On Wed, May 08, 2024 at 02:04:22PM +0200, Borislav Petkov wrote:
> On Mon, May 06, 2024 at 06:37:19PM +0300, Kirill A. Shutemov wrote:
> > "second kernel" is nomenclature kexec folks are using, but okay.
>
> And the "third kernel" is the one which got kexec-ed
On Sun, May 05, 2024 at 02:13:19PM +0200, Borislav Petkov wrote:
> On Tue, Apr 09, 2024 at 02:30:02PM +0300, Kirill A. Shutemov wrote:
> > TDX guests allocate shared buffers to perform I/O. It is done by
> > allocating pages normally from the buddy allocator and converting the
down(void)
> > #ifdef CONFIG_X86_64
> > x86_platform.iommu_shutdown();
> > #endif
> > +
> > + if (kexec_in_progress)
> > + x86_platform.guest.enc_kexec_unshare_mem();
>
> ... but they're split here.
>
> And I don't know why and nothing tells me...
I do. See comment just above enc_kexec_stop_conversion() call.
Do you want also comment for enc_kexec_unshare_mem() ?
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
On Tue, Apr 30, 2024 at 03:03:23PM +0200, Borislav Petkov wrote:
> On Tue, Apr 09, 2024 at 02:29:57PM +0300, Kirill A. Shutemov wrote:
> > +1:
> > + testq $X86_CR4_MCE, %r13
> > + jz 1f
> > + ALTERNATIVE "", __stringify(orl $X86_CR4_MCE, %ea
On Mon, Apr 29, 2024 at 04:45:08PM +0200, Borislav Petkov wrote:
> On Mon, Apr 29, 2024 at 04:17:38PM +0300, Kirill A. Shutemov wrote:
> > As I mentioned above, clearing CR4.MCE triggers #VE. It is quirk of the
> > platform.
>
> You mean when identity_mapped() runs as part
On Sun, Apr 28, 2024 at 07:25:57PM +0200, Borislav Petkov wrote:
> On Tue, Apr 09, 2024 at 02:29:58PM +0300, Kirill A. Shutemov wrote:
> > TDX is going to have more than one reason to fail
> > enc_status_change_prepare().
> >
> > Change the callback to return err
On Sun, Apr 28, 2024 at 07:11:11PM +0200, Borislav Petkov wrote:
> On Tue, Apr 09, 2024 at 06:26:05PM +0300, Kirill A. Shutemov wrote:
> > From 6be428e3b1c6fb494b2c48ba6a7c133514a0b2b4 Mon Sep 17 00:00:00 2001
> > From: "Kirill A. Shutemov"
> > Date: Fri, 10 Feb
On Wed, Apr 24, 2024 at 03:50:52PM +0200, Borislav Petkov wrote:
> On Wed, Apr 24, 2024 at 11:38:42AM +0300, Kirill A. Shutemov wrote:
> > It was wrong from beginning. If ACPI MADT wake up method is used on the
> > platform, we cannot handle offline, regardless if it is TDX or n
MADT is the only wakeup method supported in TDX guests. But offline
is broken is because of ACPI MADT, not because of TDX.
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
On Thu, Apr 18, 2024 at 04:37:09PM +0200, Borislav Petkov wrote:
> On Tue, Apr 09, 2024 at 02:29:55PM +0300, Kirill A. Shutemov wrote:
> > +/* Declare CPU offlining not supported */
> > +void cpu_hotplug_disable_offlining(void)
> > +{
> > + cpu_maps_update_begin();
On Thu, Apr 18, 2024 at 06:03:24PM +0200, Borislav Petkov wrote:
> On Tue, Apr 09, 2024 at 02:29:53PM +0300, Kirill A. Shutemov wrote:
> > diff --git a/arch/x86/kernel/acpi/Makefile b/arch/x86/kernel/acpi/Makefile
> > index fc17b3f136fe..8c7329c88a75 100644
> > --- a/arch/x86
On Tue, Apr 09, 2024 at 07:22:24AM -0700, Sean Christopherson wrote:
> On Tue, Apr 09, 2024, Kirill A. Shutemov wrote:
> > Depending on setup, TDX guests might be allowed to clear CR4.MCE.
> > Attempt to clear it leads to #VE.
