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x86/platform/UV: Use efi_runtime_lock to serialise BIOS calls 

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
This commit is contained in:
Hedi Berriche 2019-02-13 19:34:13 +00:00 committed by Borislav Petkov
parent 8cd8f0ce0d
commit f331e766c4
3 changed files with 35 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/include/asm/uv/bios.h
View File

@ -48,7 +48,8 @@ enum {
BIOS_STATUS_SUCCESS = 0,
BIOS_STATUS_UNIMPLEMENTED = -ENOSYS,
BIOS_STATUS_EINVAL = -EINVAL,
BIOS_STATUS_UNAVAIL = -EBUSY
BIOS_STATUS_UNAVAIL = -EBUSY,
BIOS_STATUS_ABORT = -EINTR,
};
/* Address map parameters */
@ -167,4 +168,9 @@ extern long system_serial_number;
extern struct kobject *sgi_uv_kobj; /* /sys/firmware/sgi_uv */
/*
* EFI runtime lock; cf. firmware/efi/runtime-wrappers.c for details
*/
extern struct semaphore __efi_uv_runtime_lock;
#endif /* _ASM_X86_UV_BIOS_H */

23
arch/x86/platform/uv/bios_uv.c
View File

@ -29,7 +29,8 @@
struct uv_systab *uv_systab;
s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
static s64 __uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
u64 a4, u64 a5)
{
struct uv_systab *tab = uv_systab;
s64 ret;
@ -51,6 +52,19 @@ s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
return ret;
}
s64 uv_bios_call(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3, u64 a4, u64 a5)
{
s64 ret;
if (down_interruptible(&__efi_uv_runtime_lock))
return BIOS_STATUS_ABORT;
ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
up(&__efi_uv_runtime_lock);
return ret;
}
EXPORT_SYMBOL_GPL(uv_bios_call);
s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
@ -59,10 +73,15 @@ s64 uv_bios_call_irqsave(enum uv_bios_cmd which, u64 a1, u64 a2, u64 a3,
unsigned long bios_flags;
s64 ret;
if (down_interruptible(&__efi_uv_runtime_lock))
return BIOS_STATUS_ABORT;
local_irq_save(bios_flags);
ret = uv_bios_call(which, a1, a2, a3, a4, a5);
ret = __uv_bios_call(which, a1, a2, a3, a4, a5);
local_irq_restore(bios_flags);
up(&__efi_uv_runtime_lock);
return ret;
}

7
drivers/firmware/efi/runtime-wrappers.c
View File

@ -146,6 +146,13 @@ 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.