From: Alexandru Elisei <alexandru.elisei@arm.com>
To: Marc Zyngier <Marc.Zyngier@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Cc: Andre Przywara <Andre.Przywara@arm.com>,
Dave P Martin <Dave.Martin@arm.com>
Subject: Re: [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support
Date: Thu, 22 Aug 2019 16:32:59 +0100
Message-ID: <97b82b0d-57a4-cc63-8634-b2dff9e3614b@arm.com> (raw)
In-Reply-To: <55184c0d-8a8f-ca67-894c-1e738aee262b@arm.com>
On 8/22/19 12:57 PM, Alexandru Elisei wrote:
> [..]
> I tried to fix it with the following patch, inject_undef64 was similarly broken:
>
> diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
> index fac962b467bd..aee8a9ef36d5 100644
> --- a/arch/arm64/kvm/inject_fault.c
> +++ b/arch/arm64/kvm/inject_fault.c
> @@ -53,15 +53,7 @@ static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt,
> unsigned long addr
> {
> unsigned long cpsr = *vcpu_cpsr(vcpu);
> bool is_aarch32 = vcpu_mode_is_32bit(vcpu);
> - u32 esr = 0;
> -
> - vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
> - *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
> -
> - *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
> - vcpu_write_spsr(vcpu, cpsr);
> -
> - vcpu_write_sys_reg(vcpu, addr, FAR_EL1);
> + u32 esr = ESR_ELx_FSC_EXTABT;
>
> /*
> * Build an {i,d}abort, depending on the level and the
> @@ -82,13 +74,12 @@ static void inject_abt64(struct kvm_vcpu *vcpu, bool
> is_iabt, unsigned long addr
> if (!is_iabt)
> esr |= ESR_ELx_EC_DABT_LOW << ESR_ELx_EC_SHIFT;
>
> - vcpu_write_sys_reg(vcpu, esr | ESR_ELx_FSC_EXTABT, ESR_EL1);
> -}
> + if (nested_virt_in_use(vcpu)) {
> + kvm_inject_nested_sync(vcpu, esr);
> + return;
> + }
>
> -static void inject_undef64(struct kvm_vcpu *vcpu)
> -{
> - unsigned long cpsr = *vcpu_cpsr(vcpu);
> - u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
> + vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
>
> vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
> *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
> @@ -96,6 +87,14 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
> *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
> vcpu_write_spsr(vcpu, cpsr);
>
> + vcpu_write_sys_reg(vcpu, addr, FAR_EL1);
> +}
> +
> +static void inject_undef64(struct kvm_vcpu *vcpu)
> +{
> + unsigned long cpsr = *vcpu_cpsr(vcpu);
> + u32 esr = ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT;
> +
> /*
> * Build an unknown exception, depending on the instruction
> * set.
> @@ -103,7 +102,18 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
> if (kvm_vcpu_trap_il_is32bit(vcpu))
> esr |= ESR_ELx_IL;
>
> + if (nested_virt_in_use(vcpu)) {
> + kvm_inject_nested_sync(vcpu, esr);
> + return;
> + }
> +
> vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
> +
> + vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
> + *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
> +
> + *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
> + vcpu_write_spsr(vcpu, cpsr);
> }
>
> /**
>
Oops, the above is broken for anything running under a L1 guest hypervisor.
Hopefully this is better:
diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
index fac962b467bd..952e49aeb6f0 100644
--- a/arch/arm64/kvm/inject_fault.c
+++ b/arch/arm64/kvm/inject_fault.c
@@ -53,15 +53,7 @@ static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt,
unsigned long addr
{
unsigned long cpsr = *vcpu_cpsr(vcpu);
bool is_aarch32 = vcpu_mode_is_32bit(vcpu);
- u32 esr = 0;
-
- vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
- *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
-
- *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
- vcpu_write_spsr(vcpu, cpsr);
-
- vcpu_write_sys_reg(vcpu, addr, FAR_EL1);
+ u32 esr = ESR_ELx_FSC_EXTABT;
/*
* Build an {i,d}abort, depending on the level and the
@@ -82,13 +74,12 @@ static void inject_abt64(struct kvm_vcpu *vcpu, bool
is_iabt, unsigned long addr
if (!is_iabt)
esr |= ESR_ELx_EC_DABT_LOW << ESR_ELx_EC_SHIFT;
- vcpu_write_sys_reg(vcpu, esr | ESR_ELx_FSC_EXTABT, ESR_EL1);
-}
+ if (is_hyp_ctxt(vcpu)) {
+ kvm_inject_nested_sync(vcpu, esr);
+ return;
+ }
-static void inject_undef64(struct kvm_vcpu *vcpu)
-{
- unsigned long cpsr = *vcpu_cpsr(vcpu);
- u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
+ vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
*vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
@@ -96,6 +87,14 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
*vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
vcpu_write_spsr(vcpu, cpsr);
+ vcpu_write_sys_reg(vcpu, addr, FAR_EL1);
+}
+
+static void inject_undef64(struct kvm_vcpu *vcpu)
+{
+ unsigned long cpsr = *vcpu_cpsr(vcpu);
+ u32 esr = ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT;
+
/*
* Build an unknown exception, depending on the instruction
* set.
@@ -103,7 +102,18 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
if (kvm_vcpu_trap_il_is32bit(vcpu))
esr |= ESR_ELx_IL;
+ if (is_hyp_ctxt(vcpu)) {
+ kvm_inject_nested_sync(vcpu, esr);
+ return;
+ }
+
vcpu_write_sys_reg(vcpu, esr, ESR_EL1);
+
+ vcpu_write_elr_el1(vcpu, *vcpu_pc(vcpu));
+ *vcpu_pc(vcpu) = get_except_vector(vcpu, except_type_sync);
+
+ *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
+ vcpu_write_spsr(vcpu, cpsr);
}
/**
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Thread overview: 177+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-21 9:37 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
2019-07-18 12:36 ` Alexandru Elisei
2019-07-18 12:56 ` Alexandru Elisei
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 ` [PATCH 44/59] KVM: arm64: nv: Trap and emulate TLBI " Marc Zyngier
2019-07-02 12:37 ` 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
2019-06-21 9:57 ` [PATCH 00/59] KVM: arm64: ARMv8.3 Nested Virtualization support Itaru Kitayama
2019-06-21 11:21 ` 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 [this message]
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