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From: Marc Zyngier <marc.zyngier@arm.com>
To: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: Andre Przywara <andre.przywara@arm.com>,
	Christoffer Dall <christoffer.dall@arm.com>,
	Dave Martin <Dave.Martin@arm.com>,
	Jintack Lim <jintack@cs.columbia.edu>,
	Julien Thierry <julien.thierry@arm.com>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 44/59] KVM: arm64: nv: Trap and emulate TLBI instructions from virtual EL2
Date: Fri, 21 Jun 2019 10:38:28 +0100
Message-ID: <20190621093843.220980-45-marc.zyngier@arm.com> (raw)
In-Reply-To: <20190621093843.220980-1-marc.zyngier@arm.com>

From: Jintack Lim <jintack.lim@linaro.org>

When supporting nested virtualization a guest hypervisor executing TLBI
instructions must be trapped and emulated by the host hypervisor,
because the guest hypervisor can only affect physical TLB entries
relating to its own execution environment (virtual EL2 in EL1) but not
to the nested guests as required by the semantics of the instructions
and TLBI instructions might also result in updates (invalidations) to
shadow page tables.

This patch does several things.

1. List and define all TLBI system instructions to emulate.

2. Emulate TLBI ALLE2(IS) instruction executed in the virtual EL2. Since
we emulate the virtual EL2 in the EL1, we invalidate EL1&0 regime stage
1 TLB entries with setting vttbr_el2 having the VMID of the virtual EL2.

3. Emulate TLBI VAE2* instruction executed in the virtual EL2. Based on the
same principle as TLBI ALLE2 instruction, we can simply emulate those
instructions by executing corresponding VAE1* instructions with the
virtual EL2's VMID assigned by the host hypervisor.

Note that we are able to emulate TLBI ALLE2IS precisely by only
invalidating stage 1 TLB entries via TLBI VMALL1IS instruction, but to
make it simeple, we reuse the existing function, __kvm_tlb_flush_vmid(),
which invalidates both of stage 1 and 2 TLB entries.

4. TLBI ALLE1(IS) instruction invalidates all EL1&0 regime stage 1 and 2
TLB entries (on all PEs in the same Inner Shareable domain). To emulate
these instructions, we first need to clear all the mappings in the
shadow page tables since executing those instructions implies the change
of mappings in the stage 2 page tables maintained by the guest
hypervisor.  We then need to invalidate all EL1&0 regime stage 1 and 2
TLB entries of all VMIDs, which are assigned by the host hypervisor, for
this VM.

5. Based on the same principle as TLBI ALLE1(IS) emulation, we clear the
mappings in the shadow stage-2 page tables and invalidate TLB entries.
But this time we do it only for the current VMID from the guest
hypervisor's perspective, not for all VMIDs.

6. Based on the same principle as TLBI ALLE1(IS) and TLBI VMALLS12E1(IS)
emulation, we clear the mappings in the shadow stage-2 page tables and
invalidate TLB entries. We do it only for one mapping for the current
VMID from the guest hypervisor's view.

7. Forward system instruction traps to the virtual EL2 if a
corresponding bit in the virtual HCR_EL2 is set.

8. Even though a guest hypervisor can execute TLBI instructions that are
accesible at EL1 without trap, it's wrong; All those TLBI instructions
work based on current VMID, and when running a guest hypervisor current
VMID is the one for itself, not the one from the virtual vttbr_el2. So
letting a guest hypervisor execute those TLBI instructions results in
invalidating its own TLB entries and leaving invalid TLB entries
unhandled.

Therefore we trap and emulate those TLBI instructions. The emulation is
simple; we find a shadow VMID mapped to the virtual vttbr_el2, set it in
the physical vttbr_el2, then execute the same instruction in EL2.

We don't set HCR_EL2.TTLB bit yet.

  [ Changes performed by Marc Zynger:

    The TLBI handling code more or less directly execute the same
    instruction that has been trapped (with an EL2->EL1 conversion
    in the case of an EL2 TLBI), but that's unfortunately not enough:

    - TLBIs must be upgraded to the Inner Shareable domain to account
      for vcpu migration, just like we already have with HCR_EL2.FB.

    - The DSB instruction that synchronises these must thus be on
      the Inner Shareable domain as well.

    - Prior to executing the TLBI, we need another DSB ISHST to make
      sure that the update to the page tables is now visible.

      Ordering of system instructions fixed

    - The current TLB invalidation code is pretty buggy, as it assume a
      page mapping. On the contrary, it is likely that TLB invalidation
      will cover more than a single page, and the size should be decided
      by the guests configuration (and not the host's).

      Since we don't cache the guest mapping sizes in the shadow PT yet,
      let's assume the worse case (a block mapping) and invalidate that.

