 
2.17.1