@@ -752,14 +752,16 @@ END_FTR_SECTION_IFSET(CPU_FTR_PMAO_BUG)
BEGIN_FTR_SECTION
ld r5, VCPU_MMCR + 24(r4)
ld r6, VCPU_SIER(r4)
+ mtspr SPRN_MMCR2, r5
+ mtspr SPRN_SIER, r6
+BEGIN_FTR_SECTION_NESTED(96)
lwz r7, VCPU_PMC + 24(r4)
lwz r8, VCPU_PMC + 28(r4)
ld r9, VCPU_MMCR + 32(r4)
- mtspr SPRN_MMCR2, r5
- mtspr SPRN_SIER, r6
mtspr SPRN_SPMC1, r7
mtspr SPRN_SPMC2, r8
mtspr SPRN_MMCRS, r9
+END_FTR_SECTION_NESTED(CPU_FTR_ARCH_300, 0, 96)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
mtspr SPRN_MMCR0, r3
isync
@@ -815,20 +817,22 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
mtspr SPRN_EBBHR, r8
ld r5, VCPU_EBBRR(r4)
ld r6, VCPU_BESCR(r4)
- ld r7, VCPU_CSIGR(r4)
- ld r8, VCPU_TACR(r4)
+ lwz r7, VCPU_GUEST_PID(r4)
+ ld r8, VCPU_WORT(r4)
mtspr SPRN_EBBRR, r5
mtspr SPRN_BESCR, r6
- mtspr SPRN_CSIGR, r7
- mtspr SPRN_TACR, r8
+ mtspr SPRN_PID, r7
+ mtspr SPRN_WORT, r8
+BEGIN_FTR_SECTION
ld r5, VCPU_TCSCR(r4)
ld r6, VCPU_ACOP(r4)
- lwz r7, VCPU_GUEST_PID(r4)
- ld r8, VCPU_WORT(r4)
+ ld r7, VCPU_CSIGR(r4)
+ ld r8, VCPU_TACR(r4)
mtspr SPRN_TCSCR, r5
mtspr SPRN_ACOP, r6
- mtspr SPRN_PID, r7
- mtspr SPRN_WORT, r8
+ mtspr SPRN_CSIGR, r7
+ mtspr SPRN_TACR, r8
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
8:
/*
@@ -1343,20 +1347,22 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
std r8, VCPU_EBBHR(r9)
mfspr r5, SPRN_EBBRR
mfspr r6, SPRN_BESCR
- mfspr r7, SPRN_CSIGR
- mfspr r8, SPRN_TACR
+ mfspr r7, SPRN_PID
+ mfspr r8, SPRN_WORT
std r5, VCPU_EBBRR(r9)
std r6, VCPU_BESCR(r9)
- std r7, VCPU_CSIGR(r9)
- std r8, VCPU_TACR(r9)
+ stw r7, VCPU_GUEST_PID(r9)
+ std r8, VCPU_WORT(r9)
+BEGIN_FTR_SECTION
mfspr r5, SPRN_TCSCR
mfspr r6, SPRN_ACOP
- mfspr r7, SPRN_PID
- mfspr r8, SPRN_WORT
+ mfspr r7, SPRN_CSIGR
+ mfspr r8, SPRN_TACR
std r5, VCPU_TCSCR(r9)
std r6, VCPU_ACOP(r9)
- stw r7, VCPU_GUEST_PID(r9)
- std r8, VCPU_WORT(r9)
+ std r7, VCPU_CSIGR(r9)
+ std r8, VCPU_TACR(r9)
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
/*
* Restore various registers to 0, where non-zero values
* set by the guest could disrupt the host.
@@ -1365,12 +1371,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
mtspr SPRN_IAMR, r0
mtspr SPRN_CIABR, r0
mtspr SPRN_DAWRX, r0
- mtspr SPRN_TCSCR, r0
mtspr SPRN_WORT, r0
+BEGIN_FTR_SECTION
+ mtspr SPRN_TCSCR, r0
/* Set MMCRS to 1<<31 to freeze and disable the SPMC counters */
li r0, 1
sldi r0, r0, 31
mtspr SPRN_MMCRS, r0
+END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
8:
/* Save and reset AMR and UAMOR before turning on the MMU */
@@ -1504,15 +1512,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
stw r8, VCPU_PMC + 20(r9)
BEGIN_FTR_SECTION
mfspr r5, SPRN_SIER
+ std r5, VCPU_SIER(r9)
+BEGIN_FTR_SECTION_NESTED(96)
mfspr r6, SPRN_SPMC1
mfspr r7, SPRN_SPMC2
mfspr r8, SPRN_MMCRS
- std r5, VCPU_SIER(r9)
stw r6, VCPU_PMC + 24(r9)
stw r7, VCPU_PMC + 28(r9)
std r8, VCPU_MMCR + 32(r9)
lis r4, 0x8000
mtspr SPRN_MMCRS, r4
+END_FTR_SECTION_NESTED(CPU_FTR_ARCH_300, 0, 96)
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
22:
/* Clear out SLB */
Some special-purpose registers that were present and accessible by guests on POWER8 no longer exist on POWER9, so this adds feature sections to ensure that we don't try to context-switch them when going into or out of a guest on POWER9. These are all relatively obscure, rarely-used registers, but we had to context-switch them on POWER8 to avoid creating a covert channel. They are: SPMC1, SPMC2, MMCRS, CSIGR, TACR, TCSCR, and ACOP. Signed-off-by: Paul Mackerras <paulus@ozlabs.org> --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 50 ++++++++++++++++++++------------- 1 file changed, 30 insertions(+), 20 deletions(-)