KVM: PPC: Book3S: Move 64-bit KVM interrupt handler out from alt section

A subsequent patch to make KVM handlers relocation-safe makes them
unusable from within alt section "else" cases (due to the way fixed
addresses are taken from within fixed section head code).

Stop open-coding the KVM handlers, and add them both as normal. A more
optimal fix may be to allow some level of alternate feature patching in
the exception macros themselves, but for now this will do.

The TRAMP_KVM handlers must be moved to the "virt" fixed section area
(name is arbitrary) in order to be closer to .text and avoid the dreaded
"relocation truncated to fit" error.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/head-64.h b/arch/powerpc/include/asm/head-64.h
index fca7033..9bd8161 100644 (file)
--- a/arch/powerpc/include/asm/head-64.h
+++ b/arch/powerpc/include/asm/head-64.h
@@ -218,7 +218,7 @@ name:
 
 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
 #define TRAMP_KVM_BEGIN(name)                                          \
-       TRAMP_REAL_BEGIN(name)
+       TRAMP_VIRT_BEGIN(name)
 #else
 #define TRAMP_KVM_BEGIN(name)
 #endif

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index d39d611..89b4f12 100644 (file)
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -717,13 +717,9 @@ hardware_interrupt_hv:
        BEGIN_FTR_SECTION
                _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
                                            EXC_HV, SOFTEN_TEST_HV)
-do_kvm_H0x500:
-               KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
        FTR_SECTION_ELSE
                _MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt_common,
                                            EXC_STD, SOFTEN_TEST_PR)
-do_kvm_0x500:
-               KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
        ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
 EXC_REAL_END(hardware_interrupt, 0x500, 0x600)
 
@@ -737,6 +733,8 @@ hardware_interrupt_relon_hv:
        ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
 EXC_VIRT_END(hardware_interrupt, 0x4500, 0x4600)
 
+TRAMP_KVM(PACA_EXGEN, 0x500)
+TRAMP_KVM_HV(PACA_EXGEN, 0x500)
 EXC_COMMON_ASYNC(hardware_interrupt_common, 0x500, do_IRQ)