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Miscellaneous x86 fixes:

Browse Source 
- Improve Qemu MCE-injection behavior by only using
    AMD SMCA MSRs if the feature bit is set.
 
  - Fix the relative path of gettimeofday.c inclusion
    in vclock_gettime.c
 
  - Fix a boot crash on UV clusters when a socket is
    marked as 'deconfigured' which are mapped to the
    SOCK_EMPTY (0xffff [short -1]) node ID by the UV firmware,
    while Linux APIs expect NUMA_NO_NODE (0xffffffff [int -1]).
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:

 - Improve Qemu MCE-injection behavior by only using AMD SMCA MSRs if
   the feature bit is set

 - Fix the relative path of gettimeofday.c inclusion in vclock_gettime.c

 - Fix a boot crash on UV clusters when a socket is marked as
   'deconfigured' which are mapped to the SOCK_EMPTY node ID by
   the UV firmware, while Linux APIs expect NUMA_NO_NODE.

   The difference being (0xffff [unsigned short ~0]) vs [int -1]

* tag 'x86-urgent-2026-03-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/platform/uv: Handle deconfigured sockets
  x86/entry/vdso: Fix path of included gettimeofday.c
  x86/mce/amd: Check SMCA feature bit before accessing SMCA MSRs
This commit is contained in:
Linus Torvalds 2026-03-22 10:54:12 -07:00
commit 8d8bd2a5aa
3 changed files with 28 additions and 9 deletions
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2
arch/x86/entry/vdso/common/vclock_gettime.c
View File

@ -13,7 +13,7 @@
#include <linux/types.h>
#include <vdso/gettime.h>
#include "../../../../lib/vdso/gettimeofday.c"
#include "lib/vdso/gettimeofday.c"
int __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
{

18
arch/x86/kernel/apic/x2apic_uv_x.c
View File

@ -1708,8 +1708,22 @@ static void __init uv_system_init_hub(void)
struct uv_hub_info_s *new_hub;
/* Allocate & fill new per hub info list */
new_hub = (bid == 0) ? &uv_hub_info_node0
: kzalloc_node(bytes, GFP_KERNEL, uv_blade_to_node(bid));
if (bid == 0) {
new_hub = &uv_hub_info_node0;
} else {
int nid;
/*
* Deconfigured sockets are mapped to SOCK_EMPTY. Use
* NUMA_NO_NODE to allocate on a valid node.
*/
nid = uv_blade_to_node(bid);
if (nid == SOCK_EMPTY)
nid = NUMA_NO_NODE;
new_hub = kzalloc_node(bytes, GFP_KERNEL, nid);
}
if (WARN_ON_ONCE(!new_hub)) {
/* do not kfree() bid 0, which is statically allocated */
while (--bid > 0)

17
arch/x86/kernel/cpu/mce/amd.c
View File

@ -875,13 +875,18 @@ void amd_clear_bank(struct mce *m)
{
amd_reset_thr_limit(m->bank);
/* Clear MCA_DESTAT for all deferred errors even those logged in MCA_STATUS. */
if (m->status & MCI_STATUS_DEFERRED)
mce_wrmsrq(MSR_AMD64_SMCA_MCx_DESTAT(m->bank), 0);
if (mce_flags.smca) {
/*
* Clear MCA_DESTAT for all deferred errors even those
* logged in MCA_STATUS.
*/
if (m->status & MCI_STATUS_DEFERRED)
mce_wrmsrq(MSR_AMD64_SMCA_MCx_DESTAT(m->bank), 0);
/* Don't clear MCA_STATUS if MCA_DESTAT was used exclusively. */
if (m->kflags & MCE_CHECK_DFR_REGS)
return;
/* Don't clear MCA_STATUS if MCA_DESTAT was used exclusively. */
if (m->kflags & MCE_CHECK_DFR_REGS)
return;
}
mce_wrmsrq(mca_msr_reg(m->bank, MCA_STATUS), 0);
}