      Take this opportunity to fix the decoding of the parameter (it
      isn't a straight IPA).

    - In general, we always emulate local TBL invalidations as being
      as upgraded to the Inner Shareable domain so that we can easily
      deal with vcpu migration. This is consistent with the fact that
      we set HCR_EL2.FB when running non-nested VMs.

      So let's emulate TLBI ALLE2 as ALLE2IS.
  ]

  [ Changes performed by Christoffer Dall:

    Sometimes when we are invalidating the TLB for a certain S2 MMU
    context, this context can also have EL2 context associated with it
    and we have to invalidate this too.
  ]

Signed-off-by: Jintack Lim <jintack.lim@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
---
 arch/arm64/include/asm/kvm_asm.h |   2 +
 arch/arm64/include/asm/sysreg.h  |  36 ++++++
 arch/arm64/kvm/hyp/tlb.c         |  81 +++++++++++++
 arch/arm64/kvm/sys_regs.c        | 201 +++++++++++++++++++++++++++++++
 virt/kvm/arm/mmu.c               |  18 ++-
 5 files changed, 337 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 1cfa4d2cf772..9cb9ab066ebc 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -67,6 +67,8 @@ extern void __kvm_flush_vm_context(void);
 extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa);
 extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
 extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
+extern void __kvm_tlb_vae2(struct kvm_s2_mmu *mmu, u64 va, u64 sys_encoding);
+extern void __kvm_tlb_el1_instr(struct kvm_s2_mmu *mmu, u64 val, u64 sys_encoding);
 
 extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
 extern void __kvm_at_s1e01(struct kvm_vcpu *vcpu, u32 op, u64 vaddr);
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index b3a8d21c07b3..e0912ececd92 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -553,6 +553,42 @@
 #define OP_AT_S12E0R	sys_insn(AT_Op0, 4, AT_CRn, 8, 6)
 #define OP_AT_S12E0W	sys_insn(AT_Op0, 4, AT_CRn, 8, 7)
 
