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KVM: arm64: Set CSV2 for guests on hardware unaffected by Spectre-v2

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If the system is not affected by Spectre-v2, then advertise to the KVM
guest that it is not affected, without the need for a safelist in the
guest.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2020-09-16 00:07:05 +01:00 committed by Will Deacon
parent d4647f0a2a
commit e1026237f9
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/kvm/sys_regs.c
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@ -1131,6 +1131,9 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
if (!vcpu_has_sve(vcpu))
val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
val &= ~(0xfUL << ID_AA64PFR0_AMU_SHIFT);
if (!(val & (0xfUL << ID_AA64PFR0_CSV2_SHIFT)) &&
arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
val |= (1UL << ID_AA64PFR0_CSV2_SHIFT);
} else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) {
val &= ~((0xfUL << ID_AA64ISAR1_APA_SHIFT) |
(0xfUL << ID_AA64ISAR1_API_SHIFT) |