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Code Issues Releases Wiki Activity

ACPICA: Hardware: Do not flush CPU cache when entering S4 and S5

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[ Upstream commit 1d4e0b3abb ]

ACPICA commit 3dd7e1f3996456ef81bfe14cba29860e8d42949e

According to ACPI 6.4, Section 16.2, the CPU cache flushing is
required on entering to S1, S2, and S3, but the ACPICA code
flushes the CPU cache regardless of the sleep state.

Blind cache flush on entering S5 causes problems for TDX.

Flushing happens with WBINVD that is not supported in the TDX
environment.

TDX only supports S5 and adjusting ACPICA code to conform to the
spec more strictly fixes the issue.

Link: https://github.com/acpica/acpica/commit/3dd7e1f3
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2021-12-22 17:33:51 +01:00 committed by Greg Kroah-Hartman
parent a4c7a12027
commit dcedcbe177
3 changed files with 6 additions and 4 deletions
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4
drivers/acpi/acpica/hwesleep.c
View file

@ -104,7 +104,9 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
/* Flush caches, as per ACPI specification */
ACPI_FLUSH_CPU_CACHE();
if (sleep_state < ACPI_STATE_S4) {
ACPI_FLUSH_CPU_CACHE();
}
status = acpi_os_enter_sleep(sleep_state, sleep_control, 0);
if (status == AE_CTRL_TERMINATE) {

4
drivers/acpi/acpica/hwsleep.c
View file

@ -110,7 +110,9 @@ acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
/* Flush caches, as per ACPI specification */
ACPI_FLUSH_CPU_CACHE();
if (sleep_state < ACPI_STATE_S4) {
ACPI_FLUSH_CPU_CACHE();
}
status = acpi_os_enter_sleep(sleep_state, pm1a_control, pm1b_control);
if (status == AE_CTRL_TERMINATE) {

2
drivers/acpi/acpica/hwxfsleep.c
View file

@ -162,8 +162,6 @@ acpi_status acpi_enter_sleep_state_s4bios(void)
return_ACPI_STATUS(status);
}
ACPI_FLUSH_CPU_CACHE();
status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
(u32)acpi_gbl_FADT.s4_bios_request, 8);
if (ACPI_FAILURE(status)) {