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From: Michael S. Tsirkin
Date: Thu Jun 25 2009 - 08:52:46 EST

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markmc@xxxxxxxxxx
Subject: [PATCH] kvm: pass value to in_range callback
Reply-To:

For write transactions, pass the value written to in_range checks so
that we can make each iosignalfd a separate device on kvm bus.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---

Avi, can you please merge this patch in kvm.git so that
Gregory can use it for iosignalfd? Once bus has RCU
we'll be able to remove in_range completely, but
let's do it step by step.

arch/ia64/kvm/kvm-ia64.c | 9 ++++--
arch/x86/kvm/i8254.c | 2 +-
arch/x86/kvm/lapic.c | 2 +-
arch/x86/kvm/x86.c | 60 +++++++++++++++++++++++++-------------------
include/linux/kvm_host.h | 3 +-
virt/kvm/coalesced_mmio.c | 3 +-
virt/kvm/ioapic.c | 3 +-
virt/kvm/iodev.h | 9 +++---
virt/kvm/kvm_main.c | 5 ++-
9 files changed, 56 insertions(+), 40 deletions(-)

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index c1c5cb6..68058c2 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -211,11 +211,13 @@ int kvm_dev_ioctl_check_extension(long ext)
}

static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
- gpa_t addr, int len, int is_write)
+ gpa_t addr, int len, int is_write,
+ void *write_val)
{
struct kvm_io_device *dev;

- dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len, is_write);
+ dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len, is_write,
+ write_val);

return dev;
}
@@ -247,7 +249,8 @@ static int handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
kvm_run->exit_reason = KVM_EXIT_MMIO;
return 0;
mmio:
- mmio_dev = vcpu_find_mmio_dev(vcpu, p->addr, p->size, !p->dir);
+ mmio_dev = vcpu_find_mmio_dev(vcpu, p->addr, p->size,
+ !p->dir, &p->data);
if (mmio_dev) {
if (!p->dir)
kvm_iodevice_write(mmio_dev, p->addr, p->size,
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 331705f..6f84cb2 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -495,7 +495,7 @@ static void pit_ioport_read(struct kvm_io_device *this,
}

static int pit_in_range(struct kvm_io_device *this, gpa_t addr,
- int len, int is_write)
+ int len, int is_write, void *write_val)
{
return ((addr >= KVM_PIT_BASE_ADDRESS) &&
(addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH));
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2e02865..3d08b1d 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -747,7 +747,7 @@ static void apic_mmio_write(struct kvm_io_device *this,
}

static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
- int len, int size)
+ int len, int is_write, void *write_val)
{
struct kvm_lapic *apic = to_lapic(this);
int ret = 0;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5a66bb9..73a56ca 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2265,13 +2265,13 @@ static void kvm_init_msr_list(void)
*/
static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
gpa_t addr, int len,
- int is_write)
+ int is_write, void *write_val)
{
struct kvm_io_device *dev;

if (vcpu->arch.apic) {
dev = &vcpu->arch.apic->dev;
- if (kvm_iodevice_in_range(dev, addr, len, is_write))
+ if (kvm_iodevice_in_range(dev, addr, len, is_write, write_val))
return dev;
}
return NULL;
@@ -2280,14 +2280,14 @@ static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,

static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
gpa_t addr, int len,
- int is_write)
+ int is_write, void *write_val)
{
struct kvm_io_device *dev;

- dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
+ dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write, write_val);
if (dev == NULL)
dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
- is_write);
+ is_write, write_val);
return dev;
}

@@ -2383,7 +2383,7 @@ mmio:
* Is this MMIO handled locally?
*/
mutex_lock(&vcpu->kvm->lock);
- mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
+ mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0, NULL);
mutex_unlock(&vcpu->kvm->lock);
if (mmio_dev) {
kvm_iodevice_read(mmio_dev, gpa, bytes, val);
@@ -2437,7 +2437,7 @@ mmio:
* Is this MMIO handled locally?
*/
mutex_lock(&vcpu->kvm->lock);
- mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
+ mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1, val);
mutex_unlock(&vcpu->kvm->lock);
if (mmio_dev) {
kvm_iodevice_write(mmio_dev, gpa, bytes, val);
@@ -2791,9 +2791,10 @@ static void pio_string_write(struct kvm_io_device *pio_dev,

static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
gpa_t addr, int len,
- int is_write)
+ int is_write, void *write_val)
{
- return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
+ return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write,
+ write_val);
}

int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
@@ -2820,7 +2821,8 @@ int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
memcpy(vcpu->arch.pio_data, &val, 4);

mutex_lock(&vcpu->kvm->lock);
- pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
+ pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in,
+ vcpu->arch.pio_data);
mutex_unlock(&vcpu->kvm->lock);
if (pio_dev) {
kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
@@ -2837,7 +2839,6 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
{
unsigned now, in_page;
int ret = 0;
- struct kvm_io_device *pio_dev;

vcpu->run->exit_reason = KVM_EXIT_IO;
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
@@ -2881,12 +2882,6 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,

vcpu->arch.pio.guest_gva = address;

