| Message ID | 20190523103502.25925-4-sudeep.holla@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: KVM: add SPE profiling support for guest | expand |
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c index 22b4c335e0b2..9b2461138ddc 100644 --- a/arch/arm64/kvm/hyp/switch.c +++ b/arch/arm64/kvm/hyp/switch.c @@ -202,9 +202,7 @@ void deactivate_traps_vhe_put(void) { u64 mdcr_el2 = read_sysreg(mdcr_el2); - mdcr_el2 &= MDCR_EL2_HPMN_MASK | - MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT | - MDCR_EL2_TPMS; + mdcr_el2 &= MDCR_EL2_HPMN_MASK | MDCR_EL2_TPMS; write_sysreg(mdcr_el2, mdcr_el2);
On VHE systems, the reset value for MDCR_EL2.E2PB=b00 which defaults to profiling buffer using the EL2 stage 1 translations. However if the guest are allowed to use profiling buffers changing E2PB settings, we need to ensure we resume back MDCR_EL2.E2PB=b00. Currently we just do bitwise '&' with MDCR_EL2_E2PB_MASK which will retain the value. So fix it by clearing all the bits in E2PB. Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> --- arch/arm64/kvm/hyp/switch.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)