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From: Sean Christopherson <seanjc@google.com>
To: "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc: Ackerley Tng <ackerleytng@google.com>,
	erdemaktas@google.com, linux-kselftest@vger.kernel.org,
	pbonzini@redhat.com, isaku.yamahata@intel.com, sagis@google.com,
	afranji@google.com, runanwang@google.com, shuah@kernel.org,
	drjones@redhat.com, maz@kernel.org, bgardon@google.com,
	jmattson@google.com, dmatlack@google.com, peterx@redhat.com,
	oupton@google.com, ricarkol@google.com, yang.zhong@intel.com,
	wei.w.wang@intel.com, xiaoyao.li@intel.com, pgonda@google.com,
	marcorr@google.com, eesposit@redhat.com, borntraeger@de.ibm.com,
	eric.auger@redhat.com, wangyanan55@huawei.com,
	aaronlewis@google.com, vkuznets@redhat.com, pshier@google.com,
	axelrasmussen@google.com, zhenzhong.duan@intel.com,
	like.xu@linux.intel.com, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Subject: Re: [RFC PATCH v3 08/31] KVM: selftests: Require GCC to realign stacks on function entry
Date: Wed, 15 Feb 2023 14:19:58 -0800	[thread overview]
Message-ID: <Y+1ajq5PiGgq1q9Q@google.com> (raw)
In-Reply-To: <f3c1ea27-ba90-171b-a336-8da86ec98900@maciej.szmigiero.name>

On Wed, Feb 15, 2023, Maciej S. Szmigiero wrote:
> On 15.02.2023 01:50, Ackerley Tng wrote:
> > To fix this, I propose that in vm_arch_vcpu_add(), we align the
> > allocated stack address and then subtract 8 from that:
> 
> Note that if this code is ever used to launch a vCPU with 32-bit entry
> point it will need to subtract 4 bytes instead of 8 bytes.
> 
> I think it would be worthwhile to at least place a comment mentioning
> this near the stack aligning expression so nobody misses this fact.

Heh, I've no objection to a comment, though this really is the tip of the iceberg
if we want to add 32-bit guest support in selftests.

  reply	other threads:[~2023-02-15 22:20 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-21  0:15 [RFC PATCH v3 00/31] TDX KVM selftests Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 01/31] KVM: selftests: Add function to allow one-to-one GVA to GPA mappings Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 02/31] KVM: selftests: Add support for creating non-default type VMs Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 03/31] KVM: selftests: Expose function that sets up sregs based on VM's mode Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 04/31] KVM: selftests: Store initial stack address in struct kvm_vcpu Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 05/31] KVM: selftests: Refactor steps in vCPU descriptor table initialization Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 06/31] KVM: selftests: Add helper functions to create TDX VMs Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 07/31] KVM: selftests: TDX: Use KVM_TDX_CAPABILITIES to validate TDs' attribute configuration Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 08/31] KVM: selftests: Require GCC to realign stacks on function entry Ackerley Tng
2023-01-21  0:27   ` Sean Christopherson
2023-01-23 18:30     ` Erdem Aktas
2023-01-23 18:50       ` Maciej S. Szmigiero
2023-01-23 18:53         ` Sean Christopherson
2023-01-24  0:04           ` Erdem Aktas
2023-01-24  1:21             ` Sean Christopherson
2023-02-15  0:50               ` Ackerley Tng
2023-02-15 18:44                 ` Maciej S. Szmigiero
2023-02-15 22:19                   ` Sean Christopherson [this message]
2023-02-15 22:24                 ` Sean Christopherson
2023-02-17 18:57                   ` Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 09/31] KVM: selftests: TDX: Add TDX lifecycle test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 10/31] KVM: selftests: TDX: Add report_fatal_error test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 11/31] KVM: selftests: TDX: Adding test case for TDX port IO Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 12/31] KVM: selftests: TDX: Add basic TDX CPUID test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 13/31] KVM: selftests: TDX: Add basic get_td_vmcall_info test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 14/31] KVM: selftests: TDX: Add TDX IO writes test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 15/31] KVM: selftests: TDX: Add TDX IO reads test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 16/31] KVM: selftests: TDX: Add TDX MSR read/write tests Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 17/31] KVM: selftests: TDX: Add TDX HLT exit test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 18/31] KVM: selftests: TDX: Add TDX MMIO reads test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 19/31] KVM: selftests: TDX: Add TDX MMIO writes test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 20/31] KVM: selftests: TDX: Add TDX CPUID TDVMCALL test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 21/31] KVM: selftests: TDX: Verify the behavior when host consumes a TD private memory Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 22/31] KVM: selftests: TDX: Add TDG.VP.INFO test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 23/31] KVM: selftests: Add functions to allow mapping as shared Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 24/31] KVM: selftests: TDX: Add shared memory test Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 25/31] KVM: selftests: Add support for restricted memory Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 26/31] KVM: selftests: TDX: Update load_td_memory_region for VM memory backed by restricted memfd Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 27/31] KVM: selftests: Expose _vm_vaddr_alloc Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 28/31] KVM: selftests: TDX: Add support for TDG.MEM.PAGE.ACCEPT Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 29/31] KVM: selftests: TDX: Add support for TDG.VP.VEINFO.GET Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 30/31] KVM: selftests: TDX: Add TDX UPM selftest Ackerley Tng
2023-01-21  0:15 ` [RFC PATCH v3 31/31] KVM: selftests: TDX: Add TDX UPM selftests for implicit conversion Ackerley Tng

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