+/* TLBI instructions */
+#define TLBI_Op0	1
+#define TLBI_Op1_EL1	0	/* Accessible from EL1 or higher */
+#define TLBI_Op1_EL2	4	/* Accessible from EL2 or higher */
+#define TLBI_CRn	8
+#define tlbi_insn_el1(CRm, Op2)	sys_insn(TLBI_Op0, TLBI_Op1_EL1, TLBI_CRn, (CRm), (Op2))
+#define tlbi_insn_el2(CRm, Op2)	sys_insn(TLBI_Op0, TLBI_Op1_EL2, TLBI_CRn, (CRm), (Op2))
+
+#define OP_TLBI_VMALLE1IS	tlbi_insn_el1(3, 0)
+#define OP_TLBI_VAE1IS		tlbi_insn_el1(3, 1)
+#define OP_TLBI_ASIDE1IS	tlbi_insn_el1(3, 2)
+#define OP_TLBI_VAAE1IS		tlbi_insn_el1(3, 3)
+#define OP_TLBI_VALE1IS		tlbi_insn_el1(3, 5)
+#define OP_TLBI_VAALE1IS	tlbi_insn_el1(3, 7)
+#define OP_TLBI_VMALLE1		tlbi_insn_el1(7, 0)
+#define OP_TLBI_VAE1		tlbi_insn_el1(7, 1)
+#define OP_TLBI_ASIDE1		tlbi_insn_el1(7, 2)
+#define OP_TLBI_VAAE1		tlbi_insn_el1(7, 3)
+#define OP_TLBI_VALE1		tlbi_insn_el1(7, 5)
+#define OP_TLBI_VAALE1		tlbi_insn_el1(7, 7)
+
+#define OP_TLBI_IPAS2E1IS	tlbi_insn_el2(0, 1)
+#define OP_TLBI_IPAS2LE1IS	tlbi_insn_el2(0, 5)
+#define OP_TLBI_ALLE2IS		tlbi_insn_el2(3, 0)
+#define OP_TLBI_VAE2IS		tlbi_insn_el2(3, 1)
+#define OP_TLBI_ALLE1IS		tlbi_insn_el2(3, 4)
+#define OP_TLBI_VALE2IS		tlbi_insn_el2(3, 5)
+#define OP_TLBI_VMALLS12E1IS	tlbi_insn_el2(3, 6)
+#define OP_TLBI_IPAS2E1		tlbi_insn_el2(4, 1)
+#define OP_TLBI_IPAS2LE1	tlbi_insn_el2(4, 5)
+#define OP_TLBI_ALLE2		tlbi_insn_el2(7, 0)
+#define OP_TLBI_VAE2		tlbi_insn_el2(7, 1)
+#define OP_TLBI_ALLE1		tlbi_insn_el2(7, 4)
+#define OP_TLBI_VALE2		tlbi_insn_el2(7, 5)
+#define OP_TLBI_VMALLS12E1	tlbi_insn_el2(7, 6)
+
 /* Common SCTLR_ELx flags. */
 #define SCTLR_ELx_DSSBS	(_BITUL(44))
 #define SCTLR_ELx_ENIA	(_BITUL(31))
diff --git a/arch/arm64/kvm/hyp/tlb.c b/arch/arm64/kvm/hyp/tlb.c
index 779405db3fb3..026afbf1a697 100644
--- a/arch/arm64/kvm/hyp/tlb.c
+++ b/arch/arm64/kvm/hyp/tlb.c
@@ -205,3 +205,84 @@ void __hyp_text __kvm_flush_vm_context(void)
 	asm volatile("ic ialluis" : : );
 	dsb(ish);
 }
+
+void __hyp_text __kvm_tlb_vae2(struct kvm_s2_mmu *mmu, u64 va, u64 sys_encoding)
+{
+	struct tlb_inv_context cxt;
+
+	dsb(ishst);
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest()(mmu, &cxt);
+
+	/*
+	 * Execute the EL1 version of TLBI VAE2* instruction, forcing
+	 * an upgrade to the Inner Shareable domain in order to
+	 * perform the invalidation on all CPUs.
+	 */
+	switch (sys_encoding) {
+	case OP_TLBI_VAE2:
+	case OP_TLBI_VAE2IS:
+		__tlbi(vae1is, va);
+		break;
+	case OP_TLBI_VALE2:
+	case OP_TLBI_VALE2IS:
+		__tlbi(vale1is, va);
+		break;
+	default:
+		break;
+	}
+	dsb(ish);
+	isb();
+
+	__tlb_switch_to_host()(&cxt);
+}
+
+void __hyp_text __kvm_tlb_el1_instr(struct kvm_s2_mmu *mmu, u64 val, u64 sys_encoding)
+{
+	struct tlb_inv_context cxt;
+
+	dsb(ishst);
+
+	/* Switch to requested VMID */
+	__tlb_switch_to_guest()(mmu, &cxt);
+
+	/*
+	 * Execute the same instruction as the guest hypervisor did,
+	 * expanding the scope of local TLB invalidations to the Inner
+	 * Shareable domain so that it takes place on all CPUs. This
+	 * is equivalent to having HCR_EL2.FB set.
+	 */
+	switch (sys_encoding) {
+	case OP_TLBI_VMALLE1:
+	case OP_TLBI_VMALLE1IS:
+		__tlbi(vmalle1is);
+		break;
+	case OP_TLBI_VAE1:
+	case OP_TLBI_VAE1IS:
+		__tlbi(vae1is, val);
+		break;
+	case OP_TLBI_ASIDE1:
+	case OP_TLBI_ASIDE1IS:
+		__tlbi(aside1is, val);
+		break;
+	case OP_TLBI_VAAE1:
+	case OP_TLBI_VAAE1IS:
+		__tlbi(vaae1is, val);
+		break;
+	case OP_TLBI_VALE1:
+	case OP_TLBI_VALE1IS:
+		__tlbi(vale1is, val);
+		break;
+	case OP_TLBI_VAALE1:
+	case OP_TLBI_VAALE1IS:
+		__tlbi(vaale1is, val);
+		break;
+	default:
+		break;
+	}
+	dsb(ish);
+	isb();
+
+	__tlb_switch_to_host()(&cxt);
+}
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 102419b837e8..0343682fe47f 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1661,6 +1661,11 @@ static bool forward_at_traps(struct kvm_vcpu *vcpu)
 	return forward_traps(vcpu, HCR_AT);
 }
 
+static bool forward_ttlb_traps(struct kvm_vcpu *vcpu)
+{
+	return forward_traps(vcpu, HCR_TTLB);
+}
+
 /* This function is to support the recursive nested virtualization */
 static bool forward_nv1_traps(struct kvm_vcpu *vcpu, struct sys_reg_params *p)
 {
@@ -2251,6 +2256,174 @@ static bool handle_s12w(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 	return handle_s12(vcpu, p, r, true);
 }
 
