Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 234 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_tm.c b/arch/powerpc/kvm/book3s_hv_tm.c
new file mode 100644
index 000000000..e7fd60cf9
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_hv_tm.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright 2017 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kvm_host.h>
+
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+#include <asm/kvm_book3s_64.h>
+#include <asm/reg.h>
+#include <asm/ppc-opcode.h>
+
+static void emulate_tx_failure(struct kvm_vcpu *vcpu, u64 failure_cause)
+{
+	u64 texasr, tfiar;
+	u64 msr = vcpu->arch.shregs.msr;
+
+	tfiar = vcpu->arch.regs.nip & ~0x3ull;
+	texasr = (failure_cause << 56) | TEXASR_ABORT | TEXASR_FS | TEXASR_EXACT;
+	if (MSR_TM_SUSPENDED(vcpu->arch.shregs.msr))
+		texasr |= TEXASR_SUSP;
+	if (msr & MSR_PR) {
+		texasr |= TEXASR_PR;
+		tfiar |= 1;
+	}
+	vcpu->arch.tfiar = tfiar;
+	/* Preserve ROT and TL fields of existing TEXASR */
+	vcpu->arch.texasr = (vcpu->arch.texasr & 0x3ffffff) | texasr;
+}
+
+/*
+ * This gets called on a softpatch interrupt on POWER9 DD2.2 processors.
+ * We expect to find a TM-related instruction to be emulated.  The
+ * instruction image is in vcpu->arch.emul_inst.  If the guest was in
+ * TM suspended or transactional state, the checkpointed state has been
+ * reclaimed and is in the vcpu struct.  The CPU is in virtual mode in
+ * host context.
+ */
+int kvmhv_p9_tm_emulation(struct kvm_vcpu *vcpu)
+{
+	u32 instr = vcpu->arch.emul_inst;
+	u64 msr = vcpu->arch.shregs.msr;
+	u64 newmsr, bescr;
+	int ra, rs;
+
+	/*
+	 * rfid, rfebb, and mtmsrd encode bit 31 = 0 since it's a reserved bit
+	 * in these instructions, so masking bit 31 out doesn't change these
+	 * instructions. For treclaim., tsr., and trechkpt. instructions if bit
+	 * 31 = 0 then they are per ISA invalid forms, however P9 UM, in section
+	 * 4.6.10 Book II Invalid Forms, informs specifically that ignoring bit
+	 * 31 is an acceptable way to handle these invalid forms that have
+	 * bit 31 = 0. Moreover, for emulation purposes both forms (w/ and wo/
+	 * bit 31 set) can generate a softpatch interrupt. Hence both forms
+	 * are handled below for these instructions so they behave the same way.
+	 */
+	switch (instr & PO_XOP_OPCODE_MASK) {
+	case PPC_INST_RFID:
+		/* XXX do we need to check for PR=0 here? */
+		newmsr = vcpu->arch.shregs.srr1;
+		/* should only get here for Sx -> T1 transition */
+		WARN_ON_ONCE(!(MSR_TM_SUSPENDED(msr) &&
+			       MSR_TM_TRANSACTIONAL(newmsr) &&
+			       (newmsr & MSR_TM)));
+		newmsr = sanitize_msr(newmsr);
+		vcpu->arch.shregs.msr = newmsr;
+		vcpu->arch.cfar = vcpu->arch.regs.nip - 4;
+		vcpu->arch.regs.nip = vcpu->arch.shregs.srr0;
+		return RESUME_GUEST;
+
+	case PPC_INST_RFEBB:
+		if ((msr & MSR_PR) && (vcpu->arch.vcore->pcr & PCR_ARCH_206)) {
+			/* generate an illegal instruction interrupt */
+			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+			return RESUME_GUEST;
+		}
+		/* check EBB facility is available */
+		if (!(vcpu->arch.hfscr & HFSCR_EBB)) {
+			/* generate an illegal instruction interrupt */
+			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+			return RESUME_GUEST;
+		}
+		if ((msr & MSR_PR) && !(vcpu->arch.fscr & FSCR_EBB)) {
+			/* generate a facility unavailable interrupt */
+			vcpu->arch.fscr = (vcpu->arch.fscr & ~(0xffull << 56)) |
+				((u64)FSCR_EBB_LG << 56);
+			kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
+			return RESUME_GUEST;
+		}
+		bescr = vcpu->arch.bescr;
+		/* expect to see a S->T transition requested */
+		WARN_ON_ONCE(!(MSR_TM_SUSPENDED(msr) &&
+			       ((bescr >> 30) & 3) == 2));
+		bescr &= ~BESCR_GE;
+		if (instr & (1 << 11))
+			bescr |= BESCR_GE;
+		vcpu->arch.bescr = bescr;
+		msr = (msr & ~MSR_TS_MASK) | MSR_TS_T;
+		vcpu->arch.shregs.msr = msr;
+		vcpu->arch.cfar = vcpu->arch.regs.nip - 4;
+		vcpu->arch.regs.nip = vcpu->arch.ebbrr;
+		return RESUME_GUEST;
+
+	case PPC_INST_MTMSRD:
+		/* XXX do we need to check for PR=0 here? */
+		rs = (instr >> 21) & 0x1f;
+		newmsr = kvmppc_get_gpr(vcpu, rs);
+		/* check this is a Sx -> T1 transition */
+		WARN_ON_ONCE(!(MSR_TM_SUSPENDED(msr) &&
