Re: [PATCH v3 13/41] KVM: PPC: Book3S 64: Move interrupt early register setup to KVM

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On 06/03/2021 02:06, Nicholas Piggin wrote:
Like the earlier patch for hcalls, KVM interrupt entry requires a
different calling convention than the Linux interrupt handlers
set up. Move the code that converts from one to the other into KVM.

Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
  arch/powerpc/kernel/exceptions-64s.S | 131 +++++----------------------
  arch/powerpc/kvm/book3s_64_entry.S   |  34 ++++++-
  2 files changed, 55 insertions(+), 110 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index b7092ba87da8..b4eab5084964 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -187,7 +187,6 @@ do_define_int n
  	.endif
  .endm
-#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  /*
   * All interrupts which set HSRR registers, as well as SRESET and MCE and
   * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken,
@@ -220,54 +219,25 @@ do_define_int n
   * to KVM to handle.
   */
-.macro KVMTEST name
+.macro KVMTEST name handler
+#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
  	lbz	r10,HSTATE_IN_GUEST(r13)
  	cmpwi	r10,0
-	bne	\name\()_kvm
-.endm
-
-.macro GEN_KVM name
-	.balign IFETCH_ALIGN_BYTES
-\name\()_kvm:
-
-BEGIN_FTR_SECTION
-	ld	r10,IAREA+EX_CFAR(r13)
-	std	r10,HSTATE_CFAR(r13)
-END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
-
-	ld	r10,IAREA+EX_CTR(r13)
-	mtctr	r10
-BEGIN_FTR_SECTION
-	ld	r10,IAREA+EX_PPR(r13)
-	std	r10,HSTATE_PPR(r13)
-END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
-	ld	r11,IAREA+EX_R11(r13)
-	ld	r12,IAREA+EX_R12(r13)
-	std	r12,HSTATE_SCRATCH0(r13)
-	sldi	r12,r9,32
-	ld	r9,IAREA+EX_R9(r13)
-	ld	r10,IAREA+EX_R10(r13)
  	/* HSRR variants have the 0x2 bit added to their trap number */
  	.if IHSRR_IF_HVMODE
  	BEGIN_FTR_SECTION
-	ori	r12,r12,(IVEC + 0x2)
+	li	r10,(IVEC + 0x2)
  	FTR_SECTION_ELSE
-	ori	r12,r12,(IVEC)
+	li	r10,(IVEC)
  	ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
  	.elseif IHSRR
-	ori	r12,r12,(IVEC+ 0x2)
+	li	r10,(IVEC + 0x2)
  	.else
-	ori	r12,r12,(IVEC)
+	li	r10,(IVEC)
  	.endif
-	b	kvmppc_interrupt
-.endm
-
-#else
-.macro KVMTEST name
-.endm
-.macro GEN_KVM name
-.endm
+	bne	\handler
  #endif
+.endm
/*
   * This is the BOOK3S interrupt entry code macro.
@@ -409,7 +379,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
  DEFINE_FIXED_SYMBOL(\name\()_common_real)
  \name\()_common_real:
  	.if IKVM_REAL
-		KVMTEST \name
+		KVMTEST \name kvm_interrupt
  	.endif
ld r10,PACAKMSR(r13) /* get MSR value for kernel */
@@ -432,7 +402,7 @@ DEFINE_FIXED_SYMBOL(\name\()_common_real)
  DEFINE_FIXED_SYMBOL(\name\()_common_virt)
  \name\()_common_virt:
  	.if IKVM_VIRT
-		KVMTEST \name
+		KVMTEST \name kvm_interrupt
  1:
  	.endif
  	.endif /* IVIRT */
@@ -446,7 +416,7 @@ DEFINE_FIXED_SYMBOL(\name\()_common_virt)
  DEFINE_FIXED_SYMBOL(\name\()_common_real)
  \name\()_common_real:
  	.if IKVM_REAL
-		KVMTEST \name
+		KVMTEST \name kvm_interrupt
  	.endif
  .endm
@@ -967,8 +937,6 @@ EXC_COMMON_BEGIN(system_reset_common)
  	EXCEPTION_RESTORE_REGS
  	RFI_TO_USER_OR_KERNEL
- GEN_KVM system_reset
-
/**
   * Interrupt 0x200 - Machine Check Interrupt (MCE).
@@ -1132,7 +1100,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
  	/*
  	 * Check if we are coming from guest. If yes, then run the normal
  	 * exception handler which will take the
-	 * machine_check_kvm->kvmppc_interrupt branch to deliver the MC event
+	 * machine_check_kvm->kvm_interrupt branch to deliver the MC event
  	 * to guest.
