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[added,to,the,3.18,stable,tree] kvm: add a memslot flag for incoherent memory regions

Message ID 1431343152-19437-1-git-send-email-sasha.levin@oracle.com
State New
Headers show

Commit Message

Sasha Levin May 11, 2015, 11:16 a.m. UTC 
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

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>
---
 include/linux/kvm_host.h | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a6059bd..e4d8f70 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