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BACKPORT: FROMLIST: iommu/arm-smmu-v3-kvm: Add map, unmap and iova_to_phys operations

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Add map, unmap and iova_to_phys, which are forwarded to the
hypervisor.

Link: https://lore.kernel.org/all/20241212180423.1578358-51-smostafa@google.com/

Bug: 357781595
Bug: 384432312

Change-Id: Ia632b8a6c6b521982493572dbf594e4a379ed87e
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
This commit is contained in:
Mostafa Saleh
2024-12-12 18:04:14 +00:00
parent 6cb3ecc7be
commit 069b1882e0
1 changed files with 72 additions and 0 deletions
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drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-kvm.c
+72
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@@ -331,6 +331,75 @@ static bool kvm_arm_smmu_capable(struct device *dev, enum iommu_cap cap)
}
}
static int kvm_arm_smmu_map_pages(struct iommu_domain *domain,
unsigned long iova, phys_addr_t paddr,
size_t pgsize, size_t pgcount, int prot,
gfp_t gfp, size_t *total_mapped)
{
size_t mapped;
size_t size = pgsize * pgcount;
struct kvm_arm_smmu_domain *kvm_smmu_domain = to_kvm_smmu_domain(domain);
struct arm_smccc_res res;
do {
res = kvm_call_hyp_nvhe_smccc(__pkvm_host_iommu_map_pages,
kvm_smmu_domain->id,
iova, paddr, pgsize, pgcount, prot);
mapped = res.a1;
iova += mapped;
paddr += mapped;
WARN_ON(mapped % pgsize);
WARN_ON(mapped > pgcount * pgsize);
pgcount -= mapped / pgsize;
*total_mapped += mapped;
} while (*total_mapped < size && !kvm_arm_smmu_topup_memcache(&res, gfp));
if (*total_mapped < size)
return -EINVAL;
return 0;
}
static size_t kvm_arm_smmu_unmap_pages(struct iommu_domain *domain,
unsigned long iova, size_t pgsize,
size_t pgcount,
struct iommu_iotlb_gather *iotlb_gather)
{
size_t unmapped;
size_t total_unmapped = 0;
size_t size = pgsize * pgcount;
struct kvm_arm_smmu_domain *kvm_smmu_domain = to_kvm_smmu_domain(domain);
struct arm_smccc_res res;
do {
res = kvm_call_hyp_nvhe_smccc(__pkvm_host_iommu_unmap_pages,
kvm_smmu_domain->id,
iova, pgsize, pgcount);
unmapped = res.a1;
total_unmapped += unmapped;
iova += unmapped;
WARN_ON(unmapped % pgsize);
pgcount -= unmapped / pgsize;
/*
* The page table driver can unmap less than we asked for. If it
* didn't unmap anything at all, then it either reached the end
* of the range, or it needs a page in the memcache to break a
* block mapping.
*/
} while (total_unmapped < size &&
(unmapped || !kvm_arm_smmu_topup_memcache(&res, GFP_ATOMIC)));
return total_unmapped;
}
static phys_addr_t kvm_arm_smmu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
struct kvm_arm_smmu_domain *kvm_smmu_domain = to_kvm_smmu_domain(domain);
return kvm_call_hyp_nvhe(__pkvm_host_iommu_iova_to_phys, kvm_smmu_domain->id, iova);
}
static struct iommu_ops kvm_arm_smmu_ops = {
.capable = kvm_arm_smmu_capable,
.device_group = arm_smmu_device_group,
@@ -344,6 +413,9 @@ static struct iommu_ops kvm_arm_smmu_ops = {
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = kvm_arm_smmu_attach_dev,
.free = kvm_arm_smmu_domain_free,
.map_pages = kvm_arm_smmu_map_pages,
.unmap_pages = kvm_arm_smmu_unmap_pages,
.iova_to_phys = kvm_arm_smmu_iova_to_phys,
}
};