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Re: [Xen-devel] [PATCH] x86/ioperm: add new paravirt function update_io_bitmap



Friendly ping...

On 18.02.20 16:47, Juergen Gross wrote:
Commit 111e7b15cf10f6 ("x86/ioperm: Extend IOPL config to control
ioperm() as well") reworked the iopl syscall to use I/O bitmaps.

Unfortunately this broke Xen PV domains using that syscall as there
is currently no I/O bitmap support in PV domains.

Add I/O bitmap support via a new paravirt function update_io_bitmap
which Xen PV domains can use to update their I/O bitmaps via a
hypercall.

Fixes: 111e7b15cf10f6 ("x86/ioperm: Extend IOPL config to control ioperm() as 
well")
Reported-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 5.5
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Tested-by: Jan Beulich <jbeulich@xxxxxxxx>
---
  arch/x86/include/asm/io_bitmap.h      |  9 ++++++++-
  arch/x86/include/asm/paravirt.h       |  7 +++++++
  arch/x86/include/asm/paravirt_types.h |  4 ++++
  arch/x86/kernel/paravirt.c            |  5 +++++
  arch/x86/kernel/process.c             |  2 +-
  arch/x86/xen/enlighten_pv.c           | 25 +++++++++++++++++++++++++
  6 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/io_bitmap.h b/arch/x86/include/asm/io_bitmap.h
index 02c6ef8f7667..07344d82e88e 100644
--- a/arch/x86/include/asm/io_bitmap.h
+++ b/arch/x86/include/asm/io_bitmap.h
@@ -19,7 +19,14 @@ struct task_struct;
  void io_bitmap_share(struct task_struct *tsk);
  void io_bitmap_exit(void);
-void tss_update_io_bitmap(void);
+void native_tss_update_io_bitmap(void);
+
+#ifdef CONFIG_PARAVIRT_XXL
+#include <asm/paravirt.h>
+#else
+#define tss_update_io_bitmap native_tss_update_io_bitmap
+#endif
+
  #else
  static inline void io_bitmap_share(struct task_struct *tsk) { }
  static inline void io_bitmap_exit(void) { }
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 86e7317eb31f..694d8daf4983 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -295,6 +295,13 @@ static inline void write_idt_entry(gate_desc *dt, int 
entry, const gate_desc *g)
        PVOP_VCALL3(cpu.write_idt_entry, dt, entry, g);
  }
+#ifdef CONFIG_X86_IOPL_IOPERM
+static inline void tss_update_io_bitmap(void)
+{
+       PVOP_VCALL0(cpu.update_io_bitmap);
+}
+#endif
+
  static inline void paravirt_activate_mm(struct mm_struct *prev,
                                        struct mm_struct *next)
  {
diff --git a/arch/x86/include/asm/paravirt_types.h 
b/arch/x86/include/asm/paravirt_types.h
index 84812964d3dd..732f62e04ddb 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -140,6 +140,10 @@ struct pv_cpu_ops {
void (*load_sp0)(unsigned long sp0); +#ifdef CONFIG_X86_IOPL_IOPERM
+       void (*update_io_bitmap)(void);
+#endif
+
        void (*wbinvd)(void);
/* cpuid emulation, mostly so that caps bits can be disabled */
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 789f5e4f89de..c131ba4e70ef 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -30,6 +30,7 @@
  #include <asm/timer.h>
  #include <asm/special_insns.h>
  #include <asm/tlb.h>
+#include <asm/io_bitmap.h>
/*
   * nop stub, which must not clobber anything *including the stack* to
@@ -341,6 +342,10 @@ struct paravirt_patch_template pv_ops = {
        .cpu.iret               = native_iret,
        .cpu.swapgs             = native_swapgs,
+#ifdef CONFIG_X86_IOPL_IOPERM
+       .cpu.update_io_bitmap   = native_tss_update_io_bitmap,
+#endif
+
        .cpu.start_context_switch       = paravirt_nop,
        .cpu.end_context_switch         = paravirt_nop,
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 839b5244e3b7..3053c85e0e42 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -374,7 +374,7 @@ static void tss_copy_io_bitmap(struct tss_struct *tss, 
struct io_bitmap *iobm)
  /**
   * tss_update_io_bitmap - Update I/O bitmap before exiting to usermode
   */
-void tss_update_io_bitmap(void)
+void native_tss_update_io_bitmap(void)
  {
        struct tss_struct *tss = this_cpu_ptr(&cpu_tss_rw);
        struct thread_struct *t = &current->thread;
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 1f756ffffe8b..feaf2e68ee5c 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -72,6 +72,9 @@
  #include <asm/mwait.h>
  #include <asm/pci_x86.h>
  #include <asm/cpu.h>
+#ifdef CONFIG_X86_IOPL_IOPERM
+#include <asm/io_bitmap.h>
+#endif
#ifdef CONFIG_ACPI
  #include <linux/acpi.h>
@@ -837,6 +840,25 @@ static void xen_load_sp0(unsigned long sp0)
        this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0);
  }
+#ifdef CONFIG_X86_IOPL_IOPERM
+static void xen_update_io_bitmap(void)
+{
+       struct physdev_set_iobitmap iobitmap;
+       struct tss_struct *tss = this_cpu_ptr(&cpu_tss_rw);
+
+       native_tss_update_io_bitmap();
+
+       iobitmap.bitmap = (uint8_t *)(&tss->x86_tss) +
+                         tss->x86_tss.io_bitmap_base;
+       if (tss->x86_tss.io_bitmap_base == IO_BITMAP_OFFSET_INVALID)
+               iobitmap.nr_ports = 0;
+       else
+               iobitmap.nr_ports = IO_BITMAP_BITS;
+
+       HYPERVISOR_physdev_op(PHYSDEVOP_set_iobitmap, &iobitmap);
+}
+#endif
+
  static void xen_io_delay(void)
  {
  }
@@ -1046,6 +1068,9 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
        .write_idt_entry = xen_write_idt_entry,
        .load_sp0 = xen_load_sp0,
+#ifdef CONFIG_X86_IOPL_IOPERM
+       .update_io_bitmap = xen_update_io_bitmap,
+#endif
        .io_delay = xen_io_delay,
/* Xen takes care of %gs when switching to usermode for us */



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