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* x86/ibt,paravirt: Sprinkle ENDBRPeter Zijlstra2022-03-151-0/+2
| | | | | | | Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20220308154318.051635891@infradead.org
* x86/entry,xen: Early rewrite of restore_regs_and_return_to_kernel()Peter Zijlstra2022-03-151-4/+0
| | | | | | | | | | | By doing an early rewrite of 'jmp native_iret` in restore_regs_and_return_to_kernel() we can get rid of the last INTERRUPT_RETURN user and paravirt_iret. Suggested-by: Andrew Cooper <Andrew.Cooper3@citrix.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20220308154317.815039833@infradead.org
* x86/ibt,paravirt: Use text_gen_insn() for paravirt_patch()Peter Zijlstra2022-03-151-20/+3
| | | | | | | | Less duplication is more better. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lore.kernel.org/r/20220308154317.697253958@infradead.org
* x86: Prepare inline-asm for straight-line-speculationPeter Zijlstra2021-12-081-2/+2
| | | | | | | | | Replace all ret/retq instructions with ASM_RET in preparation of making it more than a single instruction. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20211204134907.964635458@infradead.org
* Merge branch 'kvm-guest-sev-migration' into kvm-masterPaolo Bonzini2021-11-111-0/+1
|\ | | | | | | | | | | | | | | | | | | | | | | Add guest api and guest kernel support for SEV live migration. Introduces a new hypercall to notify the host of changes to the page encryption status. If the page is encrypted then it must be migrated through the SEV firmware or a helper VM sharing the key. If page is not encrypted then it can be migrated normally by userspace. This new hypercall is invoked using paravirt_ops. Conflicts: sev_active() replaced by cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT).
| * mm: x86: Invoke hypercall when page encryption status is changedBrijesh Singh2021-11-111-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Invoke a hypercall when a memory region is changed from encrypted -> decrypted and vice versa. Hypervisor needs to know the page encryption status during the guest migration. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Borislav Petkov <bp@suse.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Steve Rutherford <srutherford@google.com> Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> Reviewed-by: Borislav Petkov <bp@suse.de> Message-Id: <0a237d5bb08793916c7790a3e653a2cbe7485761.1629726117.git.ashish.kalra@amd.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* | x86/xen: switch initial pvops IRQ functions to dummy onesJuergen Gross2021-11-021-1/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The initial pvops functions handling irq flags will only ever be called before interrupts are being enabled. So switch them to be dummy functions: - xen_save_fl() can always return 0 - xen_irq_disable() is a nop - xen_irq_enable() can BUG() Add some generic paravirt functions for that purpose. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20211028072748.29862-3-jgross@suse.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
* | x86/xen: Make irq_disable() noinstrPeter Zijlstra2021-09-171-1/+6
| | | | | | | | | | | | | | | | | | | | | | vmlinux.o: warning: objtool: pv_ops[31]: native_irq_disable vmlinux.o: warning: objtool: pv_ops[31]: __raw_callee_save_xen_irq_disable vmlinux.o: warning: objtool: pv_ops[31]: xen_irq_disable_direct vmlinux.o: warning: objtool: lock_is_held_type()+0x5b: call to pv_ops[31]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20210624095148.933869441@infradead.org
* | x86/xen: Make irq_enable() noinstrPeter Zijlstra2021-09-171-1/+6
| | | | | | | | | | | | | | | | | | | | | | vmlinux.o: warning: objtool: pv_ops[32]: native_irq_enable vmlinux.o: warning: objtool: pv_ops[32]: __raw_callee_save_xen_irq_enable vmlinux.o: warning: objtool: pv_ops[32]: xen_irq_enable_direct vmlinux.o: warning: objtool: lock_is_held_type()+0xfe: call to pv_ops[32]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20210624095148.872254932@infradead.org
* | x86/xen: Make set_debugreg() noinstrPeter Zijlstra2021-09-171-3/+6
| | | | | | | | | | | | | | | | | | | | vmlinux.o: warning: objtool: pv_ops[2]: xen_set_debugreg vmlinux.o: warning: objtool: pv_ops[2]: native_set_debugreg vmlinux.o: warning: objtool: exc_debug()+0x3b: call to pv_ops[2]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20210624095148.687755639@infradead.org
* | x86/xen: Make get_debugreg() noinstrPeter Zijlstra2021-09-171-2/+6
| | | | | | | | | | | | | | | | | | | | vmlinux.o: warning: objtool: pv_ops[1]: xen_get_debugreg vmlinux.o: warning: objtool: pv_ops[1]: native_get_debugreg vmlinux.o: warning: objtool: exc_debug()+0x25: call to pv_ops[1]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20210624095148.625523645@infradead.org
