On Mon, Feb 06, 2017 at 10:23:37AM +0800, Eli Qiao wrote:

This patch expose cache information to host's capabilites xml.

For l3 cache allocation
<cache>
<bank id='0' type='l3' size='56320' unit='KiB' cpus='0-21,44-65'>
<control min='2816' reserved='2816' unit='KiB' scope='L3'/>
</bank>
<bank id='1' type='l3' size='56320' unit='KiB' cpus='22-43,66-87'>
<control min='2816' reserved='2816' unit='KiB' scope='L3'/>
</bank>
</cache>

For l3 cache allocation supported cdp(seperate data/code):
<cache>
<bank id='0' type='l3' size='56320' unit='KiB' cpus='0-21,44-65'>
<control min='2816' reserved='2816' unit='KiB' scope='L3DATA'/>
<control min='2816' reserved='2816' unit='KiB' scope='L3CODE'/>
</bank>
<bank id='1' type='l3' size='56320' unit='KiB' cpus='22-43,66-87'>
<control min='2816' reserved='2816' unit='KiB' scope='L3DATA'/>
<control min='2816' reserved='2816' unit='KiB' scope='L3CODE'/>
</bank>
</cache>

RFC on mailing list.
https://www.redhat.com/archives/libvir-list/2017-January/msg00644.html

Signed-off-by: Eli Qiao <liyong.qiao@intel.com>
---
src/conf/capabilities.c | 56 ++++++++++++++++++++++++++++++++++++
src/conf/capabilities.h | 23 +++++++++++++++
src/libvirt_private.syms | 1 +
src/qemu/qemu_capabilities.c | 68 ++++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_driver.c | 4 +++
5 files changed, 152 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 3247d25..23f416d 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -45,6 +45,7 @@
#include "qemu_domain.h"
#define __QEMU_CAPSRIV_H_ALLOW__
#include "qemu_capspriv.h"
+#include "virresctrl.h"

#include <fcntl.h>
#include <sys/stat.h>
@@ -1098,7 +1099,71 @@ virQEMUCapsInitCPU(virCapsPtr caps,
goto cleanup;
}

+static int
+virQEMUCapsInitCache(virCapsPtr caps)
+{
+ int i, j;
+ virResCtrlPtr resctrl;
+ virCapsHostCacheBankPtr bank;
+
+ for (i = 0; i < RDT_NUM_RESOURCES; i ++)
+ {
+ /* L3DATA and L3CODE share L3 resources */
+ if ( i == RDT_RESOURCE_L3CODE )
+ continue;

+ resctrl = virResCtrlGet(i);
+
+ if(resctrl->enabled) {
+ for( j = 0; j < resctrl->num_banks; j++)
+ {
+ if(VIR_RESIZE_N(caps->host.cachebank, caps->host.ncachebank_max,
+ caps->host.ncachebank, 1) < 0)
+ return -1;
+
+ if(VIR_ALLOC(bank) < 0)
+ return -1;
+
+ bank->id = resctrl->cache_banks[j].host_id;
+ if(VIR_STRDUP(bank->type, resctrl->cache_level) < 0)
+ goto err;
+ if(VIR_STRDUP(bank->cpus, virBitmapFormat(resctrl->cache_banks[j].cpu_mask)) < 0)
+ goto err;
+ bank->size = resctrl->cache_banks[j].cache_size;
+ /*L3DATA and L3CODE shares L3 cache resources, so fill them to the control element*/
+ if ( i == RDT_RESOURCE_L3DATA ) {
+ if(VIR_EXPAND_N(bank->control, bank->ncontrol, 2) < 0)
+ goto err;
+
+ bank->control[0].min = virResCtrlGet(RDT_RESOURCE_L3DATA)->cache_banks[j].cache_min;
+ bank->control[0].reserved = bank->control[0].min * (virResCtrlGet(RDT_RESOURCE_L3DATA)->min_cbm_bits);
+ if(VIR_STRDUP(bank->control[0].scope,
+ virResCtrlGet(RDT_RESOURCE_L3DATA)->name) < 0)
+ goto err;
+
+ bank->control[1].min = virResCtrlGet(RDT_RESOURCE_L3CODE)->cache_banks[j].cache_min;
+ bank->control[1].reserved = bank->control[1].min * (virResCtrlGet(RDT_RESOURCE_L3CODE)->min_cbm_bits);
+ if(VIR_STRDUP(bank->control[1].scope,
+ virResCtrlGet(RDT_RESOURCE_L3CODE)->name) < 0)
+ goto err;
+ }
+ else {
+ if(VIR_EXPAND_N(bank->control, bank->ncontrol, 1) < 0)
+ goto err;
+ bank->control[0].min = resctrl->cache_banks[j].cache_min;
+ bank->control[0].reserved = bank->control[0].min * resctrl->min_cbm_bits;
+ if(VIR_STRDUP(bank->control[0].scope, resctrl->name) < 0)
+ goto err;
+ }
+ caps->host.cachebank[caps->host.ncachebank++] = bank;
+ }
+ }
+ }
+ return 0;
+err:
+ VIR_FREE(bank);
+ return -1;
+}

I don't think this code should be in the QEMU driver - better to have

it in nodeinfo.c so it is common to all drivers.