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KVM: arm64: nv: Don't advance PC when pending an SVE exception

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Jan reports that running a nested guest on Neoverse-V2 leads to a WARN
in the host due to simultaneously pending an exception and PC increment
after an access to ZCR_EL2.

Returning true from a sysreg accessor is an indication that the sysreg
instruction has been retired. Of course this isn't the case when we've
pended a synchronous SVE exception for the guest. Fix the return value
and let the exception propagate to the guest as usual.

Reported-by: Jan Kotas <jank@cadence.com>
Closes: https://lore.kernel.org/kvmarm/865xd61tt5.wl-maz@kernel.org/
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2025-09-26 12:41:08 -07:00
parent ed25dcfbc4
commit 9a1950f977
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/sys_regs.c
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@ -2704,7 +2704,7 @@ static bool access_zcr_el2(struct kvm_vcpu *vcpu,
if (guest_hyp_sve_traps_enabled(vcpu)) {
kvm_inject_nested_sve_trap(vcpu);
return true;
return false;
}
if (!p->is_write) {