From: Maxim Levitsky <mlevitsk@redhat.com>
To: Nicolas Saenz Julienne <nsaenz@amazon.com>, kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com,
anelkz@amazon.com, graf@amazon.com, dwmw@amazon.co.uk,
jgowans@amazon.com, corbert@lwn.net, kys@microsoft.com,
haiyangz@microsoft.com, decui@microsoft.com, x86@kernel.org,
linux-doc@vger.kernel.org
Subject: Re: [RFC 16/33] KVM: x86/mmu: Expose R/W/X flags during memory fault exits
Date: Tue, 28 Nov 2023 09:36:00 +0200 [thread overview]
Message-ID: <69c10848d4a4f36ab71ca518f4b23d4dee377572.camel@redhat.com> (raw)
In-Reply-To: <20231108111806.92604-17-nsaenz@amazon.com>
On Wed, 2023-11-08 at 11:17 +0000, Nicolas Saenz Julienne wrote:
> Include the fault's read, write and execute status when exiting to
> user-space.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenz@amazon.com>
> ---
> arch/x86/kvm/mmu/mmu.c | 4 ++--
> include/linux/kvm_host.h | 9 +++++++--
> include/uapi/linux/kvm.h | 6 ++++++
> 3 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 4e02d506cc25..feca077c0210 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -4300,8 +4300,8 @@ static inline u8 kvm_max_level_for_order(int order)
> static void kvm_mmu_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
> struct kvm_page_fault *fault)
> {
> - kvm_prepare_memory_fault_exit(vcpu, fault->gfn << PAGE_SHIFT,
> - PAGE_SIZE, fault->write, fault->exec,
> + kvm_prepare_memory_fault_exit(vcpu, fault->gfn << PAGE_SHIFT, PAGE_SIZE,
> + fault->write, fault->exec, fault->user,
> fault->is_private);
> }
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 71e1e8cf8936..631fd532c97a 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -2367,14 +2367,19 @@ static inline void kvm_account_pgtable_pages(void *virt, int nr)
> static inline void kvm_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
> gpa_t gpa, gpa_t size,
> bool is_write, bool is_exec,
> - bool is_private)
> + bool is_read, bool is_private)
It almost feels like there is a need for a struct to hold all of those parameters.
> {
> vcpu->run->exit_reason = KVM_EXIT_MEMORY_FAULT;
> vcpu->run->memory_fault.gpa = gpa;
> vcpu->run->memory_fault.size = size;
>
> - /* RWX flags are not (yet) defined or communicated to userspace. */
> vcpu->run->memory_fault.flags = 0;
> + if (is_read)
> + vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_READ;
> + if (is_write)
> + vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_WRITE;
> + if (is_exec)
> + vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_EXECUTE;
> if (is_private)
> vcpu->run->memory_fault.flags |= KVM_MEMORY_EXIT_FLAG_PRIVATE;
> }
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 03f5c08fd7aa..0ddffb8b0c99 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -533,7 +533,13 @@ struct kvm_run {
> } notify;
> /* KVM_EXIT_MEMORY_FAULT */
> struct {
> +#define KVM_MEMORY_EXIT_FLAG_READ (1ULL << 0)
> +#define KVM_MEMORY_EXIT_FLAG_WRITE (1ULL << 1)
> +#define KVM_MEMORY_EXIT_FLAG_EXECUTE (1ULL << 2)
> #define KVM_MEMORY_EXIT_FLAG_PRIVATE (1ULL << 3)
> +#define KVM_MEMORY_EXIT_NO_ACCESS \
> + (KVM_MEMORY_EXIT_FLAG_NR | KVM_MEMORY_EXIT_FLAG_NW | \
> + KVM_MEMORY_EXIT_FLAG_NX)
> __u64 flags;
> __u64 gpa;
> __u64 size;
I don't think that KVM_MEMORY_EXIT_FLAG_NR, KVM_MEMORY_EXIT_FLAG_NW, KVM_MEMORY_EXIT_FLAG_NX are defined anywhere.
Also why KVM_MEMORY_EXIT_NO_ACCESS is needed - userspace can infer it from the lack of other access flags.