+			       MSR_TM_TRANSACTIONAL(newmsr) &&
+			       (newmsr & MSR_TM)));
+		/* mtmsrd doesn't change LE */
+		newmsr = (newmsr & ~MSR_LE) | (msr & MSR_LE);
+		newmsr = sanitize_msr(newmsr);
+		vcpu->arch.shregs.msr = newmsr;
+		return RESUME_GUEST;
+
+	/* ignore bit 31, see comment above */
+	case (PPC_INST_TSR & PO_XOP_OPCODE_MASK):
+		/* check for PR=1 and arch 2.06 bit set in PCR */
+		if ((msr & MSR_PR) && (vcpu->arch.vcore->pcr & PCR_ARCH_206)) {
+			/* generate an illegal instruction interrupt */
+			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+			return RESUME_GUEST;
+		}
+		/* check for TM disabled in the HFSCR or MSR */
+		if (!(vcpu->arch.hfscr & HFSCR_TM)) {
+			/* generate an illegal instruction interrupt */
+			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+			return RESUME_GUEST;
+		}
+		if (!(msr & MSR_TM)) {
+			/* generate a facility unavailable interrupt */
+			vcpu->arch.fscr = (vcpu->arch.fscr & ~(0xffull << 56)) |
+				((u64)FSCR_TM_LG << 56);
+			kvmppc_book3s_queue_irqprio(vcpu,
+						BOOK3S_INTERRUPT_FAC_UNAVAIL);
+			return RESUME_GUEST;
+		}
+		/* Set CR0 to indicate previous transactional state */
+		vcpu->arch.regs.ccr = (vcpu->arch.regs.ccr & 0x0fffffff) |
+			(((msr & MSR_TS_MASK) >> MSR_TS_S_LG) << 29);
+		/* L=1 => tresume, L=0 => tsuspend */
+		if (instr & (1 << 21)) {
+			if (MSR_TM_SUSPENDED(msr))
+				msr = (msr & ~MSR_TS_MASK) | MSR_TS_T;
+		} else {
+			if (MSR_TM_TRANSACTIONAL(msr))
+				msr = (msr & ~MSR_TS_MASK) | MSR_TS_S;
+		}
+		vcpu->arch.shregs.msr = msr;
+		return RESUME_GUEST;
+
+	/* ignore bit 31, see comment above */
+	case (PPC_INST_TRECLAIM & PO_XOP_OPCODE_MASK):
+		/* check for TM disabled in the HFSCR or MSR */
+		if (!(vcpu->arch.hfscr & HFSCR_TM)) {
+			/* generate an illegal instruction interrupt */
+			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+			return RESUME_GUEST;
+		}
+		if (!(msr & MSR_TM)) {
+			/* generate a facility unavailable interrupt */
+			vcpu->arch.fscr = (vcpu->arch.fscr & ~(0xffull << 56)) |
+				((u64)FSCR_TM_LG << 56);
+			kvmppc_book3s_queue_irqprio(vcpu,
+						BOOK3S_INTERRUPT_FAC_UNAVAIL);
+			return RESUME_GUEST;
+		}
+		/* If no transaction active, generate TM bad thing */
+		if (!MSR_TM_ACTIVE(msr)) {
+			kvmppc_core_queue_program(vcpu, SRR1_PROGTM);
+			return RESUME_GUEST;
+		}
+		/* If failure was not previously recorded, recompute TEXASR */
+		if (!(vcpu->arch.orig_texasr & TEXASR_FS)) {
+			ra = (instr >> 16) & 0x1f;
+			if (ra)
+				ra = kvmppc_get_gpr(vcpu, ra) & 0xff;
+			emulate_tx_failure(vcpu, ra);
+		}
+
+		copy_from_checkpoint(vcpu);
+
+		/* Set CR0 to indicate previous transactional state */
+		vcpu->arch.regs.ccr = (vcpu->arch.regs.ccr & 0x0fffffff) |
+			(((msr & MSR_TS_MASK) >> MSR_TS_S_LG) << 29);
+		vcpu->arch.shregs.msr &= ~MSR_TS_MASK;
+		return RESUME_GUEST;
+
+	/* ignore bit 31, see comment above */
+	case (PPC_INST_TRECHKPT & PO_XOP_OPCODE_MASK):
+		/* XXX do we need to check for PR=0 here? */
+		/* check for TM disabled in the HFSCR or MSR */
+		if (!(vcpu->arch.hfscr & HFSCR_TM)) {
+			/* generate an illegal instruction interrupt */
+			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+			return RESUME_GUEST;
+		}
+		if (!(msr & MSR_TM)) {
+			/* generate a facility unavailable interrupt */
+			vcpu->arch.fscr = (vcpu->arch.fscr & ~(0xffull << 56)) |
+				((u64)FSCR_TM_LG << 56);
+			kvmppc_book3s_queue_irqprio(vcpu,
+						BOOK3S_INTERRUPT_FAC_UNAVAIL);
+			return RESUME_GUEST;
+		}
+		/* If transaction active or TEXASR[FS] = 0, bad thing */
+		if (MSR_TM_ACTIVE(msr) || !(vcpu->arch.texasr & TEXASR_FS)) {
+			kvmppc_core_queue_program(vcpu, SRR1_PROGTM);
+			return RESUME_GUEST;
+		}
+
+		copy_to_checkpoint(vcpu);
+
+		/* Set CR0 to indicate previous transactional state */
+		vcpu->arch.regs.ccr = (vcpu->arch.regs.ccr & 0x0fffffff) |
+			(((msr & MSR_TS_MASK) >> MSR_TS_S_LG) << 29);
+		vcpu->arch.shregs.msr = msr | MSR_TS_S;
+		return RESUME_GUEST;
+	}
+
+	/* What should we do here? We didn't recognize the instruction */
+	kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
+	pr_warn_ratelimited("Unrecognized TM-related instruction %#x for emulation", instr);
+
+	return RESUME_GUEST;
+}