2009-11-02 15:02:29 +03:00
/ *
* This p r o g r a m i s f r e e s o f t w a r e ; you can redistribute it and/or modify
* it u n d e r t h e t e r m s o f t h e G N U G e n e r a l P u b l i c L i c e n s e , v e r s i o n 2 , a s
* published b y t h e F r e e S o f t w a r e F o u n d a t i o n .
*
* This p r o g r a m i s d i s t r i b u t e d i n t h e h o p e t h a t i t w i l l b e u s e f u l ,
* but W I T H O U T A N Y W A R R A N T Y ; without even the implied warranty of
* MERCHANTABILITY o r F I T N E S S F O R A P A R T I C U L A R P U R P O S E . S e e t h e
* GNU G e n e r a l P u b l i c L i c e n s e f o r m o r e d e t a i l s .
*
* You s h o u l d h a v e r e c e i v e d a c o p y o f t h e G N U G e n e r a l P u b l i c L i c e n s e
* along w i t h t h i s p r o g r a m ; if not, write to the Free Software
* Foundation, 5 1 F r a n k l i n S t r e e t , F i f t h F l o o r , B o s t o n , M A 0 2 1 1 0 - 1 3 0 1 , U S A .
*
* Copyright S U S E L i n u x P r o d u c t s G m b H 2 0 0 9
*
* Authors : Alexander G r a f < a g r a f @suse.de>
* /
2013-08-06 20:01:46 +04:00
# ifdef _ _ L I T T L E _ E N D I A N _ _
# error N e e d t o f i x S L B s h a d o w a c c e s s e s i n l i t t l e e n d i a n m o d e
# endif
2009-11-02 15:02:29 +03:00
# define S H A D O W _ S L B _ E S I D ( n u m ) ( S L B S H A D O W _ S A V E A R E A + ( n u m * 0 x10 ) )
# define S H A D O W _ S L B _ V S I D ( n u m ) ( S L B S H A D O W _ S A V E A R E A + ( n u m * 0 x10 ) + 0 x8 )
# define U N B O L T _ S L B _ E N T R Y ( n u m ) \
ld r9 , S H A D O W _ S L B _ E S I D ( n u m ) ( r12 ) ; \
/* Invalid? Skip. */ ; \
rldicl. r0 , r9 , 3 7 , 6 3 ; \
beq s l b _ e n t r y _ s k i p _ ## n u m ; \
xoris r9 , r9 , S L B _ E S I D _ V @h; \
std r9 , S H A D O W _ S L B _ E S I D ( n u m ) ( r12 ) ; \
slb_ e n t r y _ s k i p _ ## n u m :
# define R E B O L T _ S L B _ E N T R Y ( n u m ) \
ld r10 , S H A D O W _ S L B _ E S I D ( n u m ) ( r11 ) ; \
cmpdi r10 , 0 ; \
2010-01-05 00:19:22 +03:00
beq s l b _ e x i t _ s k i p _ ## n u m ; \
2009-11-02 15:02:29 +03:00
oris r10 , r10 , S L B _ E S I D _ V @h; \
ld r9 , S H A D O W _ S L B _ V S I D ( n u m ) ( r11 ) ; \
slbmte r9 , r10 ; \
std r10 , S H A D O W _ S L B _ E S I D ( n u m ) ( r11 ) ; \
slb_ e x i t _ s k i p _ ## n u m :
/ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* Entry c o d e *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * /
2010-04-16 02:11:48 +04:00
.macro LOAD_GUEST_SEGMENTS
2009-11-02 15:02:29 +03:00
/ * Required s t a t e :
*
* MSR = ~ I R | D R
* R1 3 = P A C A
2010-01-08 04:58:03 +03:00
* R1 = h o s t R 1
* R2 = h o s t R 2
2010-04-16 02:11:48 +04:00
* R3 = s h a d o w v c p u
2011-07-23 11:41:44 +04:00
* all o t h e r v o l a t i l e G P R S = f r e e e x c e p t R 4 , R 6
2010-04-16 02:11:48 +04:00
* SVCPU[ C R ] = g u e s t C R
* SVCPU[ X E R ] = g u e s t X E R
* SVCPU[ C T R ] = g u e s t C T R
* SVCPU[ L R ] = g u e s t L R
2009-11-02 15:02:29 +03:00
* /
/* Remove LPAR shadow entries */
# if S L B _ N U M _ B O L T E D = = 3
ld r12 , P A C A _ S L B S H A D O W P T R ( r13 )
/* Remove bolted entries */
UNBOLT_ S L B _ E N T R Y ( 0 )
UNBOLT_ S L B _ E N T R Y ( 1 )
UNBOLT_ S L B _ E N T R Y ( 2 )
# else
# error u n k n o w n n u m b e r o f b o l t e d e n t r i e s
# endif
/* Flush SLB */
KVM: PPC: Book3S PR: Fix invalidation of SLB entry 0 on guest entry
On entering a PR KVM guest, we invalidate the whole SLB before loading
up the guest entries. We do this using an slbia instruction, which
invalidates all entries except entry 0, followed by an slbie to
invalidate entry 0. However, the slbie turns out to be ineffective
in some circumstances (specifically when the host linear mapping uses
64k pages) because of errors in computing the parameter to the slbie.
