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KVM: arm/arm64: Move ioremap calls to create_hyp_io_mappings 

Both HYP io mappings call ioremap, followed by create_hyp_io_mappings.
Let's move the ioremap call into create_hyp_io_mappings itself, which
simplifies the code a bit and allows for further refactoring.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2017-12-04 16:26:09 +00:00
parent b4ef04995d
commit 807a378425
4 changed files with 26 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/include/asm/kvm_mmu.h
View File

@ -50,7 +50,8 @@
#include <asm/stage2_pgtable.h>
int create_hyp_mappings(void *from, void *to, pgprot_t prot);
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
void __iomem **kaddr);
void free_hyp_pgds(void);
void stage2_unmap_vm(struct kvm *kvm);

3
arch/arm64/include/asm/kvm_mmu.h
View File

@ -140,7 +140,8 @@ static inline unsigned long __kern_hyp_va(unsigned long v)
#include <asm/stage2_pgtable.h>
int create_hyp_mappings(void *from, void *to, pgprot_t prot);
int create_hyp_io_mappings(void *from, void *to, phys_addr_t);
int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
void __iomem **kaddr);
void free_hyp_pgds(void);
void stage2_unmap_vm(struct kvm *kvm);

24
virt/kvm/arm/mmu.c
View File

@ -709,26 +709,30 @@ int create_hyp_mappings(void *from, void *to, pgprot_t prot)
}
/**
* create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode
* @from: The kernel start VA of the range
* @to: The kernel end VA of the range (exclusive)
* create_hyp_io_mappings - Map IO into both kernel and HYP
* @phys_addr: The physical start address which gets mapped
* @size: Size of the region being mapped
* @kaddr: Kernel VA for this mapping
*
* The resulting HYP VA is the same as the kernel VA, modulo
* HYP_PAGE_OFFSET.
*/
int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr)
int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size,
void __iomem **kaddr)
{
unsigned long start = kern_hyp_va((unsigned long)from);
unsigned long end = kern_hyp_va((unsigned long)to);
unsigned long start, end;
if (is_kernel_in_hyp_mode())
*kaddr = ioremap(phys_addr, size);
if (!*kaddr)
return -ENOMEM;
if (is_kernel_in_hyp_mode()) {
return 0;
}
/* Check for a valid kernel IO mapping */
if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1))
return -EINVAL;
start = kern_hyp_va((unsigned long)*kaddr);
end = kern_hyp_va((unsigned long)*kaddr + size);
return __create_hyp_mappings(hyp_pgd, PTRS_PER_PGD, start, end,
__phys_to_pfn(phys_addr), PAGE_HYP_DEVICE);
}

31
virt/kvm/arm/vgic/vgic-v2.c
View File

@ -360,16 +360,10 @@ int vgic_v2_probe(const struct gic_kvm_info *info)
if (!PAGE_ALIGNED(info->vcpu.start) ||
!PAGE_ALIGNED(resource_size(&info->vcpu))) {
kvm_info("GICV region size/alignment is unsafe, using trapping (reduced performance)\n");
kvm_vgic_global_state.vcpu_base_va = ioremap(info->vcpu.start,
resource_size(&info->vcpu));
if (!kvm_vgic_global_state.vcpu_base_va) {
kvm_err("Cannot ioremap GICV\n");
return -ENOMEM;
}
ret = create_hyp_io_mappings(kvm_vgic_global_state.vcpu_base_va,
kvm_vgic_global_state.vcpu_base_va + resource_size(&info->vcpu),
info->vcpu.start);
ret = create_hyp_io_mappings(info->vcpu.start,
resource_size(&info->vcpu),
&kvm_vgic_global_state.vcpu_base_va);
if (ret) {
kvm_err("Cannot map GICV into hyp\n");
goto out;
@ -378,26 +372,17 @@ int vgic_v2_probe(const struct gic_kvm_info *info)
static_branch_enable(&vgic_v2_cpuif_trap);
}
kvm_vgic_global_state.vctrl_base = ioremap(info->vctrl.start,
resource_size(&info->vctrl));
if (!kvm_vgic_global_state.vctrl_base) {
kvm_err("Cannot ioremap GICH\n");
ret = -ENOMEM;
ret = create_hyp_io_mappings(info->vctrl.start,
resource_size(&info->vctrl),
&kvm_vgic_global_state.vctrl_base);
if (ret) {
kvm_err("Cannot map VCTRL into hyp\n");
goto out;
}
vtr = readl_relaxed(kvm_vgic_global_state.vctrl_base + GICH_VTR);
kvm_vgic_global_state.nr_lr = (vtr & 0x3f) + 1;
ret = create_hyp_io_mappings(kvm_vgic_global_state.vctrl_base,
kvm_vgic_global_state.vctrl_base +
resource_size(&info->vctrl),
info->vctrl.start);
if (ret) {
kvm_err("Cannot map VCTRL into hyp\n");
goto out;
}
ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2);
if (ret) {
kvm_err("Cannot register GICv2 KVM device\n");