This series addresses a couple of issues with how KVM exposes SMC64 calls to its guest. It is currently possible for an AArch32 guest to discover the SMC64 SYSTEM_RESET2 function (via PSCI_1_0_FN_PSCI_FEATURES) and even make a call to it. SMCCC does not allow for 64 bit calls to be made from a 32 bit state. Patch 1 cleans up the way we filter SMC64 calls in PSCI. Using a switch with case statements for each possibly-filtered function is asking for trouble. Instead, pivot off of the bit that indicates the desired calling convention. This plugs the PSCI_FEATURES hole for SYSTEM_RESET2. Patch 2 adds a check to the PSCI v1.x call handler in KVM, bailing out early if the guest is not allowed to use a particular function. This closes the door on calls to 64-bit SYSTEM_RESET2 from AArch32. My first crack at this [1] was missing the fix for direct calls to SYSTEM_RESET2. Taking the patch out of that series and sending separately. Applies on top of today's kvmarm pull, commit: 21ea45784275 ("KVM: arm64: fix typos in comments") [1]: https://patchwork.kernel.org/project/kvm/patch/20220311174001.605719-3-oupton@xxxxxxxxxx/ Oliver Upton (2): KVM: arm64: Generally disallow SMC64 for AArch32 guests KVM: arm64: Actually prevent SMC64 SYSTEM_RESET2 from AArch32 arch/arm64/kvm/psci.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) -- 2.35.1.894.gb6a874cedc-goog