Re: [PATCH 03/04] qemu-kvm: Remove the dependency for phys_ram_base

Zhang, Xiantao wrote:
> From aaf97331da3d6cd34522441218c8c9ab3c1067f6 Mon Sep 17 00:00:00 2001
> From: Xiantao Zhang <[email protected]>
> Date: Tue, 28 Apr 2009 16:55:47 +0800
> Subject: [PATCH] qemu-kvm: Remove the dependency for phys_ram_base for ipf.c
>  
> Upstream has dropped phys_ram_base, so ia64 also remove
> the dependency for that.
>  
> +++ b/hw/ipf.c
> @@ -54,7 +54,8 @@ static fdctrl_t *floppy_controller;
>  static RTCState *rtc_state;
>  static PCIDevice *i440fx_state;
>  
> -uint8_t *g_fw_start;
> +ram_addr_t gfw_start;
> +
>  static uint32_t ipf_to_legacy_io(target_phys_addr_t addr)
>  {
>      return (uint32_t)(((addr&0x3ffffff) >> 12 << 2)|((addr) & 0x3));
> @@ -454,15 +455,15 @@ static void ipf_init1(ram_addr_t ram_size, int vga_ram_size,
>      if (kvm_enabled()) {
>          unsigned long  image_size;
>          char *image = NULL;
> -        uint8_t *fw_image_start;
> +        ram_addr_t fw_image_start;
>          unsigned long nvram_addr = 0;
>          unsigned long nvram_fd = 0;
>          unsigned long type = READ_FROM_NVRAM;
>          unsigned long i = 0;
> -        ram_addr_t fw_offset = qemu_ram_alloc(GFW_SIZE);
> -        uint8_t *fw_start = phys_ram_base + fw_offset;
>  
> -        g_fw_start = fw_start;
> +        ram_addr  = qemu_ram_alloc(GFW_SIZE);
> +        gfw_start = (ram_addr_t)qemu_get_ram_ptr(ram_addr);
>   

qemu_get_ram_ptr() returns a pointer.  Don't cast it to a ram_addr_t, 
leave it a pointer.

But why not use cpu_physical_memory_write() (or 
cpu_physical_memory_write_rom())?  It's much simpler and cleaner.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.