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Message-ID: <20090410023610.GM27788@x200.localdomain>
Date: Fri, 10 Apr 2009 06:36:10 +0400
From: Alexey Dobriyan <adobriyan@...il.com>
To: akpm@...ux-foundation.org, containers@...ts.linux-foundation.org
Cc: xemul@...allels.com, serue@...ibm.com, dave@...ux.vnet.ibm.com,
mingo@...e.hu, orenl@...columbia.edu, hch@...radead.org,
torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 12/30] cr: i386 xstate support
Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
include/linux/cr.h | 3 +++
kernel/cr/cr-x86_32.c | 49 ++++++++++++++++++++++++++++++++++++++++++-------
2 files changed, 45 insertions(+), 7 deletions(-)
--- a/include/linux/cr.h
+++ b/include/linux/cr.h
@@ -96,6 +96,9 @@ struct cr_image_arch_x86_32 {
__u32 cr_dr7;
__u64 cr_tls_array[3];
+
+ __u32 cr_len_xstate;
+ /* __u8 cr_xstate[cr_len_xstate]; */
} __packed;
struct cr_image_mm_struct {
--- a/kernel/cr/cr-x86_32.c
+++ b/kernel/cr/cr-x86_32.c
@@ -1,5 +1,6 @@
/* Copyright (C) 2000-2009 Parallels Holdings, Ltd. */
#include <linux/sched.h>
+#include <asm/i387.h>
#include <linux/cr.h>
#include "cr.h"
@@ -23,22 +24,30 @@ __u32 cr_task_struct_arch(struct task_struct *tsk)
int cr_arch_check_image_task_struct(struct cr_image_task_struct *i)
{
+ struct cr_image_arch_x86_32 *arch_i = (struct cr_image_arch_x86_32 *)(i + 1);
+ unsigned int len_xstate = arch_i->cr_len_xstate;
+
if (i->cr_tsk_arch != CR_ARCH_X86_32)
return -EINVAL;
+ if (len_xstate > 0 && len_xstate != xstate_size) {
+ WARN(1, "xstate size mismatch %u:%u, tsk '%s'\n", len_xstate, xstate_size, i->cr_comm);
+ return -EINVAL;
+ }
return 0;
}
unsigned int cr_arch_len_task_struct(struct task_struct *tsk)
{
- return sizeof(struct cr_image_arch_x86_32);
+ unsigned int len;
+
+ len = sizeof(struct cr_image_arch_x86_32);
+ if (tsk->thread.xstate)
+ len += xstate_size;
+ return len;
}
int cr_arch_check_task_struct(struct task_struct *tsk)
{
- if (tsk->thread.xstate) {
- WARN_ON(1);
- return -EINVAL;
- }
if (tsk->thread.vm86_info) {
WARN_ON(1);
return -EINVAL;
@@ -97,6 +106,26 @@ static u16 decode_segment(__u16 reg)
BUG();
}
+static int cr_dump_xstate(struct cr_context *ctx, struct task_struct *tsk)
+{
+ if (tsk->thread.xstate)
+ return cr_write(ctx, tsk->thread.xstate, xstate_size);
+ return 0;
+}
+
+static int cr_restore_xstate(struct task_struct *tsk, void *xstate, unsigned int len)
+{
+ int rv;
+
+ if (len == 0)
+ return 0;
+
+ rv = init_fpu(tsk);
+ if (rv == 0)
+ memcpy(tsk->thread.xstate, xstate, len);
+ return rv;
+}
+
int cr_arch_dump_task_struct(struct cr_context *ctx, struct task_struct *tsk)
{
struct cr_image_arch_x86_32 *i;
@@ -137,9 +166,15 @@ int cr_arch_dump_task_struct(struct cr_context *ctx, struct task_struct *tsk)
BUILD_BUG_ON(sizeof(tsk->thread.tls_array) != 3 * 8);
memcpy(i->cr_tls_array, tsk->thread.tls_array, sizeof(i->cr_tls_array));
+ i->cr_len_xstate = 0;
+ if (tsk->thread.xstate)
+ i->cr_len_xstate = xstate_size;
+
rv = cr_write(ctx, i, sizeof(*i));
kfree(i);
- return rv;
+ if (rv < 0)
+ return rv;
+ return cr_dump_xstate(ctx, tsk);
}
asmlinkage void ret_from_fork(void);
@@ -179,7 +214,7 @@ static int cr_restore_task_struct_x86_32(struct task_struct *tsk, struct cr_imag
memcpy(tsk->thread.tls_array, i->cr_tls_array, 3 * 8);
- return 0;
+ return cr_restore_xstate(tsk, i + 1, i->cr_len_xstate);
}
int cr_arch_restore_task_struct(struct task_struct *tsk, struct cr_image_task_struct *i)
--
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