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| author | Hedi Berriche <hedi.berriche@hpe.com> | 2019-02-13 22:34:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-20 12:25:48 +0300 |
| commit | cdc356855685e52c23d208fdd49308da1d545f91 (patch) | |
| tree | 2f87922f1cab75e1f8248b6274785f8086c8505b /drivers/firmware | |
| parent | 45649b999632ab7ef13b6b93e837f35107cbe240 (diff) | |
| download | linux-cdc356855685e52c23d208fdd49308da1d545f91.tar.xz | |
x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls
commit f331e766c4be33f4338574f3c9f7f77e98ab4571 upstream.
Calls into UV firmware must be protected against concurrency, expose the
efi_runtime_lock to the UV platform, and use it to serialise UV BIOS
calls.
Signed-off-by: Hedi Berriche <hedi.berriche@hpe.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Russ Anderson <rja@hpe.com>
Reviewed-by: Dimitri Sivanich <sivanich@hpe.com>
Reviewed-by: Mike Travis <mike.travis@hpe.com>
Cc: Andy Shevchenko <andy@infradead.org>
Cc: Bhupesh Sharma <bhsharma@redhat.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-efi <linux-efi@vger.kernel.org>
Cc: platform-driver-x86@vger.kernel.org
Cc: stable@vger.kernel.org # v4.9+
Cc: Steve Wahl <steve.wahl@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190213193413.25560-5-hedi.berriche@hpe.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/runtime-wrappers.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c index aa66cbf23512..b0aeffd4e269 100644 --- a/drivers/firmware/efi/runtime-wrappers.c +++ b/drivers/firmware/efi/runtime-wrappers.c @@ -173,6 +173,13 @@ void efi_call_virt_check_flags(unsigned long flags, const char *call) static DEFINE_SEMAPHORE(efi_runtime_lock); /* + * Expose the EFI runtime lock to the UV platform + */ +#ifdef CONFIG_X86_UV +extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock); +#endif + +/* * Calls the appropriate efi_runtime_service() with the appropriate * arguments. * |