layerscape: add patches-5.4

[openwrt/staging/wigyori.git] / target / linux / layerscape / patches-5.4 / 811-kvm-0001-arm64-KVM-support-flushing-device-memory.patch

diff --git a/target/linux/layerscape/patches-5.4/811-kvm-0001-arm64-KVM-support-flushing-device-memory.patch b/target/linux/layerscape/patches-5.4/811-kvm-0001-arm64-KVM-support-flushing-device-memory.patch
new file mode 100644 (file)
index 0000000..7c9bc07
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/811-kvm-0001-arm64-KVM-support-flushing-device-memory.patch
@@ -0,0 +1,42 @@
+From aa9e99f77f92814a0d83af8e6ed3148458d0f611 Mon Sep 17 00:00:00 2001
+From: Laurentiu Tudor <laurentiu.tudor@nxp.com>
+Date: Tue, 26 Jul 2016 15:43:43 +0300
+Subject: [PATCH] arm64: KVM: support flushing device memory
+
+In the current implementation, trying to flush
+memory not covered by the linear map (e.g. device
+memory) causes a crash. Add support for flushing
+"non-normal" memory by explicitly ioremap()-ing
+it when such a case appears and do the cache flush
+through this temporary mapping.
+This allows dropping the special checks for qman
+cacheable region when doing cache flushes.
+
+Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
+[fixed formatting issue]
+Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
+---
+ arch/arm64/include/asm/kvm_mmu.h | 12 ++++++++++--
+ 1 file changed, 10 insertions(+), 2 deletions(-)
+
+--- a/arch/arm64/include/asm/kvm_mmu.h
++++ b/arch/arm64/include/asm/kvm_mmu.h
+@@ -341,8 +341,16 @@ static inline void __invalidate_icache_g
+ static inline void __kvm_flush_dcache_pte(pte_t pte)
+ {
+       if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) {
+-              struct page *page = pte_page(pte);
+-              kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE);
++              if (pfn_valid(pte_pfn(pte))) {
++                      struct page *page = pte_page(pte);
++
++                      kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE);
++              } else {
++                      void __iomem *va = ioremap_cache_ns(pte_pfn(pte) << PAGE_SHIFT, PAGE_SIZE);
++
++                      kvm_flush_dcache_to_poc(va, PAGE_SIZE);
++                      iounmap(va);
++              }
+       }
+ }
+