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, and r9 free. 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@xxxxxxxxx> --- arch/powerpc/include/asm/exception-64s.h | 28 +++++++++++++++------------- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 15 +++++++-------- arch/powerpc/kvm/book3s_segment.S | 27 ++++++++++++++++++++------- 3 files changed, 42 insertions(+), 28 deletions(-) diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h index 9a3eee6..bc8fc45 100644 --- a/arch/powerpc/include/asm/exception-64s.h +++ b/arch/powerpc/include/asm/exception-64s.h @@ -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 +243,32 @@ 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; \ + li r12,(n); \ + sldi r12,r12,32; \ + or r12,r12,r9; \ + ld r9,area+EX_R9(r13); \ + std r9,HSTATE_SCRATCH1(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; \ + li r12,(n); \ + sldi r12,r12,32; \ + or r12,r12,r9; \ + ld r9,area+EX_R9(r13); \ + std r9,HSTATE_SCRATCH1(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 diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index c3c1d1b..0536c73 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -1043,19 +1043,18 @@ hdec_soon: kvmppc_interrupt_hv: /* * Register contents: - * R12 = interrupt vector + * R12 = (interrupt vector << 32) | guest CR * R13 = PACA - * guest CR, R12 saved in shadow VCPU SCRATCH1/0 + * R9 = unused + * guest R12, R9 saved in shadow VCPU SCRATCH0/1 respectively * guest R13 saved in SPRN_SCRATCH0 */ - std r9, HSTATE_SCRATCH2(r13) - lbz r9, HSTATE_IN_GUEST(r13) cmpwi r9, KVM_GUEST_MODE_HOST_HV beq kvmppc_bad_host_intr #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE cmpwi r9, KVM_GUEST_MODE_GUEST - ld r9, HSTATE_SCRATCH2(r13) + ld r9, HSTATE_SCRATCH1(r13) beq kvmppc_interrupt_pr #endif /* We're now back in the host but in guest MMU context */ @@ -1075,14 +1074,13 @@ kvmppc_interrupt_hv: std r6, VCPU_GPR(R6)(r9) std r7, VCPU_GPR(R7)(r9) std r8, VCPU_GPR(R8)(r9) - ld r0, HSTATE_SCRATCH2(r13) + ld r0, HSTATE_SCRATCH1(r13) std r0, VCPU_GPR(R9)(r9) std r10, VCPU_GPR(R10)(r9) std r11, VCPU_GPR(R11)(r9) ld r3, HSTATE_SCRATCH0(r13) - lwz r4, HSTATE_SCRATCH1(r13) std r3, VCPU_GPR(R12)(r9) - stw r4, VCPU_CR(r9) + stw r12, VCPU_CR(r9) /* CR is in the low half of r12 */ BEGIN_FTR_SECTION ld r3, HSTATE_CFAR(r13) std r3, VCPU_CFAR(r9) @@ -1100,6 +1098,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) mfspr r11, SPRN_SRR1 std r10, VCPU_SRR0(r9) std r11, VCPU_SRR1(r9) + srdi r12, r12, 32 /* trap is in the high half of r12 */ andi. r0, r12, 2 /* need to read HSRR0/1? */ beq 1f mfspr r10, SPRN_HSRR0 diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S index ca8f174..3b29f0f 100644 --- a/arch/powerpc/kvm/book3s_segment.S +++ b/arch/powerpc/kvm/book3s_segment.S @@ -167,20 +167,33 @@ kvmppc_handler_trampoline_enter_end: * * *****************************************************************************/ -.global kvmppc_handler_trampoline_exit -kvmppc_handler_trampoline_exit: - .global kvmppc_interrupt_pr kvmppc_interrupt_pr: + /* 64-bit entry. Register usage at this point: + * + * SPRG_SCRATCH0 = guest R13 + * R9 = unused + * R12 = (exit handler id << 32) | guest CR + * R13 = PACA + * HSTATE.SCRATCH0 = guest R12 + * HSTATE.SCRATCH1 = guest R9 + */ +#ifdef CONFIG_PPC64 + /* Match 32-bit entry */ + ld r9,HSTATE_SCRATCH1(r13) + stw r12,HSTATE_SCRATCH1(r13) /* CR is in the low half of r12 */ + srdi r12, r12, 32 /* trap is in the high half of r12 */ +#endif +.global kvmppc_handler_trampoline_exit +kvmppc_handler_trampoline_exit: /* Register usage at this point: * - * SPRG_SCRATCH0 = guest R13 - * R12 = exit handler id - * R13 = shadow vcpu (32-bit) or PACA (64-bit) + * SPRG_SCRATCH0 = guest R13 + * R12 = exit handler id + * R13 = shadow vcpu (32-bit) or PACA (64-bit) * HSTATE.SCRATCH0 = guest R12 * HSTATE.SCRATCH1 = guest CR - * */ /* Save registers */ -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
