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>
diff --git a/arch/powerpc/kvm/44x.c b/arch/powerpc/kvm/44x.c
new file mode 100644
index 0000000..fcf8c7d
--- /dev/null
+++ b/arch/powerpc/kvm/44x.c
@@ -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>
+ */
+
+#include <linux/kvm_host.h>
+#include <asm/reg.h>
+#include <asm/cputable.h>
+#include <asm/tlbflush.h>
+
+#include "44x_tlb.h"
+
+/* 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);
+}
+
+void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
+{
+ kvm44x_disable_debug_interrupts();
+
+ 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);
+}
+
+void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
+{
+ struct kvm_guest_debug *dbg = &vcpu->guest_debug;
+ u32 dbcr0 = 0;
+
+ vcpu->arch.host_msr = mfmsr();
+ kvm44x_disable_debug_interrupts();
+
+ /* 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);
+
+ /* set registers up for guest */
+
+ 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;
+ }
+
+ mtspr(SPRN_DBCR0, dbcr0);
+ mtspr(SPRN_DBCR1, 0);
+ mtspr(SPRN_DBCR2, 0);
+}
+
+void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ int i;
+
+ /* 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);
+}
+
+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();
+}
+
+int kvmppc_core_check_processor_compat(void)
+{
+ int r;
+
+ if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
+ r = 0;
+ else
+ r = -ENOTSUPP;
+
+ return r;
+}