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| author | Kristina Martsenko <kristina.martsenko@arm.com> | 2017-12-13 18:07:17 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2017-12-22 18:34:52 +0100 |
| commit | 787fd1d019b269af7912249231dfe34a5fe3e7c8 (patch) | |
| tree | 156a0b9832cc4bd7dfb6e8c30a4cd5c980a64a72 /arch/arm64/kvm/hyp | |
| parent | arm64: add kconfig symbol to configure physical address size (diff) | |
| download | linux-787fd1d019b269af7912249231dfe34a5fe3e7c8.tar.xz linux-787fd1d019b269af7912249231dfe34a5fe3e7c8.zip | |
arm64: limit PA size to supported range
We currently copy the physical address size from
ID_AA64MMFR0_EL1.PARange directly into TCR.(I)PS. This will not work for
4k and 16k granule kernels on systems that support 52-bit physical
addresses, since 52-bit addresses are only permitted with the 64k
granule.
To fix this, fall back to 48 bits when configuring the PA size when the
kernel does not support 52-bit PAs. When it does, fall back to 52, to
avoid similar problems in the future if the PA size is ever increased
above 52.
Tested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
[catalin.marinas@arm.com: tcr_set_pa_size macro renamed to tcr_compute_pa_size]
[catalin.marinas@arm.com: comments added to tcr_compute_pa_size]
[catalin.marinas@arm.com: definitions added for TCR_*PS_SHIFT]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kvm/hyp')
| -rw-r--r-- | arch/arm64/kvm/hyp/s2-setup.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/s2-setup.c b/arch/arm64/kvm/hyp/s2-setup.c index a81f5e10fc8c..603e1ee83e89 100644 --- a/arch/arm64/kvm/hyp/s2-setup.c +++ b/arch/arm64/kvm/hyp/s2-setup.c @@ -32,6 +32,8 @@ u32 __hyp_text __init_stage2_translation(void) * PS is only 3. Fortunately, bit 19 is RES0 in VTCR_EL2... */ parange = read_sysreg(id_aa64mmfr0_el1) & 7; + if (parange > ID_AA64MMFR0_PARANGE_MAX) + parange = ID_AA64MMFR0_PARANGE_MAX; val |= parange << 16; /* Compute the actual PARange... */ |