KVM: PPC: Add support for Book3S processors in hypervisor mode

This adds support for KVM running on 64-bit Book 3S processors,
specifically POWER7, in hypervisor mode.  Using hypervisor mode means
that the guest can use the processor's supervisor mode.  That means
that the guest can execute privileged instructions and access privileged
registers itself without trapping to the host.  This gives excellent
performance, but does mean that KVM cannot emulate a processor
architecture other than the one that the hardware implements.

This code assumes that the guest is running paravirtualized using the
PAPR (Power Architecture Platform Requirements) interface, which is the
interface that IBM's PowerVM hypervisor uses.  That means that existing
Linux distributions that run on IBM pSeries machines will also run
under KVM without modification.  In order to communicate the PAPR
hypercalls to qemu, this adds a new KVM_EXIT_PAPR_HCALL exit code
to include/linux/kvm.h.

Currently the choice between book3s_hv support and book3s_pr support
(i.e. the existing code, which runs the guest in user mode) has to be
made at kernel configuration time, so a given kernel binary can only
do one or the other.

This new book3s_hv code doesn't support MMIO emulation at present.
Since we are running paravirtualized guests, this isn't a serious
restriction.

With the guest running in supervisor mode, most exceptions go straight
to the guest.  We will never get data or instruction storage or segment
interrupts, alignment interrupts, decrementer interrupts, program
interrupts, single-step interrupts, etc., coming to the hypervisor from
the guest.  Therefore this introduces a new KVMTEST_NONHV macro for the
exception entry path so that we don't have to do the KVM test on entry
to those exception handlers.

We do however get hypervisor decrementer, hypervisor data storage,
hypervisor instruction storage, and hypervisor emulation assist
interrupts, so we have to handle those.

In hypervisor mode, real-mode accesses can access all of RAM, not just
a limited amount.  Therefore we put all the guest state in the vcpu.arch
and use the shadow_vcpu in the PACA only for temporary scratch space.
We allocate the vcpu with kzalloc rather than vzalloc, and we don't use
anything in the kvmppc_vcpu_book3s struct, so we don't allocate it.
We don't have a shared page with the guest, but we still need a
kvm_vcpu_arch_shared struct to store the values of various registers,
so we include one in the vcpu_arch struct.

The POWER7 processor has a restriction that all threads in a core have
to be in the same partition.  MMU-on kernel code counts as a partition
(partition 0), so we have to do a partition switch on every entry to and
exit from the guest.  At present we require the host and guest to run
in single-thread mode because of this hardware restriction.

This code allocates a hashed page table for the guest and initializes
it with HPTEs for the guest's Virtual Real Memory Area (VRMA).  We
require that the guest memory is allocated using 16MB huge pages, in
order to simplify the low-level memory management.  This also means that
we can get away without tracking paging activity in the host for now,
since huge pages can't be paged or swapped.

This also adds a few new exports needed by the book3s_hv code.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 32 insertions, 28 deletions

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 6da00550afea..163c041cec24 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -87,14 +87,14 @@ data_access_not_stab:
 END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
 #endif
 	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
-				 KVMTEST, 0x300)
+				 KVMTEST_PR, 0x300)
 
 	. = 0x380
 	.globl data_access_slb_pSeries
 data_access_slb_pSeries:
 	HMT_MEDIUM
 	SET_SCRATCH0(r13)
-	EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
+	EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x380)
 	std	r3,PACA_EXSLB+EX_R3(r13)
 	mfspr	r3,SPRN_DAR
 #ifdef __DISABLED__
@@ -125,7 +125,7 @@ data_access_slb_pSeries:
 instruction_access_slb_pSeries:
 	HMT_MEDIUM
 	SET_SCRATCH0(r13)
-	EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480)
+	EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
 	std	r3,PACA_EXSLB+EX_R3(r13)
 	mfspr	r3,SPRN_SRR0		/* SRR0 is faulting address */
 #ifdef __DISABLED__
@@ -153,32 +153,32 @@ instruction_access_slb_pSeries:
 hardware_interrupt_pSeries:
 hardware_interrupt_hv:
 	BEGIN_FTR_SECTION
-		_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
-					    EXC_STD, SOFTEN_TEST)
-		KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
-	FTR_SECTION_ELSE
 		_MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
 					    EXC_HV, SOFTEN_TEST_HV)
 		KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
-	ALT_FTR_SECTION_END_IFCLR(CPU_FTR_HVMODE_206)
+	FTR_SECTION_ELSE
+		_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
+					    EXC_STD, SOFTEN_TEST_PR)
+		KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
+	ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE_206)
 
 	STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x600)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
 
 	STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x700)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
 
 	STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x800)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
 
 	MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
 	MASKABLE_EXCEPTION_HV(0x980, 0x982, decrementer)
 
 	STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xa00)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
 
 	STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xb00)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
 
 	. = 0xc00
 	.globl	system_call_pSeries
@@ -219,7 +219,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
 	b	.
 
 	STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xd00)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
 
 	/* At 0xe??? we have a bunch of hypervisor exceptions, we branch
 	 * out of line to handle them
@@ -254,23 +254,23 @@ vsx_unavailable_pSeries_1:
 
 #ifdef CONFIG_CBE_RAS
 	STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
-	KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
+	KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
 #endif /* CONFIG_CBE_RAS */
 
 	STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
-	KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
+	KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
 
 #ifdef CONFIG_CBE_RAS
 	STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
-	KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
+	KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
 #endif /* CONFIG_CBE_RAS */
 
 	STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x1700)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
 
 #ifdef CONFIG_CBE_RAS
 	STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
-	KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
+	KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
 #endif /* CONFIG_CBE_RAS */
 
 	. = 0x3000
@@ -297,7 +297,7 @@ data_access_check_stab:
 	mfspr	r9,SPRN_DSISR
 	srdi	r10,r10,60
 	rlwimi	r10,r9,16,0x20
-#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
+#ifdef CONFIG_KVM_BOOK3S_PR
 	lbz	r9,HSTATE_IN_GUEST(r13)
 	rlwimi	r10,r9,8,0x300
 #endif
@@ -316,11 +316,11 @@ do_stab_bolted_pSeries:
 	EXCEPTION_PROLOG_PSERIES_1(.do_stab_bolted, EXC_STD)
 #endif /* CONFIG_POWER4_ONLY */
 
-	KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
-	KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x400)
-	KVM_HANDLER(PACA_EXSLB, EXC_STD, 0x480)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x900)
+	KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x300)
+	KVM_HANDLER_PR_SKIP(PACA_EXSLB, EXC_STD, 0x380)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x400)
+	KVM_HANDLER_PR(PACA_EXSLB, EXC_STD, 0x480)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x900)
 	KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
 
 	.align	7
@@ -336,11 +336,11 @@ do_stab_bolted_pSeries:
 
 	/* moved from 0xf00 */
 	STD_EXCEPTION_PSERIES(., 0xf00, performance_monitor)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf00)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf00)
 	STD_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20)
 	STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable)
-	KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf40)
+	KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40)
 
 /*
  * An interrupt came in while soft-disabled; clear EE in SRR1,
@@ -417,7 +417,11 @@ slb_miss_user_pseries:
 /* KVM's trampoline code needs to be close to the interrupt handlers */
 
 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
+#ifdef CONFIG_KVM_BOOK3S_PR
 #include "../kvm/book3s_rmhandlers.S"
+#else
+#include "../kvm/book3s_hv_rmhandlers.S"
+#endif
 #endif
 
 	.align	7