Best regards,
Maxim Levitsky
next prev parent reply other threads:[~2023-11-28 7:36 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-08 11:17 [RFC 0/33] KVM: x86: hyperv: Introduce VSM support Nicolas Saenz Julienne
2023-11-08 11:17 ` [RFC 01/33] KVM: x86: Decouple lapic.h from hyperv.h Nicolas Saenz Julienne
2023-11-08 16:11 ` Sean Christopherson
2023-11-08 11:17 ` [RFC 02/33] KVM: x86: Introduce KVM_CAP_APIC_ID_GROUPS Nicolas Saenz Julienne
2023-11-08 12:11 ` Alexander Graf
2023-11-08 17:47 ` Sean Christopherson
2023-11-10 18:46 ` Nicolas Saenz Julienne
2023-11-28 6:56 ` Maxim Levitsky
2023-12-01 15:25 ` Nicolas Saenz Julienne
2023-11-08 11:17 ` [RFC 03/33] KVM: x86: hyper-v: Introduce XMM output support Nicolas Saenz Julienne
2023-11-08 11:44 ` Alexander Graf
2023-11-08 12:11 ` Vitaly Kuznetsov
2023-11-08 12:16 ` Alexander Graf
2023-11-28 6:57 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 04/33] KVM: x86: hyper-v: Move hypercall page handling into separate function Nicolas Saenz Julienne
2023-11-28 7:01 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 05/33] KVM: x86: hyper-v: Introduce VTL call/return prologues in hypercall page Nicolas Saenz Julienne
2023-11-08 11:53 ` Alexander Graf
2023-11-08 14:10 ` Nicolas Saenz Julienne
2023-11-28 7:08 ` Maxim Levitsky
2023-11-28 16:33 ` Sean Christopherson
2023-12-01 16:19 ` Nicolas Saenz Julienne
2023-12-01 16:32 ` Sean Christopherson
2023-12-01 16:50 ` Nicolas Saenz Julienne
2023-12-01 17:47 ` Sean Christopherson
2023-12-01 18:15 ` Nicolas Saenz Julienne
2023-12-05 19:21 ` Sean Christopherson
2023-12-05 20:04 ` Maxim Levitsky
2023-12-06 0:07 ` Sean Christopherson
2023-12-06 16:19 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 06/33] KVM: x86: hyper-v: Introduce VTL awareness to Hyper-V's PV-IPIs Nicolas Saenz Julienne
2023-11-28 7:14 ` Maxim Levitsky
2023-12-01 16:31 ` Nicolas Saenz Julienne
2023-12-05 15:02 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 07/33] KVM: x86: hyper-v: Introduce KVM_CAP_HYPERV_VSM Nicolas Saenz Julienne
2023-11-28 7:16 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 08/33] KVM: x86: Don't use hv_timer if CAP_HYPERV_VSM enabled Nicolas Saenz Julienne
2023-11-28 7:21 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 09/33] KVM: x86: hyper-v: Introduce per-VTL vcpu helpers Nicolas Saenz Julienne
2023-11-08 12:21 ` Alexander Graf
2023-11-08 14:04 ` Nicolas Saenz Julienne
2023-11-28 7:25 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 10/33] KVM: x86: hyper-v: Introduce KVM_HV_GET_VSM_STATE Nicolas Saenz Julienne
2023-11-28 7:26 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 11/33] KVM: x86: hyper-v: Handle GET/SET_VP_REGISTER hcall in user-space Nicolas Saenz Julienne
2023-11-08 12:14 ` Alexander Graf
2023-11-28 7:26 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 12/33] KVM: x86: hyper-v: Handle VSM hcalls " Nicolas Saenz Julienne
2023-11-28 7:28 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 13/33] KVM: Allow polling vCPUs for events Nicolas Saenz Julienne
2023-11-28 7:30 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 14/33] KVM: x86: Add VTL to the MMU role Nicolas Saenz Julienne
2023-11-08 17:26 ` Sean Christopherson
2023-11-10 18:52 ` Nicolas Saenz Julienne
2023-11-28 7:34 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 15/33] KVM: x86/mmu: Introduce infrastructure to handle non-executable faults Nicolas Saenz Julienne
