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Merge branch 'acpi-apei'

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* acpi-apei: (29 commits)
  efi: cper: Fix possible out-of-bounds access
  ACPI: APEI: Fix possible out-of-bounds access to BERT region
  MAINTAINERS: Add James Morse to the list of APEI reviewers
  ACPI / APEI: Add support for the SDEI GHES Notification type
  firmware: arm_sdei: Add ACPI GHES registration helper
  ACPI / APEI: Use separate fixmap pages for arm64 NMI-like notifications
  ACPI / APEI: Only use queued estatus entry during in_nmi_queue_one_entry()
  ACPI / APEI: Split ghes_read_estatus() to allow a peek at the CPER length
  ACPI / APEI: Make GHES estatus header validation more user friendly
  ACPI / APEI: Pass ghes and estatus separately to avoid a later copy
  ACPI / APEI: Let the notification helper specify the fixmap slot
  ACPI / APEI: Move locking to the notification helper
  arm64: KVM/mm: Move SEA handling behind a single 'claim' interface
  KVM: arm/arm64: Add kvm_ras.h to collect kvm specific RAS plumbing
  ACPI / APEI: Switch NOTIFY_SEA to use the estatus queue
  ACPI / APEI: Move NOTIFY_SEA between the estatus-queue and NOTIFY_NMI
  ACPI / APEI: Don't allow ghes_ack_error() to mask earlier errors
  ACPI / APEI: Generalise the estatus queue's notify code
  ACPI / APEI: Don't update struct ghes' flags in read/clear estatus
  ACPI / APEI: Remove spurious GHES_TO_CLEAR check
  ...
This commit is contained in:
Rafael J. Wysocki
2019-03-04 11:16:35 +01:00
parent 511514f1d9 45b14a4ffc
commit dcaed592b2
21 changed files with 598 additions and 375 deletions
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31
arch/arm64/kernel/acpi.c
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@@ -27,8 +27,10 @@
#include <linux/smp.h>
#include <linux/serial_core.h>
#include <acpi/ghes.h>
#include <asm/cputype.h>
#include <asm/cpu_ops.h>
#include <asm/daifflags.h>
#include <asm/pgtable.h>
#include <asm/smp_plat.h>
@@ -256,3 +258,32 @@ pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
return __pgprot(PROT_NORMAL_NC);
return __pgprot(PROT_DEVICE_nGnRnE);
}
/*
* Claim Synchronous External Aborts as a firmware first notification.
*
* Used by KVM and the arch do_sea handler.
* @regs may be NULL when called from process context.
*/
int apei_claim_sea(struct pt_regs *regs)
{
int err = -ENOENT;
unsigned long current_flags;
if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
return err;
current_flags = arch_local_save_flags();
/*
* SEA can interrupt SError, mask it and describe this as an NMI so
* that APEI defers the handling.
*/
local_daif_restore(DAIF_ERRCTX);
nmi_enter();
err = ghes_notify_sea();
nmi_exit();
local_daif_restore(current_flags);
return err;
}