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From: Paolo Bonzini <pbonzini@redhat.com>
To: isaku.yamahata@intel.com, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	erdemaktas@google.com, Connor Kuehl <ckuehl@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Cc: isaku.yamahata@gmail.com,
	Sean Christopherson <sean.j.christopherson@intel.com>
Subject: Re: [RFC PATCH v2 14/69] KVM: x86: Split core of hypercall emulation to helper function
Date: Tue, 6 Jul 2021 15:40:04 +0200	[thread overview]
Message-ID: <6e1370ce-d8ed-28cd-799c-f7a9f69e04ef@redhat.com> (raw)
In-Reply-To: <9e1e66787c50232391e20cb4b3d1c5b249e3f910.1625186503.git.isaku.yamahata@intel.com>

On 03/07/21 00:04, isaku.yamahata@intel.com wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
> 
> By necessity, TDX will use a different register ABI for hypercalls.
> Break out the core functionality so that it may be reused for TDX.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> ---
>   arch/x86/include/asm/kvm_host.h |  4 +++
>   arch/x86/kvm/x86.c              | 55 ++++++++++++++++++++-------------
>   2 files changed, 38 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 9c7ced0e3171..80b943e4ab6d 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1667,6 +1667,10 @@ void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu);
>   void kvm_request_apicv_update(struct kvm *kvm, bool activate,
>   			      unsigned long bit);
>   
> +unsigned long __kvm_emulate_hypercall(struct kvm_vcpu *vcpu, unsigned long nr,
> +				      unsigned long a0, unsigned long a1,
> +				      unsigned long a2, unsigned long a3,
> +				      int op_64_bit);
>   int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);
>   
>   int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index d11cf87674f3..795f83a1cf9a 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -8406,26 +8406,15 @@ static void kvm_sched_yield(struct kvm_vcpu *vcpu, unsigned long dest_id)
>   	return;
>   }
>   
> -int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
> +unsigned long __kvm_emulate_hypercall(struct kvm_vcpu *vcpu, unsigned long nr,
> +				      unsigned long a0, unsigned long a1,
> +				      unsigned long a2, unsigned long a3,
> +				      int op_64_bit)
>   {
> -	unsigned long nr, a0, a1, a2, a3, ret;
> -	int op_64_bit;
> -
> -	if (kvm_xen_hypercall_enabled(vcpu->kvm))
> -		return kvm_xen_hypercall(vcpu);
> -
> -	if (kvm_hv_hypercall_enabled(vcpu))
> -		return kvm_hv_hypercall(vcpu);
> -
> -	nr = kvm_rax_read(vcpu);
> -	a0 = kvm_rbx_read(vcpu);
> -	a1 = kvm_rcx_read(vcpu);
> -	a2 = kvm_rdx_read(vcpu);
> -	a3 = kvm_rsi_read(vcpu);
> +	unsigned long ret;
>   
>   	trace_kvm_hypercall(nr, a0, a1, a2, a3);
>   
> -	op_64_bit = is_64_bit_mode(vcpu);
>   	if (!op_64_bit) {
>   		nr &= 0xFFFFFFFF;
>   		a0 &= 0xFFFFFFFF;
> @@ -8434,11 +8423,6 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
>   		a3 &= 0xFFFFFFFF;
>   	}
>   
> -	if (static_call(kvm_x86_get_cpl)(vcpu) != 0) {
> -		ret = -KVM_EPERM;
> -		goto out;
> -	}
> -
>   	ret = -KVM_ENOSYS;
>   
>   	switch (nr) {
> @@ -8475,6 +8459,35 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
>   		ret = -KVM_ENOSYS;
>   		break;
>   	}
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(__kvm_emulate_hypercall);
> +
> +int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
> +{
> +	unsigned long nr, a0, a1, a2, a3, ret;
> +	int op_64_bit;
> +
> +	if (kvm_xen_hypercall_enabled(vcpu->kvm))
> +		return kvm_xen_hypercall(vcpu);
> +
> +	if (kvm_hv_hypercall_enabled(vcpu))
> +		return kvm_hv_hypercall(vcpu);
> +
> +	nr = kvm_rax_read(vcpu);
> +	a0 = kvm_rbx_read(vcpu);
> +	a1 = kvm_rcx_read(vcpu);
> +	a2 = kvm_rdx_read(vcpu);
> +	a3 = kvm_rsi_read(vcpu);
> +
> +	op_64_bit = is_64_bit_mode(vcpu);
> +
> +	if (static_call(kvm_x86_get_cpl)(vcpu) != 0) {
> +		ret = -KVM_EPERM;
> +		goto out;
> +	}
> +
> +	ret = __kvm_emulate_hypercall(vcpu, nr, a0, a1, a2, a3, op_64_bit);
>   out:
>   	if (!op_64_bit)
>   		ret = (u32)ret;
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>


  reply	other threads:[~2021-07-06 13:40 UTC|newest]

