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Re: [Qemu-devel] [RFC PATCH v2 09/21] pc: Add dimm paravirt SRAT info


From: Vasilis Liaskovitis
Subject: Re: [Qemu-devel] [RFC PATCH v2 09/21] pc: Add dimm paravirt SRAT info
Date: Fri, 13 Jul 2012 19:40:32 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Thu, Jul 12, 2012 at 07:48:04PM +0000, Blue Swirl wrote:
> On Wed, Jul 11, 2012 at 10:31 AM, Vasilis Liaskovitis
> <address@hidden> wrote:
> > The numa_fw_cfg paravirt interface is extended to include SRAT information 
> > for
> > all hotplug-able dimms. There are 3 words for each hotplug-able memory slot,
> > denoting start address, size and node proximity. The new info is appended 
> > after
> > existing numa info, so that the fw_cfg layout does not break.  This 
> > information
> > is used by Seabios to build hotplug memory device objects at runtime.
> > nb_numa_nodes is set to 1 by default (not 0), so that we always pass srat 
> > info
> > to SeaBIOS.
> >
> > v1->v2:
> > Dimm SRAT info (#dimms) is appended at end of existing numa fw_cfg in order 
> > not
> > to break existing layout
> > Documentation of the new fwcfg layout is included in docs/specs/fwcfg.txt
> >
> > Signed-off-by: Vasilis Liaskovitis <address@hidden>
> > ---
> >  docs/specs/fwcfg.txt |   28 ++++++++++++++++++++++++++
> >  hw/pc.c              |   53 
> > ++++++++++++++++++++++++++++++++++++++++++++++++-
> >  vl.c                 |    2 +-
> >  3 files changed, 80 insertions(+), 3 deletions(-)
> >  create mode 100644 docs/specs/fwcfg.txt
> >
> > diff --git a/docs/specs/fwcfg.txt b/docs/specs/fwcfg.txt
> > new file mode 100644
> > index 0000000..e6fcd8f
> > --- /dev/null
> > +++ b/docs/specs/fwcfg.txt
> > @@ -0,0 +1,28 @@
> > +QEMU<->BIOS Paravirt Documentation
> > +--------------------------------------
> > +
> > +This document describes paravirt data structures passed from QEMU to BIOS.
> > +
> > +fw_cfg SRAT paravirt info
> > +--------------------
> > +The SRAT info passed from QEMU to BIOS has the following layout:
> > +
> > +-----------------------------------------------------------------------------------------------
> > +#nodes | cpu0_pxm | cpu1_pxm | ... | cpulast_pxm | node0_mem | node1_mem | 
> > ... | nodelast_mem
> > +
> > +-----------------------------------------------------------------------------------------------
> > +#dimms | dimm0_start | dimm0_sz | dimm0_pxm | ... | dimmlast_start | 
> > dimmlast_sz | dimmlast_pxm
> > +
> > +Entry 0 contains the number of numa nodes (nb_numa_nodes).
> > +
> > +Entries 1..max_cpus: The next max_cpus entries describe node proximity for 
> > each
> > +one of the vCPUs in the system.
> > +
> > +Entries max_cpus+1..max_cpus+nb_numa_nodes+1:  The next nb_numa_nodes 
> > entries
> > +describe the memory size for each one of the NUMA nodes in the system.
> > +
> > +Entry max_cpus+nb_numa_nodes+1 contains the number of memory dimms 
> > (nb_hp_dimms)
> > +
> > +The last 3 * nb_hp_dimms entries are organized in triplets: Each triplet 
> > contains
> > +the physical address offset, size (in bytes), and node proximity for the
> > +respective dimm.
> 
> The size and endianness are not specified, you are using LE 64 bit
> values for each item.

thanks, I 'll update.

