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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-01-28 10:08:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-01-28 10:08:08 -0800 |
| commit | e5ff2cb9cf67a542f2ec7fb87e24934c88b32678 (patch) | |
| tree | f84294ec09eea320b5436137d80329a8a37485f4 /arch | |
| parent | 228345bf98cd78f91d007478a51f9a471489e44a (diff) | |
| parent | 2e92493637a09547734f92c62a2471f6f0cb9a2c (diff) | |
| download | linux-e5ff2cb9cf67a542f2ec7fb87e24934c88b32678.tar.bz2 | |
Merge tag 'for-linus-5.11-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
- A fix for a regression introduced in 5.11 resulting in Xen dom0
having problems to correctly initialize Xenstore.
- A fix for avoiding WARN splats when booting as Xen dom0 with
CONFIG_AMD_MEM_ENCRYPT enabled due to a missing trap handler for the
#VC exception (even if the handler should never be called).
- A fix for the Xen bklfront driver adapting to the correct but
unexpected behavior of new qemu.
* tag 'for-linus-5.11-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
x86/xen: avoid warning in Xen pv guest with CONFIG_AMD_MEM_ENCRYPT enabled
xen: Fix XenStore initialisation for XS_LOCAL
xen-blkfront: allow discard-* nodes to be optional
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/idtentry.h | 1 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten_pv.c | 15 | ||||
| -rw-r--r-- | arch/x86/xen/xen-asm.S | 1 |
3 files changed, 16 insertions, 1 deletions
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 247a60a47331..f656aabd1545 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -613,6 +613,7 @@ DECLARE_IDTENTRY_VC(X86_TRAP_VC, exc_vmm_communication); #ifdef CONFIG_XEN_PV DECLARE_IDTENTRY_XENCB(X86_TRAP_OTHER, exc_xen_hypervisor_callback); +DECLARE_IDTENTRY_RAW(X86_TRAP_OTHER, exc_xen_unknown_trap); #endif /* Device interrupts common/spurious */ diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 4409306364dc..9a5a50cdaab5 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -583,6 +583,13 @@ DEFINE_IDTENTRY_RAW(xenpv_exc_debug) exc_debug(regs); } +DEFINE_IDTENTRY_RAW(exc_xen_unknown_trap) +{ + /* This should never happen and there is no way to handle it. */ + pr_err("Unknown trap in Xen PV mode."); + BUG(); +} + struct trap_array_entry { void (*orig)(void); void (*xen)(void); @@ -631,6 +638,7 @@ static bool __ref get_trap_addr(void **addr, unsigned int ist) { unsigned int nr; bool ist_okay = false; + bool found = false; /* * Replace trap handler addresses by Xen specific ones. @@ -645,6 +653,7 @@ static bool __ref get_trap_addr(void **addr, unsigned int ist) if (*addr == entry->orig) { *addr = entry->xen; ist_okay = entry->ist_okay; + found = true; break; } } @@ -655,9 +664,13 @@ static bool __ref get_trap_addr(void **addr, unsigned int ist) nr = (*addr - (void *)early_idt_handler_array[0]) / EARLY_IDT_HANDLER_SIZE; *addr = (void *)xen_early_idt_handler_array[nr]; + found = true; } - if (WARN_ON(ist != 0 && !ist_okay)) + if (!found) + *addr = (void *)xen_asm_exc_xen_unknown_trap; + + if (WARN_ON(found && ist != 0 && !ist_okay)) return false; return true; diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S index 1cb0e84b9161..53cf8aa35032 100644 --- a/arch/x86/xen/xen-asm.S +++ b/arch/x86/xen/xen-asm.S @@ -178,6 +178,7 @@ xen_pv_trap asm_exc_simd_coprocessor_error #ifdef CONFIG_IA32_EMULATION xen_pv_trap entry_INT80_compat #endif +xen_pv_trap asm_exc_xen_unknown_trap xen_pv_trap asm_exc_xen_hypervisor_callback __INIT |