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Kirill A. Shutemov 9da7c9e920 ACPICA: Avoid cache flush inside virtual machines

[ Upstream commit e2efb6359e620521d1e13f69b2257de8ceaa9475 ]

While running inside virtual machine, the kernel can bypass cache
flushing. Changing sleep state in a virtual machine doesn't affect the
host system sleep state and cannot lead to data loss.

Before entering sleep states, the ACPI code flushes caches to prevent
data loss using the WBINVD instruction.  This mechanism is required on
bare metal.

But, any use WBINVD inside of a guest is worthless.  Changing sleep
state in a virtual machine doesn't affect the host system sleep state
and cannot lead to data loss, so most hypervisors simply ignore it.
Despite this, the ACPI code calls WBINVD unconditionally anyway.
It's useless, but also normally harmless.

In TDX guests, though, WBINVD stops being harmless; it triggers a
virtualization exception (#VE).  If the ACPI cache-flushing WBINVD
were left in place, TDX guests would need handling to recover from
the exception.

Avoid using WBINVD whenever running under a hypervisor.  This both
removes the useless WBINVDs and saves TDX from implementing WBINVD
handling.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-30-kirill.shutemov@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-06-14 16:52:28 +02:00

alpha

alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile

2021-10-06 10:23:40 +02:00

arc

ARC: entry: fix syscall_trace_exit argument

2022-04-27 13:14:11 +02:00

arm

ARM: 9197/1: spectre-bhb: fix loop8 sequence for Thumb2

2022-05-25 08:39:50 +02:00

arm64

arm64: module: remove (NOLOAD) from linker script