Commit ff384c49 authored by Marc Zyngier's avatar Marc Zyngier Committed by Greg Kroah-Hartman

arm64: KVM: Preserve RES1 bits in SCTLR_EL2

commit d68c1f7f upstream.

__do_hyp_init has the rather bad habit of ignoring RES1 bits and
writing them back as zero. On a v8.0-8.2 CPU, this doesn't do anything
bad, but may end-up being pretty nasty on future revisions of the
architecture.

Let's preserve those bits so that we don't have to fix this later on.
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <cdall@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0d2c539e
......@@ -138,6 +138,10 @@
#define SCTLR_ELx_A (1 << 1)
#define SCTLR_ELx_M 1
#define SCTLR_EL2_RES1 ((1 << 4) | (1 << 5) | (1 << 11) | (1 << 16) | \
(1 << 16) | (1 << 18) | (1 << 22) | (1 << 23) | \
(1 << 28) | (1 << 29))
#define SCTLR_ELx_FLAGS (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | \
SCTLR_ELx_SA | SCTLR_ELx_I)
......
......@@ -102,10 +102,12 @@ __do_hyp_init:
tlbi alle2
dsb sy
mrs x4, sctlr_el2
and x4, x4, #SCTLR_ELx_EE // preserve endianness of EL2
ldr x5, =SCTLR_ELx_FLAGS
orr x4, x4, x5
/*
* Preserve all the RES1 bits while setting the default flags,
* as well as the EE bit on BE.
*/
ldr x4, =(SCTLR_EL2_RES1 | SCTLR_ELx_FLAGS)
CPU_BE( orr x4, x4, #SCTLR_ELx_EE)
msr sctlr_el2, x4
isb
......
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