When generating a device tree for a guest, it is useful to have a helper
for converting host addresses to guest addresses in order to populate
the device nodes correctly.
This patch adds such a helper, following a similar implementation to the
reverse translation function that already exists.
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
---
tools/kvm/include/kvm/kvm.h | 1 +
tools/kvm/kvm.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/tools/kvm/include/kvm/kvm.h b/tools/kvm/include/kvm/kvm.h
index 5fb2fb2..b54ac03 100644
--- a/tools/kvm/include/kvm/kvm.h
+++ b/tools/kvm/include/kvm/kvm.h
@@ -106,6 +106,7 @@ bool kvm__arch_cpu_supports_vm(void);
void kvm__arch_periodic_poll(struct kvm *kvm);
void *guest_flat_to_host(struct kvm *kvm, u64 offset);
+u64 host_to_guest_flat(struct kvm *kvm, void *ptr);
int load_flat_binary(struct kvm *kvm, int fd_kernel, int fd_initrd, const char *kernel_cmdline);
bool load_bzimage(struct kvm *kvm, int fd_kernel, int fd_initrd, const char *kernel_cmdline, u16 vidmode);
diff --git a/tools/kvm/kvm.c b/tools/kvm/kvm.c
index a7e2628..af19e37 100644
--- a/tools/kvm/kvm.c
+++ b/tools/kvm/kvm.c
@@ -201,6 +201,22 @@ void *guest_flat_to_host(struct kvm *kvm, u64 offset)
return NULL;
}
+u64 host_to_guest_flat(struct kvm *kvm, void *ptr)
+{
+ struct kvm_mem_bank *bank;
+
+ list_for_each_entry(bank, &kvm->mem_banks, list) {
+ void *bank_start = bank->host_addr;
+ void *bank_end = bank_start + bank->size;
+
+ if (ptr >= bank_start && ptr < bank_end)
+ return bank->guest_phys_addr + (ptr - bank_start);
+ }
+
+ pr_warning("unable to translate host address %p to guest", ptr);
+ return 0;
+}
+
int kvm__recommended_cpus(struct kvm *kvm)
{
int ret;
--
1.8.0
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
