Add interrupt handling code

Getting from host state to the guest is only half the story. We also need
to return to our host context and handle whatever happened to get us out of
the guest.

On PowerPC every guest exit is an interrupt. So all we need to do is trap
the host's interrupt handlers and get into our #VMEXIT code to handle it.

PowerPCs also have a register that can add an offset to the interrupt handlers'
adresses which is what the booke KVM code uses. Unfortunately that is a
hypervisor ressource and we also want to be able to run KVM when we're running
in an LPAR. So we have to hook into the Linux interrupt handlers.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 131 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_64_rmhandlers.S b/arch/powerpc/kvm/book3s_64_rmhandlers.S
new file mode 100644
index 000000000000..fb7dd2e9ac88
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_rmhandlers.S
@@ -0,0 +1,131 @@
+/*
+ * 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 SUSE Linux Products GmbH 2009
+ *
+ * Authors: Alexander Graf <agraf@suse.de>
+ */
+
+#include <asm/ppc_asm.h>
+#include <asm/kvm_asm.h>
+#include <asm/reg.h>
+#include <asm/page.h>
+#include <asm/asm-offsets.h>
+#include <asm/exception-64s.h>
+
+/*****************************************************************************
+ *                                                                           *
+ *        Real Mode handlers that need to be in low physical memory          *
+ *                                                                           *
+ ****************************************************************************/
+
+
+.macro INTERRUPT_TRAMPOLINE intno
+
+.global kvmppc_trampoline_\intno
+kvmppc_trampoline_\intno:
+
+        mtspr   SPRN_SPRG_SCRATCH0, r13         /* Save r13 */
+
+        /*
+         * First thing to do is to find out if we're coming
+         * from a KVM guest or a Linux process.
+         *
+         * To distinguish, we check a magic byte in the PACA
+         */
+        mfspr   r13, SPRN_SPRG_PACA             /* r13 = PACA */
+        std     r12, (PACA_EXMC + EX_R12)(r13)
+        mfcr    r12
+        stw     r12, (PACA_EXMC + EX_CCR)(r13)
+        lbz     r12, PACA_KVM_IN_GUEST(r13)
+        cmpwi   r12, 0
+        bne     ..kvmppc_handler_hasmagic_\intno
+        /* No KVM guest? Then jump back to the Linux handler! */
+        lwz     r12, (PACA_EXMC + EX_CCR)(r13)
+        mtcr    r12
+        ld      r12, (PACA_EXMC + EX_R12)(r13)
+        mfspr   r13, SPRN_SPRG_SCRATCH0         /* r13 = original r13 */
+        b       kvmppc_resume_\intno            /* Get back original handler */
+
+        /* Now we know we're handling a KVM guest */
+..kvmppc_handler_hasmagic_\intno:
+        /* Unset guest state */
+        li      r12, 0
+        stb     r12, PACA_KVM_IN_GUEST(r13)
+
+        std     r1, (PACA_EXMC+EX_R9)(r13)
+        std     r10, (PACA_EXMC+EX_R10)(r13)
+        std     r11, (PACA_EXMC+EX_R11)(r13)
+        std     r2, (PACA_EXMC+EX_R13)(r13)
+
+        mfsrr0  r10
+        mfsrr1  r11
+
+        /* Restore R1/R2 so we can handle faults */
+        ld      r1, PACAR1(r13)
+        ld      r2, (PACA_EXMC+EX_SRR0)(r13)
+
+        /* Let's store which interrupt we're handling */
+        li      r12, \intno
+
+        /* Jump into the SLB exit code that goes to the highmem handler */
+        b       kvmppc_handler_trampoline_exit
+
+.endm
+
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_SYSTEM_RESET
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_MACHINE_CHECK
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_DATA_STORAGE
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_DATA_SEGMENT
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_INST_STORAGE
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_INST_SEGMENT
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_EXTERNAL
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_ALIGNMENT
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_PROGRAM
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_FP_UNAVAIL
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_DECREMENTER
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_SYSCALL
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_TRACE
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_PERFMON
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_ALTIVEC
+INTERRUPT_TRAMPOLINE    BOOK3S_INTERRUPT_VSX
+
+/*
+ * This trampoline brings us back to a real mode handler
+ *
+ * Input Registers:
+ *
+ * R6 = SRR0
+ * R7 = SRR1
+ * LR = real-mode IP
+ *
+ */
+.global kvmppc_handler_lowmem_trampoline
+kvmppc_handler_lowmem_trampoline:
+
+        mtsrr0  r6
+        mtsrr1  r7
+        blr
+kvmppc_handler_lowmem_trampoline_end:
+
+.global kvmppc_trampoline_lowmem
+kvmppc_trampoline_lowmem:
+        .long kvmppc_handler_lowmem_trampoline - _stext
+
+.global kvmppc_trampoline_enter
+kvmppc_trampoline_enter:
+        .long kvmppc_handler_trampoline_enter - _stext
+
+#include "book3s_64_slb.S"
+