* | x86/xen: Make write_cr2() noinstrPeter Zijlstra2021-09-171-1/+6
| | | | | | | | | | | | | | | | | | | | vmlinux.o: warning: objtool: pv_ops[42]: native_write_cr2 vmlinux.o: warning: objtool: pv_ops[42]: xen_write_cr2 vmlinux.o: warning: objtool: exc_nmi()+0x127: call to pv_ops[42]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20210624095148.563524913@infradead.org
* | x86/xen: Make read_cr2() noinstrPeter Zijlstra2021-09-171-1/+6
|/ | | | | | | | | | | vmlinux.o: warning: objtool: pv_ops[41]: native_read_cr2 vmlinux.o: warning: objtool: pv_ops[41]: xen_read_cr2 vmlinux.o: warning: objtool: pv_ops[41]: xen_read_cr2_direct vmlinux.o: warning: objtool: exc_double_fault()+0x15: call to pv_ops[41]() leaves .noinstr.text section Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20210624095148.500331616@infradead.org
* Merge tag 'x86-mm-2021-04-29' of ↵Linus Torvalds2021-04-291-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 tlb updates from Ingo Molnar: "The x86 MM changes in this cycle were: - Implement concurrent TLB flushes, which overlaps the local TLB flush with the remote TLB flush. In testing this improved sysbench performance measurably by a couple of percentage points, especially if TLB-heavy security mitigations are active. - Further micro-optimizations to improve the performance of TLB flushes" * tag 'x86-mm-2021-04-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: smp: Micro-optimize smp_call_function_many_cond() smp: Inline on_each_cpu_cond() and on_each_cpu() x86/mm/tlb: Remove unnecessary uses of the inline keyword cpumask: Mark functions as pure x86/mm/tlb: Do not make is_lazy dirty for no reason x86/mm/tlb: Privatize cpu_tlbstate x86/mm/tlb: Flush remote and local TLBs concurrently x86/mm/tlb: Open-code on_each_cpu_cond_mask() for tlb_is_not_lazy() x86/mm/tlb: Unify flush_tlb_func_local() and flush_tlb_func_remote() smp: Run functions concurrently in smp_call_function_many_cond()
| * x86/mm/tlb: Flush remote and local TLBs concurrentlyNadav Amit2021-03-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To improve TLB shootdown performance, flush the remote and local TLBs concurrently. Introduce flush_tlb_multi() that does so. Introduce paravirtual versions of flush_tlb_multi() for KVM, Xen and hyper-v (Xen and hyper-v are only compile-tested). While the updated smp infrastructure is capable of running a function on a single local core, it is not optimized for this case. The multiple function calls and the indirect branch introduce some overhead, and might make local TLB flushes slower than they were before the recent changes. Before calling the SMP infrastructure, check if only a local TLB flush is needed to restore the lost performance in this common case. This requires to check mm_cpumask() one more time, but unless this mask is updated very frequently, this should impact performance negatively. Signed-off-by: Nadav Amit <namit@vmware.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Michael Kelley <mikelley@microsoft.com> # Hyper-v parts Reviewed-by: Juergen Gross <jgross@suse.com> # Xen and paravirt parts Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/r/20210220231712.2475218-5-namit@vmware.com
* | x86/paravirt: Have only one paravirt patch functionJuergen Gross2021-03-111-18/+2
| | | | | | | | | | | | | | | | | | | | | | There is no need any longer to have different paravirt patch functions for native and Xen. Eliminate native_patch() and rename paravirt_patch_default() to paravirt_patch(). Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210311142319.4723-15-jgross@suse.com
* | x86/paravirt: Switch functions with custom code to ALTERNATIVEJuergen Gross2021-03-111-10/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of using paravirt patching for custom code sequences use ALTERNATIVE for the functions with custom code replacements. Instead of patching an ud2 instruction for unpopulated vector entries into the caller site, use a simple function just calling BUG() as a replacement. Simplify the register defines for assembler paravirt calling, as there isn't much usage left. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210311142319.4723-14-jgross@suse.com
* | x86/paravirt: Switch iret pvops to ALTERNATIVEJuergen Gross2021-03-111-24/+2
| | | | | | | | | | | | | | | | | | | | The iret paravirt op is rather special as it is using a jmp instead of a call instruction. Switch it to ALTERNATIVE. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210311142319.4723-12-jgross@suse.com
* | x86/paravirt: Switch time pvops functions to use static_call()Juergen Gross2021-03-111-4/+9
