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Re: [Qemu-devel] [PATCH v2 4/4] xen-all: Pass max_ram_below_4g to xen_hv
From: |
Stefano Stabellini |
Subject: |
Re: [Qemu-devel] [PATCH v2 4/4] xen-all: Pass max_ram_below_4g to xen_hvm_init. |
Date: |
Mon, 17 Mar 2014 17:55:23 +0000 |
User-agent: |
Alpine 2.02 (DEB 1266 2009-07-14) |
On Mon, 17 Mar 2014, Don Slutz wrote:
> On 03/16/14 12:10, Stefano Stabellini wrote:
> > On Tue, 11 Mar 2014, Don Slutz wrote:
> > > This is the xen part of "pc & q35: Add new object pc-memory-layout."
> > >
> > > Signed-off-by: Don Slutz<address@hidden>
> > > ---
> > > hw/i386/pc_piix.c | 4 ++--
> > > hw/i386/pc_q35.c | 4 ++--
> > > include/hw/xen/xen.h | 4 ++--
> > > xen-all.c | 41 ++++++++++++++++++++++-------------------
> > > xen-stub.c | 4 ++--
> > > 5 files changed, 30 insertions(+), 27 deletions(-)
> > >
> > > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> > > index 964ea33..691fc5d 100644
> > > --- a/hw/i386/pc_piix.c
> > > +++ b/hw/i386/pc_piix.c
> > > @@ -131,8 +131,8 @@ static void pc_init1(QEMUMachineInitArgs *args,
> > > below_4g_mem_size = args->ram_size;
> > > }
> > > - if (xen_enabled() && xen_hvm_init(&below_4g_mem_size,
> > > &above_4g_mem_size,
> > > - &ram_memory) != 0) {
> > > + if (xen_enabled() && xen_hvm_init(max_ram_below_4g,
> > > &below_4g_mem_size,
> > > + &above_4g_mem_size, &ram_memory) !=
> > > 0) {
> > > fprintf(stderr, "xen hardware virtual machine initialisation
> > > failed\n");
> > > exit(1);
> > > }
> > > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> > > index c95e6e2..8e1c417 100644
> > > --- a/hw/i386/pc_q35.c
> > > +++ b/hw/i386/pc_q35.c
> > > @@ -120,8 +120,8 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
> > > below_4g_mem_size = args->ram_size;
> > > }
> > > - if (xen_enabled() && xen_hvm_init(&below_4g_mem_size,
> > > &above_4g_mem_size,
> > > - &ram_memory) != 0) {
> > > + if (xen_enabled() && xen_hvm_init(max_ram_below_4g,
> > > &below_4g_mem_size,
> > > + &above_4g_mem_size, &ram_memory) !=
> > > 0) {
> > > fprintf(stderr, "xen hardware virtual machine initialisation
> > > failed\n");
> > > exit(1);
> > > }
> > > diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
> > > index 0769db2..fda559a 100644
> > > --- a/include/hw/xen/xen.h
> > > +++ b/include/hw/xen/xen.h
> > > @@ -41,8 +41,8 @@ int xen_init(QEMUMachine *machine);
> > > void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
> > > #if defined(NEED_CPU_H) && !defined(CONFIG_USER_ONLY)
> > > -int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t
> > > *above_4g_mem_size,
> > > - MemoryRegion **ram_memory);
> > > +int xen_hvm_init(ram_addr_t max_ram_below_4g, ram_addr_t
> > > *below_4g_mem_size,
> > > + ram_addr_t *above_4g_mem_size, MemoryRegion
> > > **ram_memory);
> > > void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
> > > struct MemoryRegion *mr);
> > > void xen_modified_memory(ram_addr_t start, ram_addr_t length);
> > > diff --git a/xen-all.c b/xen-all.c
> > > index c64300c..48ba335 100644
> > > --- a/xen-all.c
> > > +++ b/xen-all.c
> > > @@ -155,32 +155,34 @@ qemu_irq *xen_interrupt_controller_init(void)
> > > /* Memory Ops */
> > > -static void xen_ram_init(ram_addr_t *below_4g_mem_size,
> > > +static void xen_ram_init(ram_addr_t ram_size, ram_addr_t
> > > max_ram_below_4g,
> > > + ram_addr_t *below_4g_mem_size,
> > > ram_addr_t *above_4g_mem_size,
> > > - ram_addr_t ram_size, MemoryRegion
> > > **ram_memory_p)
> > > + MemoryRegion **ram_memory_p)
> > > {
> > > MemoryRegion *sysmem = get_system_memory();
> > > ram_addr_t block_len;
> > > - block_len = ram_size;
> > > - if (ram_size >= HVM_BELOW_4G_RAM_END) {
> > > - /* Xen does not allocate the memory continuously, and keep a hole
> > > at
> > > - * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
> > > - */
> > > - block_len += HVM_BELOW_4G_MMIO_LENGTH;
> > > + if (!max_ram_below_4g) {
> > > + if (ram_size >= HVM_BELOW_4G_RAM_END) {
> > > + *above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
> > > + *below_4g_mem_size = HVM_BELOW_4G_RAM_END;
> > > + } else {
> > > + *above_4g_mem_size = 0;
> > > + *below_4g_mem_size = ram_size;
> > > + }
> > > + }
> > Instead of treating max_ram_below_4g as a special case, couldn't
> > initialize it to HVM_BELOW_4G_RAM_END?
>
> Since max_ram_below_4g is used and initialize in normal QEMU code
> where HVM_BELOW_4G_RAM_END is not defined, I do not see how to
> do this outside of this routine without adding a new routine for this.
You can simply do this at the beginning of xen_ram_init:
max_ram_below_4g = max_ram_below_4g ? max_ram_below_4g : HVM_BELOW_4G_RAM_END;
my comment was about code readability, I didn't mean change any
functionalities.
[Qemu-devel] [PATCH v2 3/4] pc & q35: Add new object pc-memory-layout., Don Slutz, 2014/03/11