From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Tue, 14 May 2013 15:14:00 +0100 Subject: [PATCH v4 32/32] arm64: KVM: document kernel object mappings in HYP In-Reply-To: <1368540840-26750-1-git-send-email-marc.zyngier@arm.com> References: <1368540840-26750-1-git-send-email-marc.zyngier@arm.com> Message-ID: <1368540840-26750-33-git-send-email-marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org HYP mode has access to some of the kernel pages. Document the memory mapping and the offset between kernel VA and HYP VA. Signed-off-by: Marc Zyngier --- Documentation/arm64/memory.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/arm64/memory.txt b/Documentation/arm64/memory.txt index 5f583af..78a37712 100644 --- a/Documentation/arm64/memory.txt +++ b/Documentation/arm64/memory.txt @@ -73,3 +73,10 @@ Translation table lookup with 64KB pages: | | +--------------------------> [41:29] L2 index (only 38:29 used) | +-------------------------------> [47:42] L1 index (not used) +-------------------------------------------------> [63] TTBR0/1 + +When using KVM, the hypervisor maps kernel pages in EL2, at a fixed +offset from the kernel VA (top 24bits of the kernel VA set to zero): + +Start End Size Use +----------------------------------------------------------------------- +0000004000000000 0000007fffffffff 256GB kernel objects mapped in HYP -- 1.8.2.3