> >
> > Use alternatives to keep the flag
yl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
On Thu, Apr 04, 2024 at 10:40:34AM +1300, Huang, Kai wrote:
>
>
> On 3/04/2024 4:42 am, Kirill A. Shutemov wrote:
> > On Fri, Mar 29, 2024 at 06:48:21PM +0200, Kirill A. Shutemov wrote:
> > > On Fri, Mar 29, 2024 at 11:21:32PM +0800, Xiaoyao Li wrote:
> > &g
On Fri, Mar 29, 2024 at 06:48:21PM +0200, Kirill A. Shutemov wrote:
> On Fri, Mar 29, 2024 at 11:21:32PM +0800, Xiaoyao Li wrote:
> > On 3/25/2024 6:38 PM, Kirill A. Shutemov wrote:
> > > TDX guests are not allowed to clear CR4.MCE. Attempt to clear it leads
> > > to #VE
On Fri, Mar 29, 2024 at 11:21:32PM +0800, Xiaoyao Li wrote:
> On 3/25/2024 6:38 PM, Kirill A. Shutemov wrote:
> > TDX guests are not allowed to clear CR4.MCE. Attempt to clear it leads
> > to #VE.
>
> Will we consider making it more safe and compatible for futu
the reserved crashkernel memory.
>
> Signed-off-by: Ashish Kalra
Acked-by: Kirill A. Shutemov
I guess it would be better if I take this patch into my kexec patchset. I
guess I just got lucky not to step onto the issue.
--
Kiryl Shutsemau / Kirill A. Shutemov
__
On Tue, Feb 27, 2024 at 11:24:35PM +0200, Kirill A. Shutemov wrote:
> The patchset adds bits and pieces to get kexec (and crashkernel) work on
> TDX guest.
>
> The last patch implements CPU offlining according to the approved ACPI
> spec change poposal[1]. It unlocks kexec with a
On Wed, Feb 28, 2024 at 11:08:38AM +1300, Huang, Kai wrote:
>
>
> On 28/02/2024 10:24 am, Kirill A. Shutemov wrote:
> > When MADT is parsed, print MULTIPROC_WAKEUP information:
> >
> > ACPI: MP Wakeup (version[1], mailbox[0x7fffd000], reset[0x7fffe068])
>
Please disregard. I've sent old patches by mistake.
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
On Sun, Feb 25, 2024 at 04:58:46PM +0200, Kirill A. Shutemov wrote:
> On Fri, Feb 23, 2024 at 11:39:07AM -0800, Dave Hansen wrote:
> > On 2/12/24 02:44, Kirill A. Shutemov wrote:
> > > +static void tdx_kexec_stop_conversion(bool crash)
> > > +{
> > > + /* S
On Fri, Feb 23, 2024 at 11:08:18AM -0800, Dave Hansen wrote:
> On 2/12/24 02:44, Kirill A. Shutemov wrote:
> > The kernel will convert all shared memory back to private during kexec.
> > The direct mapping page tables will provide information on which memory
> > is shared.
>
On Fri, Feb 23, 2024 at 11:39:07AM -0800, Dave Hansen wrote:
> On 2/12/24 02:44, Kirill A. Shutemov wrote:
> > +static void tdx_kexec_stop_conversion(bool crash)
> > +{
> > + /* Stop new private<->shared conversions */
> > + conversion_allowed = false;
>
On Thu, Feb 22, 2024 at 07:01:41PM +0800, Baoquan He wrote:
> On 02/21/24 at 04:15pm, Kirill A. Shutemov wrote:
> > On Wed, Feb 21, 2024 at 10:37:29AM +0800, Baoquan He wrote:
> > > > diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
> > > >
> > + * conversions_in_progress.
> > +*/
> > + barrier();
>
> This should be smp_wmb().
>
Why?
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
> > *
> > - * Note: We return pud and pmd either when the entry is marked large
> > - * or when the present bit is not set. Otherwise we would return a
> > - * pointer to a nonexisting mapping.
> > + * Note: the function returns p4d, pud and pmd either when the entry
> + E820_TYPE_ACPI))
> set_pmd_init(pmd, __pmd(0), init);
> continue;
Why do you single out phys_pmd_init()? I think it has to be addressed for
all page table levels as we do for E820_TYPE_RAM and E820_TYPE_RESERVED_KERN.
