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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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99bcd4a6e5
Commit111e7b15cf("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:111e7b15cf("x86/ioperm: Extend IOPL config to control ioperm() as well") Reported-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Cc: <stable@vger.kernel.org> # 5.5 Link: https://lkml.kernel.org/r/20200218154712.25490-1-jgross@suse.com
37 lines
812 B
C
37 lines
812 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_IOBITMAP_H
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#define _ASM_X86_IOBITMAP_H
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#include <linux/refcount.h>
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#include <asm/processor.h>
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struct io_bitmap {
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u64 sequence;
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refcount_t refcnt;
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/* The maximum number of bytes to copy so all zero bits are covered */
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unsigned int max;
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unsigned long bitmap[IO_BITMAP_LONGS];
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};
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struct task_struct;
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#ifdef CONFIG_X86_IOPL_IOPERM
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void io_bitmap_share(struct task_struct *tsk);
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void io_bitmap_exit(void);
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void native_tss_update_io_bitmap(void);
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#ifdef CONFIG_PARAVIRT_XXL
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#include <asm/paravirt.h>
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#else
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#define tss_update_io_bitmap native_tss_update_io_bitmap
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#endif
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#else
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static inline void io_bitmap_share(struct task_struct *tsk) { }
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static inline void io_bitmap_exit(void) { }
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static inline void tss_update_io_bitmap(void) { }
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#endif
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#endif
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