Thread overview: 175+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-02 22:04 [RFC PATCH v2 00/69] KVM: X86: TDX support isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 01/69] KVM: TDX: introduce config for KVM " isaku.yamahata
2021-07-06 12:33   ` Paolo Bonzini
2021-07-13 17:54   ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 02/69] KVM: X86: move kvm_cpu_vmxon() from vmx.c to virtext.h isaku.yamahata
2021-07-06 12:33   ` Paolo Bonzini
2021-07-13 17:49   ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 03/69] KVM: X86: move out the definition vmcs_hdr/vmcs from kvm to x86 isaku.yamahata
2021-07-06 12:33   ` Paolo Bonzini
2021-07-13 18:00   ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 04/69] KVM: TDX: Add TDX "architectural" error codes isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 05/69] KVM: TDX: Add architectural definitions for structures and values isaku.yamahata
2021-07-31  1:04   ` Erdem Aktas
2021-08-02 13:25     ` Xiaoyao Li
2021-08-04 20:43       ` Erdem Aktas
2021-08-04 23:13         ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 06/69] KVM: TDX: add a helper function for kvm to call seamcall isaku.yamahata
2021-07-06 12:57   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 07/69] KVM: TDX: define and export helper functions for KVM TDX support isaku.yamahata
2021-10-09  7:50   ` Wang, Wei W
2021-07-02 22:04 ` [RFC PATCH v2 08/69] KVM: TDX: add trace point before/after TDX SEAMCALLs isaku.yamahata
2021-07-06 13:23   ` Paolo Bonzini
2021-07-13 19:53     ` Sean Christopherson
2021-07-13 19:33   ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 09/69] KVM: TDX: Add C wrapper functions for " isaku.yamahata
2021-07-06 13:25   ` Paolo Bonzini
2021-07-13 19:59     ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 10/69] KVM: TDX: Print the name of SEAMCALL status code isaku.yamahata
2021-07-06 13:25   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 11/69] KVM: TDX: Introduce pr_seamcall_ex_ret_info() to print more info when SEAMCALL fails isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 12/69] KVM: Export kvm_io_bus_read for use by TDX for PV MMIO isaku.yamahata
2021-07-06 13:26   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 13/69] KVM: Enable hardware before doing arch VM initialization isaku.yamahata
2021-07-06 13:26   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 14/69] KVM: x86: Split core of hypercall emulation to helper function isaku.yamahata
2021-07-06 13:40   ` Paolo Bonzini [this message]
2021-07-02 22:04 ` [RFC PATCH v2 15/69] KVM: x86: Export kvm_mmio tracepoint for use by TDX for PV MMIO isaku.yamahata
2021-07-06 13:40   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 16/69] KVM: x86/mmu: Zap only leaf SPTEs for deleted/moved memslot by default isaku.yamahata
2021-07-06 13:44   ` Paolo Bonzini
2021-07-13 20:17     ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 17/69] KVM: Add infrastructure and macro to mark VM as bugged isaku.yamahata
2021-07-06 13:45   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 18/69] KVM: Export kvm_make_all_cpus_request() for use in marking VMs " isaku.yamahata
2021-07-06 13:47   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 19/69] KVM: x86: Use KVM_BUG/KVM_BUG_ON to handle bugs that are fatal to the VM isaku.yamahata
2021-07-06 13:47   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 20/69] KVM: x86/mmu: Mark VM as bugged if page fault returns RET_PF_INVALID isaku.yamahata
2021-07-06 13:48   ` Paolo Bonzini
2021-07-13 20:28   ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 21/69] KVM: Add max_vcpus field in common 'struct kvm' isaku.yamahata
2021-07-06 13:49   ` Paolo Bonzini
2021-07-13 20:35     ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 22/69] KVM: x86: Add vm_type to differentiate legacy VMs from protected VMs isaku.yamahata
2021-07-06 13:56   ` Paolo Bonzini
2021-07-06 13:56   ` Paolo Bonzini
2021-07-13 20:39     ` Sean Christopherson
2021-11-11  3:28       ` Xiaoyao Li
2021-11-11  7:28         ` Paolo Bonzini
2021-11-11  8:29           ` Xiaoyao Li