--
pud and pmd either when the entry is marked
+ * large or when the present bit is not set. Otherwise it returns NULL.
*/
pte_t *lookup_address(unsigned long address, unsigned int *level)
{
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
On Mon, Feb 19, 2024 at 01:12:32PM +0800, Baoquan He wrote:
> On 02/12/24 at 12:44pm, Kirill A. Shutemov wrote:
> > lookup_address() only returns correct page table level for the entry if
> > the entry is not none.
> >
> > Make the helper to always return correct 'lev
viewed-by: Baoquan He
Thanks!
>From 23b7f9856a3d6b91c702def1e03872a60ae07d0e Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov"
Date: Mon, 19 Feb 2024 11:58:19 +0200
Subject: [PATCH] ACPI: tables: Print MULTIPROC_WAKEUP when MADT is parse
When MADT is parsed, print MULTIPROC_WAKEU
On Tue, Jan 30, 2024 at 03:59:34PM +0100, Paolo Bonzini wrote:
> On Tue, Jan 30, 2024 at 3:34 PM Kirill A. Shutemov
> wrote:
> >
> > On Tue, Jan 30, 2024 at 02:43:15PM +0100, Paolo Bonzini wrote:
> > > On 1/24/24 13:55, Kirill A. Shutemov wrote:
> > > > T
On Tue, Jan 30, 2024 at 02:43:15PM +0100, Paolo Bonzini wrote:
> On 1/24/24 13:55, Kirill A. Shutemov wrote:
> > The patchset adds bits and pieces to get kexec (and crashkernel) work on
> > TDX guest.
> >
> > The last patch implements CPU offlining according to the ap
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 th
st.enc_kexec_unshare_mem();
+ }
+
crash_save_cpu(regs, safe_smp_processor_id());
}
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
+
> > + if (!timeout)
> Nit: IMO, since you are dumping failure error message (not timeout
> message), you can use non zero acpi_mp_wake_mailbox->command
> check. But it is up to you.
I think my version is pretty idiomatic. The same pattern used in other
places. For instance,
On Tue, Jan 16, 2024 at 10:28:22AM +0300, Kirill A. Shutemov wrote:
> > > @@ -809,12 +823,25 @@ static bool tdx_enc_status_changed(unsigned long
> > > vaddr, int numpages, bool enc)
> > > static int tdx_enc_status_change_prepare(unsigned long
On Tue, Jan 16, 2024 at 10:01:47AM +0200, Nikolay Borisov wrote:
>
>
> On 16.01.24 г. 9:28 ч., Kirill A. Shutemov wrote:
>
>
>
> > > > @@ -41,6 +44,9 @@
> > > >static atomic_long_t nr_shared;
> > > > +static atomic_t conversions_in_pr
On Mon, Jan 15, 2024 at 12:53:42PM +0200, Nikolay Borisov wrote:
>
>
> On 23.12.23 г. 1:52 ч., Kirill A. Shutemov wrote:
> > TDX guests allocate shared buffers to perform I/O. It is done by
> > allocating pages normally from the buddy allocator and converti
On Mon, Jan 15, 2024 at 03:19:43PM +0200, Nikolay Borisov wrote:
> > + /* Switch to identity mapping */
> > + movq%rsi, %rax
> > + movq%rax, %cr3
>
> nit: Can't you move directly to cr3
For some reason, I thought I couldn't. Will fix.
--
Kiryl Shutse
On Wed, Dec 13, 2023 at 09:22:34AM -0800, Sean Christopherson wrote:
> On Tue, Dec 12, 2023, Kirill A. Shutemov wrote:
> > On Tue, Dec 05, 2023 at 03:45:01AM +0300, Kirill A. Shutemov wrote:
> > > kvm_guest_cpu_offline() tries to disable kvmclock regardless if it is
>
If the helper is defined, it is called instead of halt() to stop the CPU
at the end of stop_this_cpu() and on crash CPU shutdown.
ACPI MADT will use it to hand over the CPU to BIOS in order to be able
to wake it up again after kexec.