> 
> > diff --git a/hw/pc.c b/hw/pc.c
> > index ef9901a..cf651d0 100644
> > --- a/hw/pc.c
> > +++ b/hw/pc.c
> > @@ -598,12 +598,15 @@ int e820_add_entry(uint64_t address, uint64_t length, 
> > uint32_t type)
> >      return index;
> >  }
> >
> > +static void setup_hp_dimms(uint64_t *fw_cfg_slots);
> > +
> >  static void *bochs_bios_init(void)
> >  {
> >      void *fw_cfg;
> >      uint8_t *smbios_table;
> >      size_t smbios_len;
> >      uint64_t *numa_fw_cfg;
> > +    uint64_t *hp_dimms_fw_cfg;
> >      int i, j;
> >
> >      register_ioport_write(0x400, 1, 2, bochs_bios_write, NULL);
> > @@ -638,8 +641,10 @@ static void *bochs_bios_init(void)
> >      /* allocate memory for the NUMA channel: one (64bit) word for the 
> > number
> >       * of nodes, one word for each VCPU->node and one word for each node to
> >       * hold the amount of memory.
> > +     * Finally one word for the number of hotplug memory slots and three 
> > words
> > +     * for each hotplug memory slot (start address, size and node 
> > proximity).
> >       */
> > -    numa_fw_cfg = g_malloc0((1 + max_cpus + nb_numa_nodes) * 8);
> > +    numa_fw_cfg = g_malloc0((2 + max_cpus + nb_numa_nodes + 3 * 
> > nb_hp_dimms) * 8);
> >      numa_fw_cfg[0] = cpu_to_le64(nb_numa_nodes);
> >      for (i = 0; i < max_cpus; i++) {
> >          for (j = 0; j < nb_numa_nodes; j++) {
> > @@ -652,8 +657,15 @@ static void *bochs_bios_init(void)
> >      for (i = 0; i < nb_numa_nodes; i++) {
> >          numa_fw_cfg[max_cpus + 1 + i] = cpu_to_le64(node_mem[i]);
> >      }
> > +
> > +    numa_fw_cfg[1 + max_cpus + nb_numa_nodes] = cpu_to_le64(nb_hp_dimms);
> > +
> > +    hp_dimms_fw_cfg = numa_fw_cfg + 2 + max_cpus + nb_numa_nodes;
> > +    if (nb_hp_dimms)
> > +        setup_hp_dimms(hp_dimms_fw_cfg);
> 
> Braces.
> 
> > +
> >      fw_cfg_add_bytes(fw_cfg, FW_CFG_NUMA, (uint8_t *)numa_fw_cfg,
> > -                     (1 + max_cpus + nb_numa_nodes) * 8);
> > +                     (2 + max_cpus + nb_numa_nodes + 3 * nb_hp_dimms) * 8);
> >
> >      return fw_cfg;
> >  }
> > @@ -1223,3 +1235,40 @@ target_phys_addr_t pc_set_hp_memory_offset(uint64_t 
> > size)
> >
> >      return ret;
> >  }
> > +
> > +static void setup_hp_dimms(uint64_t *fw_cfg_slots)
> > +{
> > +    int i = 0;
> > +    Error *err = NULL;
> > +    DeviceState *dev;
> > +    DimmState *slot;
> > +    const char *type;
> > +    BusChild *kid;
> > +    BusState *bus = sysbus_get_default();
> > +
> > +    QTAILQ_FOREACH(kid, &bus->children, sibling) {
> > +        dev = kid->child;
> > +        type = object_property_get_str(OBJECT(dev), "type", &err);
> > +        if (err) {
> > +            error_free(err);
> > +            fprintf(stderr, "error getting device type\n");
> > +            exit(1);
> > +        }
> > +
> > +        if (!strcmp(type, "dimm")) {
> > +            if (!dev->id) {
> > +                fprintf(stderr, "error getting dimm device id\n");
> > +                exit(1);
> > +            }
> > +            slot = DIMM(dev);
> > +            /* determine starting physical address for this memory slot */
> > +            assert(slot->start);
> > +            fw_cfg_slots[3 * slot->idx] = cpu_to_le64(slot->start);
> > +            fw_cfg_slots[3 * slot->idx + 1] = cpu_to_le64(slot->size);
> > +            fw_cfg_slots[3 * slot->idx + 2] = cpu_to_le64(slot->node);
> > +            i++;
> > +        }
> > +    }
> > +    assert(i == nb_hp_dimms);
> > +}
> > +
> > diff --git a/vl.c b/vl.c
> > index 0ff8818..37c9798 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -2335,7 +2335,7 @@ int main(int argc, char **argv, char **envp)
> >          node_cpumask[i] = 0;
> >      }
> >
> > -    nb_numa_nodes = 0;
> > +    nb_numa_nodes = 1;
> >      nb_nics = 0;
> >
> >      autostart= 1;
> > --
> > 1.7.9
> >
> >



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