2021-07-02 22:04 ` [RFC PATCH v2 23/69] KVM: x86: Hoist kvm_dirty_regs check out of sync_regs() isaku.yamahata
2021-07-06 13:57   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 24/69] KVM: x86: Introduce "protected guest" concept and block disallowed ioctls isaku.yamahata
2021-07-06 13:59   ` Paolo Bonzini
2021-07-20 22:08     ` Tom Lendacky
2021-11-09 13:37       ` Xiaoyao Li
2021-11-09 17:15         ` Paolo Bonzini
2021-11-10  1:45           ` Xiaoyao Li
2021-07-02 22:04 ` [RFC PATCH v2 25/69] KVM: x86: Add per-VM flag to disable direct IRQ injection isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 26/69] KVM: x86: Add flag to disallow #MC injection / KVM_X86_SETUP_MCE isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 27/69] KVM: x86: Add flag to mark TSC as immutable (for TDX) isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 28/69] KVM: Add per-VM flag to mark read-only memory as unsupported isaku.yamahata
2021-07-06 14:03   ` Paolo Bonzini
2021-07-06 19:04     ` Brijesh Singh
2021-07-02 22:04 ` [RFC PATCH v2 29/69] KVM: Add per-VM flag to disable dirty logging of memslots for TDs isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 30/69] KVM: x86: Add per-VM flag to disable in-kernel I/O APIC and level routes isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 31/69] KVM: x86: add per-VM flags to disable SMI/INIT/SIPI isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 32/69] KVM: x86: Allow host-initiated WRMSR to set X2APIC regardless of CPUID isaku.yamahata
2021-07-06 14:09   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 33/69] KVM: x86: Add kvm_x86_ops .cache_gprs() and .flush_gprs() isaku.yamahata
2021-07-06 14:10   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 34/69] KVM: x86: Add support for vCPU and device-scoped KVM_MEMORY_ENCRYPT_OP isaku.yamahata
2021-07-06 14:12   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 35/69] KVM: x86: Introduce vm_teardown() hook in kvm_arch_vm_destroy() isaku.yamahata
2021-07-06 14:34   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 36/69] KVM: x86: Add a switch_db_regs flag to handle TDX's auto-switched behavior isaku.yamahata
2021-07-06 14:36   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 37/69] KVM: x86: Check for pending APICv interrupt in kvm_vcpu_has_events() isaku.yamahata
2021-07-06 14:50   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 38/69] KVM: x86: Add option to force LAPIC expiration wait isaku.yamahata
2021-07-06 14:35   ` Paolo Bonzini
2021-07-13 20:51     ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 39/69] KVM: x86: Add guest_supported_xss placholder isaku.yamahata
2021-07-06 14:41   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 40/69] KVM: Export kvm_is_reserved_pfn() for use by TDX isaku.yamahata
2021-07-06 14:32   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 41/69] KVM: x86: Add infrastructure for stolen GPA bits isaku.yamahata
2021-07-06 14:54   ` Paolo Bonzini
2021-08-05 11:44   ` Kai Huang
2021-08-05 16:06     ` Sean Christopherson
2021-08-05 17:07       ` Edgecombe, Rick P
2021-08-05 17:39         ` Sean Christopherson
2021-08-05 18:43           ` Edgecombe, Rick P
2021-08-05 18:58             ` Sean Christopherson
2021-08-05 21:59       ` Kai Huang
2021-08-06 19:02         ` Sean Christopherson
2021-08-06 22:00           ` Kai Huang
2021-08-06 22:09             ` Sean Christopherson
2021-08-06 22:24               ` Kai Huang
2021-07-02 22:04 ` [RFC PATCH v2 42/69] KVM: x86/mmu: Explicitly check for MMIO spte in fast page fault isaku.yamahata
2021-07-06 14:54   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 43/69] KVM: x86/mmu: Allow non-zero init value for shadow PTE isaku.yamahata
2021-07-06 14:56   ` Paolo Bonzini
2021-07-08 15:20     ` Isaku Yamahata
2021-07-02 22:04 ` [RFC PATCH v2 44/69] KVM: x86/mmu: Refactor shadow walk in __direct_map() to reduce indentation isaku.yamahata
2021-07-06 14:56   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 45/69] KVM: x86/mmu: Return old SPTE from mmu_spte_clear_track_bits() isaku.yamahata