Signed-off-by: Kirill A. Shutemov
---
v5.1:
- Fix build
If the helper is defined, it is called instead of halt() to stop the CPU
at the end of stop_this_cpu() and on crash CPU shutdown.
ACPI MADT will use it to hand over the CPU to BIOS in order to be able
to wake it up again after kexec.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/include/asm
()
callback hooked up and the pgd_t to free.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/include/asm/init.h | 3 ++
arch/x86/mm/ident_map.c | 73 +
2 files changed, 76 insertions(+)
diff --git a/arch/x86/include/asm/init.h b/arch/x86/include/asm/init.h
TDX guests are not allowed to clear CR4.MCE. Attempt to clear it leads
to #VE.
Use alternatives to keep the flag during kexec for TDX guests.
The change doesn't affect non-TDX-guest environments.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
---
arch/x86/kernel/relocate_kernel_64
CPU.
The change conforms to the approved ACPI spec change proposal. See the
Link.
Signed-off-by: Kirill A. Shutemov
Link: https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher
---
arch/x86/include/asm/acpi.h | 2 +
arch/x86/kernel/acpi/Makefile| 2 +-
arch/x86/kernel
confusion.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
Reviewed-by: Kuppuswamy Sathyanarayanan
---
arch/x86/kernel/acpi/madt_wakeup.c | 2 +-
include/acpi/actbl2.h | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/acpi/madt_wakeup.c
it.
Keep track of the number of shared pages. This will allow for
cross-checking against the shared information in the direct mapping and
reporting if the shared bit is lost.
Include a debugfs interface that allows for the check to be performed at
any point.
Signed-off-by: Kirill A. Shutemov
---
arch
with code that may
access shared memory.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Rick Edgecombe
---
arch/x86/coco/tdx/tdx.c | 119 +++-
arch/x86/include/asm/x86_init.h | 2 +
arch/x86/kernel/crash.c | 6 ++
arch/x86/kernel/reboot.c
-off-by: Kirill A. Shutemov
Reviewed-by: Thomas Gleixner
---
arch/x86/coco/core.c | 1 -
arch/x86/kernel/acpi/madt_wakeup.c | 3 +++
include/linux/cc_platform.h| 10 --
kernel/cpu.c | 3 +--
4 files changed, 4 insertions(+), 13 deletions
: 0x8110687c (kvmclock_disable+0x1c/0x30)
kvmclock enabling is gated by CLOCKSOURCE and CLOCKSOURCE2 KVM paravirt
features.
Do not disable kvmclock if it was not enabled.
Signed-off-by: Kirill A. Shutemov
Fixes: c02027b5742b ("x86/kvm: Disable kvmclock on all CPUs on shutdown")
Reviewe
TDX is going to have more than one reason to fail
enc_status_change_prepare().
Change the callback to return errno instead of assuming -EIO;
enc_status_change_finish() changed too to keep the interface symmetric.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/coco/tdx/tdx.c | 20
In order to prepare for the expansion of support for the ACPI MADT
wakeup method, move the relevant code into a separate file.
Introduce a new configuration option to clearly indicate dependencies
without the use of ifdefs.
There have been no functional changes.
Signed-off-by: Kirill
it.
This is safe as the booting kernel has the mailbox address cached
already and acpi_wakeup_cpu() uses the cached value to bring up the
secondary CPUs.
Note: This is a Linux specific convention and not covered by the
ACPI specification.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai
by
one PGD entry in 5-level paging mode.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Rick Edgecombe
---
arch/x86/include/asm/pgtable_types.h | 1 +
arch/x86/mm/pat/set_memory.c | 8
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm
ted()/cpu_hotplug_disable_offlining()/;
- use play_dead_common() to implement acpi_mp_play_dead();
- cond_resched() in tdx_shared_memory_show();
- s/target kernel/second kernel/;
- Update commit messages and comments;
Kirill A. Shutemov (16):
x86/acpi: Extract ACPI MADT wakeup code into a separate f
CC_ATTR_HOTPLUG_DISABLED for ACPI
MADT wakeup method.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Thomas Gleixner
---
include/linux/cpu.h | 2 ++
kernel/cpu.c| 13 -
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index fc8094419084
guest. TDX
guest uses E820_TYPE_ACPI to store the unaccepted memory bitmap and pass
it between the kernels on kexec.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/kernel/e820.c | 9 +
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820
acpi_mp_wake_mailbox_paddr and acpi_mp_wake_mailbox initialized once
during ACPI MADT init and never changed.
