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| author | Oliver Upton <oliver.upton@linux.dev> | 2022-08-16 21:25:54 +0200 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-08-17 11:29:07 +0200 |
| commit | b10d86fb8e46cc812171728bcd326df2f34e9ed5 (patch) | |
| tree | c09436e916099e931372589f3d755c4839e36df1 /arch | |
| parent | KVM: arm64: Treat PMCR_EL1.LC as RES1 on asymmetric systems (diff) | |
| download | linux-b10d86fb8e46cc812171728bcd326df2f34e9ed5.tar.xz linux-b10d86fb8e46cc812171728bcd326df2f34e9ed5.zip | |
KVM: arm64: Reject 32bit user PSTATE on asymmetric systems
KVM does not support AArch32 EL0 on asymmetric systems. To that end,
prevent userspace from configuring a vCPU in such a state through
setting PSTATE.
It is already ABI that KVM rejects such a write on a system where
AArch32 EL0 is unsupported. Though the kernel's definition of a 32bit
system changed in commit 2122a833316f ("arm64: Allow mismatched
32-bit EL0 support"), KVM's did not.
Fixes: 2122a833316f ("arm64: Allow mismatched 32-bit EL0 support")
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220816192554.1455559-3-oliver.upton@linux.dev
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kvm/guest.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c index 8c607199cad1..f802a3b3f8db 100644 --- a/arch/arm64/kvm/guest.c +++ b/arch/arm64/kvm/guest.c @@ -242,7 +242,7 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg) u64 mode = (*(u64 *)valp) & PSR_AA32_MODE_MASK; switch (mode) { case PSR_AA32_MODE_USR: - if (!system_supports_32bit_el0()) + if (!kvm_supports_32bit_el0()) return -EINVAL; break; case PSR_AA32_MODE_FIQ: |