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authorPaul Mackerras <paulus@samba.org>2011-06-29 04:40:08 +0400
committerAvi Kivity <avi@redhat.com>2011-07-12 14:16:59 +0400
commit9e368f2915601cd5bc7f5fd638b58435b018bbd7 (patch)
tree104aa8204f17d2d43e4746f614510e256896cb7e /arch/powerpc/kvm/book3s_hv_interrupts.S
parent969391c58a4efb8411d6881179945f425ad9cbb5 (diff)
downloadlinux-9e368f2915601cd5bc7f5fd638b58435b018bbd7.tar.xz
KVM: PPC: book3s_hv: Add support for PPC970-family processors
This adds support for running KVM guests in supervisor mode on those PPC970 processors that have a usable hypervisor mode. Unfortunately, Apple G5 machines have supervisor mode disabled (MSR[HV] is forced to 1), but the YDL PowerStation does have a usable hypervisor mode. There are several differences between the PPC970 and POWER7 in how guests are managed. These differences are accommodated using the CPU_FTR_ARCH_201 (PPC970) and CPU_FTR_ARCH_206 (POWER7) CPU feature bits. Notably, on PPC970: * The LPCR, LPID or RMOR registers don't exist, and the functions of those registers are provided by bits in HID4 and one bit in HID0. * External interrupts can be directed to the hypervisor, but unlike POWER7 they are masked by MSR[EE] in non-hypervisor modes and use SRR0/1 not HSRR0/1. * There is no virtual RMA (VRMA) mode; the guest must use an RMO (real mode offset) area. * The TLB entries are not tagged with the LPID, so it is necessary to flush the whole TLB on partition switch. Furthermore, when switching partitions we have to ensure that no other CPU is executing the tlbie or tlbsync instructions in either the old or the new partition, otherwise undefined behaviour can occur. * The PMU has 8 counters (PMC registers) rather than 6. * The DSCR, PURR, SPURR, AMR, AMOR, UAMOR registers don't exist. * The SLB has 64 entries rather than 32. * There is no mediated external interrupt facility, so if we switch to a guest that has a virtual external interrupt pending but the guest has MSR[EE] = 0, we have to arrange to have an interrupt pending for it so that we can get control back once it re-enables interrupts. We do that by sending ourselves an IPI with smp_send_reschedule after hard-disabling interrupts. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_interrupts.S')
-rw-r--r--arch/powerpc/kvm/book3s_hv_interrupts.S30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S
index 532afaf19841..3f7b674dd4bf 100644
--- a/arch/powerpc/kvm/book3s_hv_interrupts.S
+++ b/arch/powerpc/kvm/book3s_hv_interrupts.S
@@ -50,8 +50,10 @@ _GLOBAL(__kvmppc_vcore_entry)
SAVE_NVGPRS(r1)
/* Save host DSCR */
+BEGIN_FTR_SECTION
mfspr r3, SPRN_DSCR
std r3, HSTATE_DSCR(r13)
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_206)
/* Save host DABR */
mfspr r3, SPRN_DABR
@@ -86,12 +88,20 @@ _GLOBAL(__kvmppc_vcore_entry)
mfspr r7, SPRN_PMC4
mfspr r8, SPRN_PMC5
mfspr r9, SPRN_PMC6
+BEGIN_FTR_SECTION
+ mfspr r10, SPRN_PMC7
+ mfspr r11, SPRN_PMC8
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
stw r3, HSTATE_PMC(r13)
stw r5, HSTATE_PMC + 4(r13)
stw r6, HSTATE_PMC + 8(r13)
stw r7, HSTATE_PMC + 12(r13)
stw r8, HSTATE_PMC + 16(r13)
stw r9, HSTATE_PMC + 20(r13)
+BEGIN_FTR_SECTION
+ stw r10, HSTATE_PMC + 24(r13)
+ stw r11, HSTATE_PMC + 28(r13)
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
31:
/*
@@ -105,6 +115,26 @@ _GLOBAL(__kvmppc_vcore_entry)
add r8,r8,r7
std r8,HSTATE_DECEXP(r13)
+ /*
+ * On PPC970, if the guest vcpu has an external interrupt pending,
+ * send ourselves an IPI so as to interrupt the guest once it
+ * enables interrupts. (It must have interrupts disabled,
+ * otherwise we would already have delivered the interrupt.)
+ */
+BEGIN_FTR_SECTION
+ ld r0, VCPU_PENDING_EXC(r4)
+ li r7, (1 << BOOK3S_IRQPRIO_EXTERNAL)
+ oris r7, r7, (1 << BOOK3S_IRQPRIO_EXTERNAL_LEVEL)@h
+ and. r0, r0, r7
+ beq 32f
+ mr r31, r4
+ lhz r3, PACAPACAINDEX(r13)
+ bl smp_send_reschedule
+ nop
+ mr r4, r31
+32:
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_201)
+
/* Jump to partition switch code */
bl .kvmppc_hv_entry_trampoline
nop