+static bool handle_alle2is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	/*
+	 * To emulate invalidating all EL2 regime stage 1 TLB entries for all
+	 * PEs, executing TLBI VMALLE1IS is enough. But reuse the existing
+	 * interface for the simplicity; invalidating stage 2 entries doesn't
+	 * affect the correctness.
+	 */
+	kvm_call_hyp(__kvm_tlb_flush_vmid, &vcpu->kvm->arch.mmu);
+	return true;
+}
+
+static bool handle_vae2(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+		       const struct sys_reg_desc *r)
+{
+	int sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2);
+
+	/*
+	 * Based on the same principle as TLBI ALLE2 instruction emulation, we
+	 * emulate TLBI VAE2* instructions by executing corresponding TLBI VAE1*
+	 * instructions with the virtual EL2's VMID assigned by the host
+	 * hypervisor.
+	 */
+	kvm_call_hyp(__kvm_tlb_vae2, &vcpu->kvm->arch.mmu,
+		     p->regval, sys_encoding);
+	return true;
+}
+
+static bool handle_alle1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	struct kvm_s2_mmu *mmu = &vcpu->kvm->arch.mmu;
+	spin_lock(&vcpu->kvm->mmu_lock);
+
+	/*
+	 * Clear all mappings in the shadow page tables and invalidate the stage
+	 * 1 and 2 TLB entries via kvm_tlb_flush_vmid_ipa().
+	 */
+	kvm_nested_s2_clear(vcpu->kvm);
+
+	if (mmu->vmid.vmid_gen) {
+		/*
+		 * Invalidate the stage 1 and 2 TLB entries for the host OS
+		 * in a VM only if there is one.
+		 */
+		kvm_call_hyp(__kvm_tlb_flush_vmid, mmu);
+	}
+
+	spin_unlock(&vcpu->kvm->mmu_lock);
+
+	return true;
+}
+
+static bool handle_vmalls12e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+				const struct sys_reg_desc *r)
+{
+	u64 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2);
+	struct kvm_s2_mmu *mmu;
+
+	spin_lock(&vcpu->kvm->mmu_lock);
+
+	mmu = lookup_s2_mmu(vcpu->kvm, vttbr, HCR_VM);
+	if (mmu)
+		kvm_unmap_stage2_range(mmu, 0, kvm_phys_size(vcpu->kvm));
+
+	mmu = lookup_s2_mmu(vcpu->kvm, vttbr, 0);
+	if (mmu)
+		kvm_unmap_stage2_range(mmu, 0, kvm_phys_size(vcpu->kvm));
+
+	spin_unlock(&vcpu->kvm->mmu_lock);
+
+	return true;
+}
+
+static bool handle_ipas2e1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			     const struct sys_reg_desc *r)
+{
+	u64 vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2);
+	u64 vtcr = vcpu_read_sys_reg(vcpu, VTCR_EL2);
+	struct kvm_s2_mmu *mmu;
+	u64 base_addr;
+	int max_size;
+
+	/*
+	 * We drop a number of things from the supplied value:
+	 *
+	 * - NS bit: we're non-secure only.
+	 *
+	 * - TTL field: We already have the granule size from the
+	 *   VTCR_EL2.TG0 field, and the level is only relevant to the
+	 *   guest's S2PT.
+	 *
+	 * - IPA[51:48]: We don't support 52bit IPA just yet...
+	 *
+	 * And of course, adjust the IPA to be on an actual address.
+	 */
+	base_addr = (p->regval & GENMASK_ULL(35, 0)) << 12;
+
+	/* Compute the maximum extent of the invalidation */
+	switch ((vtcr & VTCR_EL2_TG0_MASK)) {
+	case VTCR_EL2_TG0_4K:
+		max_size = SZ_1G;
+		break;
+	case VTCR_EL2_TG0_16K:
+		max_size = SZ_32M;
+		break;
+	case VTCR_EL2_TG0_64K:
+		/*
+		 * No, we do not support 52bit IPA in nested yet. Once
+		 * we do, this should be 4TB.
+		 */
+		/* FIXME: remove the 52bit PA support from the IDregs */
+		max_size = SZ_512M;
+		break;
+	default:
+		BUG();
+	}
+
+	spin_lock(&vcpu->kvm->mmu_lock);
+
+	mmu = lookup_s2_mmu(vcpu->kvm, vttbr, HCR_VM);
+	if (mmu)
+		kvm_unmap_stage2_range(mmu, base_addr, max_size);
+
+	mmu = lookup_s2_mmu(vcpu->kvm, vttbr, 0);
+	if (mmu)
+		kvm_unmap_stage2_range(mmu, base_addr, max_size);
+
+	spin_unlock(&vcpu->kvm->mmu_lock);
+
+	return true;
+}
+
+static bool handle_tlbi_el1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	u64 virtual_vttbr = vcpu_read_sys_reg(vcpu, VTTBR_EL2);
+	struct kvm_s2_mmu *mmu;
+	int sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2);
+
+	/*
+	 * TODO: Revisit this comment:
+	 *
+	 * If we can't find a shadow VMID, it is either the virtual
+	 * VMID is for the host OS or the nested VM having the virtual
+	 * VMID is never executed. (Note that we create a showdow VMID
+	 * when entering a VM.) For the former, we can flush TLB
+	 * entries belonging to the host OS in a VM. For the latter, we
+	 * don't have to do anything. Since we can't differentiate
+	 * between those cases, just do what we can do for the former.
+	 */
+
+	mutex_lock(&vcpu->kvm->lock);
+	mmu = lookup_s2_mmu(vcpu->kvm, virtual_vttbr, HCR_VM);
+	if (mmu)
+		kvm_call_hyp(__kvm_tlb_el1_instr,
+			     mmu, p->regval, sys_encoding);
+
+	mmu = lookup_s2_mmu(vcpu->kvm, virtual_vttbr, 0);
+	if (mmu)
+		kvm_call_hyp(__kvm_tlb_el1_instr,
+			     mmu, p->regval, sys_encoding);
+	mutex_unlock(&vcpu->kvm->lock);
+
+	return true;
+}
+
 /*
  * AT instruction emulation
  *
@@ -2333,12 +2506,40 @@ static struct sys_reg_desc sys_insn_descs[] = {
 	{ SYS_DESC(SYS_DC_CSW), access_dcsw },
 	{ SYS_DESC(SYS_DC_CISW), access_dcsw },
 
