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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>
This commit is contained in:
Hollis Blanchard 2008-11-05 09:36:14 -06:00 committed by Avi Kivity
parent d9fbd03d24
commit 9dd921cfea
9 changed files with 207 additions and 130 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/kvm_host.h
View File

@ -74,6 +74,9 @@ struct kvmppc_44x_tlbe {
struct kvm_arch {
};
/* XXX Can't include mmu-44x.h because it redefines struct mm_context. */
#define PPC44x_TLB_SIZE 64
struct kvm_vcpu_arch {
/* Unmodified copy of the guest's TLB. */
struct kvmppc_44x_tlbe guest_tlb[PPC44x_TLB_SIZE];

34
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -61,23 +61,6 @@ extern void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn,
extern void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode);
extern void kvmppc_mmu_switch_pid(struct kvm_vcpu *vcpu, u32 pid);
/* XXX Book E specific */
extern void kvmppc_tlbe_set_modified(struct kvm_vcpu *vcpu, unsigned int i);
extern void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu);
static inline void kvmppc_queue_exception(struct kvm_vcpu *vcpu, int exception)
{
unsigned int priority = exception_priority[exception];
set_bit(priority, &vcpu->arch.pending_exceptions);
}
static inline void kvmppc_clear_exception(struct kvm_vcpu *vcpu, int exception)
{
unsigned int priority = exception_priority[exception];
clear_bit(priority, &vcpu->arch.pending_exceptions);
}
/* Helper function for "full" MSR writes. No need to call this if only EE is
* changing. */
static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
@ -99,6 +82,23 @@ static inline void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 new_pid)
}
}
/* Core-specific hooks */
extern int kvmppc_core_check_processor_compat(void);
extern void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
extern void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu);
extern void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu);
extern void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu);
extern void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu);
extern int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu);
extern void kvmppc_core_queue_program(struct kvm_vcpu *vcpu);
extern void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu);
extern void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq);
extern void kvmppc_core_destroy_mmu(struct kvm_vcpu *vcpu);
#endif /* __POWERPC_KVM_PPC_H__ */

123
arch/powerpc/kvm/44x.c Normal file
View File

@ -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;
}

1
arch/powerpc/kvm/44x_tlb.h
View File

@ -29,6 +29,7 @@ extern struct kvmppc_44x_tlbe *kvmppc_44x_dtlb_search(struct kvm_vcpu *vcpu,
gva_t eaddr);
extern struct kvmppc_44x_tlbe *kvmppc_44x_itlb_search(struct kvm_vcpu *vcpu,
gva_t eaddr);
extern void kvmppc_tlbe_set_modified(struct kvm_vcpu *vcpu, unsigned int i);
/* TLB helper functions */
static inline unsigned int get_tlb_size(const struct kvmppc_44x_tlbe *tlbe)

11
arch/powerpc/kvm/Kconfig
View File

@ -16,11 +16,9 @@ if VIRTUALIZATION
config KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on 44x && EXPERIMENTAL
depends on EXPERIMENTAL
select PREEMPT_NOTIFIERS
select ANON_INODES
# We can only run on Book E hosts so far
select KVM_BOOKE
---help---
Support hosting virtualized guest machines. You will also
need to select one or more of the processor modules below.
@ -30,12 +28,11 @@ config KVM
If unsure, say N.
config KVM_BOOKE
bool "KVM support for Book E PowerPC processors"
config KVM_440
bool "KVM support for PowerPC 440 processors"
depends on KVM && 44x
---help---
Provides host support for KVM on Book E PowerPC processors. Currently
this works on 440 processors only.
KVM can run unmodified 440 guest kernels on 440 host processors.
config KVM_TRACE
bool "KVM trace support"

4
arch/powerpc/kvm/Makefile
View File

@ -13,5 +13,5 @@ obj-$(CONFIG_KVM) += kvm.o
AFLAGS_booke_interrupts.o := -I$(obj)
kvm-booke-objs := booke.o booke_interrupts.o 44x_tlb.o
obj-$(CONFIG_KVM_BOOKE) += kvm-booke.o
kvm-440-objs := booke.o booke_interrupts.o 44x.o 44x_tlb.o
obj-$(CONFIG_KVM_440) += kvm-440.o

