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hv: vtd: fix potential dead loop if qi request timeout 

Fix potential dead loop if qi request timeout.

Tracked-On: #4680
Signed-off-by: Binbin Wu <binbin.wu@intel.com>
This commit is contained in:
Binbin Wu 2020-04-21 05:55:04 +00:00 committed by wenlingz
parent 764d7c1332
commit 65ec6f3f3b
1 changed files with 3 additions and 5 deletions
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8
hypervisor/arch/x86/vtd.c
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@ -547,7 +547,7 @@ static void dmar_issue_qi_request(struct dmar_drhd_rt *dmar_unit, struct dmar_en
{
struct dmar_entry *invalidate_desc_ptr;
uint32_t qi_status = 0U;
__unused uint64_t start;
uint64_t start;
invalidate_desc_ptr = (struct dmar_entry *)(dmar_unit->qi_queue + dmar_unit->qi_tail);
@ -565,12 +565,10 @@ static void dmar_issue_qi_request(struct dmar_drhd_rt *dmar_unit, struct dmar_en
iommu_write32(dmar_unit, DMAR_IQT_REG, dmar_unit->qi_tail);
start = rdtsc();
while (qi_status == DMAR_INV_STATUS_INCOMPLETE) {
if (qi_status == DMAR_INV_STATUS_COMPLETED) {
break;
}
while (qi_status != DMAR_INV_STATUS_COMPLETED) {
if ((rdtsc() - start) > CYCLES_PER_MS) {
pr_err("DMAR OP Timeout! @ %s", __func__);
break;
}
asm_pause();
}