|/ | | | | | | | | | | | | The time pvops functions are the only ones left which might be used in 32-bit mode and which return a 64-bit value. Switch them to use the static_call() mechanism instead of pvops, as this allows quite some simplification of the pvops implementation. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210311142319.4723-5-jgross@suse.com
* x86/pv: Rework arch_local_irq_restore() to not use popfJuergen Gross2021-02-101-1/+0
| | | | | | | | | | | | | POPF is a rather expensive operation, so don't use it for restoring irq flags. Instead, test whether interrupts are enabled in the flags parameter and enable interrupts via STI in that case. This results in the restore_fl paravirt op to be no longer needed. Suggested-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210120135555.32594-7-jgross@suse.com
* x86/xen: Drop USERGS_SYSRET64 paravirt callJuergen Gross2021-02-101-4/+1
| | | | | | | | | | | | | | | | | | | | | | | | | USERGS_SYSRET64 is used to return from a syscall via SYSRET, but a Xen PV guest will nevertheless use the IRET hypercall, as there is no sysret PV hypercall defined. So instead of testing all the prerequisites for doing a sysret and then mangling the stack for Xen PV again for doing an iret just use the iret exit from the beginning. This can easily be done via an ALTERNATIVE like it is done for the sysenter compat case already. It should be noted that this drops the optimization in Xen for not restoring a few registers when returning to user mode, but it seems as if the saved instructions in the kernel more than compensate for this drop (a kernel build in a Xen PV guest was slightly faster with this patch applied). While at it remove the stale sysret32 remnants. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210120135555.32594-6-jgross@suse.com
* x86/pv: Switch SWAPGS to ALTERNATIVEJuergen Gross2021-02-101-1/+0
| | | | | | | | | | | | | | | | | | | SWAPGS is used only for interrupts coming from user mode or for returning to user mode. So there is no reason to use the PARAVIRT framework, as it can easily be replaced by an ALTERNATIVE depending on X86_FEATURE_XENPV. There are several instances using the PV-aware SWAPGS macro in paths which are never executed in a Xen PV guest. Replace those with the plain swapgs instruction. For SWAPGS_UNSAFE_STACK the same applies. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Andy Lutomirski <luto@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210120135555.32594-5-jgross@suse.com
* x86/paravirt: Remove set_pte_at() pv-opJuergen Gross2020-08-151-1/+0
| | | | | | | | | | | On x86 set_pte_at() is now always falling back to set_pte(). So instead of having this fallback after the paravirt maze just drop the set_pte_at paravirt operation and let set_pte_at() use the set_pte() function directly. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200815100641.26362-6-jgross@suse.com
* x86/paravirt: Remove 32-bit support from CONFIG_PARAVIRT_XXLJuergen Gross2020-08-151-18/+0
| | | | | | | | | | The last 32-bit user of stuff under CONFIG_PARAVIRT_XXL is gone. Remove 32-bit specific parts. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200815100641.26362-2-jgross@suse.com
* x86/ioperm: Fix io bitmap invalidation on Xen PVAndy Lutomirski2020-07-181-1/+2
| | | | | | | | | | | | | | | | | | | tss_invalidate_io_bitmap() wasn't wired up properly through the pvop machinery, so the TSS and Xen's io bitmap would get out of sync whenever disabling a valid io bitmap. Add a new pvop for tss_invalidate_io_bitmap() to fix it. This is XSA-329. Fixes: 22fe5b0439dd ("x86/ioperm: Move TSS bitmap update to exit to user work") Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Juergen Gross <jgross@suse.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/d53075590e1f91c19f8af705059d3ff99424c020.1595030016.git.luto@kernel.org
* mm: reorder includes after introduction of linux/pgtable.hMike Rapoport2020-06-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The replacement of <asm/pgrable.h> with <linux/pgtable.h> made the include of the latter in the middle of asm includes. Fix this up with the aid of the below script and manual adjustments here and there. import sys import re if len(sys.argv) is not 3: print "USAGE: %s <file> <header>" % (sys.argv[0]) sys.exit(1) hdr_to_move="#include <linux/%s>" % sys.argv[2] moved = False in_hdrs = False with open(sys.argv[1], "r") as f: lines = f.readlines() for _line in lines: line = _line.rstrip(' ') if line == hdr_to_move: continue if line.startswith("#include <linux/"): in_hdrs = True elif not moved and in_hdrs: moved = True print hdr_to_move print line Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-4-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* mm: introduce include/linux/pgtable.hMike Rapoport2020-06-091-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The include/linux/pgtable.h is going to be the home of generic page table manipulation functions. Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and make the latter include asm/pgtable.h. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* x86/tlb: Move __flush_tlb_one_user() out of lineThomas Gleixner2020-04-261-5/+0