+	SYS_INSN_TO_DESC(TLBI_VMALLE1IS, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VAE1IS, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_ASIDE1IS, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VAAE1IS, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VALE1IS, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VAALE1IS, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VMALLE1, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VAE1, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_ASIDE1, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VAAE1, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VALE1, handle_tlbi_el1, forward_ttlb_traps),
+	SYS_INSN_TO_DESC(TLBI_VAALE1, handle_tlbi_el1, forward_ttlb_traps),
+
 	SYS_INSN_TO_DESC(AT_S1E2R, handle_s1e2, forward_nv_traps),
 	SYS_INSN_TO_DESC(AT_S1E2W, handle_s1e2, forward_nv_traps),
 	SYS_INSN_TO_DESC(AT_S12E1R, handle_s12r, forward_nv_traps),
 	SYS_INSN_TO_DESC(AT_S12E1W, handle_s12w, forward_nv_traps),
 	SYS_INSN_TO_DESC(AT_S12E0R, handle_s12r, forward_nv_traps),
 	SYS_INSN_TO_DESC(AT_S12E0W, handle_s12w, forward_nv_traps),
+
+	SYS_INSN_TO_DESC(TLBI_IPAS2E1IS, handle_ipas2e1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_IPAS2LE1IS, handle_ipas2e1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_ALLE2IS, handle_alle2is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_VAE2IS, handle_vae2, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_ALLE1IS, handle_alle1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_VALE2IS, handle_vae2, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_VMALLS12E1IS, handle_vmalls12e1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_IPAS2E1, handle_ipas2e1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_IPAS2LE1, handle_ipas2e1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_ALLE2, handle_alle2is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_VAE2, handle_vae2, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_ALLE1, handle_alle1is, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_VALE2, handle_vae2, forward_nv_traps),
+	SYS_INSN_TO_DESC(TLBI_VMALLS12E1, handle_vmalls12e1is, forward_nv_traps),
 };
 
 static bool trap_dbgidr(struct kvm_vcpu *vcpu,
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 6a7cba077bce..0ea79e543b29 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -51,7 +51,23 @@ static bool memslot_is_logging(struct kvm_memory_slot *memslot)
  */
 void kvm_flush_remote_tlbs(struct kvm *kvm)
 {
-	kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
+	struct kvm_s2_mmu *mmu = &kvm->arch.mmu;
+
+	if (mmu == &kvm->arch.mmu) {
+		/*
+		 * For a normal (i.e. non-nested) guest, flush entries for the
+		 * given VMID *
+		 */
+		kvm_call_hyp(__kvm_tlb_flush_vmid, mmu);
+	} else {
+		/*
+		 * When supporting nested virtualization, we can have multiple
+		 * VMIDs in play for each VCPU in the VM, so it's really not
+		 * worth it to try to quiesce the system and flush all the
+		 * VMIDs that may be in use, instead just nuke the whole thing.
+		 */
+		kvm_call_hyp(__kvm_flush_vm_context);
+	}
 }
 