  	 */
  	lbz	r11,HSTATE_IN_GUEST(r13)
@@ -1203,8 +1171,6 @@ EXC_COMMON_BEGIN(machine_check_common)
  	bl	machine_check_exception
  	b	interrupt_return
- GEN_KVM machine_check
-
#ifdef CONFIG_PPC_P7_NAP
  /*
@@ -1339,8 +1305,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
  	REST_NVGPRS(r1)
  	b	interrupt_return
- GEN_KVM data_access
-
/**
   * Interrupt 0x380 - Data Segment Interrupt (DSLB).
@@ -1390,8 +1354,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
  	bl	do_bad_slb_fault
  	b	interrupt_return
- GEN_KVM data_access_slb
-
/**
   * Interrupt 0x400 - Instruction Storage Interrupt (ISI).
@@ -1428,8 +1390,6 @@ MMU_FTR_SECTION_ELSE
  ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
  	b	interrupt_return
- GEN_KVM instruction_access
-
/**
   * Interrupt 0x480 - Instruction Segment Interrupt (ISLB).
@@ -1474,8 +1434,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
  	bl	do_bad_slb_fault
  	b	interrupt_return
- GEN_KVM instruction_access_slb
-
/**
   * Interrupt 0x500 - External Interrupt.
@@ -1521,8 +1479,6 @@ EXC_COMMON_BEGIN(hardware_interrupt_common)
  	bl	do_IRQ
  	b	interrupt_return
- GEN_KVM hardware_interrupt
-
/**
   * Interrupt 0x600 - Alignment Interrupt
@@ -1550,8 +1506,6 @@ EXC_COMMON_BEGIN(alignment_common)
  	REST_NVGPRS(r1) /* instruction emulation may change GPRs */
  	b	interrupt_return
- GEN_KVM alignment
-
/**
   * Interrupt 0x700 - Program Interrupt (program check).
@@ -1659,8 +1613,6 @@ EXC_COMMON_BEGIN(program_check_common)
  	REST_NVGPRS(r1) /* instruction emulation may change GPRs */
  	b	interrupt_return
- GEN_KVM program_check
-
/*
   * Interrupt 0x800 - Floating-Point Unavailable Interrupt.
@@ -1710,8 +1662,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM)
  	b	interrupt_return
  #endif
- GEN_KVM fp_unavailable
-
/**
   * Interrupt 0x900 - Decrementer Interrupt.
@@ -1751,8 +1701,6 @@ EXC_COMMON_BEGIN(decrementer_common)
  	bl	timer_interrupt
  	b	interrupt_return
- GEN_KVM decrementer
-
/**
   * Interrupt 0x980 - Hypervisor Decrementer Interrupt.
@@ -1798,8 +1746,6 @@ EXC_COMMON_BEGIN(hdecrementer_common)
  	ld	r13,PACA_EXGEN+EX_R13(r13)
  	HRFI_TO_KERNEL
- GEN_KVM hdecrementer
-
/**
   * Interrupt 0xa00 - Directed Privileged Doorbell Interrupt.
@@ -1840,8 +1786,6 @@ EXC_COMMON_BEGIN(doorbell_super_common)
  #endif
  	b	interrupt_return
- GEN_KVM doorbell_super
-
EXC_REAL_NONE(0xb00, 0x100)
  EXC_VIRT_NONE(0x4b00, 0x100)
@@ -1891,7 +1835,7 @@ INT_DEFINE_END(system_call)
  	GET_PACA(r13)
  	std	r10,PACA_EXGEN+EX_R10(r13)
  	INTERRUPT_TO_KERNEL
-	KVMTEST system_call /* uses r10, branch to system_call_kvm */
+	KVMTEST system_call kvm_hcall /* uses r10, branch to kvm_hcall */
  	mfctr	r9
  #else
  	mr	r9,r13
@@ -1947,7 +1891,7 @@ EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100)
  EXC_VIRT_END(system_call, 0x4c00, 0x100)
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
-TRAMP_REAL_BEGIN(system_call_kvm)
+TRAMP_REAL_BEGIN(kvm_hcall)
  	mfctr	r10
  	SET_SCRATCH0(r10) /* Save r13 in SCRATCH0 */
  #ifdef CONFIG_RELOCATABLE
@@ -1987,8 +1931,6 @@ EXC_COMMON_BEGIN(single_step_common)
  	bl	single_step_exception
  	b	interrupt_return
- GEN_KVM single_step
-
/**
   * Interrupt 0xe00 - Hypervisor Data Storage Interrupt (HDSI).
