From: Nicholas Piggin <npiggin@gmail.com>
To: Thomas Huth <thuth@redhat.com>
Cc: Nicholas Piggin <npiggin@gmail.com>,
Laurent Vivier <lvivier@redhat.com>,
Andrew Jones <andrew.jones@linux.dev>,
linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org
Subject: [kvm-unit-tests PATCH v9 14/31] powerpc: Remove broken SMP exception stack setup
Date: Sat, 4 May 2024 22:28:20 +1000 [thread overview]
Message-ID: <20240504122841.1177683-15-npiggin@gmail.com> (raw)
In-Reply-To: <20240504122841.1177683-1-npiggin@gmail.com>
The exception stack setup does not work correctly for SMP, because
it is the boot processor that calls cpu_set() which sets SPRG2 to
the exception stack, not the target CPU itself. So secondaries
never got their SPRG2 set to a valid exception stack.
Remove the SMP code and just set an exception stack for the boot
processor. Make the stack 64kB while we're here, to match the
size of the regular stack.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
lib/powerpc/setup.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/lib/powerpc/setup.c b/lib/powerpc/setup.c
index 9b665f59c..58be93f08 100644
--- a/lib/powerpc/setup.c
+++ b/lib/powerpc/setup.c
@@ -42,10 +42,6 @@ struct cpu_set_params {
uint64_t tb_hz;
};
-#define EXCEPTION_STACK_SIZE (32*1024) /* 32kB */
-
-static char exception_stack[NR_CPUS][EXCEPTION_STACK_SIZE];
-
static void cpu_set(int fdtnode, u64 regval, void *info)
{
static bool read_common_info = false;
@@ -56,10 +52,6 @@ static void cpu_set(int fdtnode, u64 regval, void *info)
cpus[cpu] = regval;
- /* set exception stack address for this CPU (in SPGR0) */
- asm volatile ("mtsprg0 %[addr]" ::
- [addr] "r" (exception_stack[cpu + 1]));
-
if (!read_common_info) {
const struct fdt_property *prop;
u32 *data;
@@ -180,6 +172,10 @@ static void mem_init(phys_addr_t freemem_start)
? __icache_bytes : __dcache_bytes);
}
+#define EXCEPTION_STACK_SIZE SZ_64K
+
+static char boot_exception_stack[EXCEPTION_STACK_SIZE];
+
void setup(const void *fdt)
{
void *freemem = &stacktop;
@@ -189,6 +185,10 @@ void setup(const void *fdt)
cpu_has_hv = !!(mfmsr() & (1ULL << MSR_HV_BIT));
+ /* set exception stack address for this CPU (in SPGR0) */
+ asm volatile ("mtsprg0 %[addr]" ::
+ [addr] "r" (boot_exception_stack + EXCEPTION_STACK_SIZE - 64));
+
enable_mcheck();
/*
--
2.43.0
next prev parent reply other threads:[~2024-05-04 12:29 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-04 12:28 [kvm-unit-tests PATCH v9 00/31] powerpc improvements Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 01/31] doc: update unittests doc Nicholas Piggin
2024-05-06 7:03 ` Thomas Huth
2024-05-07 3:57 ` Nicholas Piggin
2024-05-06 8:02 ` Andrew Jones
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 02/31] report: Add known failure reporting option Nicholas Piggin
2024-05-06 7:25 ` Thomas Huth
2024-05-06 8:01 ` Andrew Jones
2024-05-06 10:19 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 03/31] powerpc: Mark known failing tests as kfail Nicholas Piggin
2024-05-06 7:37 ` Thomas Huth
2024-05-07 4:07 ` Nicholas Piggin
2024-05-07 11:44 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 04/31] powerpc: Update unittests for latest QEMU version Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 05/31] powerpc/sprs: Specify SPRs with data rather than code Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 06/31] powerpc/sprs: Avoid taking PMU interrupts caused by register fuzzing Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 07/31] scripts: allow machine option to be specified in unittests.cfg Nicholas Piggin
2024-05-07 15:08 ` Thomas Huth
2024-05-08 12:27 ` Nicholas Piggin
2024-05-08 12:55 ` Thomas Huth
2024-05-08 12:58 ` Thomas Huth
2024-05-08 13:36 ` Thomas Huth
2024-05-09 5:44 ` Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 08/31] scripts: Accommodate powerpc powernv machine differences Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 09/31] powerpc: Support powernv machine with QEMU TCG Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 10/31] powerpc: Fix emulator illegal instruction test for powernv Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 11/31] powerpc/sprs: Test hypervisor registers on powernv machine Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 12/31] powerpc: general interrupt tests Nicholas Piggin
2024-05-07 12:12 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 13/31] powerpc: Add rtas stop-self support Nicholas Piggin
2024-05-04 12:28 ` Nicholas Piggin [this message]
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 15/31] powerpc: Enable page alloc operations Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 16/31] powerpc: add SMP and IPI support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 17/31] powerpc: Add cpu_relax Nicholas Piggin
2024-05-07 13:44 ` Thomas Huth
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 18/31] powerpc: Permit ACCEL=tcg,thread=single Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 19/31] powerpc: Avoid using larx/stcx. in spinlocks when only one CPU is running Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 20/31] powerpc: Add atomics tests Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 21/31] powerpc: Add timebase tests Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 22/31] powerpc: Add MMU support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 23/31] common/sieve: Use vmalloc.h for setup_mmu definition Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 24/31] common/sieve: Support machines without MMU Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 25/31] powerpc: Add sieve.c common test Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 26/31] powerpc: add usermode support Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 27/31] powerpc: add pmu tests Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 28/31] configure: Make arch_libdir a first-class entity Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 29/31] powerpc: Remove remnants of ppc64 directory and build structure Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 30/31] powerpc: Add facility to query TCG or KVM host Nicholas Piggin
2024-05-04 12:28 ` [kvm-unit-tests PATCH v9 31/31] powerpc: gitlab CI update Nicholas Piggin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240504122841.1177683-15-npiggin@gmail.com \
--to=npiggin@gmail.com \
--cc=andrew.jones@linux.dev \
--cc=kvm@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=lvivier@redhat.com \
--cc=thuth@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).