Signed-off-by: Kirill A. Shutemov
Acked-by: Kai Huang
---
arch/x86/kernel/acpi/madt_wakeup.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel
ve addressed all your feedback, but this gave me pause. Looks like none
of kernel_ident_mapping_init() users frees memory on failure.
Is it okay to get this part as is and I will follow up with patchset that
fixes memory handling for all kernel_ident_mapping_init() users?
--
Kiryl Shutsemau
On Tue, Dec 05, 2023 at 03:45:01AM +0300, Kirill A. Shutemov wrote:
> kvm_guest_cpu_offline() tries to disable kvmclock regardless if it is
> present in the VM. It leads to write to a MSR that doesn't exist on some
> configurations, namely in TDX guest:
>
> unchecked MSR acce
guest. TDX
guest uses E820_TYPE_ACPI to store the unaccepted memory bitmap and pass
it between the kernels on kexec.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/kernel/e820.c | 9 +
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820
CC_ATTR_HOTPLUG_DISABLED for ACPI
MADT wakeup method.
Signed-off-by: Kirill A. Shutemov
---
include/linux/cpu.h | 2 ++
kernel/cpu.c| 13 -
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index fc8094419084..46f2e34a0c5e 100644
TDX is going to have more than one reason to fail
enc_status_change_prepare().
Change the callback to return errno instead of assuming -EIO;
enc_status_change_finish() changed too to keep the interface symmetric.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/coco/tdx/tdx.c | 20
by
one PGD entry in 5-level paging mode.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Rick Edgecombe
---
arch/x86/include/asm/pgtable_types.h | 1 +
arch/x86/mm/pat/set_memory.c | 8
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm
In order to prepare for the expansion of support for the ACPI MADT
wakeup method, move the relevant code into a separate file.
Introduce a new configuration option to clearly indicate dependencies
without the use of ifdefs.
There have been no functional changes.
Signed-off-by: Kirill
-off-by: Kirill A. Shutemov
Link: https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher
---
arch/x86/include/asm/smp.h | 1 +
arch/x86/kernel/acpi/Makefile| 2 +-
arch/x86/kernel/acpi/madt_playdead.S | 21 ++
arch/x86/kernel/acpi/madt_wakeup.c | 295
: 0x8110687c (kvmclock_disable+0x1c/0x30)
kvmclock enabling is gated by CLOCKSOURCE and CLOCKSOURCE2 KVM paravirt
features.
Do not disable kvmclock if it was not enabled.
Signed-off-by: Kirill A. Shutemov
Fixes: c02027b5742b ("x86/kvm: Disable kvmclock on all CPUs on shutdown")
Reviewe
-by: Kirill A. Shutemov
---
arch/x86/coco/core.c | 1 -
arch/x86/kernel/acpi/madt_wakeup.c | 3 +++
include/linux/cc_platform.h| 10 --
kernel/cpu.c | 3 +--
4 files changed, 4 insertions(+), 13 deletions(-)
diff --git a/arch/x86/coco/core.c b/arch
confusion.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
Reviewed-by: Kuppuswamy Sathyanarayanan
---
arch/x86/kernel/acpi/madt_wakeup.c | 2 +-
include/acpi/actbl2.h | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/acpi/madt_wakeup.c
private mapping is fatal. It leads to
unrecoverable TD exit.
On kexec walk direct mapping and convert all shared memory back to
private. It makes all RAM private again and second kernel may use it
normally.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/coco/tdx/kexec.c | 0
arch/x86
TDX guests are not allowed to clear CR4.MCE. Attempt to clear it leads
to #VE.
Use alternatives to keep the flag during kexec for TDX guests.
The change doesn't affect non-TDX-guest environments.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
---
arch/x86/kernel/relocate_kernel_64
org/all/13356251.uLZWGnKmhe@kreacher
Kirill A. Shutemov (14):
x86/acpi: Extract ACPI MADT wakeup code into a separate file
x86/apic: Mark acpi_mp_wake_* variables as __ro_after_init
cpu/hotplug: Add support for declaring CPU offlining not supported
cpu/hotplug, x86/acpi: Disable CPU offlin
acpi_mp_wake_mailbox_paddr and acpi_mp_wake_mailbox initialized once
during ACPI MADT init and never changed.
