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2b4b90e053
Currently, the secondary CPUs in Hyper-V VTL context lack support for
parallel startup. Therefore, relying on the single initial_stack fetched
from the current task structure suffices for all vCPUs.
However, common initial_stack risks stack corruption when parallel startup
is enabled. In order to facilitate parallel startup, use the initial_stack
from the per CPU idle thread instead of the current task.
Fixes: 3be1bc2fe9 ("x86/hyperv: VTL support for Hyper-V")
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1709452896-13342-1-git-send-email-ssengar@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <1709452896-13342-1-git-send-email-ssengar@linux.microsoft.com>
59 lines
1.8 KiB
Plaintext
59 lines
1.8 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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menu "Microsoft Hyper-V guest support"
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config HYPERV
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tristate "Microsoft Hyper-V client drivers"
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depends on (X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
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|| (ACPI && ARM64 && !CPU_BIG_ENDIAN)
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select PARAVIRT
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select X86_HV_CALLBACK_VECTOR if X86
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select OF_EARLY_FLATTREE if OF
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help
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Select this option to run Linux as a Hyper-V client operating
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system.
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config HYPERV_VTL_MODE
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bool "Enable Linux to boot in VTL context"
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depends on X86_64 && HYPERV
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depends on SMP
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default n
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help
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Virtual Secure Mode (VSM) is a set of hypervisor capabilities and
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enlightenments offered to host and guest partitions which enables
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the creation and management of new security boundaries within
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operating system software.
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VSM achieves and maintains isolation through Virtual Trust Levels
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(VTLs). Virtual Trust Levels are hierarchical, with higher levels
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being more privileged than lower levels. VTL0 is the least privileged
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level, and currently only other level supported is VTL2.
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Select this option to build a Linux kernel to run at a VTL other than
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the normal VTL0, which currently is only VTL2. This option
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initializes the x86 platform for VTL2, and adds the ability to boot
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secondary CPUs directly into 64-bit context as required for VTLs other
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than 0. A kernel built with this option must run at VTL2, and will
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not run as a normal guest.
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If unsure, say N
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config HYPERV_TIMER
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def_bool HYPERV && X86
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config HYPERV_UTILS
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tristate "Microsoft Hyper-V Utilities driver"
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depends on HYPERV && CONNECTOR && NLS
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depends on PTP_1588_CLOCK_OPTIONAL
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help
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Select this option to enable the Hyper-V Utilities.
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config HYPERV_BALLOON
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tristate "Microsoft Hyper-V Balloon driver"
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depends on HYPERV
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select PAGE_REPORTING
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help
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Select this option to enable Hyper-V Balloon driver.
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endmenu
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