superrob1500
/
mirror-linux
mirror of https://github.com/torvalds/linux
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

KVM: arm64: Reject non compliant SMCCC function calls in pKVM 

Prevent the propagation of a function-id that has the top bits set since
this is not compliant with the SMCCC spec and can overlap with the
already known function-id decoders. (eg. if we invoke an smc with
0xffffffffc4000012 it will be decoded as a PSCI reset call). Instead,
make it clear that we don't support it and return an error.

Signed-off-by: Sebastian Ene <sebastianene@google.com>
Link: https://patch.msgid.link/20260408114118.422604-1-sebastianene@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
master
Sebastian Ene 2026-04-08 11:41:18 +00:00 committed by Marc Zyngier
parent a0e6ae45af
commit 480ea48cad
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm64/kvm/hyp/nvhe/hyp-main.c
View File

@ -805,6 +805,10 @@ static void handle_host_smc(struct kvm_cpu_context *host_ctxt)
}
func_id &= ~ARM_SMCCC_CALL_HINTS;
if (upper_32_bits(func_id)) {
cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED;
goto exit_skip_instr;
}
handled = kvm_host_psci_handler(host_ctxt, func_id);
if (!handled)