- mutex_lock(&vcpu->kvm->lock);
- pio_dev = vcpu_find_pio_dev(vcpu, port,
- vcpu->arch.pio.cur_count,
- !vcpu->arch.pio.in);
- mutex_unlock(&vcpu->kvm->lock);
-
if (!vcpu->arch.pio.in) {
/* string PIO write */
ret = pio_copy_data(vcpu);
@@ -2894,16 +2889,29 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
kvm_inject_gp(vcpu, 0);
return 1;
}
- if (ret == 0 && pio_dev) {
- pio_string_write(pio_dev, vcpu);
- complete_pio(vcpu);
- if (vcpu->arch.pio.count == 0)
- ret = 1;
+ if (ret == 0) {
+ struct kvm_io_device *pio_dev;
+ mutex_lock(&vcpu->kvm->lock);
+ pio_dev = vcpu_find_pio_dev(vcpu, port,
+ vcpu->arch.pio.cur_count,
+ 1, vcpu->arch.pio_data);
+ mutex_unlock(&vcpu->kvm->lock);
+ if (pio_dev) {
+ pio_string_write(pio_dev, vcpu);
+ complete_pio(vcpu);
+ if (vcpu->arch.pio.count == 0)
+ ret = 1;
+ }
}
- } else if (pio_dev)
- pr_unimpl(vcpu, "no string pio read support yet, "
- "port %x size %d count %ld\n",
- port, size, count);
+ } else {
+ mutex_lock(&vcpu->kvm->lock);
+ if (vcpu_find_pio_dev(vcpu, port, vcpu->arch.pio.cur_count, 0,
+ NULL))
+ pr_unimpl(vcpu, "no string pio read support yet, "
+ "port %x size %d count %ld\n",
+ port, size, count);
+ mutex_unlock(&vcpu->kvm->lock);
+ }

return ret;
}
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2451f48..7b2bd9b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -60,7 +60,8 @@ struct kvm_io_bus {
void kvm_io_bus_init(struct kvm_io_bus *bus);
void kvm_io_bus_destroy(struct kvm_io_bus *bus);
struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
- gpa_t addr, int len, int is_write);
+ gpa_t addr, int len, int is_write,
+ void *write_val);
void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
struct kvm_io_device *dev);

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 397f419..9561bc2 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -20,7 +20,8 @@ static inline struct kvm_coalesced_mmio_dev *to_mmio(struct kvm_io_device *dev)
}

static int coalesced_mmio_in_range(struct kvm_io_device *this,
- gpa_t addr, int len, int is_write)
+ gpa_t addr, int len, int is_write,
+ void *write_val)
{
struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
struct kvm_coalesced_mmio_zone *zone;
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index d8b2eca..fa3f4fb 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -228,7 +228,8 @@ static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
}

static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
- int len, int is_write)
+ int len, int is_write,
+ void *write_val)
{
struct kvm_ioapic *ioapic = to_ioapic(this);

diff --git a/virt/kvm/iodev.h b/virt/kvm/iodev.h
index 2c67f5a..d8cf9e2 100644
--- a/virt/kvm/iodev.h
+++ b/virt/kvm/iodev.h
@@ -30,7 +30,7 @@ struct kvm_io_device_ops {
int len,
const void *val);
int (*in_range)(struct kvm_io_device *this, gpa_t addr, int len,
- int is_write);
+ int is_write, void *write_val);
void (*destructor)(struct kvm_io_device *this);
};

@@ -61,10 +61,11 @@ static inline void kvm_iodevice_write(struct kvm_io_device *dev,
dev->ops->write(dev, addr, len, val);
}

-static inline int kvm_iodevice_in_range(struct kvm_io_device *dev,
- gpa_t addr, int len, int is_write)
+static inline int kvm_iodevice_inrange(struct kvm_io_device *dev,
+ gpa_t addr, int len, int is_write,
+ void *write_val)
{
- return dev->ops->in_range(dev, addr, len, is_write);
+ return dev->ops->in_range(dev, addr, len, is_write, write_val);
}

static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 58d6bc6..f5dfe02 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2485,14 +2485,15 @@ void kvm_io_bus_destroy(struct kvm_io_bus *bus)
}

struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
- gpa_t addr, int len, int is_write)
+ gpa_t addr, int len, int is_write,
+ void *write_val)
{
int i;

for (i = 0; i < bus->dev_count; i++) {
struct kvm_io_device *pos = bus->devs[i];

- if (kvm_iodevice_in_range(pos, addr, len, is_write))
+ if (kvm_iodevice_in_range(pos, addr, len, is_write, write_val))
return pos;
}

--
1.6.2.2
--
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