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DM: fix issue when pass-thru native RTCT SSRAM entries

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Native SSRAM entries with only one LAPIC ID of
  value 0 in local APIC ID table can't be pass-thru
  to guest. Such kind of SSRAM entries are for cache
  regions that are global shared and shall be visible
  to guests.

  This patch refine the building logic of vRTCT to fix
  above issue.

Tracked-On: #6510
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
This commit is contained in:
Yonghua Huang 2021-08-25 17:01:34 +03:00 committed by wenlingz
parent e51837f96d
commit 66608b38dd
1 changed files with 34 additions and 3 deletions
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37
devicemodel/hw/platform/acpi/rtct.c
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@ -266,6 +266,30 @@ static bool is_cache_accessible_to_guest(uint32_t cache_id, uint32_t cache_level
return false;
}
/**
* @brief Check if a given cache is shared.
*
* @param cache_level Cache Level, 2 or 3.
*
* @return true if given cache is shared, else false.
*/
static bool is_cache_shared(uint32_t cache_level)
{
int i;
uint32_t shift[2];
if ((cache_level != 2) && (cache_level != 3))
return false;
shift[0] = guest_l2_cat_shift;
shift[1] = guest_l3_cat_shift;
for (i = 0; i < guest_vcpu_num; i++) {
if ((guest_lapicid_tbl[i] >> shift[cache_level - 2]) != 0)
return false;
}
return true;
}
/**
* @brief Initialize Software SRAM and memory hierarchy entries in virtual RTCT,
* configurations of these entries are from native RTCT.
@ -291,9 +315,16 @@ static int init_vrtct_v1(struct acpi_table_hdr *vrtct, struct acpi_table_hdr *na
memset(lapicids, 0, sizeof(lapicids[ACRN_PLATFORM_LAPIC_IDS_MAX]));
vlapic_num = 0;
for (i = 0; i < plapic_num; i++) {
if (is_pcpu_assigned_to_guest(ssram->apic_id_tbl[i])) {
lapicids[vlapic_num++] = ssram->apic_id_tbl[i];
if (is_cache_shared(ssram->cache_level)) {
lapicids[0] = 0;
vlapic_num = 1;
} else {
for (i = 0; i < plapic_num; i++) {
if (is_pcpu_assigned_to_guest(ssram->apic_id_tbl[i])) {
lapicids[vlapic_num++] = ssram->apic_id_tbl[i];
}
}
}