Author: grehan
Date: Wed Dec 12 08:35:32 2012
New Revision: 244144
URL: http://svnweb.freebsd.org/changeset/base/244144
Log:
Implement an API to allow a hypervisor to save/restore
guest floating point state without having to know the
size of floating-point state.
Unstaticize fpurestore to allow the hypervisor to
save/restore guest state using fpusave/fpurestore
on the allocated FPU state area.
Reviewed by: kib
Obtained from: NetApp/bhyve
MFC after: 1 week
Modified:
head/sys/amd64/amd64/fpu.c
head/sys/amd64/include/fpu.h
Modified: head/sys/amd64/amd64/fpu.c
==============================================================================
--- head/sys/amd64/amd64/fpu.c Wed Dec 12 07:29:38 2012 (r244143)
+++ head/sys/amd64/amd64/fpu.c Wed Dec 12 08:35:32 2012 (r244144)
@@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/signalvar.h>
+#include <vm/uma.h>
#include <machine/cputypes.h>
#include <machine/frame.h>
@@ -134,6 +135,7 @@ SYSCTL_INT(_hw, HW_FLOATINGPT, floatingp
static int use_xsaveopt;
int use_xsave; /* non-static for cpu_switch.S */
uint64_t xsave_mask; /* the same */
+static uma_zone_t fpu_save_area_zone;
static struct savefpu *fpu_initialstate;
struct xsave_area_elm_descr {
@@ -151,7 +153,7 @@ fpusave(void *addr)
fxsave((char *)addr);
}
-static void
+void
fpurestore(void *addr)
{
@@ -312,6 +314,10 @@ fpuinitstate(void *arg __unused)
}
}
+ fpu_save_area_zone = uma_zcreate("FPU_save_area",
+ cpu_max_ext_state_size, NULL, NULL, NULL, NULL,
+ XSAVE_AREA_ALIGN - 1, 0);
+
start_emulating();
intr_restore(saveintr);
}
@@ -980,3 +986,27 @@ is_fpu_kern_thread(u_int flags)
return (0);
return ((curpcb->pcb_flags & PCB_KERNFPU) != 0);
}
+
+/*
+ * FPU save area alloc/free/init utility routines
+ */
+struct savefpu *
+fpu_save_area_alloc(void)
+{
+
+ return (uma_zalloc(fpu_save_area_zone, 0));
+}
+
+void
+fpu_save_area_free(struct savefpu *fsa)
+{
+
+ uma_zfree(fpu_save_area_zone, fsa);
+}
+
+void
+fpu_save_area_reset(struct savefpu *fsa)
+{
+
+ bcopy(fpu_initialstate, fsa, cpu_max_ext_state_size);
+}
Modified: head/sys/amd64/include/fpu.h
==============================================================================
--- head/sys/amd64/include/fpu.h Wed Dec 12 07:29:38 2012
(r244143)
+++ head/sys/amd64/include/fpu.h Wed Dec 12 08:35:32 2012
(r244144)
@@ -57,6 +57,7 @@ void fpuexit(struct thread *td);
int fpuformat(void);
int fpugetregs(struct thread *td);
void fpuinit(void);
+void fpurestore(void *addr);
void fpusave(void *addr);
int fpusetregs(struct thread *td, struct savefpu *addr,
char *xfpustate, size_t xfpustate_size);
@@ -73,6 +74,10 @@ int fpu_kern_leave(struct thread *td, st
int fpu_kern_thread(u_int flags);
int is_fpu_kern_thread(u_int flags);
+struct savefpu *fpu_save_area_alloc(void);
+void fpu_save_area_free(struct savefpu *fsa);
+void fpu_save_area_reset(struct savefpu *fsa);
+
/*
* Flags for fpu_kern_alloc_ctx(), fpu_kern_enter() and fpu_kern_thread().
*/
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