[PATCH for-next 07/16] xen/arm: Introduce copy_to_guest_phys_flush_dcache

[Julien Grall <julien.grall@linaro.org>]

This new function will be used in a follow-up patch to copy data to the guest
using the IPA (aka guest physical address) and then clean the cache.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
 xen/arch/arm/guestcopy.c           | 10 ++++++++++
 xen/include/asm-arm/guest_access.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/xen/arch/arm/guestcopy.c b/xen/arch/arm/guestcopy.c
index be53bee559..7958663970 100644
--- a/xen/arch/arm/guestcopy.c
+++ b/xen/arch/arm/guestcopy.c
@@ -110,6 +110,16 @@ unsigned long raw_copy_from_guest(void *to, const void __user *from, unsigned le
                       COPY_from_guest | COPY_linear);
 }
 
+unsigned long copy_to_guest_phys_flush_dcache(struct domain *d,
+                                              paddr_t gpa,
+                                              void *buf,
+                                              unsigned int len)
+{
+    /* P2M is shared between all vCPUs, so the vCPU used does not matter. */
+    return copy_guest(buf, gpa, len, d->vcpu[0],
+                      COPY_to_guest | COPY_ipa | COPY_flush_dcache);
+}
+
 int access_guest_memory_by_ipa(struct domain *d, paddr_t gpa, void *buf,
                                uint32_t size, bool is_write)
 {
diff --git a/xen/include/asm-arm/guest_access.h b/xen/include/asm-arm/guest_access.h
index 6796801cfe..224d2a033b 100644
--- a/xen/include/asm-arm/guest_access.h
+++ b/xen/include/asm-arm/guest_access.h
@@ -11,6 +11,12 @@ unsigned long raw_copy_to_guest_flush_dcache(void *to, const void *from,
 unsigned long raw_copy_from_guest(void *to, const void *from, unsigned len);
 unsigned long raw_clear_guest(void *to, unsigned len);
 
+/* Copy data to guest physical address, then clean the region. */
+unsigned long copy_to_guest_phys_flush_dcache(struct domain *d,
+                                              paddr_t phys,
+                                              void *buf,
+                                              unsigned int len);
+
 int access_guest_memory_by_ipa(struct domain *d, paddr_t ipa, void *buf,
                                uint32_t size, bool is_write);
 
-- 
2.11.0


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