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| author | Dave Martin <Dave.Martin@arm.com> | 2016-01-19 19:20:18 +0300 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-01-25 00:55:58 +0300 |
| commit | a7e0ac295d964086af3bf98352614f33c381213e (patch) | |
| tree | 7529af0368e5df69e650d5fda9ba73b6667406c7 /arch/arm64/include | |
| parent | 8fc153cda9c9e6aed2a4a7235970dd6c6cb6e954 (diff) | |
| download | linux-a7e0ac295d964086af3bf98352614f33c381213e.tar.xz | |
arm64: KVM: Obey RES0/1 reserved bits when setting CPTR_EL2
Some bits in CPTR are defined as RES1 in the architecture. Setting
these bits to zero may unintentionally enable future architecture
extensions, allowing guests to use them without supervision by the host.
This would be bad: for forwards compatibility, this patch makes
sure the affected bits are always written with 1, not 0.
This patch only addresses CPTR_EL2. Initialisation of other system
registers may still need review.
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_arm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 738a95f93e49..bef6e9243c63 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -182,6 +182,7 @@ #define CPTR_EL2_TCPAC (1 << 31) #define CPTR_EL2_TTA (1 << 20) #define CPTR_EL2_TFP (1 << CPTR_EL2_TFP_SHIFT) +#define CPTR_EL2_DEFAULT 0x000033ff /* Hyp Debug Configuration Register bits */ #define MDCR_EL2_TDRA (1 << 11) |