KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn
This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.
SPRG4-7 are readable from userspace. On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work. The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits. This
also applies to the already-paravirted SPRG3.
On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips). They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation. I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3. This patch should not
make that situation any worse.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
index 6fefb91..9cd124a 100644
--- a/arch/powerpc/kvm/e500_tlb.c
+++ b/arch/powerpc/kvm/e500_tlb.c
@@ -428,13 +428,14 @@
host_tlb_params[0].ways);
}
-static unsigned int get_tlb_esel(struct kvmppc_vcpu_e500 *vcpu_e500, int tlbsel)
+static unsigned int get_tlb_esel(struct kvm_vcpu *vcpu, int tlbsel)
{
- unsigned int esel = get_tlb_esel_bit(vcpu_e500);
+ struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
+ int esel = get_tlb_esel_bit(vcpu);
if (tlbsel == 0) {
esel &= vcpu_e500->gtlb_params[0].ways - 1;
- esel += gtlb0_set_base(vcpu_e500, vcpu_e500->mas2);
+ esel += gtlb0_set_base(vcpu_e500, vcpu->arch.shared->mas2);
} else {
esel &= vcpu_e500->gtlb_params[tlbsel].entries - 1;
}
@@ -545,20 +546,20 @@
int tlbsel;
/* since we only have two TLBs, only lower bit is used. */
- tlbsel = (vcpu_e500->mas4 >> 28) & 0x1;
+ tlbsel = (vcpu->arch.shared->mas4 >> 28) & 0x1;
victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
- pidsel = (vcpu_e500->mas4 >> 16) & 0xf;
- tsized = (vcpu_e500->mas4 >> 7) & 0x1f;
+ pidsel = (vcpu->arch.shared->mas4 >> 16) & 0xf;
+ tsized = (vcpu->arch.shared->mas4 >> 7) & 0x1f;
- vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
+ vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
- vcpu_e500->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
+ vcpu->arch.shared->mas1 = MAS1_VALID | (as ? MAS1_TS : 0)
| MAS1_TID(vcpu_e500->pid[pidsel])
| MAS1_TSIZE(tsized);
- vcpu_e500->mas2 = (eaddr & MAS2_EPN)
- | (vcpu_e500->mas4 & MAS2_ATTRIB_MASK);
- vcpu_e500->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
- vcpu_e500->mas6 = (vcpu_e500->mas6 & MAS6_SPID1)
+ vcpu->arch.shared->mas2 = (eaddr & MAS2_EPN)
+ | (vcpu->arch.shared->mas4 & MAS2_ATTRIB_MASK);
+ vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
+ vcpu->arch.shared->mas6 = (vcpu->arch.shared->mas6 & MAS6_SPID1)
| (get_cur_pid(vcpu) << 16)
| (as ? MAS6_SAS : 0);
}
@@ -844,15 +845,15 @@
int tlbsel, esel;
struct kvm_book3e_206_tlb_entry *gtlbe;
- tlbsel = get_tlb_tlbsel(vcpu_e500);
- esel = get_tlb_esel(vcpu_e500, tlbsel);
+ tlbsel = get_tlb_tlbsel(vcpu);
+ esel = get_tlb_esel(vcpu, tlbsel);
gtlbe = get_entry(vcpu_e500, tlbsel, esel);
- vcpu_e500->mas0 &= ~MAS0_NV(~0);
- vcpu_e500->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
- vcpu_e500->mas1 = gtlbe->mas1;
- vcpu_e500->mas2 = gtlbe->mas2;
- vcpu_e500->mas7_3 = gtlbe->mas7_3;
+ vcpu->arch.shared->mas0 &= ~MAS0_NV(~0);
