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hv: vtd: cleanup snoop control related code

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Snoop control will not be turned on by hypervisor, delete snoop control
related code.

Tracked-On: #4831
Signed-off-by: Binbin Wu <binbin.wu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Binbin Wu 2020-05-08 01:46:26 +00:00 committed by wenlingz
parent a94c3ef763
commit 3009d9399f
3 changed files with 5 additions and 27 deletions
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7
hypervisor/arch/x86/Kconfig
View File

@ -340,13 +340,6 @@ config MCE_ON_PSC_WORKAROUND_DISABLED
the software workaround has negative impact on performance. If all the guest OS
kernels are trusted, this option may be set for performance.
config IOMMU_ENFORCE_SNP
bool "IOMMU enforce snoop behavior of DMA operation"
default n
help
GPU IOMMU doesn't support snoop control capability,
To enable gvt-d,disable IOMMU snoop control by default.
config ENFORCE_TURNOFF_AC
bool "Force to disable #AC for Split-locked Access"
default n

20
hypervisor/arch/x86/vtd.c
View File

@ -278,6 +278,11 @@ static inline uint8_t iommu_cap_rwbf(uint64_t cap)
return ((uint8_t)(cap >> 4U) & 1U);
}
static inline uint8_t iommu_ecap_sc(uint64_t ecap)
{
return ((uint8_t)(ecap >> 7U) & 1U);
}
static void dmar_unit_show_capability(struct dmar_drhd_rt *dmar_unit)
{
pr_info("dmar unit[0x%x]", dmar_unit->drhd->reg_base_addr);
@ -482,17 +487,6 @@ static int32_t dmar_register_hrhd(struct dmar_drhd_rt *dmar_unit)
if ((iommu_ecap_c(dmar_unit->ecap) == 0U) && (!dmar_unit->drhd->ignore)) {
iommu_page_walk_coherent = false;
}
/* when the hardware support snoop control,
* to make sure snoop control is always enabled,
* the SNP filed in the leaf PTE should be set.
* How to guarantee it when EPT is used as second-level
* translation paging structures?
*/
if (iommu_ecap_sc(dmar_unit->ecap) == 0U) {
dev_dbg(DBG_LEVEL_IOMMU, "dmar uint doesn't support snoop control!");
}
dmar_disable_translation(dmar_unit);
}
@ -1020,10 +1014,6 @@ static int32_t iommu_attach_device(const struct iommu_domain *domain, uint8_t bu
pr_err("invalid dmar unit");
ret = -EINVAL;
} else {
if (iommu_ecap_sc(dmar_unit->ecap) == 0U) {
dev_dbg(DBG_LEVEL_IOMMU, "vm=%d add %x:%x no snoop control!", domain->vm_id, bus, devfun);
}
root_table = (struct dmar_entry *)hpa2hva(dmar_unit->root_table_addr);
root_entry = root_table + bus;

5
hypervisor/include/arch/x86/vtd.h
View File

@ -212,11 +212,6 @@ static inline uint8_t iommu_ecap_pt(uint64_t ecap)
return ((uint8_t)(ecap >> 6U) & 1U);
}
static inline uint8_t iommu_ecap_sc(uint64_t ecap)
{
return ((uint8_t)(ecap >> 7U) & 1U);
}
static inline uint16_t iommu_ecap_iro(uint64_t ecap)
{
return ((uint16_t)(ecap >> 8U) & 0x3ffU);