Commit 7041d281 authored by Martin Schwidefsky's avatar Martin Schwidefsky

s390: scrub registers on kernel entry and KVM exit

Clear all user space registers on entry to the kernel and all KVM guest
registers on KVM guest exit if the register does not contain either a
parameter or a result value.
Reviewed-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 364e3f90
...@@ -248,6 +248,12 @@ ENTRY(sie64a) ...@@ -248,6 +248,12 @@ ENTRY(sie64a)
sie_exit: sie_exit:
lg %r14,__SF_EMPTY+8(%r15) # load guest register save area lg %r14,__SF_EMPTY+8(%r15) # load guest register save area
stmg %r0,%r13,0(%r14) # save guest gprs 0-13 stmg %r0,%r13,0(%r14) # save guest gprs 0-13
xgr %r0,%r0 # clear guest registers to
xgr %r1,%r1 # prevent speculative use
xgr %r2,%r2
xgr %r3,%r3
xgr %r4,%r4
xgr %r5,%r5
lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
lg %r2,__SF_EMPTY+16(%r15) # return exit reason code lg %r2,__SF_EMPTY+16(%r15) # return exit reason code
br %r14 br %r14
...@@ -282,6 +288,8 @@ ENTRY(system_call) ...@@ -282,6 +288,8 @@ ENTRY(system_call)
.Lsysc_vtime: .Lsysc_vtime:
UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
stmg %r0,%r7,__PT_R0(%r11) stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled register to prevent speculative use
xgr %r0,%r0
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
...@@ -561,6 +569,15 @@ ENTRY(pgm_check_handler) ...@@ -561,6 +569,15 @@ ENTRY(pgm_check_handler)
4: lgr %r13,%r11 4: lgr %r13,%r11
la %r11,STACK_FRAME_OVERHEAD(%r15) la %r11,STACK_FRAME_OVERHEAD(%r15)
stmg %r0,%r7,__PT_R0(%r11) stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled registers to prevent speculative use
xgr %r0,%r0
xgr %r1,%r1
xgr %r2,%r2
xgr %r3,%r3
xgr %r4,%r4
xgr %r5,%r5
xgr %r6,%r6
xgr %r7,%r7
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
stmg %r8,%r9,__PT_PSW(%r11) stmg %r8,%r9,__PT_PSW(%r11)
mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC
...@@ -626,6 +643,16 @@ ENTRY(io_int_handler) ...@@ -626,6 +643,16 @@ ENTRY(io_int_handler)
lmg %r8,%r9,__LC_IO_OLD_PSW lmg %r8,%r9,__LC_IO_OLD_PSW
SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
stmg %r0,%r7,__PT_R0(%r11) stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled registers to prevent speculative use
xgr %r0,%r0
xgr %r1,%r1
xgr %r2,%r2
xgr %r3,%r3
xgr %r4,%r4
xgr %r5,%r5
xgr %r6,%r6
xgr %r7,%r7
xgr %r10,%r10
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
stmg %r8,%r9,__PT_PSW(%r11) stmg %r8,%r9,__PT_PSW(%r11)
mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID
...@@ -839,6 +866,16 @@ ENTRY(ext_int_handler) ...@@ -839,6 +866,16 @@ ENTRY(ext_int_handler)
lmg %r8,%r9,__LC_EXT_OLD_PSW lmg %r8,%r9,__LC_EXT_OLD_PSW
SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER
stmg %r0,%r7,__PT_R0(%r11) stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled registers to prevent speculative use
xgr %r0,%r0
xgr %r1,%r1
xgr %r2,%r2
xgr %r3,%r3
xgr %r4,%r4
xgr %r5,%r5
xgr %r6,%r6
xgr %r7,%r7
xgr %r10,%r10
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
stmg %r8,%r9,__PT_PSW(%r11) stmg %r8,%r9,__PT_PSW(%r11)
lghi %r1,__LC_EXT_PARAMS2 lghi %r1,__LC_EXT_PARAMS2
...@@ -1046,6 +1083,16 @@ ENTRY(mcck_int_handler) ...@@ -1046,6 +1083,16 @@ ENTRY(mcck_int_handler)
.Lmcck_skip: .Lmcck_skip:
lghi %r14,__LC_GPREGS_SAVE_AREA+64 lghi %r14,__LC_GPREGS_SAVE_AREA+64
stmg %r0,%r7,__PT_R0(%r11) stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled registers to prevent speculative use
xgr %r0,%r0
xgr %r1,%r1
xgr %r2,%r2
xgr %r3,%r3
xgr %r4,%r4
xgr %r5,%r5
xgr %r6,%r6
xgr %r7,%r7
xgr %r10,%r10
mvc __PT_R8(64,%r11),0(%r14) mvc __PT_R8(64,%r11),0(%r14)
stmg %r8,%r9,__PT_PSW(%r11) stmg %r8,%r9,__PT_PSW(%r11)
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
......
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