+ vcpu->arch.shared->mas0 |= MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
+ vcpu->arch.shared->mas1 = gtlbe->mas1;
+ vcpu->arch.shared->mas2 = gtlbe->mas2;
+ vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
return EMULATE_DONE;
}
@@ -860,8 +861,8 @@
int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *vcpu, int rb)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
- int as = !!get_cur_sas(vcpu_e500);
- unsigned int pid = get_cur_spid(vcpu_e500);
+ int as = !!get_cur_sas(vcpu);
+ unsigned int pid = get_cur_spid(vcpu);
int esel, tlbsel;
struct kvm_book3e_206_tlb_entry *gtlbe = NULL;
gva_t ea;
@@ -879,26 +880,30 @@
if (gtlbe) {
esel &= vcpu_e500->gtlb_params[tlbsel].ways - 1;
- vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
+ vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel)
| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
- vcpu_e500->mas1 = gtlbe->mas1;
- vcpu_e500->mas2 = gtlbe->mas2;
- vcpu_e500->mas7_3 = gtlbe->mas7_3;
+ vcpu->arch.shared->mas1 = gtlbe->mas1;
+ vcpu->arch.shared->mas2 = gtlbe->mas2;
+ vcpu->arch.shared->mas7_3 = gtlbe->mas7_3;
} else {
int victim;
/* since we only have two TLBs, only lower bit is used. */
- tlbsel = vcpu_e500->mas4 >> 28 & 0x1;
+ tlbsel = vcpu->arch.shared->mas4 >> 28 & 0x1;
victim = (tlbsel == 0) ? gtlb0_get_next_victim(vcpu_e500) : 0;
- vcpu_e500->mas0 = MAS0_TLBSEL(tlbsel) | MAS0_ESEL(victim)
+ vcpu->arch.shared->mas0 = MAS0_TLBSEL(tlbsel)
+ | MAS0_ESEL(victim)
| MAS0_NV(vcpu_e500->gtlb_nv[tlbsel]);
- vcpu_e500->mas1 = (vcpu_e500->mas6 & MAS6_SPID0)
- | (vcpu_e500->mas6 & (MAS6_SAS ? MAS1_TS : 0))
- | (vcpu_e500->mas4 & MAS4_TSIZED(~0));
- vcpu_e500->mas2 &= MAS2_EPN;
- vcpu_e500->mas2 |= vcpu_e500->mas4 & MAS2_ATTRIB_MASK;
- vcpu_e500->mas7_3 &= MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3;
+ vcpu->arch.shared->mas1 =
+ (vcpu->arch.shared->mas6 & MAS6_SPID0)
+ | (vcpu->arch.shared->mas6 & (MAS6_SAS ? MAS1_TS : 0))
+ | (vcpu->arch.shared->mas4 & MAS4_TSIZED(~0));
+ vcpu->arch.shared->mas2 &= MAS2_EPN;
+ vcpu->arch.shared->mas2 |= vcpu->arch.shared->mas4 &
+ MAS2_ATTRIB_MASK;
+ vcpu->arch.shared->mas7_3 &= MAS3_U0 | MAS3_U1 |
+ MAS3_U2 | MAS3_U3;
}
kvmppc_set_exit_type(vcpu, EMULATED_TLBSX_EXITS);
@@ -929,19 +934,19 @@
struct kvm_book3e_206_tlb_entry *gtlbe;
int tlbsel, esel;
- tlbsel = get_tlb_tlbsel(vcpu_e500);
- esel = get_tlb_esel(vcpu_e500, tlbsel);
+ tlbsel = get_tlb_tlbsel(vcpu);
+ esel = get_tlb_esel(vcpu, tlbsel);
gtlbe = get_entry(vcpu_e500, tlbsel, esel);
if (get_tlb_v(gtlbe))
inval_gtlbe_on_host(vcpu_e500, tlbsel, esel);
- gtlbe->mas1 = vcpu_e500->mas1;
- gtlbe->mas2 = vcpu_e500->mas2;
- gtlbe->mas7_3 = vcpu_e500->mas7_3;
+ gtlbe->mas1 = vcpu->arch.shared->mas1;
+ gtlbe->mas2 = vcpu->arch.shared->mas2;
+ gtlbe->mas7_3 = vcpu->arch.shared->mas7_3;
- trace_kvm_gtlb_write(vcpu_e500->mas0, gtlbe->mas1, gtlbe->mas2,
+ trace_kvm_gtlb_write(vcpu->arch.shared->mas0, gtlbe->mas1, gtlbe->mas2,
(u32)gtlbe->mas7_3, (u32)(gtlbe->mas7_3 >> 32));
/* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */