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KVM: ppc: Refactor powerpc.c to relocate 440-specific code
This introduces a set of core-provided hooks. For 440, some of these are implemented by booke.c, with the rest in (the new) 44x.c. Note that these hooks are link-time, not run-time. Since it is not possible to build a single kernel for both e500 and 440 (for example), using function pointers would only add overhead. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
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Hollis Blanchard
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Avi Kivity
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Dec 31, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /* | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License, version 2, as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program; if not, write to the Free Software | ||
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| * | ||
| * Copyright IBM Corp. 2008 | ||
| * | ||
| * Authors: Hollis Blanchard <hollisb@us.ibm.com> | ||
| */ | ||
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| #include <linux/kvm_host.h> | ||
| #include <asm/reg.h> | ||
| #include <asm/cputable.h> | ||
| #include <asm/tlbflush.h> | ||
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| #include "44x_tlb.h" | ||
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| /* Note: clearing MSR[DE] just means that the debug interrupt will not be | ||
| * delivered *immediately*. Instead, it simply sets the appropriate DBSR bits. | ||
| * If those DBSR bits are still set when MSR[DE] is re-enabled, the interrupt | ||
| * will be delivered as an "imprecise debug event" (which is indicated by | ||
| * DBSR[IDE]. | ||
| */ | ||
| static void kvm44x_disable_debug_interrupts(void) | ||
| { | ||
| mtmsr(mfmsr() & ~MSR_DE); | ||
| } | ||
|
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| void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu) | ||
| { | ||
| kvm44x_disable_debug_interrupts(); | ||
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| mtspr(SPRN_IAC1, vcpu->arch.host_iac[0]); | ||
| mtspr(SPRN_IAC2, vcpu->arch.host_iac[1]); | ||
| mtspr(SPRN_IAC3, vcpu->arch.host_iac[2]); | ||
| mtspr(SPRN_IAC4, vcpu->arch.host_iac[3]); | ||
| mtspr(SPRN_DBCR1, vcpu->arch.host_dbcr1); | ||
| mtspr(SPRN_DBCR2, vcpu->arch.host_dbcr2); | ||
| mtspr(SPRN_DBCR0, vcpu->arch.host_dbcr0); | ||
| mtmsr(vcpu->arch.host_msr); | ||
| } | ||
|
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| void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu) | ||
| { | ||
| struct kvm_guest_debug *dbg = &vcpu->guest_debug; | ||
| u32 dbcr0 = 0; | ||
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| vcpu->arch.host_msr = mfmsr(); | ||
| kvm44x_disable_debug_interrupts(); | ||
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| /* Save host debug register state. */ | ||
| vcpu->arch.host_iac[0] = mfspr(SPRN_IAC1); | ||
| vcpu->arch.host_iac[1] = mfspr(SPRN_IAC2); | ||
| vcpu->arch.host_iac[2] = mfspr(SPRN_IAC3); | ||
| vcpu->arch.host_iac[3] = mfspr(SPRN_IAC4); | ||
| vcpu->arch.host_dbcr0 = mfspr(SPRN_DBCR0); | ||
| vcpu->arch.host_dbcr1 = mfspr(SPRN_DBCR1); | ||
| vcpu->arch.host_dbcr2 = mfspr(SPRN_DBCR2); | ||
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| /* set registers up for guest */ | ||
|
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| if (dbg->bp[0]) { | ||
| mtspr(SPRN_IAC1, dbg->bp[0]); | ||
| dbcr0 |= DBCR0_IAC1 | DBCR0_IDM; | ||
| } | ||
| if (dbg->bp[1]) { | ||
| mtspr(SPRN_IAC2, dbg->bp[1]); | ||
| dbcr0 |= DBCR0_IAC2 | DBCR0_IDM; | ||
| } | ||
| if (dbg->bp[2]) { | ||
| mtspr(SPRN_IAC3, dbg->bp[2]); | ||
| dbcr0 |= DBCR0_IAC3 | DBCR0_IDM; | ||
| } | ||
| if (dbg->bp[3]) { | ||
| mtspr(SPRN_IAC4, dbg->bp[3]); | ||
| dbcr0 |= DBCR0_IAC4 | DBCR0_IDM; | ||
| } | ||
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| mtspr(SPRN_DBCR0, dbcr0); | ||
| mtspr(SPRN_DBCR1, 0); | ||
| mtspr(SPRN_DBCR2, 0); | ||
| } | ||
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| void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | ||
| { | ||
| int i; | ||
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| /* Mark every guest entry in the shadow TLB entry modified, so that they | ||
| * will all be reloaded on the next vcpu run (instead of being | ||
| * demand-faulted). */ | ||
| for (i = 0; i <= tlb_44x_hwater; i++) | ||
| kvmppc_tlbe_set_modified(vcpu, i); | ||
| } | ||
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| void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu) | ||
| { | ||
| /* Don't leave guest TLB entries resident when being de-scheduled. */ | ||
| /* XXX It would be nice to differentiate between heavyweight exit and | ||
| * sched_out here, since we could avoid the TLB flush for heavyweight | ||
| * exits. */ | ||
| _tlbia(); | ||
| } | ||
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| int kvmppc_core_check_processor_compat(void) | ||
| { | ||
| int r; | ||
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| if (strcmp(cur_cpu_spec->platform, "ppc440") == 0) | ||
| r = 0; | ||
| else | ||
| r = -ENOTSUPP; | ||
|
|
||
| return r; | ||
| } |
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