Signed-off-by: Kirill A. Shutemov
Acked-by: Kai Huang
---
arch/x86/kernel/acpi/madt_wakeup.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel
kernel with signle CPU is enough to cover the most
common case for kexec -- kdump.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
Reviewed-by: Kuppuswamy Sathyanarayanan
---
arch/x86/kernel/acpi/madt_wakeup.c | 22 ++
1 file changed, 22 insertions(+)
diff --git
it.
Keep track of the number of shared pages. This will allow for
cross-checking against the shared information in the direct mapping and
reporting if the shared bit is lost.
Include a debugfs interface that allows for the check to be performed at
any point.
Signed-off-by: Kirill A. Shutemov
---
arch
cause
> cpus are not resettable like kexec reboot does. Not sure if this is seen
> in your test.
Yes. It is the same reboot limitation I've mentioned before.
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
t.github.com/kiryl/e1dc1719e0c990b3ceee5d8de8dbf332
> >
> Thanks a lot for providing the BIOS patch. One more question, is the
> patched BIOS image for the host physical machine or for the tdx guest
> vm?
For the guest.
--
Kiryl Shutsemau / Kirill A. Shutemov
d you
to tested before, right? If not, failure is expected.
> 3) not sure if this is particular case on the system we tested on.
--
Kiryl Shutsemau / Kirill A. Shutemov
___
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
On Thu, Nov 16, 2023 at 10:45:23PM +0800, Baoquan He wrote:
> On 11/16/23 at 10:17pm, Baoquan He wrote:
> > On 11/16/23 at 03:56pm, Kirill A. Shutemov wrote:
> > > On Thu, Nov 16, 2023 at 08:10:47PM +0800, Baoquan He wrote:
> > > > On 11/15/23 at 03:
On Thu, Nov 16, 2023 at 08:10:47PM +0800, Baoquan He wrote:
> On 11/15/23 at 03:00pm, Kirill A. Shutemov wrote:
> > The patchset adds bits and pieces to get kexec (and crashkernel) work on
> > TDX guest.
>
> I finally got a machine of intel-eaglestream-spr as host and built
: 0x8110687c (kvmclock_disable+0x1c/0x30)
kvmclock enabling is gated by CLOCKSOURCE and CLOCKSOURCE2 KVM paravirt
features.
Do not disable kvmclock if it was not enabled.
Signed-off-by: Kirill A. Shutemov
Fixes: c02027b5742b ("x86/kvm: Disable kvmclock on all CPUs on shutdown")
Reviewe
On Wed, Nov 15, 2023 at 01:23:43PM +0100, Peter Zijlstra wrote:
> On Wed, Nov 15, 2023 at 03:00:36PM +0300, Kirill A. Shutemov wrote:
> > TDX guests are not allowed to clear CR4.MCE. Attempt to clear it leads
> > to #VE.
> >
> > Use alternatives to keep the flag
by
one PGD entry in 5-level paging mode.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Rick Edgecombe
---
arch/x86/include/asm/pgtable_types.h | 1 +
arch/x86/mm/pat/set_memory.c | 8
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm
private mapping is fatal. It leads to
unrecoverable TD exit.
On kexec walk direct mapping and convert all shared memory back to
private. It makes all RAM private again and second kernel may use it
normally.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/coco/tdx/kexec.c | 0
arch/x86
-off-by: Kirill A. Shutemov
Link: https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher
---
arch/x86/kernel/acpi/Makefile| 2 +-
arch/x86/kernel/acpi/boot.c | 2 +
arch/x86/kernel/acpi/madt_playdead.S | 21 ++
arch/x86/kernel/acpi/madt_wakeup.c | 332
it.
Keep track of the number of shared pages. This will allow for
cross-checking against the shared information in the direct mapping and
reporting if the shared bit is lost.
Include a debugfs interface that allows for the check to be performed at
any point.
