For faster handling of PCI translation refreshes, intercept in KVM and call the associated handler. Signed-off-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxx> --- arch/s390/kvm/priv.c | 46 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 417154b314a6..546c99a0e0b6 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -29,6 +29,7 @@ #include <asm/ap.h> #include "gaccess.h" #include "kvm-s390.h" +#include "pci.h" #include "trace.h" static int handle_ri(struct kvm_vcpu *vcpu) @@ -335,6 +336,49 @@ static int handle_rrbe(struct kvm_vcpu *vcpu) return 0; } +static int handle_rpcit(struct kvm_vcpu *vcpu) +{ + int reg1, reg2; + int rc; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + /* KVM can only handle if we support KVM-managed IOMMU */ + if (!IS_ENABLED(CONFIG_S390_KVM_IOMMU)) + return -EOPNOTSUPP; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + /* If the device has a SHM bit on, let userspace take care of this */ + if (((vcpu->run->s.regs.gprs[reg1] >> 32) & aift->mdd) != 0) + return -EOPNOTSUPP; + + rc = kvm_s390_pci_refresh_trans(vcpu, vcpu->run->s.regs.gprs[reg1], + vcpu->run->s.regs.gprs[reg2], + vcpu->run->s.regs.gprs[reg2 + 1]); + + switch (rc) { + case 0: + kvm_s390_set_psw_cc(vcpu, 0); + break; + case -ENOMEM: + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00ffffffUL; + vcpu->run->s.regs.gprs[reg1] |= (u64)4 << 24; + kvm_s390_set_psw_cc(vcpu, 1); + break; + case -EIO: + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00ffffffUL; + vcpu->run->s.regs.gprs[reg1] |= (u64)16 << 24; + kvm_s390_set_psw_cc(vcpu, 1); + break; + default: + kvm_s390_set_psw_cc(vcpu, 3); + } + + return 0; +} + #define SSKE_NQ 0x8 #define SSKE_MR 0x4 #define SSKE_MC 0x2 @@ -1275,6 +1319,8 @@ int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) return handle_essa(vcpu); case 0xaf: return handle_pfmf(vcpu); + case 0xd3: + return handle_rpcit(vcpu); default: return -EOPNOTSUPP; } -- 2.27.0