From 31a4d4480c616bf0fa475f1869e5df852d3544bd Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Thu, 19 Oct 2017 15:14:20 +1100 Subject: Revert "KVM: PPC: Book3S HV: POWER9 does not require secondary thread management" This reverts commit 94a04bc25a2c6296bd0c5e82c10e8231c2b11f77. In order to run HPT guests on a radix POWER9 host, we will have to run the host in single-threaded mode, because POWER9 processors do not currently support running some threads of a core in HPT mode while others are in radix mode ("mixed mode"). That means that we will need the same mechanisms that are used on POWER8 to make the secondary threads available to KVM, which were disabled on POWER9 by commit 94a04bc25a2c. Signed-off-by: Paul Mackerras Signed-off-by: Michael Ellerman --- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 -------- 1 file changed, 8 deletions(-) (limited to 'arch/powerpc/kvm/book3s_hv_rmhandlers.S') diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 17936f82d3c7..fb02209ff782 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -149,11 +149,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S) subf r4, r4, r3 mtspr SPRN_DEC, r4 -BEGIN_FTR_SECTION /* hwthread_req may have got set by cede or no vcpu, so clear it */ li r0, 0 stb r0, HSTATE_HWTHREAD_REQ(r13) -END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) /* * For external interrupts we need to call the Linux @@ -316,7 +314,6 @@ kvm_novcpu_exit: * Relocation is off and most register values are lost. * r13 points to the PACA. * r3 contains the SRR1 wakeup value, SRR1 is trashed. - * This is not used by ISAv3.0B processors. */ .globl kvm_start_guest kvm_start_guest: @@ -435,9 +432,6 @@ kvm_secondary_got_guest: * While waiting we also need to check if we get given a vcpu to run. */ kvm_no_guest: -BEGIN_FTR_SECTION - twi 31,0,0 -END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300) lbz r3, HSTATE_HWTHREAD_REQ(r13) cmpwi r3, 0 bne 53f @@ -2531,10 +2525,8 @@ kvm_do_nap: clrrdi r0, r0, 1 mtspr SPRN_CTRLT, r0 -BEGIN_FTR_SECTION li r0,1 stb r0,HSTATE_HWTHREAD_REQ(r13) -END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300) mfspr r5,SPRN_LPCR ori r5,r5,LPCR_PECE0 | LPCR_PECE1 BEGIN_FTR_SECTION -- cgit v1.2.3