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BACKPORT: FROMLIST: KVM: arm64: smmu-v3: Add context descriptor functions

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Add functions to allocate and access context descriptors that would
be used in stage-1 attach.

Link: https://lore.kernel.org/all/20241212180423.1578358-35-smostafa@google.com/

Bug: 357781595
Bug: 384432312

Change-Id: Ie5245ecca0c58382cb7bf1cd733204de078e1aa0
Signed-off-by: Mostafa Saleh <smostafa@google.com>
This commit is contained in:
Mostafa Saleh
2024-12-12 18:03:58 +00:00
parent 28f4a6b9de
commit d548fb914b
1 changed files with 53 additions and 0 deletions
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arch/arm64/kvm/hyp/nvhe/iommu/arm-smmu-v3.c
+53
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@@ -215,6 +215,19 @@ static int smmu_sync_ste(struct hyp_arm_smmu_v3_device *smmu, u32 sid)
return smmu_send_cmd(smmu, &cmd);
}
__maybe_unused
static int smmu_sync_cd(struct hyp_arm_smmu_v3_device *smmu, u32 sid, u32 ssid)
{
struct arm_smmu_cmdq_ent cmd = {
.opcode = CMDQ_OP_CFGI_CD,
.cfgi.sid = sid,
.cfgi.ssid = ssid,
.cfgi.leaf = true,
};
return smmu_send_cmd(smmu, &cmd);
}
static int smmu_alloc_l2_strtab(struct hyp_arm_smmu_v3_device *smmu, u32 sid)
{
struct arm_smmu_strtab_cfg *cfg = &smmu->strtab_cfg;
@@ -291,6 +304,46 @@ smmu_get_alloc_ste_ptr(struct hyp_arm_smmu_v3_device *smmu, u32 sid)
return smmu_get_ste_ptr(smmu, sid);
}
__maybe_unused
static u64 *smmu_get_cd_ptr(u64 *cdtab, u32 ssid)
{
/* Only linear supported for now. */
return cdtab + ssid * CTXDESC_CD_DWORDS;
}
__maybe_unused
static u64 *smmu_alloc_cd(struct hyp_arm_smmu_v3_device *smmu, u32 pasid_bits)
{
u64 *cd_table;
int flags = 0;
u32 requested_order = get_order((1 << pasid_bits) *
(CTXDESC_CD_DWORDS << 3));
/*
* We support max of 64K linear tables only, this should be enough
* for 128 pasids
*/
if (WARN_ON(requested_order > 4))
return NULL;
if (!(smmu->features & ARM_SMMU_FEAT_COHERENCY))
flags |= IOMMU_PAGE_NOCACHE;
cd_table = kvm_iommu_donate_pages(requested_order, flags);
if (!cd_table)
return NULL;
return (u64 *)hyp_virt_to_phys(cd_table);
}
__maybe_unused
static void smmu_free_cd(u64 *cd_table, u32 pasid_bits)
{
u32 order = get_order((1 << pasid_bits) *
(CTXDESC_CD_DWORDS << 3));
kvm_iommu_reclaim_pages(cd_table, order);
}
static int smmu_init_registers(struct hyp_arm_smmu_v3_device *smmu)
{
u64 val, old;