| | | | | | | | | | | | | | | | | | | | | | cpu_tlbstate is exported because various TLB-related functions need access to it, but cpu_tlbstate is sensitive information which should only be accessed by well-contained kernel functions and not be directly exposed to modules. As a third step, move _flush_tlb_one_user() out of line and hide the native function. The latter can be static when CONFIG_PARAVIRT is disabled. Consolidate the name space while at it and remove the pointless extra wrapper in the paravirt code. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200421092559.428213098@linutronix.de
* x86/tlb: Move __flush_tlb_global() out of lineThomas Gleixner2020-04-261-9/+0
| | | | | | | | | | | | | | | | | | | | | | cpu_tlbstate is exported because various TLB-related functions need access to it, but cpu_tlbstate is sensitive information which should only be accessed by well-contained kernel functions and not be directly exposed to modules. As a second step, move __flush_tlb_global() out of line and hide the native function. The latter can be static when CONFIG_PARAVIRT is disabled. Consolidate the namespace while at it and remove the pointless extra wrapper in the paravirt code. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200421092559.336916818@linutronix.de
* x86/tlb: Move __flush_tlb() out of lineThomas Gleixner2020-04-261-6/+1
| | | | | | | | | | | | | | | | | | | | | cpu_tlbstate is exported because various TLB-related functions need access to it, but cpu_tlbstate is sensitive information which should only be accessed by well-contained kernel functions and not be directly exposed to modules. As a first step, move __flush_tlb() out of line and hide the native function. The latter can be static when CONFIG_PARAVIRT is disabled. Consolidate the namespace while at it and remove the pointless extra wrapper in the paravirt code. No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200421092559.246130908@linutronix.de
* x86/ioperm: Add new paravirt function update_io_bitmap()Juergen Gross2020-02-291-0/+5
| | | | | | | | | | | | | | | | | | | | | 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@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
* x86/iopl: Remove legacy IOPL optionThomas Gleixner2019-11-161-2/+0
| | | | | | | | | | The IOPL emulation via the I/O bitmap is sufficient. Remove the legacy cruft dealing with the (e)flags based IOPL mechanism. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Juergen Gross <jgross@suse.com> (Paravirt and Xen parts) Acked-by: Andy Lutomirski <luto@kernel.org>
* x86/paravirt: Drop {read,write}_cr8() hooksAndrew Cooper2019-07-221-4/+0
| | | | | | | | | | | | | | | | | | | There is a lot of infrastructure for functionality which is used exclusively in __{save,restore}_processor_state() on the suspend/resume path. cr8 is an alias of APIC_TASKPRI, and APIC_TASKPRI is saved/restored by lapic_{suspend,resume}(). Saving and restoring cr8 independently of the rest of the Local APIC state isn't a clever thing to be doing. Delete the suspend/resume cr8 handling, which shrinks the size of struct saved_context, and allows for the removal of both PVOPS. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lkml.kernel.org/r/20190715151641.29210-1-andrew.cooper3@citrix.com
* x86/paravirt: Make read_cr2() CALLEE_SAVEPeter Zijlstra2019-07-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | The one paravirt read_cr2() implementation (Xen) is actually quite trivial and doesn't need to clobber anything other than the return register. Making read_cr2() CALLEE_SAVE avoids all the PUSH/POP nonsense and allows more convenient use from assembly. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Juergen Gross <jgross@suse.com> Cc: bp@alien8.de Cc: rostedt@goodmis.org Cc: luto@kernel.org Cc: torvalds@linux-foundation.org Cc: hpa@zytor.com Cc: dave.hansen@linux.intel.com Cc: zhe.he@windriver.com Cc: joel@joelfernandes.org Cc: devel@etsukata.com Link: https://lkml.kernel.org/r/20190711114335.887392493@infradead.org
* Merge branch 'x86-paravirt-for-linus' of ↵Linus Torvalds2019-07-091-23/+23