2023-11-28 7:34 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 16/33] KVM: x86/mmu: Expose R/W/X flags during memory fault exits Nicolas Saenz Julienne
2023-11-28 7:36 ` Maxim Levitsky [this message]
2023-11-28 16:31 ` Sean Christopherson
2023-11-08 11:17 ` [RFC 17/33] KVM: x86/mmu: Allow setting memory attributes if VSM enabled Nicolas Saenz Julienne
2023-11-28 7:39 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 18/33] KVM: x86: Decouple kvm_get_memory_attributes() from struct kvm's mem_attr_array Nicolas Saenz Julienne
2023-11-08 16:59 ` Sean Christopherson
2023-11-28 7:41 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 19/33] KVM: x86: Decouple kvm_range_has_memory_attributes() " Nicolas Saenz Julienne
2023-11-28 7:42 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 20/33] KVM: x86/mmu: Decouple hugepage_has_attrs() " Nicolas Saenz Julienne
2023-11-28 7:43 ` Maxim Levitsky
2023-11-08 11:17 ` [RFC 21/33] KVM: Pass memory attribute array as a MMU notifier argument Nicolas Saenz Julienne
2023-11-08 17:08 ` Sean Christopherson
2023-11-08 11:17 ` [RFC 22/33] KVM: Decouple kvm_ioctl_set_mem_attributes() from kvm's mem_attr_array Nicolas Saenz Julienne
2023-11-08 11:17 ` [RFC 23/33] KVM: Expose memory attribute helper functions unanimously Nicolas Saenz Julienne
2023-11-08 11:17 ` [RFC 24/33] KVM: x86: hyper-v: Introduce KVM VTL device Nicolas Saenz Julienne
2023-11-08 11:17 ` [RFC 25/33] KVM: Introduce a set of new memory attributes Nicolas Saenz Julienne
2023-11-08 12:30 ` Alexander Graf
2023-11-08 16:43 ` Sean Christopherson
2023-11-08 11:17 ` [RFC 26/33] KVM: x86: hyper-vsm: Allow setting per-VTL " Nicolas Saenz Julienne
2023-11-28 7:44 ` Maxim Levitsky
2023-11-08 11:18 ` [RFC 27/33] KVM: x86/mmu/hyper-v: Validate memory faults against per-VTL memprots Nicolas Saenz Julienne
2023-11-28 7:46 ` Maxim Levitsky
2023-11-08 11:18 ` [RFC 28/33] x86/hyper-v: Introduce memory intercept message structure Nicolas Saenz Julienne
2023-11-28 7:53 ` Maxim Levitsky
2023-11-08 11:18 ` [RFC 29/33] KVM: VMX: Save instruction length on EPT violation Nicolas Saenz Julienne
2023-11-08 12:40 ` Alexander Graf
2023-11-08 16:15 ` Sean Christopherson
2023-11-08 17:11 ` Alexander Graf
2023-11-08 17:20 ` Sean Christopherson
2023-11-08 17:27 ` Alexander Graf
2023-11-08 18:19 ` Jim Mattson
2023-11-08 11:18 ` [RFC 30/33] KVM: x86: hyper-v: Introduce KVM_REQ_HV_INJECT_INTERCEPT request Nicolas Saenz Julienne
2023-11-08 12:45 ` Alexander Graf
2023-11-08 13:38 ` Nicolas Saenz Julienne
2023-11-28 8:19 ` Maxim Levitsky
2023-11-08 11:18 ` [RFC 31/33] KVM: x86: hyper-v: Inject intercept on VTL memory protection fault Nicolas Saenz Julienne
2023-11-08 11:18 ` [RFC 32/33] KVM: x86: hyper-v: Implement HVCALL_TRANSLATE_VIRTUAL_ADDRESS Nicolas Saenz Julienne
2023-11-08 12:49 ` Alexander Graf
2023-11-08 13:44 ` Nicolas Saenz Julienne
2023-11-08 11:18 ` [RFC 33/33] Documentation: KVM: Introduce "Emulating Hyper-V VSM with KVM" Nicolas Saenz Julienne
2023-11-28 8:19 ` Maxim Levitsky
2023-11-08 11:40 ` [RFC 0/33] KVM: x86: hyperv: Introduce VSM support Alexander Graf
2023-11-08 14:41 ` Nicolas Saenz Julienne
2023-11-08 16:55 ` Sean Christopherson
2023-11-08 18:33 ` Sean Christopherson
2023-11-10 17:56 ` Nicolas Saenz Julienne
2023-11-10 19:32 ` Sean Christopherson
2023-11-11 11:55 ` Nicolas Saenz Julienne
2023-11-10 19:04 ` Nicolas Saenz Julienne
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