The result is that the guest kernel hangs very early in boot because
it takes a DSI the first time it tries to access kernel data using
a linear mapping address in real mode.
Currently we construct bits 36 - 43 (big-endian numbering) of the slbie
parameter by taking bits 56 - 63 of the SLB VSID doubleword. These bits
for the tlbie are C (class, 1 bit), B (segment size, 2 bits) and 5
reserved bits. For the SLB VSID doubleword these are C (class, 1 bit),
reserved (1 bit), LP (large page size, 2 bits), and 4 reserved bits.
Thus we are not setting the B field correctly, and when LP = 01 as
it is for 64k pages, we are setting a reserved bit.
Rather than add more instructions to calculate the slbie parameter
correctly, this takes a simpler approach, which is to set entry 0 to
zeroes explicitly. Normally slbmte should not be used to invalidate
an entry, since it doesn't invalidate the ERATs, but it is OK to use
it to invalidate an entry if it is immediately followed by slbia,
which does invalidate the ERATs. (This has been confirmed with the
Power architects.) This approach takes fewer instructions and will
work whatever the contents of entry 0.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2013-06-22 11:14:11 +04:00
li r10 , 0
slbmte r10 , r10
2009-11-02 15:02:29 +03:00
slbia
/* Fill SLB with our shadow */
2010-04-16 02:11:48 +04:00
lbz r12 , S V C P U _ S L B _ M A X ( r3 )
2009-11-02 15:02:29 +03:00
mulli r12 , r12 , 1 6
2010-04-16 02:11:48 +04:00
addi r12 , r12 , S V C P U _ S L B
add r12 , r12 , r3
2009-11-02 15:02:29 +03:00
/* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */
2010-04-16 02:11:48 +04:00
li r11 , S V C P U _ S L B
add r11 , r11 , r3
2009-11-02 15:02:29 +03:00
slb_loop_enter :
ld r10 , 0 ( r11 )
rldicl. r0 , r10 , 3 7 , 6 3
beq s l b _ l o o p _ e n t e r _ s k i p
ld r9 , 8 ( r11 )
slbmte r9 , r10
slb_loop_enter_skip :
addi r11 , r11 , 1 6
cmpd c r0 , r11 , r12
blt s l b _ l o o p _ e n t e r
slb_do_enter :
2010-04-16 02:11:48 +04:00
.endm
2009-11-02 15:02:29 +03:00
/ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* Exit c o d e *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * /
2010-04-16 02:11:48 +04:00
.macro LOAD_HOST_SEGMENTS
2009-11-02 15:02:29 +03:00
/ * Register u s a g e a t t h i s p o i n t :
*
2010-04-16 02:11:48 +04:00
* R1 = h o s t R 1
* R2 = h o s t R 2
* R1 2 = e x i t h a n d l e r i d
* R1 3 = s h a d o w v c p u - S H A D O W _ V C P U _ O F F [ =PACA o n P P C 6 4 ]
* SVCPU. * = g u e s t *
* SVCPU[ C R ] = g u e s t C R
* SVCPU[ X E R ] = g u e s t X E R
* SVCPU[ C T R ] = g u e s t C T R
* SVCPU[ L R ] = g u e s t L R
2009-11-02 15:02:29 +03:00
*
* /
/* Restore bolted entries from the shadow and fix it along the way */
/* We don't store anything in entry 0, so we don't need to take care of it */
slbia
isync
# if S L B _ N U M _ B O L T E D = = 3
ld r11 , P A C A _ S L B S H A D O W P T R ( r13 )
REBOLT_ S L B _ E N T R Y ( 0 )
REBOLT_ S L B _ E N T R Y ( 1 )
REBOLT_ S L B _ E N T R Y ( 2 )
# else
# error u n k n o w n n u m b e r o f b o l t e d e n t r i e s
# endif
slb_do_exit :
2010-04-16 02:11:48 +04:00
.endm