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 paravirt updates from Ingo Molnar: "A handful of paravirt patching code enhancements to make it more robust against patching failures, and related cleanups and not so related cleanups - by Thomas Gleixner and myself" * 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/paravirt: Rename paravirt_patch_site::instrtype to paravirt_patch_site::type x86/paravirt: Standardize 'insn_buff' variable names x86/paravirt: Match paravirt patchlet field definition ordering to initialization ordering x86/paravirt: Replace the paravirt patch asm magic x86/paravirt: Unify the 32/64 bit paravirt patching code x86/paravirt: Detect over-sized patching bugs in paravirt_patch_call() x86/paravirt: Detect over-sized patching bugs in paravirt_patch_insns() x86/paravirt: Remove bogus extern declarations
| * x86/paravirt: Standardize 'insn_buff' variable namesIngo Molnar2019-04-291-11/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We currently have 6 (!) separate naming variants to name temporary instruction buffers that are used for code patching: - insnbuf - insnbuff - insn_buff - insn_buffer - ibuf - ibuffer These are used as local variables, percpu fields and function parameters. Standardize all the names to a single variant: 'insn_buff'. Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * x86/paravirt: Detect over-sized patching bugs in paravirt_patch_call()Ingo Molnar2019-04-251-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | paravirt_patch_call() currently handles patching failures inconsistently: we generate a warning in the retpoline case, but don't in other cases where we might end up with a non-working kernel as well. So just convert it all to a BUG_ON(), these patching calls are *not* supposed to fail, and if they do we want to know it immediately. This also makes the kernel smaller and removes an #ifdef ugly. I tried it with a richly paravirt-enabled kernel and no patching bugs were detected. Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20190425095039.GC115378@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
| * x86/paravirt: Detect over-sized patching bugs in paravirt_patch_insns()Ingo Molnar2019-04-251-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | So paravirt_patch_insns() contains this gem of logic: unsigned paravirt_patch_insns(void *insnbuf, unsigned len, const char *start, const char *end) { unsigned insn_len = end - start; if (insn_len > len || start == NULL) insn_len = len; else memcpy(insnbuf, start, insn_len); return insn_len; } Note how 'len' (size of the original instruction) is checked against the new instruction, and silently discarded with no warning printed whatsoever. This crashes the kernel in funny ways if the patching template is buggy, and usually in much later places. Instead do a direct BUG_ON(), there's no way to continue successfully at that point. I've tested this patch, with the vanilla kernel check never triggers, and if I intentionally increase the size of one of the patch templates to a too high value the assert triggers: [ 0.164385] kernel BUG at arch/x86/kernel/paravirt.c:167! Without this patch a broken kernel randomly crashes in later places, after the silent patching failure. Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20190425091717.GA72229@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 102Thomas Gleixner2019-05-241-13/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 50 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190523091649.499889647@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | x86: Convert some slow-path static_cpu_has() callers to boot_cpu_has()Borislav Petkov2019-04-081-1/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Using static_cpu_has() is pointless on those paths, convert them to the boot_cpu_has() variant. No functional changes. Reported-by: Nadav Amit <nadav.amit@gmail.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Rik van Riel <riel@surriel.com> Reviewed-by: Juergen Gross <jgross@suse.com> # for paravirt Cc: Aubrey Li <aubrey.li@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jann Horn <jannh@google.com> Cc: Joerg Roedel <jroedel@suse.de> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Thomas Lendacky <Thomas.Lendacky@amd.com> Cc: linux-edac@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: virtualization@lists.linux-foundation.org Cc: x86@kernel.org Link: https://lkml.kernel.org/r/20190330112022.28888-3-bp@alien8.de
* x86/paravirt: Remove unused _paravirt_ident_32Juergen Gross2018-10-301-19/+7
| | | | | | | | | | | | | | | | | | | There is no user of _paravirt_ident_32 left in the tree. Remove it together with the related paravirt_patch_ident_32(). paravirt_patch_ident_64() can be moved inside CONFIG_PARAVIRT_XXL=y. Signed-off-by: Juergen Gross <jgross@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: akataria@vmware.com Cc: boris.ostrovsky@oracle.com Cc: rusty@rustcorp.com.au Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/20181030063301.15054-1-jgross@suse.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86/paravirt: Remove GPL from pv_ops exportJuergen Gross2018-10-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | Commit 5c83511bdb9832 ("x86/paravirt: Use a single ops structure") introduced a regression for out-of-tree modules using spinlocks, as pv_lock_ops was exported via EXPORT_SYMBOL(), while the new pv_ops structure now containing the pv lock operations is exported via EXPORT_SYMBOL_GPL(). Change that by using EXPORT_SYMBOL(pv_ops). Fixes: 5c83511bdb9832 ("x86/paravirt: Use a single ops structure") Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20181029150116.25372-1-jgross@suse.com