2021-07-06 14:56   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 46/69] KVM: x86/mmu: Frame in support for private/inaccessible shadow pages isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 47/69] KVM: x86/mmu: Move 'pfn' variable to caller of direct_page_fault() isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 48/69] KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 49/69] KVM: VMX: Modify NMI and INTR handlers to take intr_info as param isaku.yamahata
2021-07-06 14:50   ` Paolo Bonzini
2021-07-02 22:04 ` [RFC PATCH v2 50/69] KVM: VMX: Move NMI/exception handler to common helper isaku.yamahata
2021-07-02 22:04 ` [RFC PATCH v2 51/69] KVM: x86/mmu: Allow per-VM override of the TDP max page level isaku.yamahata
2021-07-06 14:58   ` Paolo Bonzini
2021-07-13 21:02     ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 52/69] KVM: VMX: Split out guts of EPT violation to common/exposed function isaku.yamahata
2021-07-06 14:52   ` Paolo Bonzini
2021-07-13 20:57     ` Sean Christopherson
2021-07-02 22:04 ` [RFC PATCH v2 53/69] KVM: VMX: Define EPT Violation architectural bits isaku.yamahata
2021-07-06 14:41   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 54/69] KVM: VMX: Define VMCS encodings for shared EPT pointer isaku.yamahata
2021-07-06 14:42   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 55/69] KVM: VMX: Add 'main.c' to wrap VMX and TDX isaku.yamahata
2021-07-06 14:43   ` Paolo Bonzini
2021-07-08 15:21     ` Isaku Yamahata
2021-07-08 15:29       ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 56/69] KVM: VMX: Move setting of EPT MMU masks to common VT-x code isaku.yamahata
2021-07-06 14:43   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 57/69] KVM: VMX: Move register caching logic to common code isaku.yamahata
2021-07-06 14:44   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 58/69] KVM: TDX: Define TDCALL exit reason isaku.yamahata
2021-07-02 22:05 ` [RFC PATCH v2 59/69] KVM: TDX: Stub in tdx.h with structs, accessors, and VMCS helpers isaku.yamahata
2021-07-02 22:05 ` [RFC PATCH v2 60/69] KVM: VMX: Add macro framework to read/write VMCS for VMs and TDs isaku.yamahata
2021-07-06 14:46   ` Paolo Bonzini
2021-07-13 20:56     ` Sean Christopherson
2021-07-02 22:05 ` [RFC PATCH v2 61/69] KVM: VMX: Move AR_BYTES encoder/decoder helpers to common.h isaku.yamahata
2021-07-06 14:46   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 62/69] KVM: VMX: MOVE GDT and IDT accessors to common code isaku.yamahata
2021-07-06 14:46   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 63/69] KVM: VMX: Move .get_interrupt_shadow() implementation to common VMX code isaku.yamahata
2021-07-06 14:17   ` Paolo Bonzini
2021-07-13 20:45     ` Sean Christopherson
2021-07-02 22:05 ` [RFC PATCH v2 64/69] cpu/hotplug: Document that TDX also depends on booting CPUs once isaku.yamahata
2021-07-02 22:05 ` [RFC PATCH v2 65/69] KVM: X86: Introduce initial_tsc_khz in struct kvm_arch isaku.yamahata
2021-07-06 14:22   ` Paolo Bonzini
2021-07-13 18:14     ` Sean Christopherson
2021-07-26  5:31       ` Xiaoyao Li
2021-07-13 18:09   ` Sean Christopherson
2021-07-02 22:05 ` [RFC PATCH v2 66/69] KVM: TDX: Add "basic" support for building and running Trust Domains isaku.yamahata
     [not found]   ` <CAAYXXYyz3S_cc9ohfkUWN4ohrNq5f+h3608CW5twb-n8i=ogBA@mail.gmail.com>
2021-10-21 21:44     ` Sagi Shahar
2021-10-24 12:59       ` Xiaoyao Li
2021-07-02 22:05 ` [RFC PATCH v2 67/69] KVM: TDX: add trace point for TDVMCALL and SEPT operation isaku.yamahata
2021-07-06 14:23   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 68/69] KVM: TDX: add document on TDX MODULE isaku.yamahata
2021-07-06 14:23   ` Paolo Bonzini
2021-07-02 22:05 ` [RFC PATCH v2 69/69] Documentation/virtual/kvm: Add Trust Domain Extensions(TDX) isaku.yamahata
2021-07-06 14:49 ` [RFC PATCH v2 00/69] KVM: X86: TDX support Paolo Bonzini
2021-07-06 14:53 ` Paolo Bonzini
2021-07-26 12:56 ` Paolo Bonzini
2021-07-28 16:51   ` Sean Christopherson
2021-08-02  7:33     ` Paolo Bonzini
2021-08-02 15:12       ` Sean Christopherson
2021-08-02 15:46         ` Paolo Bonzini

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