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ANDROID: vendor_hooks: Add vendor hook for GenieZone demand paging

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Add Android kernel vendor hooks before and after VM demand paging to
enable calls to vendor modules for memory protection. This enhancement
ensures that memory protection mechanisms are properly invoked during
the demand paging process, improving the overall security and
stability of the system.

This feature is particularly important for systems that rely on
multiple IOMMU components to manage memory protection, ensuring that
all necessary preparation are properly applied during the demand
paging process.

Bug: 367160986
Signed-off-by: Willix Yeh <chi-shen.yeh@mediatek.com>
Signed-off-by: Liju Chen <liju-clr.chen@mediatek.com>
Change-Id: I7e8b441ebcb030950960fcb39137fdcf3c18977c
This commit is contained in:
Willix Yeh 2024-09-13 14:17:34 +08:00 committed by Treehugger Robot
parent 72c0d01fd0
commit ab4754de1c
4 changed files with 28 additions and 0 deletions
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3
drivers/android/vendor_hooks.c
View File

@ -291,6 +291,9 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_do_el1_fpac);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_handle_bad_stack);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_panic_unhandled);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gzvm_vcpu_exit_reason);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gzvm_handle_demand_page_pre);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gzvm_handle_demand_page_post);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_gzvm_destroy_vm_post_process);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_mutex_list_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_unlock_slowpath);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_mutex_unlock_slowpath_before_wakeq);

9
drivers/virt/geniezone/gzvm_mmu.c
View File

@ -4,6 +4,7 @@
*/
#include <linux/soc/mediatek/gzvm_drv.h>
#include <trace/hooks/gzvm.h>
static int cmp_ppages(struct rb_node *node, const struct rb_node *parent)
{
@ -160,10 +161,14 @@ static int handle_single_demand_page(struct gzvm *vm, int memslot_id, u64 gfn)
if (unlikely(ret))
return -EFAULT;
trace_android_vh_gzvm_handle_demand_page_pre(vm, memslot_id, pfn, gfn, 1);
ret = gzvm_arch_map_guest(vm->vm_id, memslot_id, pfn, gfn, 1);
if (unlikely(ret))
return -EFAULT;
trace_android_vh_gzvm_handle_demand_page_post(vm, memslot_id, pfn, gfn, 1);
return ret;
}
@ -200,6 +205,8 @@ static int handle_block_demand_page(struct gzvm *vm, int memslot_id, u64 gfn)
vm->demand_page_buffer[i] = pfn;
}
trace_android_vh_gzvm_handle_demand_page_pre(vm, memslot_id, 0, gfn, nr_entries);
ret = gzvm_arch_map_guest_block(vm->vm_id, memslot_id, start_gfn,
nr_entries);
if (unlikely(ret)) {
@ -207,6 +214,8 @@ static int handle_block_demand_page(struct gzvm *vm, int memslot_id, u64 gfn)
goto err_unlock;
}
trace_android_vh_gzvm_handle_demand_page_post(vm, memslot_id, 0, gfn, nr_entries);
err_unlock:
mutex_unlock(&vm->demand_paging_lock);

3
drivers/virt/geniezone/gzvm_vm.c
View File

@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/soc/mediatek/gzvm_drv.h>
#include <linux/debugfs.h>
#include <trace/hooks/gzvm.h>
#include "gzvm_common.h"
static DEFINE_MUTEX(gzvm_list_lock);
@ -375,6 +376,8 @@ static void gzvm_destroy_vm(struct gzvm *gzvm)
mutex_unlock(&gzvm->lock);
trace_android_vh_gzvm_destroy_vm_post_process(gzvm);
/* No need to lock here becauese it's single-threaded execution */
gzvm_destroy_all_ppage(gzvm);

13
include/trace/hooks/gzvm.h
View File

@ -6,11 +6,24 @@
#define _TRACE_HOOK_GZVM_H
#include <trace/hooks/vendor_hooks.h>
struct gzvm_vcpu;
struct gzvm;
DECLARE_HOOK(android_vh_gzvm_vcpu_exit_reason,
TP_PROTO(struct gzvm_vcpu *vcpu, bool *userspace),
TP_ARGS(vcpu, userspace));
DECLARE_HOOK(android_vh_gzvm_handle_demand_page_pre,
TP_PROTO(struct gzvm *vm, int memslot_id, u64 pfn, u64 gfn, u32 nr_entries),
TP_ARGS(vm, memslot_id, pfn, gfn, nr_entries));
DECLARE_HOOK(android_vh_gzvm_handle_demand_page_post,
TP_PROTO(struct gzvm *vm, int memslot_id, u64 pfn, u64 gfn, u32 nr_entries),
TP_ARGS(vm, memslot_id, pfn, gfn, nr_entries));
DECLARE_HOOK(android_vh_gzvm_destroy_vm_post_process,
TP_PROTO(struct gzvm *vm),
TP_ARGS(vm));
#endif /* _TRACE_HOOK_GZVM_H */
/* This part must be outside protection */
#include <trace/define_trace.h>