From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: "Kalra, Ashish" <ashish.kalra@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "Rafael J. Wysocki" <rafael@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Elena Reshetova <elena.reshetova@intel.com>,
Jun Nakajima <jun.nakajima@intel.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Sean Christopherson <seanjc@google.com>,
"Huang, Kai" <kai.huang@intel.com>, Baoquan He <bhe@redhat.com>,
kexec@lists.infradead.org, linux-coco@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: [PATCHv6 10/16] x86/tdx: Convert shared memory back to private on kexec
Date: Mon, 29 Jan 2024 15:34:26 +0200 [thread overview]
Message-ID: <ao36mdmctptya2r25v3lvuocjbhllum2upmskxjcjtt3c7o3ii@nsghte2cnmkx> (raw)
In-Reply-To: <fad515ec-aba3-4f48-b8be-ebc6640899e3@amd.com>
On Mon, Jan 29, 2024 at 07:09:37AM -0600, Kalra, Ashish wrote:
> Hello Kirill,
>
> On 1/29/2024 4:36 AM, Kirill A. Shutemov wrote:
> > On Mon, Jan 29, 2024 at 04:24:09AM -0600, Kalra, Ashish wrote:
> > > In case of SNP and crash/kdump case, we need to prevent the boot_ghcb being
> > > converted to shared (in snp_kexec_unshare_mem()) as the boot_ghcb is
> > > required to handle all I/O for disabling IO-APIC/lapic, hpet, etc., as the
> > > enc_kexec_unshare_mem() callback is invoked before the apics, hpet, etc. are
> > > disabled.
> > >
> > > Is there any reason why enc_kexec_unshare_mem() callback is invoked in crash
> > > case before the IO-APIC/lapic, hpet, etc. are shutdown/disabled ?
> > Not really. Either way works for TDX. I've tested the patch below. Is it
> > what you want?
> >
> > diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
> > index 6585a5f2c2ba..3001f4857ed7 100644
> > --- a/arch/x86/kernel/crash.c
> > +++ b/arch/x86/kernel/crash.c
> > @@ -107,11 +107,6 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
> > crash_smp_send_stop();
> > - if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
> > - x86_platform.guest.enc_kexec_stop_conversion(true);
> > - x86_platform.guest.enc_kexec_unshare_mem();
> > - }
> > -
> > cpu_emergency_disable_virtualization();
> > /*
> > @@ -129,6 +124,12 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
> > #ifdef CONFIG_HPET_TIMER
> > hpet_disable();
> > #endif
> > +
> > + if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
> > + x86_platform.guest.enc_kexec_stop_conversion(true);
> > + x86_platform.guest.enc_kexec_unshare_mem();
> > + }
> > +
> > crash_save_cpu(regs, safe_smp_processor_id());
> > }
>
> Yes, this will work for SNP.
Okay, good. Will include the change into the next version of the patchset.
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2024-01-29 13:44 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-24 12:55 [PATCHv6 00/16] x86/tdx: Add kexec support Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 01/16] x86/acpi: Extract ACPI MADT wakeup code into a separate file Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 02/16] x86/apic: Mark acpi_mp_wake_* variables as __ro_after_init Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 03/16] cpu/hotplug: Add support for declaring CPU offlining not supported Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 04/16] cpu/hotplug, x86/acpi: Disable CPU offlining for ACPI MADT wakeup Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 05/16] x86/kexec: Keep CR4.MCE set during kexec for TDX guest Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 06/16] x86/mm: Make x86_platform.guest.enc_status_change_*() return errno Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 07/16] x86/mm: Return correct level from lookup_address() if pte is none Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 08/16] x86/tdx: Account shared memory Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 09/16] x86/mm: Adding callbacks to prepare encrypted memory for kexec Kirill A. Shutemov
2024-01-29 7:22 ` Nikolay Borisov
2024-01-24 12:55 ` [PATCHv6 10/16] x86/tdx: Convert shared memory back to private on kexec Kirill A. Shutemov
2024-01-29 10:24 ` Kalra, Ashish
2024-01-29 10:36 ` Kirill A. Shutemov
2024-01-29 13:09 ` Kalra, Ashish
2024-01-29 13:34 ` Kirill A. Shutemov [this message]
2024-01-24 12:55 ` [PATCHv6 11/16] x86/mm: Make e820_end_ram_pfn() cover E820_TYPE_ACPI ranges Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 12/16] x86/acpi: Rename fields in acpi_madt_multiproc_wakeup structure Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 13/16] x86/acpi: Do not attempt to bring up secondary CPUs in kexec case Kirill A. Shutemov
2024-01-24 12:55 ` [PATCHv6 14/16] x86/smp: Add smp_ops.stop_this_cpu() callback Kirill A. Shutemov
2024-01-26 14:08 ` Huang, Kai
2024-01-24 12:55 ` [PATCHv6 15/16] x86/mm: Introduce kernel_ident_mapping_free() Kirill A. Shutemov
2024-01-26 14:10 ` Huang, Kai
2024-01-24 12:55 ` [PATCHv6 16/16] x86/acpi: Add support for CPU offlining for ACPI MADT wakeup method Kirill A. Shutemov
2024-01-26 14:21 ` Huang, Kai
2024-01-27 18:15 ` kirill.shutemov
2024-01-26 20:03 ` Kuppuswamy Sathyanarayanan
2024-01-27 19:35 ` Kirill A. Shutemov
2024-01-30 13:43 ` [PATCHv6 00/16] x86/tdx: Add kexec support Paolo Bonzini
2024-01-30 13:55 ` Kirill A. Shutemov
2024-01-30 14:59 ` Paolo Bonzini
2024-01-30 15:15 ` Kirill A. Shutemov
2024-01-30 14:04 ` Huang, Kai
2024-01-31 7:31 ` Nikolay Borisov
2024-01-31 12:47 ` Baoquan He
2024-01-31 12:58 ` Nikolay Borisov
2024-01-31 13:07 ` Huang, Kai
2024-01-31 15:23 ` Baoquan He
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