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KVM: arm64: Add build validation for FGT trap mask values

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These checks help ensure that all the bits are accounted for,
that there hasn't been a transcribing error from the spec nor
from the generated mask values, which will be used in subsequent
patches.

Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231214100158.2305400-12-tabba@google.com
This commit is contained in:
Fuad Tabba 2023-12-14 10:01:51 +00:00 committed by Marc Zyngier
parent fc04838f9c
commit 6c4abbea6d
1 changed files with 18 additions and 0 deletions
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18
arch/arm64/kvm/hyp/include/hyp/switch.h
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@ -79,6 +79,16 @@ static inline void __activate_traps_fpsimd32(struct kvm_vcpu *vcpu)
clr |= ~hfg & __ ## reg ## _nMASK; \
} while(0)
/*
* Validate the fine grain trap masks.
* Check that the masks do not overlap and that all bits are accounted for.
*/
#define CHECK_FGT_MASKS(reg) \
do { \
BUILD_BUG_ON((__ ## reg ## _MASK) & (__ ## reg ## _nMASK)); \
BUILD_BUG_ON(~((__ ## reg ## _RES0) ^ (__ ## reg ## _MASK) ^ \
(__ ## reg ## _nMASK))); \
} while(0)
static inline bool cpu_has_amu(void)
{
@ -94,6 +104,14 @@ static inline void __activate_traps_hfgxtr(struct kvm_vcpu *vcpu)
u64 r_clr = 0, w_clr = 0, r_set = 0, w_set = 0, tmp;
u64 r_val, w_val;
CHECK_FGT_MASKS(HFGRTR_EL2);
CHECK_FGT_MASKS(HFGWTR_EL2);
CHECK_FGT_MASKS(HFGITR_EL2);
CHECK_FGT_MASKS(HDFGRTR_EL2);
CHECK_FGT_MASKS(HDFGWTR_EL2);
CHECK_FGT_MASKS(HAFGRTR_EL2);
CHECK_FGT_MASKS(HCRX_EL2);
if (!cpus_have_final_cap(ARM64_HAS_FGT))
return;