Signed-off-by: Kirill A. Shutemov
---
arch
kernel with signle CPU is enough to cover the most
common case for kexec -- kdump.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
---
arch/x86/kernel/acpi/madt_wakeup.c | 22 ++
1 file changed, 22 insertions(+)
diff --git a/arch/x86/kernel/acpi/madt_wakeup.c
b/arch
confusion.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
Reviewed-by: Kuppuswamy Sathyanarayanan
---
arch/x86/kernel/acpi/madt_wakeup.c | 2 +-
include/acpi/actbl2.h | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/acpi/madt_wakeup.c
-by: Kirill A. Shutemov
---
arch/x86/coco/core.c | 1 -
arch/x86/kernel/acpi/madt_wakeup.c | 3 +++
include/linux/cc_platform.h| 10 --
kernel/cpu.c | 3 +--
4 files changed, 4 insertions(+), 13 deletions(-)
diff --git a/arch/x86/coco/core.c b/arch
guest. TDX
guest uses E820_TYPE_ACPI to store the unaccepted memory bitmap and pass
it between the kernels on kexec.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/kernel/e820.c | 9 +
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820
acpi_mp_wake_mailbox_paddr and acpi_mp_wake_mailbox initialized once
during ACPI MADT init and never changed.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/kernel/acpi/madt_wakeup.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/acpi/madt_wakeup.c
b
for ACPI
MADT.
Signed-off-by: Kirill A. Shutemov
---
include/linux/cpu.h | 2 ++
kernel/cpu.c| 13 -
2 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index fc8094419084..46f2e34a0c5e 100644
--- a/include/linux/cpu.h
TDX is going to have more than one reason to fail
enc_status_change_prepare().
Change the callback to return errno instead of assuming -EIO;
enc_status_change_finish() changed too to keep the interface symmetric.
Signed-off-by: Kirill A. Shutemov
---
arch/x86/coco/tdx/tdx.c | 20
In order to prepare for the expansion of support for the ACPI MADT
wakeup method, move the relevant code into a separate file.
Introduce a new configuration option to clearly indicate dependencies
without the use of ifdefs.
There have been no functional changes.
Signed-off-by: Kirill
ent acpi_mp_play_dead();
- cond_resched() in tdx_shared_memory_show();
- s/target kernel/second kernel/;
- Update commit messages and comments;
[1] https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher
Kirill A. Shutemov (14):
x86/acpi: Extract ACPI MADT wakeup code into a separate file
TDX guests are not allowed to clear CR4.MCE. Attempt to clear it leads
to #VE.
Use alternatives to keep the flag during kexec for TDX guests.
The change doesn't affect non-TDX-guest environments.
Signed-off-by: Kirill A. Shutemov
Reviewed-by: Kai Huang
---
arch/x86/kernel/relocate_kernel_64
On Sun, Oct 29, 2023 at 06:31:36PM +0100, Thomas Gleixner wrote:
> On Fri, Oct 20 2023 at 18:12, Kirill A. Shutemov wrote:
>
> > MADT Multiprocessor Wakeup structure version 1 brings support of CPU
> > offlining: BIOS provides a reset vector where the CPU has to jump to
On Sat, Oct 28, 2023 at 04:12:10PM +0200, Thomas Gleixner wrote:
> On Fri, Oct 20 2023 at 18:12, Kirill A. Shutemov wrote:
>
> Subject: cpu/hotplug: ...
>
> > ACPI MADT doesn't allow to offline CPU after it got woke up.
>
> ACPI MADT is a table ...
>
> This is
On Tue, Oct 24, 2023 at 06:59:58AM -0700, Kuppuswamy Sathyanarayanan wrote:
>
>
> On 10/20/2023 8:12 AM, Kirill A. Shutemov wrote:
> > ACPI MADT doesn't allow to offline CPU after it got woke up. It limits
> > kexec: the second kernel won't be able to use more than
() to implement acpi_mp_play_dead();
- cond_resched() in tdx_shared_memory_show();
- s/target kernel/second kernel/;
- Update commit messages and comments;
[1] https://lore.kernel.org/all/13356251.uLZWGnKmhe@kreacher
Kirill A. Shutemov (13):
x86/acpi: Extract ACPI MADT wakeup code into a separate
1 - 100 of 190 matches
Mail list logo
