From: "Rafael J. Wysocki" <rafael@kernel.org>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Robert Moore <robert.moore@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
Andi Kleen <ak@linux.intel.com>, Borislav Petkov <bp@alien8.de>,
Dan Williams <dan.j.williams@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Tony Luck <tony.luck@intel.com>,
"the arch/x86 maintainers" <x86@kernel.org>
Subject: Re: [PATCH 1/4] ACPICA: Do not flush cache for on entering S4 and S5
Date: Wed, 8 Dec 2021 15:58:26 +0100 [thread overview]
Message-ID: <CAJZ5v0g4bCYJHrbWXrQWwhYa9QNCAFfia4gB6e7PWWXeuVycAQ@mail.gmail.com> (raw)
In-Reply-To: <20211206122952.74139-2-kirill.shutemov@linux.intel.com>
On Mon, Dec 6, 2021 at 1:30 PM Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> According to the ACPI spec v6.4, section 16.2 the cache flushing is
> required on entering to S1, S2, and S3. ACPICA code flushes 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
> fixes the issue.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
I've converted this patch to the upstream ACPICA code base format and
submitted a pull request with it to the upstream project.
Thanks!
> ---
> drivers/acpi/acpica/hwesleep.c | 3 ++-
> drivers/acpi/acpica/hwsleep.c | 3 ++-
> drivers/acpi/acpica/hwxfsleep.c | 2 --
> 3 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/acpi/acpica/hwesleep.c b/drivers/acpi/acpica/hwesleep.c
> index 808fdf54aeeb..ceb5a4292efa 100644
> --- a/drivers/acpi/acpica/hwesleep.c
> +++ b/drivers/acpi/acpica/hwesleep.c
> @@ -104,7 +104,8 @@ 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) {
> diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
> index 34a3825f25d3..ee094a3aaaab 100644
> --- a/drivers/acpi/acpica/hwsleep.c
> +++ b/drivers/acpi/acpica/hwsleep.c
> @@ -110,7 +110,8 @@ 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) {
> diff --git a/drivers/acpi/acpica/hwxfsleep.c b/drivers/acpi/acpica/hwxfsleep.c
> index e4cde23a2906..ba77598ee43e 100644
> --- a/drivers/acpi/acpica/hwxfsleep.c
> +++ b/drivers/acpi/acpica/hwxfsleep.c
> @@ -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)) {
> --
> 2.32.0
>
next prev parent reply other threads:[~2021-12-08 14:58 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <YZPbQVwWOJCrAH78@zn.tnic>
2021-11-19 4:03 ` [PATCH v2] x86: Skip WBINVD instruction for VM guest Kuppuswamy Sathyanarayanan
2021-11-25 0:40 ` Thomas Gleixner
2021-12-02 22:21 ` Kirill A. Shutemov
2021-12-02 22:38 ` Dave Hansen
2021-12-02 23:48 ` Thomas Gleixner
2021-12-03 23:49 ` Kirill A. Shutemov
2021-12-04 0:20 ` Dave Hansen
2021-12-04 0:54 ` Kirill A. Shutemov
2021-12-06 15:35 ` Dave Hansen
2021-12-06 16:39 ` Dan Williams
2021-12-06 16:53 ` Dave Hansen
2021-12-06 17:51 ` Dan Williams
2021-12-04 20:27 ` Rafael J. Wysocki
2021-12-06 12:29 ` [PATCH 0/4] ACPI/ACPICA: Only flush caches on S1/S2/S3 and C3 Kirill A. Shutemov
2021-12-06 12:29 ` [PATCH 1/4] ACPICA: Do not flush cache for on entering S4 and S5 Kirill A. Shutemov
2021-12-08 14:58 ` Rafael J. Wysocki [this message]
2021-12-06 12:29 ` [PATCH 2/4] ACPI: PM: Remove redundant cache flushing Kirill A. Shutemov
2021-12-07 16:35 ` Rafael J. Wysocki
2021-12-09 13:32 ` Kirill A. Shutemov
2021-12-17 18:04 ` Rafael J. Wysocki
2021-12-06 12:29 ` [PATCH 3/4] ACPI: processor idle: Only flush cache on entering C3 Kirill A. Shutemov
2021-12-06 15:03 ` Peter Zijlstra
2021-12-08 16:26 ` Rafael J. Wysocki
2021-12-09 13:33 ` Kirill A. Shutemov
2021-12-17 17:58 ` Rafael J. Wysocki
2021-12-06 12:29 ` [PATCH 4/4] ACPI: PM: Avoid cache flush on entering S4 Kirill A. Shutemov
2021-12-08 15:10 ` Rafael J. Wysocki
2021-12-08 16:04 ` Kirill A. Shutemov
2021-12-08 16:16 ` Rafael J. Wysocki
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