@@ -2027,8 +1969,6 @@ MMU_FTR_SECTION_ELSE
  ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX)
  	b       interrupt_return
- GEN_KVM h_data_storage
-
/**
   * Interrupt 0xe20 - Hypervisor Instruction Storage Interrupt (HISI).
@@ -2054,8 +1994,6 @@ EXC_COMMON_BEGIN(h_instr_storage_common)
  	bl	unknown_exception
  	b	interrupt_return
- GEN_KVM h_instr_storage
-
/**
   * Interrupt 0xe40 - Hypervisor Emulation Assistance Interrupt.
@@ -2080,8 +2018,6 @@ EXC_COMMON_BEGIN(emulation_assist_common)
  	REST_NVGPRS(r1) /* instruction emulation may change GPRs */
  	b	interrupt_return
- GEN_KVM emulation_assist
-
/**
   * Interrupt 0xe60 - Hypervisor Maintenance Interrupt (HMI).
@@ -2153,8 +2089,6 @@ EXC_COMMON_BEGIN(hmi_exception_early_common)
  	EXCEPTION_RESTORE_REGS hsrr=1
  	GEN_INT_ENTRY hmi_exception, virt=0
- GEN_KVM hmi_exception_early
-
  EXC_COMMON_BEGIN(hmi_exception_common)
  	GEN_COMMON hmi_exception
  	FINISH_NAP
@@ -2162,8 +2096,6 @@ EXC_COMMON_BEGIN(hmi_exception_common)
  	bl	handle_hmi_exception
  	b	interrupt_return
- GEN_KVM hmi_exception
-
/**
   * Interrupt 0xe80 - Directed Hypervisor Doorbell Interrupt.
@@ -2195,8 +2127,6 @@ EXC_COMMON_BEGIN(h_doorbell_common)
  #endif
  	b	interrupt_return
- GEN_KVM h_doorbell
-
/**
   * Interrupt 0xea0 - Hypervisor Virtualization Interrupt.
@@ -2224,8 +2154,6 @@ EXC_COMMON_BEGIN(h_virt_irq_common)
  	bl	do_IRQ
  	b	interrupt_return
- GEN_KVM h_virt_irq
-
EXC_REAL_NONE(0xec0, 0x20)
  EXC_VIRT_NONE(0x4ec0, 0x20)
@@ -2270,8 +2198,6 @@ EXC_COMMON_BEGIN(performance_monitor_common)
  	bl	performance_monitor_exception
  	b	interrupt_return
- GEN_KVM performance_monitor
-
/**
   * Interrupt 0xf20 - Vector Unavailable Interrupt.
@@ -2321,8 +2247,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
  	bl	altivec_unavailable_exception
  	b	interrupt_return
- GEN_KVM altivec_unavailable
-
/**
   * Interrupt 0xf40 - VSX Unavailable Interrupt.
@@ -2371,8 +2295,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
  	bl	vsx_unavailable_exception
  	b	interrupt_return
- GEN_KVM vsx_unavailable
-
/**
   * Interrupt 0xf60 - Facility Unavailable Interrupt.
@@ -2401,8 +2323,6 @@ EXC_COMMON_BEGIN(facility_unavailable_common)
  	REST_NVGPRS(r1) /* instruction emulation may change GPRs */
  	b	interrupt_return
- GEN_KVM facility_unavailable
-
/**
   * Interrupt 0xf60 - Hypervisor Facility Unavailable Interrupt.
