diff options
| author | Tirumalesh Chalamarla <tchalamarla@caviumnetworks.com> | 2016-02-10 10:46:53 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-15 08:27:43 +0200 |
| commit | 849e28efb04c4c46f6189f75e30d3f541eb6dfb4 (patch) | |
| tree | 806f80f7d4f2fa4cecc79d08e0f6fb5008515e1c /arch/arm64/kvm | |
| parent | d5251a1952bff1148ceeea5283e34d07a502da62 (diff) | |
arm64: KVM: Configure TCR_EL2.PS at runtime
[ Upstream commit 3c5b1d92b3b02be07873d611a27950addff544d3 ]
Setting TCR_EL2.PS to 40 bits is wrong on systems with less that
less than 40 bits of physical addresses. and breaks KVM on systems
where the RAM is above 40 bits.
This patch uses ID_AA64MMFR0_EL1.PARange to set TCR_EL2.PS dynamically,
just like we already do for VTCR_EL2.PS.
[Marc: rewrote commit message, patch tidy up]
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Tirumalesh Chalamarla <tchalamarla@caviumnetworks.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/hyp-init.S | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S index 178ba2248a98..84c338f017b2 100644 --- a/arch/arm64/kvm/hyp-init.S +++ b/arch/arm64/kvm/hyp-init.S @@ -64,7 +64,7 @@ __do_hyp_init: mrs x4, tcr_el1 ldr x5, =TCR_EL2_MASK and x4, x4, x5 - ldr x5, =TCR_EL2_FLAGS + mov x5, #TCR_EL2_RES1 orr x4, x4, x5 #ifndef CONFIG_ARM64_VA_BITS_48 @@ -85,15 +85,18 @@ __do_hyp_init: ldr_l x5, idmap_t0sz bfi x4, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH #endif - msr tcr_el2, x4 - - ldr x4, =VTCR_EL2_FLAGS /* * Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS bits in - * VTCR_EL2. + * TCR_EL2 and VTCR_EL2. */ mrs x5, ID_AA64MMFR0_EL1 bfi x4, x5, #16, #3 + + msr tcr_el2, x4 + + ldr x4, =VTCR_EL2_FLAGS + bfi x4, x5, #16, #3 + msr vtcr_el2, x4 mrs x4, mair_el1 |