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KVM: PPC: Book3S: Change interrupt call to reduce scratch space use on HV

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Change the calling convention to put the trap number together with
CR in two halves of r12, which frees up HSTATE_SCRATCH2 in the HV
handler.

The 64-bit PR handler entry translates the calling convention back
to match the previous call convention (i.e., shared with 32-bit), for
simplicity.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2016-12-22 04:29:25 +10:00
committed by Michael Ellerman
parent 49def18533
commit d3918e7fd4
3 changed files with 38 additions and 27 deletions
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24
arch/powerpc/include/asm/exception-64s.h
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@@ -233,7 +233,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#endif
#define __KVM_HANDLER_PROLOG(area, n) \
#define __KVM_HANDLER(area, h, n) \
BEGIN_FTR_SECTION_NESTED(947) \
ld r10,area+EX_CFAR(r13); \
std r10,HSTATE_CFAR(r13); \
@@ -243,30 +243,28 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
std r10,HSTATE_PPR(r13); \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
ld r10,area+EX_R10(r13); \
stw r9,HSTATE_SCRATCH1(r13); \
ld r9,area+EX_R9(r13); \
std r12,HSTATE_SCRATCH0(r13); \
#define __KVM_HANDLER(area, h, n) \
__KVM_HANDLER_PROLOG(area, n) \
li r12,n; \
sldi r12,r9,32; \
ori r12,r12,(n); \
ld r9,area+EX_R9(r13); \
b kvmppc_interrupt
#define __KVM_HANDLER_SKIP(area, h, n) \
cmpwi r10,KVM_GUEST_MODE_SKIP; \
ld r10,area+EX_R10(r13); \
beq 89f; \
stw r9,HSTATE_SCRATCH1(r13); \
BEGIN_FTR_SECTION_NESTED(948) \
ld r9,area+EX_PPR(r13); \
std r9,HSTATE_PPR(r13); \
ld r10,area+EX_PPR(r13); \
std r10,HSTATE_PPR(r13); \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
ld r9,area+EX_R9(r13); \
ld r10,area+EX_R10(r13); \
std r12,HSTATE_SCRATCH0(r13); \
li r12,n; \
sldi r12,r9,32; \
ori r12,r12,(n); \
ld r9,area+EX_R9(r13); \
b kvmppc_interrupt; \
89: mtocrf 0x80,r9; \
ld r9,area+EX_R9(r13); \
ld r10,area+EX_R10(r13); \
b kvmppc_skip_##h##interrupt
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER