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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-25 15:37:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-25 15:37:31 -0700
commit5739844347518a0f4c327ae79e73fb101d864726 (patch)
tree69669d6c415985408cea12fbeac8b8ea7b268d31 /arch
parent90316e6ea0f0d63dab4cc84f71a8e199ee4b9b6c (diff)
parent0594c58161b6e0f3da8efa9c6e3d4ba52b652717 (diff)
Merge tag 'for-linus-5.15b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross: "Some minor cleanups and fixes of some theoretical bugs, as well as a fix of a bug introduced in 5.15-rc1" * tag 'for-linus-5.15b-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/x86: fix PV trap handling on secondary processors xen/balloon: fix balloon kthread freezing swiotlb-xen: this is PV-only on x86 xen/pci-swiotlb: reduce visibility of symbols PCI: only build xen-pcifront in PV-enabled environments swiotlb-xen: ensure to issue well-formed XENMEM_exchange requests Xen/gntdev: don't ignore kernel unmapping error xen/x86: drop redundant zeroing from cpu_initialize_context()
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--arch/x86/include/asm/xen/swiotlb-xen.h6
-rw-r--r--arch/x86/xen/enlighten_pv.c15
-rw-r--r--arch/x86/xen/pci-swiotlb-xen.c4
-rw-r--r--arch/x86/xen/smp_pv.c4
5 files changed, 12 insertions, 18 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dad7f85dcdea..ab83c22d274e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2610,7 +2610,6 @@ config PCI_OLPC
config PCI_XEN
def_bool y
depends on PCI && XEN
- select SWIOTLB_XEN
config MMCONF_FAM10H
def_bool y
diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h
index 6b56d0d45d15..66b4ddde7743 100644
--- a/arch/x86/include/asm/xen/swiotlb-xen.h
+++ b/arch/x86/include/asm/xen/swiotlb-xen.h
@@ -3,14 +3,10 @@
#define _ASM_X86_SWIOTLB_XEN_H
#ifdef CONFIG_SWIOTLB_XEN
-extern int xen_swiotlb;
extern int __init pci_xen_swiotlb_detect(void);
-extern void __init pci_xen_swiotlb_init(void);
extern int pci_xen_swiotlb_init_late(void);
#else
-#define xen_swiotlb (0)
-static inline int __init pci_xen_swiotlb_detect(void) { return 0; }
-static inline void __init pci_xen_swiotlb_init(void) { }
+#define pci_xen_swiotlb_detect NULL
static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; }
#endif
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 349f780a1567..6e0d0754f94f 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -755,8 +755,8 @@ static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
preempt_enable();
}
-static void xen_convert_trap_info(const struct desc_ptr *desc,
- struct trap_info *traps)
+static unsigned xen_convert_trap_info(const struct desc_ptr *desc,
+ struct trap_info *traps, bool full)
{
unsigned in, out, count;
@@ -766,17 +766,18 @@ static void xen_convert_trap_info(const struct desc_ptr *desc,
for (in = out = 0; in < count; in++) {
gate_desc *entry = (gate_desc *)(desc->address) + in;
- if (cvt_gate_to_trap(in, entry, &traps[out]))
+ if (cvt_gate_to_trap(in, entry, &traps[out]) || full)
out++;
}
- traps[out].address = 0;
+
+ return out;
}
void xen_copy_trap_info(struct trap_info *traps)
{
const struct desc_ptr *desc = this_cpu_ptr(&idt_desc);
- xen_convert_trap_info(desc, traps);
+ xen_convert_trap_info(desc, traps, true);
}
/* Load a new IDT into Xen. In principle this can be per-CPU, so we
@@ -786,6 +787,7 @@ static void xen_load_idt(const struct desc_ptr *desc)
{
static DEFINE_SPINLOCK(lock);
static struct trap_info traps[257];
+ unsigned out;
trace_xen_cpu_load_idt(desc);
@@ -793,7 +795,8 @@ static void xen_load_idt(const struct desc_ptr *desc)
memcpy(this_cpu_ptr(&idt_desc), desc, sizeof(idt_desc));
- xen_convert_trap_info(desc, traps);
+ out = xen_convert_trap_info(desc, traps, false);
+ memset(&traps[out], 0, sizeof(traps[0]));
xen_mc_flush();
if (HYPERVISOR_set_trap_table(traps))
diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
index 54f9aa7e8457..46df59aeaa06 100644
--- a/arch/x86/xen/pci-swiotlb-xen.c
+++ b/arch/x86/xen/pci-swiotlb-xen.c
@@ -18,7 +18,7 @@
#endif
#include <linux/export.h>
-int xen_swiotlb __read_mostly;
+static int xen_swiotlb __read_mostly;
/*
* pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
@@ -56,7 +56,7 @@ int __init pci_xen_swiotlb_detect(void)
return xen_swiotlb;
}
-void __init pci_xen_swiotlb_init(void)
+static void __init pci_xen_swiotlb_init(void)
{
if (xen_swiotlb) {
xen_swiotlb_init_early();
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index 96afadf9878e..7ed56c6075b0 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -290,8 +290,6 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
gdt = get_cpu_gdt_rw(cpu);
- memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
-
/*
* Bring up the CPU in cpu_bringup_and_idle() with the stack
* pointing just below where pt_regs would be if it were a normal
@@ -308,8 +306,6 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
xen_copy_trap_info(ctxt->trap_ctxt);
- ctxt->ldt_ents = 0;
-
BUG_ON((unsigned long)gdt & ~PAGE_MASK);
gdt_mfn = arbitrary_virt_to_mfn(gdt);

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