61
arch/powerpc/kvm/booke.c
View File

@ -134,6 +134,40 @@ void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
}
}
static void kvmppc_booke_queue_exception(struct kvm_vcpu *vcpu, int exception)
{
unsigned int priority = exception_priority[exception];
set_bit(priority, &vcpu->arch.pending_exceptions);
}
static void kvmppc_booke_clear_exception(struct kvm_vcpu *vcpu, int exception)
{
unsigned int priority = exception_priority[exception];
clear_bit(priority, &vcpu->arch.pending_exceptions);
}
void kvmppc_core_queue_program(struct kvm_vcpu *vcpu)
{
kvmppc_booke_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
}
void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
{
kvmppc_booke_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
}
int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
{
unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
return test_bit(priority, &vcpu->arch.pending_exceptions);
}
void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq)
{
kvmppc_booke_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
}
/* Check if we are ready to deliver the interrupt */
static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
{
@ -168,7 +202,7 @@ static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
return r;
}
static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
static void kvmppc_booke_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
{
switch (interrupt) {
case BOOKE_INTERRUPT_DECREMENTER:
@ -183,7 +217,7 @@ static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
}
/* Check pending exceptions and deliver one, if possible. */
void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
{
unsigned long *pending = &vcpu->arch.pending_exceptions;
unsigned int exception;
@ -193,8 +227,8 @@ void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
while (priority <= BOOKE_MAX_INTERRUPT) {
exception = priority_exception[priority];
if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
kvmppc_clear_exception(vcpu, exception);
kvmppc_deliver_interrupt(vcpu, exception);
kvmppc_booke_clear_exception(vcpu, exception);
kvmppc_booke_deliver_interrupt(vcpu, exception);
break;
}
@ -251,7 +285,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
/* Program traps generated by user-level software must be handled
* by the guest kernel. */
vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
kvmppc_booke_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
r = RESUME_GUEST;
break;
}
@ -284,27 +318,27 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
break;
case BOOKE_INTERRUPT_FP_UNAVAIL:
kvmppc_queue_exception(vcpu, exit_nr);
kvmppc_booke_queue_exception(vcpu, exit_nr);
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_DATA_STORAGE:
vcpu->arch.dear = vcpu->arch.fault_dear;
vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_queue_exception(vcpu, exit_nr);
kvmppc_booke_queue_exception(vcpu, exit_nr);
vcpu->stat.dsi_exits++;
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_INST_STORAGE:
vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_queue_exception(vcpu, exit_nr);
kvmppc_booke_queue_exception(vcpu, exit_nr);
vcpu->stat.isi_exits++;
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_SYSCALL:
kvmppc_queue_exception(vcpu, exit_nr);
kvmppc_booke_queue_exception(vcpu, exit_nr);
vcpu->stat.syscall_exits++;
r = RESUME_GUEST;
break;
@ -318,7 +352,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
if (!gtlbe) {
/* The guest didn't have a mapping for it. */
kvmppc_queue_exception(vcpu, exit_nr);
kvmppc_booke_queue_exception(vcpu, exit_nr);
vcpu->arch.dear = vcpu->arch.fault_dear;
vcpu->arch.esr = vcpu->arch.fault_esr;
vcpu->stat.dtlb_real_miss_exits++;
@ -360,7 +394,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
if (!gtlbe) {
/* The guest didn't have a mapping for it. */
kvmppc_queue_exception(vcpu, exit_nr);
kvmppc_booke_queue_exception(vcpu, exit_nr);
vcpu->stat.itlb_real_miss_exits++;
break;
}
@ -380,8 +414,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
gtlbe->word2);
} else {
/* Guest mapped and leaped at non-RAM! */
kvmppc_queue_exception(vcpu,
BOOKE_INTERRUPT_MACHINE_CHECK);
kvmppc_booke_queue_exception(vcpu, BOOKE_INTERRUPT_MACHINE_CHECK);
}
break;
@ -409,7 +442,7 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
local_irq_disable();
kvmppc_check_and_deliver_interrupts(vcpu);
kvmppc_core_deliver_interrupts(vcpu);
/* Do some exit accounting. */
vcpu->stat.sum_exits++;

2
arch/powerpc/kvm/emulate.c
View File

@ -139,7 +139,7 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
switch (get_op(inst)) {
case 3: /* trap */
printk("trap!\n");
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
kvmppc_core_queue_program(vcpu);
advance = 0;
break;

98
arch/powerpc/kvm/powerpc.c
View File

@ -99,14 +99,7 @@ void kvm_arch_hardware_unsetup(void)
void kvm_arch_check_processor_compat(void *rtn)
{
int r;
if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
r = 0;
else
r = -ENOTSUPP;
*(int *)rtn = r;
*(int *)rtn = kvmppc_core_check_processor_compat();
}
struct kvm *kvm_arch_create_vm(void)
@ -212,16 +205,14 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
return test_bit(priority, &vcpu->arch.pending_exceptions);
return kvmppc_core_pending_dec(vcpu);
}
static void kvmppc_decrementer_func(unsigned long data)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
kvmppc_core_queue_dec(vcpu);
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(&vcpu->wq);
@ -242,96 +233,25 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
kvmppc_core_destroy_mmu(vcpu);
}
/* 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 kvmppc_disable_debug_interrupts(void)
{
mtmsr(mfmsr() & ~MSR_DE);
}
static void kvmppc_restore_host_debug_state(struct kvm_vcpu *vcpu)
{
kvmppc_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);
}
static void kvmppc_load_guest_debug_registers(struct kvm_vcpu *vcpu)
{
struct kvm_guest_debug *dbg = &vcpu->guest_debug;
u32 dbcr0 = 0;
vcpu->arch.host_msr = mfmsr();
kvmppc_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 kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
int i;
if (vcpu->guest_debug.enabled)
kvmppc_load_guest_debug_registers(vcpu);
kvmppc_core_load_guest_debugstate(vcpu);
/* 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);
kvmppc_core_vcpu_load(vcpu, cpu);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
if (vcpu->guest_debug.enabled)
kvmppc_restore_host_debug_state(vcpu);
kvmppc_core_load_host_debugstate(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. */
_tlbil_all();
kvmppc_core_vcpu_put(vcpu);
}
int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
@ -460,7 +380,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
vcpu->arch.dcr_needed = 0;
}
kvmppc_check_and_deliver_interrupts(vcpu);
kvmppc_core_deliver_interrupts(vcpu);
local_irq_disable();
kvm_guest_enter();
@ -478,7 +398,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
kvmppc_core_queue_external(vcpu, irq);
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(&vcpu->wq);