Hi Andre,
On 3/15/21 3:33 PM, Andre Przywara wrote:
> With the planned retirement of the special ioport emulation code, we
> need to provide an emulation function compatible with the MMIO prototype.
>
> Adjust the trap handler to use that new function, and provide shims to
> implement the old ioport interface, for now.
The diff looks nice and tidy. I checked that the changes are functionally
identical, also did a quick kvm-unit-tests run and booted an arm64 kernel:
Reviewed-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
Thanks,
Alex
>
> Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
> ---
> hw/serial.c | 50 +++++++++++++++++++++++++++++++++++++-------------
> 1 file changed, 37 insertions(+), 13 deletions(-)
>
> diff --git a/hw/serial.c b/hw/serial.c
> index b0465d99..3f797452 100644
> --- a/hw/serial.c
> +++ b/hw/serial.c
> @@ -242,18 +242,14 @@ void serial8250__inject_sysrq(struct kvm *kvm, char sysrq)
> sysrq_pending = sysrq;
> }
>
> -static bool serial8250_out(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port,
> - void *data, int size)
> +static bool serial8250_out(struct serial8250_device *dev, struct kvm_cpu *vcpu,
> + u16 offset, void *data)
> {
> - struct serial8250_device *dev = ioport->priv;
> - u16 offset;
> bool ret = true;
> char *addr = data;
>
> mutex_lock(&dev->mutex);
>
> - offset = port - dev->iobase;
> -
> switch (offset) {
> case UART_TX:
> if (dev->lcr & UART_LCR_DLAB) {
> @@ -336,16 +332,13 @@ static void serial8250_rx(struct serial8250_device *dev, void *data)
> }
> }
>
> -static bool serial8250_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
> +static bool serial8250_in(struct serial8250_device *dev, struct kvm_cpu *vcpu,
> + u16 offset, void *data)
> {
> - struct serial8250_device *dev = ioport->priv;
> - u16 offset;
> bool ret = true;
>
> mutex_lock(&dev->mutex);
>
> - offset = port - dev->iobase;
> -
> switch (offset) {
> case UART_RX:
> if (dev->lcr & UART_LCR_DLAB)
> @@ -389,6 +382,37 @@ static bool serial8250_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port,
> return ret;
> }
>
> +static void serial8250_mmio(struct kvm_cpu *vcpu, u64 addr, u8 *data, u32 len,
> + u8 is_write, void *ptr)
> +{
> + struct serial8250_device *dev = ptr;
> +
> + if (is_write)
> + serial8250_out(dev, vcpu, addr - dev->iobase, data);
> + else
> + serial8250_in(dev, vcpu, addr - dev->iobase, data);
> +}
> +
> +static bool serial8250_ioport_out(struct ioport *ioport, struct kvm_cpu *vcpu,
> + u16 port, void *data, int size)
> +{
> + struct serial8250_device *dev = ioport->priv;
> +
> + serial8250_mmio(vcpu, port, data, 1, true, dev);
> +
> + return true;
> +}
> +
> +static bool serial8250_ioport_in(struct ioport *ioport, struct kvm_cpu *vcpu,
> + u16 port, void *data, int size)
> +{
> + struct serial8250_device *dev = ioport->priv;
> +
> + serial8250_mmio(vcpu, port, data, 1, false, dev);
> +
> + return true;
> +}
> +
> #ifdef CONFIG_HAS_LIBFDT
>
> char *fdt_stdout_path = NULL;
> @@ -427,8 +451,8 @@ void serial8250_generate_fdt_node(void *fdt, struct device_header *dev_hdr,
> #endif
>
> static struct ioport_operations serial8250_ops = {
> - .io_in = serial8250_in,
> - .io_out = serial8250_out,
> + .io_in = serial8250_ioport_in,
> + .io_out = serial8250_ioport_out,
> };
>
> static int serial8250__device_init(struct kvm *kvm,
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