Date: Mon, 3 Jun 2019 11:53:12 +0200 From: Jan Martin Mikkelsen <janm@transactionware.com> To: Konstantin Belousov <kib@freebsd.org> Cc: Christian Ullrich <chris@chrullrich.net>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: efirtc causing panic (was Re: Panic booting 12-RC2 on amd64) Message-ID: <B6BA12DF-CFE3-44D9-B345-2331B2D829E9@transactionware.com> In-Reply-To: <20190531183519.GF27392@kib.kiev.ua> References: <6e985fa2-c372-67ef-1cd5-dd8894cca908@chrullrich.net> <187B6A1E-5C61-415A-A9F2-B4E3142375C7@transactionware.com> <7E738A9B-A0B6-49D3-86A8-8E2F9ED8A098@transactionware.com> <20190531183519.GF27392@kib.kiev.ua>
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Hi, This patch resolves the panic when booting without efi.rt.disabled=3D1 = for me. Thanks! Jan M. > On 31 May 2019, at 20:35, Konstantin Belousov <kib@freebsd.org> wrote: >=20 > On Fri, May 31, 2019 at 04:19:57PM +0200, Jan Martin Mikkelsen wrote: >> Hi, >>=20 >> Christian has pointed me at this = https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D233534 which he = raised after his email. The workaround was to boot with = =E2=80=9Cefi.rt.disabled=3D1=E2=80=9D.=20 >>=20 >> I took a closer look at what is going on. The problem is that the EFI = rt_gettime call is faulting, and the fault is handled in efirt_support.S = and a failure is reported. These messages is in the kernel output: >>=20 >> kernel trap 12 with interrupts disabled >> kernel trap 12 with interrupts disabled >> EFI rt_gettime call faulted, error 14 >> efirtc0: cannot read EFI realtime clock, error 14 >>=20 >> So far, so good. The problem is that that later in startup the = "smp_targeted_tlb_shootdown: interrupts disabled=E2=80=9D panic occurs, = if the SMP is enabled. With SMP disabled this does not occur and the = system runs. >>=20 >> I=E2=80=99m not sure whether this is a BIOS problem (seems likely) or = something that could handled after dealing with the fault in = efirt_support.S. >>=20 >> While looking I found the code below that looks wrong in efi_enter(), = but that is not the problem in this case. >>=20 >> Just adding this to the archive in case someone else looks more = closely later. >=20 > Try this. Only compile-time tested. >=20 > diff --git a/sys/amd64/amd64/efirt_support.S = b/sys/amd64/amd64/efirt_support.S > index cd578eddcfb..b54b13b01fe 100644 > --- a/sys/amd64/amd64/efirt_support.S > +++ b/sys/amd64/amd64/efirt_support.S > @@ -47,6 +47,9 @@ ENTRY(efi_rt_arch_call) > movq %r13, EC_R13(%rdi) > movq %r14, EC_R14(%rdi) > movq %r15, EC_R15(%rdi) > + pushfq > + popq %rax > + movq %rax, EC_RFLAGS(%rdi) > movq PCPU(CURTHREAD), %rax > movq %rdi, TD_MD+MD_EFIRT_TMP(%rax) > movq PCPU(CURPCB), %rsi > @@ -98,6 +101,8 @@ efi_rt_arch_call_tail: > movq EC_RBP(%rdi), %rbp > movq EC_RSP(%rdi), %rsp > movq EC_RBX(%rdi), %rbx > + pushq EC_RFLAGS(%rdi) > + popfq >=20 > popq %rbp > ret > diff --git a/sys/amd64/amd64/genassym.c b/sys/amd64/amd64/genassym.c > index de3969734a1..2e81b823262 100644 > --- a/sys/amd64/amd64/genassym.c > +++ b/sys/amd64/amd64/genassym.c > @@ -272,3 +272,4 @@ ASSYM(EC_R12, offsetof(struct efirt_callinfo, = ec_r12)); > ASSYM(EC_R13, offsetof(struct efirt_callinfo, ec_r13)); > ASSYM(EC_R14, offsetof(struct efirt_callinfo, ec_r14)); > ASSYM(EC_R15, offsetof(struct efirt_callinfo, ec_r15)); > +ASSYM(EC_RFLAGS, offsetof(struct efirt_callinfo, ec_rflags)); > diff --git a/sys/amd64/include/efi.h b/sys/amd64/include/efi.h > index 082223792ac..e630a338c17 100644 > --- a/sys/amd64/include/efi.h > +++ b/sys/amd64/include/efi.h > @@ -72,6 +72,7 @@ struct efirt_callinfo { > register_t ec_r13; > register_t ec_r14; > register_t ec_r15; > + register_t ec_rflags; > }; >=20 > #endif /* __AMD64_INCLUDE_EFI_H_ */ > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org"
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