svn commit: r285290 - in head/sys: amd64/amd64 i386/isa
John-Mark Gurney
jmg at FreeBSD.org
Wed Jul 8 19:26:37 UTC 2015
Author: jmg
Date: Wed Jul 8 19:26:36 2015
New Revision: 285290
URL: https://svnweb.freebsd.org/changeset/base/285290
Log:
Now that aesni won't reuse fpu contexts (D3016), add seatbelts to the
fpu code to prevent other reuse of the contexts in the future...
Differential Revision: https://reviews.freebsd.org/D3015
Reviewed by: kib, gnn
Modified:
head/sys/amd64/amd64/fpu.c
head/sys/i386/isa/npx.c
Modified: head/sys/amd64/amd64/fpu.c
==============================================================================
--- head/sys/amd64/amd64/fpu.c Wed Jul 8 19:15:29 2015 (r285289)
+++ head/sys/amd64/amd64/fpu.c Wed Jul 8 19:26:36 2015 (r285290)
@@ -916,6 +916,7 @@ static MALLOC_DEFINE(M_FPUKERN_CTX, "fpu
#define FPU_KERN_CTX_FPUINITDONE 0x01
#define FPU_KERN_CTX_DUMMY 0x02 /* avoided save for the kern thread */
+#define FPU_KERN_CTX_INUSE 0x04
struct fpu_kern_ctx {
struct savefpu *prev;
@@ -940,6 +941,7 @@ void
fpu_kern_free_ctx(struct fpu_kern_ctx *ctx)
{
+ KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) == 0, ("free'ing inuse ctx"));
/* XXXKIB clear the memory ? */
free(ctx, M_FPUKERN_CTX);
}
@@ -959,14 +961,16 @@ fpu_kern_enter(struct thread *td, struct
{
struct pcb *pcb;
+ KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) == 0, ("using inuse ctx"));
+
if ((flags & FPU_KERN_KTHR) != 0 && is_fpu_kern_thread(0)) {
- ctx->flags = FPU_KERN_CTX_DUMMY;
+ ctx->flags = FPU_KERN_CTX_DUMMY | FPU_KERN_CTX_INUSE;
return (0);
}
pcb = td->td_pcb;
KASSERT(!PCB_USER_FPU(pcb) || pcb->pcb_save ==
get_pcb_user_save_pcb(pcb), ("mangled pcb_save"));
- ctx->flags = 0;
+ ctx->flags = FPU_KERN_CTX_INUSE;
if ((pcb->pcb_flags & PCB_FPUINITDONE) != 0)
ctx->flags |= FPU_KERN_CTX_FPUINITDONE;
fpuexit(td);
@@ -982,6 +986,10 @@ fpu_kern_leave(struct thread *td, struct
{
struct pcb *pcb;
+ KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) != 0,
+ ("leaving not inuse ctx"));
+ ctx->flags &= ~FPU_KERN_CTX_INUSE;
+
if (is_fpu_kern_thread(0) && (ctx->flags & FPU_KERN_CTX_DUMMY) != 0)
return (0);
KASSERT((ctx->flags & FPU_KERN_CTX_DUMMY) == 0, ("dummy ctx"));
Modified: head/sys/i386/isa/npx.c
==============================================================================
--- head/sys/i386/isa/npx.c Wed Jul 8 19:15:29 2015 (r285289)
+++ head/sys/i386/isa/npx.c Wed Jul 8 19:26:36 2015 (r285290)
@@ -1359,6 +1359,7 @@ static MALLOC_DEFINE(M_FPUKERN_CTX, "fpu
#define FPU_KERN_CTX_NPXINITDONE 0x01
#define FPU_KERN_CTX_DUMMY 0x02
+#define FPU_KERN_CTX_INUSE 0x04
struct fpu_kern_ctx {
union savefpu *prev;
@@ -1383,6 +1384,7 @@ void
fpu_kern_free_ctx(struct fpu_kern_ctx *ctx)
{
+ KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) == 0, ("free'ing inuse ctx"));
/* XXXKIB clear the memory ? */
free(ctx, M_FPUKERN_CTX);
}
@@ -1402,14 +1404,16 @@ fpu_kern_enter(struct thread *td, struct
{
struct pcb *pcb;
+ KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) == 0, ("using inuse ctx"));
+
if ((flags & FPU_KERN_KTHR) != 0 && is_fpu_kern_thread(0)) {
- ctx->flags = FPU_KERN_CTX_DUMMY;
+ ctx->flags = FPU_KERN_CTX_DUMMY | FPU_KERN_CTX_INUSE;
return (0);
}
pcb = td->td_pcb;
KASSERT(!PCB_USER_FPU(pcb) || pcb->pcb_save ==
get_pcb_user_save_pcb(pcb), ("mangled pcb_save"));
- ctx->flags = 0;
+ ctx->flags = FPU_KERN_CTX_INUSE;
if ((pcb->pcb_flags & PCB_NPXINITDONE) != 0)
ctx->flags |= FPU_KERN_CTX_NPXINITDONE;
npxexit(td);
@@ -1425,6 +1429,10 @@ fpu_kern_leave(struct thread *td, struct
{
struct pcb *pcb;
+ KASSERT((ctx->flags & FPU_KERN_CTX_INUSE) != 0,
+ ("leaving not inuse ctx"));
+ ctx->flags &= ~FPU_KERN_CTX_INUSE;
+
if (is_fpu_kern_thread(0) && (ctx->flags & FPU_KERN_CTX_DUMMY) != 0)
return (0);
pcb = td->td_pcb;
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