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ANDROID: KVM: arm64: Avoid exposing shadow table internals outside of pkvm.c

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There's no reason to make the internal shadow table data directly
accessible outside of pkvm.c, so make it all static and provide an
initialisation function to install the initial pages.

Bug: 216808671
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Idc0908796ebbd2b620494f5d4d6b6055455c8013
This commit is contained in:
Will Deacon
2022-03-10 12:26:18 +00:00
committed by Quentin Perret
parent 102255d1e4
commit e3ca18b7f3
3 changed files with 16 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/kvm/hyp/include/nvhe/pkvm.h
View File

@@ -60,11 +60,10 @@ static inline bool vcpu_is_protected(struct kvm_vcpu *vcpu)
return vcpu->arch.pkvm.shadow_vm->arch.pkvm.enabled;
}
extern struct kvm_shadow_vm **shadow_table;
extern phys_addr_t pvmfw_base;
extern phys_addr_t pvmfw_size;
void hyp_shadow_table_init(void *tbl);
int __pkvm_init_shadow(struct kvm *kvm, void *shadow_va, size_t size, void *pgd);
int __pkvm_teardown_shadow(int shadow_handle);
struct kvm_vcpu *get_shadow_vcpu(int shadow_handle, unsigned int vcpu_idx);

14
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@@ -230,19 +230,25 @@ extern unsigned long hyp_nr_cpus;
* Protects writes to shadow_table, num_shadow_entries, and next_shadow_alloc,
* as well as reads and writes to last_shadow_vcpu_lookup.
*/
DEFINE_HYP_SPINLOCK(shadow_lock);
static DEFINE_HYP_SPINLOCK(shadow_lock);
/*
* The table of shadow entries for protected VMs in hyp.
* Allocated at hyp initialization and setup.
*/
struct kvm_shadow_vm **shadow_table;
static struct kvm_shadow_vm **shadow_table;
/* Current number of vms in the shadow table. */
int num_shadow_entries;
static int num_shadow_entries;
/* The next entry index to try to allocate from. */
int next_shadow_alloc;
static int next_shadow_alloc;
void hyp_shadow_table_init(void *tbl)
{
WARN_ON(shadow_table);
shadow_table = tbl;
}
/*
* Return the shadow vm corresponding to the handle.

7
arch/arm64/kvm/hyp/nvhe/setup.c
View File

@@ -29,6 +29,7 @@ phys_addr_t pvmfw_size;
(unsigned long)__per_cpu_start)
static void *vmemmap_base;
static void *shadow_table_base;
static void *hyp_pgt_base;
static void *host_s2_pgt_base;
static void *ffa_proxy_pages;
@@ -47,8 +48,8 @@ static int divide_memory_pool(void *virt, unsigned long size)
return -ENOMEM;
nr_pages = hyp_shadow_table_pages(sizeof(struct kvm_shadow_vm));
shadow_table = hyp_early_alloc_contig(nr_pages);
if (!shadow_table)
shadow_table_base = hyp_early_alloc_contig(nr_pages);
if (!shadow_table_base)
return -ENOMEM;
nr_pages = hyp_s1_pgtable_pages();
@@ -341,6 +342,8 @@ void __noreturn __pkvm_init_finalise(void)
ret = hyp_ffa_init(ffa_proxy_pages);
if (ret)
goto out;
hyp_shadow_table_init(shadow_table_base);
out:
/*
* We tail-called to here from handle___pkvm_init() and will not return,