@@ -2431,8 +2351,6 @@ EXC_COMMON_BEGIN(h_facility_unavailable_common)
  	REST_NVGPRS(r1) /* XXX Shouldn't be necessary in practice */
  	b	interrupt_return
- GEN_KVM h_facility_unavailable
-
EXC_REAL_NONE(0xfa0, 0x20)
  EXC_VIRT_NONE(0x4fa0, 0x20)
@@ -2462,8 +2380,6 @@ EXC_COMMON_BEGIN(cbe_system_error_common)
  	bl	cbe_system_error_exception
  	b	interrupt_return
- GEN_KVM cbe_system_error
-
  #else /* CONFIG_CBE_RAS */
  EXC_REAL_NONE(0x1200, 0x100)
  EXC_VIRT_NONE(0x5200, 0x100)
@@ -2489,8 +2405,6 @@ EXC_COMMON_BEGIN(instruction_breakpoint_common)
  	bl	instruction_breakpoint_exception
  	b	interrupt_return
- GEN_KVM instruction_breakpoint
-
EXC_REAL_NONE(0x1400, 0x100)
  EXC_VIRT_NONE(0x5400, 0x100)
@@ -2611,8 +2525,6 @@ EXC_COMMON_BEGIN(denorm_exception_common)
  	bl	unknown_exception
  	b	interrupt_return
- GEN_KVM denorm_exception
-
#ifdef CONFIG_CBE_RAS
  INT_DEFINE_BEGIN(cbe_maintenance)
@@ -2630,8 +2542,6 @@ EXC_COMMON_BEGIN(cbe_maintenance_common)
  	bl	cbe_maintenance_exception
  	b	interrupt_return
- GEN_KVM cbe_maintenance
-
  #else /* CONFIG_CBE_RAS */
  EXC_REAL_NONE(0x1600, 0x100)
  EXC_VIRT_NONE(0x5600, 0x100)
@@ -2662,8 +2572,6 @@ EXC_COMMON_BEGIN(altivec_assist_common)
  #endif
  	b	interrupt_return
- GEN_KVM altivec_assist
-
#ifdef CONFIG_CBE_RAS
  INT_DEFINE_BEGIN(cbe_thermal)
@@ -2681,8 +2589,6 @@ EXC_COMMON_BEGIN(cbe_thermal_common)
  	bl	cbe_thermal_exception
  	b	interrupt_return
- GEN_KVM cbe_thermal
-
  #else /* CONFIG_CBE_RAS */
  EXC_REAL_NONE(0x1800, 0x100)
  EXC_VIRT_NONE(0x5800, 0x100)
@@ -2935,6 +2841,15 @@ TRAMP_REAL_BEGIN(rfscv_flush_fallback)
USE_TEXT_SECTION() +#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
+kvm_interrupt:
+	/*
+	 * The conditional branch in KVMTEST can't reach all the way,
+	 * make a stub.
+	 */
+	b	kvmppc_interrupt
+#endif
+
  _GLOBAL(do_uaccess_flush)
  	UACCESS_FLUSH_FIXUP_SECTION
  	nop
diff --git a/arch/powerpc/kvm/book3s_64_entry.S b/arch/powerpc/kvm/book3s_64_entry.S
index a7b6edd18bc8..d06e81842368 100644
--- a/arch/powerpc/kvm/book3s_64_entry.S
+++ b/arch/powerpc/kvm/book3s_64_entry.S
@@ -31,15 +31,45 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
  	sldi	r12,r10,32
  	ori	r12,r12,0xc00
  	ld	r10,PACA_EXGEN+EX_R10(r13)
+	b	do_kvm_interrupt
.global kvmppc_interrupt
  .balign IFETCH_ALIGN_BYTES
  kvmppc_interrupt:
+	li	r11,PACA_EXGEN
+	cmpdi	r10,0x200
+	bgt+	1f
+	li	r11,PACA_EXMC
+	beq	1f
+	li	r11,PACA_EXNMI
+1:	add	r11,r11,r13
+
+BEGIN_FTR_SECTION
+	ld	r12,EX_CFAR(r11)


r11 and r12 are not saved in EX_R11/12 as mentioned on slack unless I am missing something.


+	std	r12,HSTATE_CFAR(r13)
+END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
+	ld	r12,EX_CTR(r11)
+	mtctr	r12
+BEGIN_FTR_SECTION
+	ld	r12,EX_PPR(r11)
+	std	r12,HSTATE_PPR(r13)
+END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
+	ld	r12,EX_R12(r11)
+	std	r12,HSTATE_SCRATCH0(r13)
+	sldi	r12,r9,32
+	or	r12,r12,r10
+	ld	r9,EX_R9(r11)
+	ld	r10,EX_R10(r11)
+	ld	r11,EX_R11(r11)
+
+do_kvm_interrupt:
  	/*
-	 * Register contents:
+	 * Hcalls and other interrupts come here after normalising register
+	 * contents and save locations:
+	 *
  	 * R12		= (guest CR << 32) | interrupt vector
  	 * R13		= PACA
-	 * guest R12 saved in shadow VCPU SCRATCH0
+	 * guest R12 saved in shadow HSTATE_SCRATCH0
  	 * guest R13 saved in SPRN_SCRATCH0
  	 */
  	std	r9,HSTATE_SCRATCH2(r13)


--
Alexey



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