mirror of https://gitee.com/openkylin/linux.git
KVM: ARM: Fix calculation of virtual CPU ID
KVM does not have a notion of multiple clusters for CPUs, just a linear array of CPUs. When using a system with cores in more than one cluster, the current method for calculating the virtual MPIDR will leak the (physical) cluster information into the virtual MPIDR. One effect of this is that Linux under KVM fails to boot multiple CPUs that aren't in the 0th cluster. This patch does away with exposing the real MPIDR fields in favour of simply using the virtual CPU number (but preserving the U bit, as before). Signed-off-by: Jonathan Austin <jonathan.austin@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
parent
740edfc0a3
commit
1158fca401
|
@ -27,14 +27,11 @@
|
|||
static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
|
||||
{
|
||||
/*
|
||||
* Compute guest MPIDR:
|
||||
* (Even if we present only one VCPU to the guest on an SMP
|
||||
* host we don't set the U bit in the MPIDR, or vice versa, as
|
||||
* revealing the underlying hardware properties is likely to
|
||||
* be the best choice).
|
||||
* Compute guest MPIDR. No need to mess around with different clusters
|
||||
* but we read the 'U' bit from the underlying hardware directly.
|
||||
*/
|
||||
vcpu->arch.cp15[c0_MPIDR] = (read_cpuid_mpidr() & ~MPIDR_LEVEL_MASK)
|
||||
| (vcpu->vcpu_id & MPIDR_LEVEL_MASK);
|
||||
vcpu->arch.cp15[c0_MPIDR] = (read_cpuid_mpidr() & MPIDR_SMP_BITMASK)
|
||||
| vcpu->vcpu_id;
|
||||
}
|
||||
|
||||
#include "coproc.h"
|
||||
|
|
Loading…
Reference in New Issue