 static void kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa)
-- 
2.20.1


  parent reply index

Thread overview: 174+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-21  9:37 [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support Marc Zyngier
2019-06-21  9:37 ` [PATCH 01/59] KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s Marc Zyngier
2019-06-24 11:16   ` Dave Martin
2019-06-24 12:59   ` Alexandru Elisei
2019-07-03 12:32     ` Marc Zyngier
2019-06-21  9:37 ` [PATCH 02/59] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h Marc Zyngier
2019-06-24 11:19   ` Dave Martin
2019-07-03  9:30     ` Marc Zyngier
2019-07-03 16:13       ` Dave Martin
2019-06-21  9:37 ` [PATCH 03/59] arm64: Add ARM64_HAS_NESTED_VIRT cpufeature Marc Zyngier
2019-06-21 13:08   ` Julien Thierry
2019-06-21 13:22     ` Marc Zyngier
2019-06-21 13:44   ` Suzuki K Poulose
2019-06-24 11:24   ` Dave Martin
2019-06-21  9:37 ` [PATCH 04/59] KVM: arm64: nv: Introduce nested virtualization VCPU feature Marc Zyngier
2019-06-21 13:08   ` Julien Thierry
2019-06-24 11:28   ` Dave Martin
2019-07-03 11:53     ` Marc Zyngier
2019-07-03 16:27       ` Dave Martin
2019-06-24 11:43   ` Dave Martin
2019-07-03 11:56     ` Marc Zyngier
2019-07-03 16:24       ` Dave Martin
2019-06-21  9:37 ` [PATCH 05/59] KVM: arm64: nv: Reset VCPU to EL2 registers if VCPU nested virt is set Marc Zyngier
2019-06-24 10:19   ` Suzuki K Poulose
2019-06-24 11:38   ` Dave Martin
2019-06-21  9:37 ` [PATCH 06/59] KVM: arm64: nv: Allow userspace to set PSR_MODE_EL2x Marc Zyngier
2019-06-21 13:24   ` Julien Thierry
2019-06-21 13:50     ` Marc Zyngier
2019-06-24 12:48       ` Dave Martin
2019-07-03  9:21         ` Marc Zyngier
2019-07-04 10:00           ` Dave Martin
2019-06-21  9:37 ` [PATCH 07/59] KVM: arm64: nv: Add EL2 system registers to vcpu context Marc Zyngier
2019-06-24 12:54   ` Dave Martin
2019-07-03 12:20     ` Marc Zyngier
2019-07-03 16:31       ` Dave Martin
2019-06-24 15:47   ` Alexandru Elisei
2019-07-03 13:20     ` Marc Zyngier
2019-07-03 16:01       ` Marc Zyngier
2019-07-01 16:36   ` Suzuki K Poulose
2019-06-21  9:37 ` [PATCH 08/59] KVM: arm64: nv: Reset VMPIDR_EL2 and VPIDR_EL2 to sane values Marc Zyngier
2019-06-24 12:59   ` Dave Martin
2019-06-21  9:37 ` [PATCH 09/59] KVM: arm64: nv: Add nested virt VCPU primitives for vEL2 VCPU state Marc Zyngier
2019-06-24 13:08   ` Dave Martin
2019-06-21  9:37 ` [PATCH 10/59] KVM: arm64: nv: Support virtual EL2 exceptions Marc Zyngier
2019-07-08 13:56   ` Steven Price
2019-06-21  9:37 ` [PATCH 11/59] KVM: arm64: nv: Inject HVC exceptions to the virtual EL2 Marc Zyngier
2019-06-25 13:13   ` Alexandru Elisei
2019-07-03 14:16     ` Marc Zyngier
2019-07-30 14:08     ` Alexandru Elisei
2019-06-21  9:37 ` [PATCH 12/59] KVM: arm64: nv: Handle trapped ERET from " Marc Zyngier
2019-07-02 12:00   ` Alexandru Elisei
2019-06-21  9:37 ` [PATCH 13/59] KVM: arm64: nv: Handle virtual EL2 registers in vcpu_read/write_sys_reg() Marc Zyngier
2019-06-24 12:42   ` Julien Thierry
2019-06-25 14:02     ` Alexandru Elisei
2019-07-03 12:15     ` Marc Zyngier
2019-07-03 15:21       ` Julien Thierry
2019-06-25 15:18   ` Alexandru Elisei
2019-07-01  9:58     ` Alexandru Elisei
2019-07-03 15:59     ` Marc Zyngier
2019-07-03 16:32       ` Alexandru Elisei
2019-07-04 14:39         ` Marc Zyngier
2019-06-26 15:04   ` Alexandru Elisei
2019-07-04 15:05     ` Marc Zyngier
2019-07-01 12:10   ` Alexandru Elisei
2019-06-21  9:37 ` [PATCH 14/59] KVM: arm64: nv: Handle SPSR_EL2 specially Marc Zyngier
2019-06-21  9:37 ` [PATCH 15/59] KVM: arm64: nv: Refactor vcpu_{read,write}_sys_reg Marc Zyngier
2019-06-24 15:07   ` Julien Thierry
