iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: In HV mode, use HSPRG0 for PACA

Browse Source 
When running in Hypervisor mode (arch 2.06 or later), we store the PACA
in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be
lost during a "nap" power management operation (though they aren't
currently on POWER7) and this enables use of SPRG1 by KVM guests.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
2011-01-20 17:50:21 +11:00
parent 24cc67de62
commit 2dd60d79e0
7 changed files with 50 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/powerpc/include/asm/exception-64s.h
View File

@ -56,8 +56,8 @@
#define LOAD_HANDLER(reg, label) \
addi reg,reg,(label)-_stext; /* virt addr of handler ... */
#define EXCEPTION_PROLOG_1(area) \
mfspr r13,SPRN_SPRG_PACA; /* get paca address into r13 */ \
#define EXCEPTION_PROLOG_1(area) \
GET_PACA(r13); \
std r9,area+EX_R9(r13); /* save r9 - r12 */ \
std r10,area+EX_R10(r13); \
std r11,area+EX_R11(r13); \
@ -174,7 +174,7 @@ label##_pSeries: \
HMT_MEDIUM; \
DO_KVM n; \
mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
mfspr r13,SPRN_SPRG_PACA; /* get paca address into r13 */ \
GET_PACA(r13); \
std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \
std r10,PACA_EXGEN+EX_R10(r13); \
lbz r10,PACASOFTIRQEN(r13); \