From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Mon, 4 May 2015 01:25:05 +0000 (+0800)
Subject: kvm: add a memslot flag for incoherent memory regions
X-Git-Tag: v3.18.14~221
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=02f88a7f2ae921317c91f629d61c39e107b9af23;p=thirdparty%2Fkernel%2Fstable.git

kvm: add a memslot flag for incoherent memory regions

commit 1050dcda3052912984b26fb6d2695a3f41792000 upstream.

Memory regions may be incoherent with the caches, typically when the
guest has mapped a host system RAM backed memory region as uncached.
Add a flag KVM_MEMSLOT_INCOHERENT so that we can tag these memslots
and handle them appropriately when mapping them.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a6059bdf7b03b..e4d8f705fecd0 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -43,6 +43,7 @@
  * include/linux/kvm_h.
  */
 #define KVM_MEMSLOT_INVALID	(1UL << 16)
+#define KVM_MEMSLOT_INCOHERENT	(1UL << 17)
 
 /* Two fragments for cross MMIO pages. */
 #define KVM_MAX_MMIO_FRAGMENTS	2