2019-07-03 13:09     ` Marc Zyngier
2019-06-27  9:21   ` Alexandru Elisei
2019-07-04 15:15     ` Marc Zyngier
2019-06-21  9:38 ` [PATCH 16/59] KVM: arm64: nv: Save/Restore vEL2 sysregs Marc Zyngier
2019-06-25  8:48   ` Julien Thierry
2019-07-03 13:42     ` Marc Zyngier
2019-07-01 12:09   ` Alexandru Elisei
2019-08-21 11:57   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 17/59] KVM: arm64: nv: Emulate PSTATE.M for a guest hypervisor Marc Zyngier
2019-06-21  9:38 ` [PATCH 18/59] KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2 Marc Zyngier
2019-07-01 16:12   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 19/59] KVM: arm64: nv: Trap SPSR_EL1, ELR_EL1 and VBAR_EL1 from " Marc Zyngier
2019-06-21  9:38 ` [PATCH 20/59] KVM: arm64: nv: Trap CPACR_EL1 access in " Marc Zyngier
2019-07-01 16:40   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 21/59] KVM: arm64: nv: Set a handler for the system instruction traps Marc Zyngier
2019-06-25 12:55   ` Julien Thierry
2019-07-03 14:15     ` Marc Zyngier
2019-06-21  9:38 ` [PATCH 22/59] KVM: arm64: nv: Handle PSCI call via smc from the guest Marc Zyngier
2019-06-21  9:38 ` [PATCH 23/59] KVM: arm64: nv: Respect virtual HCR_EL2.TWX setting Marc Zyngier
2019-06-25 14:19   ` Julien Thierry
2019-07-02 12:54     ` Alexandru Elisei
2019-07-03 14:18     ` Marc Zyngier
2019-06-21  9:38 ` [PATCH 24/59] KVM: arm64: nv: Respect virtual CPTR_EL2.TFP setting Marc Zyngier
2019-06-21  9:38 ` [PATCH 25/59] KVM: arm64: nv: Don't expose SVE to nested guests Marc Zyngier
2019-06-21  9:38 ` [PATCH 26/59] KVM: arm64: nv: Respect the virtual HCR_EL2.NV bit setting Marc Zyngier
2019-06-26  5:31   ` Julien Thierry
2019-07-03 16:31     ` Marc Zyngier
2019-06-21  9:38 ` [PATCH 27/59] KVM: arm64: nv: Respect virtual HCR_EL2.TVM and TRVM settings Marc Zyngier
2019-06-26  6:55   ` Julien Thierry
2019-07-04 14:57     ` Marc Zyngier
2019-06-21  9:38 ` [PATCH 28/59] KVM: arm64: nv: Respect the virtual HCR_EL2.NV1 bit setting Marc Zyngier
2019-06-26  7:23   ` Julien Thierry
2019-07-02 16:32   ` Alexandru Elisei
2019-07-03  9:10     ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 29/59] KVM: arm64: nv: Emulate EL12 register accesses from the virtual EL2 Marc Zyngier
2019-07-03  9:16   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 30/59] KVM: arm64: nv: Configure HCR_EL2 for nested virtualization Marc Zyngier
2019-06-21  9:38 ` [PATCH 31/59] KVM: arm64: nv: Only toggle cache for virtual EL2 when SCTLR_EL2 changes Marc Zyngier
2019-06-21  9:38 ` [PATCH 32/59] KVM: arm64: nv: Hide RAS from nested guests Marc Zyngier
2019-07-03 13:59   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 33/59] KVM: arm64: nv: Pretend we only support larger-than-host page sizes Marc Zyngier
2019-07-03 14:13   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 34/59] KVM: arm/arm64: nv: Factor out stage 2 page table data from struct kvm Marc Zyngier
2019-07-03 15:52   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 35/59] KVM: arm/arm64: nv: Support multiple nested stage 2 mmu structures Marc Zyngier
2019-06-25 12:19   ` Alexandru Elisei
2019-07-03 13:47     ` Marc Zyngier
2019-06-27 13:15   ` Julien Thierry
2019-07-04 15:51   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 36/59] KVM: arm64: nv: Implement nested Stage-2 page table walk logic Marc Zyngier
2019-06-21  9:38 ` [PATCH 37/59] KVM: arm64: nv: Handle shadow stage 2 page faults Marc Zyngier
2019-07-05 14:28   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 38/59] KVM: arm64: nv: Unmap/flush shadow stage 2 page tables Marc Zyngier
2019-07-01  8:03   ` Julien Thierry
2019-06-21  9:38 ` [PATCH 39/59] KVM: arm64: nv: Move last_vcpu_ran to be per s2 mmu Marc Zyngier
2019-07-01  9:10   ` Julien Thierry
2019-07-05 15:28   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 40/59] KVM: arm64: nv: Don't always start an S2 MMU search from the beginning Marc Zyngier
2019-07-09  9:59   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 41/59] KVM: arm64: nv: Introduce sys_reg_desc.forward_trap Marc Zyngier
2019-06-21  9:38 ` [PATCH 42/59] KVM: arm64: nv: Rework the system instruction emulation framework Marc Zyngier
2019-06-21  9:38 ` [PATCH 43/59] KVM: arm64: nv: Trap and emulate AT instructions from virtual EL2 Marc Zyngier
2019-07-01 15:45   ` Julien Thierry
2019-07-09 13:20   ` Alexandru Elisei
2019-07-18 12:13     ` Tomasz Nowicki
     [not found]       ` <6537c8d2-3bda-788e-8861-b70971a625cb@arm.com>
2019-07-18 12:59         ` Tomasz Nowicki
2019-07-24 10:25   ` Tomasz Nowicki
2019-07-24 12:39     ` Marc Zyngier
2019-07-24 13:56       ` Tomasz Nowicki
2019-06-21  9:38 ` Marc Zyngier [this message]
2019-07-02 12:37   ` [PATCH 44/59] KVM: arm64: nv: Trap and emulate TLBI " Julien Thierry
2019-07-10 10:15   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 45/59] KVM: arm64: nv: Handle traps for timer _EL02 and _EL2 sysregs accessors Marc Zyngier
2019-06-21  9:38 ` [PATCH 46/59] KVM: arm64: nv: arch_timer: Support hyp timer emulation Marc Zyngier
2019-07-10 16:23   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 47/59] KVM: arm64: nv: Propagate CNTVOFF_EL2 to the virtual EL1 timer Marc Zyngier
2019-08-08  9:34   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 48/59] KVM: arm64: nv: Load timer before the GIC Marc Zyngier
2019-07-11 13:17   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 49/59] KVM: arm64: nv: vgic-v3: Take cpu_if pointer directly instead of vcpu Marc Zyngier
2019-06-21  9:38 ` [PATCH 50/59] KVM: arm64: nv: Nested GICv3 Support Marc Zyngier
2019-07-16 11:41   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 51/59] KVM: arm64: nv: vgic: Emulate the HW bit in software Marc Zyngier
2019-06-21  9:38 ` [PATCH 52/59] KVM: arm64: nv: vgic: Allow userland to set VGIC maintenance IRQ Marc Zyngier
2019-07-04  7:38   ` Julien Thierry
2019-07-04  9:01     ` Andre Przywara
2019-07-04  9:04       ` Julien Thierry
2019-06-21  9:38 ` [PATCH 53/59] KVM: arm64: nv: Implement maintenance interrupt forwarding Marc Zyngier
2019-07-04  8:06   ` Julien Thierry
2019-07-16 16:35   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 54/59] KVM: arm64: nv: Add nested GICv3 tracepoints Marc Zyngier
2019-06-21  9:38 ` [PATCH 55/59] arm64: KVM: nv: Add handling of EL2-specific timer registers Marc Zyngier
2019-07-11 12:35   ` Alexandru Elisei
2019-07-17 10:19   ` Alexandru Elisei
2019-06-21  9:38 ` [PATCH 56/59] arm64: KVM: nv: Honor SCTLR_EL2.SPAN on entering vEL2 Marc Zyngier
2019-06-21  9:38 ` [PATCH 57/59] arm64: KVM: nv: Handle SCTLR_EL2 RES0/RES1 bits Marc Zyngier
2019-06-21  9:38 ` [PATCH 58/59] arm64: KVM: nv: Restrict S2 RD/WR permissions to match the guest's Marc Zyngier
2019-06-21  9:38 ` [PATCH 59/59] arm64: KVM: nv: Allow userspace to request KVM_ARM_VCPU_NESTED_VIRT Marc Zyngier
     [not found] ` <CANW9uyssDm_0ysC_pnvhHRrnsmFZik+3_ENmFz7L2GCmtH09fw@mail.gmail.com>
2019-06-21 11:21   ` [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support Marc Zyngier
2019-08-02 10:11 ` Alexandru Elisei
2019-08-02 10:30   ` Andrew Jones
2019-08-09 10:01   ` Alexandru Elisei
2019-08-09 11:44     ` Andrew Jones
2019-08-09 12:00       ` Alexandru Elisei
2019-08-09 13:00         ` Andrew Jones
2019-08-22 11:57     ` Alexandru Elisei
2019-08-22 15:32       ` Alexandru Elisei

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