* Merge branch 'x86-paravirt-for-linus' of ↵Linus Torvalds2018-10-231-156/+160
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 paravirt updates from Ingo Molnar: "Two main changes: - Remove no longer used parts of the paravirt infrastructure and put large quantities of paravirt ops under a new config option PARAVIRT_XXL=y, which is selected by XEN_PV only. (Joergen Gross) - Enable PV spinlocks on Hyperv (Yi Sun)" * 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/hyperv: Enable PV qspinlock for Hyper-V x86/hyperv: Add GUEST_IDLE_MSR support x86/paravirt: Clean up native_patch() x86/paravirt: Prevent redefinition of SAVE_FLAGS macro x86/xen: Make xen_reservation_lock static x86/paravirt: Remove unneeded mmu related paravirt ops bits x86/paravirt: Move the Xen-only pv_mmu_ops under the PARAVIRT_XXL umbrella x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella x86/paravirt: Move the Xen-only pv_cpu_ops under the PARAVIRT_XXL umbrella x86/paravirt: Move items in pv_info under PARAVIRT_XXL umbrella x86/paravirt: Introduce new config option PARAVIRT_XXL x86/paravirt: Remove unused paravirt bits x86/paravirt: Use a single ops structure x86/paravirt: Remove clobbers from struct paravirt_patch_site x86/paravirt: Remove clobbers parameter from paravirt patch functions x86/paravirt: Make paravirt_patch_call() and paravirt_patch_jmp() static x86/xen: Add SPDX identifier in arch/x86/xen files x86/xen: Link platform-pci-unplug.o only if CONFIG_XEN_PVHVM x86/xen: Move pv specific parts of arch/x86/xen/mmu.c to mmu_pv.c x86/xen: Move pv irq related functions under CONFIG_XEN_PV umbrella
| * x86/paravirt: Move the Xen-only pv_mmu_ops under the PARAVIRT_XXL umbrellaJuergen Gross2018-09-031-6/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Most of the paravirt ops defined in pv_mmu_ops are for Xen PV guests only. Define them only if CONFIG_PARAVIRT_XXL is set. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-15-jgross@suse.com
| * x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrellaJuergen Gross2018-09-031-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All of the paravirt ops defined in pv_irq_ops are for Xen PV guests or VSMP only. Define them only if CONFIG_PARAVIRT_XXL is set. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-14-jgross@suse.com
| * x86/paravirt: Move the Xen-only pv_cpu_ops under the PARAVIRT_XXL umbrellaJuergen Gross2018-09-031-1/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Most of the paravirt ops defined in pv_cpu_ops are for Xen PV guests only. Define them only if CONFIG_PARAVIRT_XXL is set. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-13-jgross@suse.com
| * x86/paravirt: Move items in pv_info under PARAVIRT_XXL umbrellaJuergen Gross2018-09-031-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All items but name in pv_info are needed by Xen PV only. Define them with CONFIG_PARAVIRT_XXL set only. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-12-jgross@suse.com
| * x86/paravirt: Use a single ops structureJuergen Gross2018-09-031-149/+141
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instead of using six globally visible paravirt ops structures combine them in a single structure, keeping the original structures as sub-structures. This avoids the need to assemble struct paravirt_patch_template at runtime on the stack each time apply_paravirt() is being called (i.e. when loading a module). [ tglx: Made the struct and the initializer tabular for readability sake ] Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-9-jgross@suse.com
| * x86/paravirt: Remove clobbers parameter from paravirt patch functionsJuergen Gross2018-09-031-9/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The clobbers parameter from paravirt_patch_default() et al isn't used any longer. Remove it. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-7-jgross@suse.com
| * x86/paravirt: Make paravirt_patch_call() and paravirt_patch_jmp() staticJuergen Gross2018-09-031-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | paravirt_patch_call() and paravirt_patch_jmp() are used in paravirt.c only. Convert them to static. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: xen-devel@lists.xenproject.org Cc: virtualization@lists.linux-foundation.org Cc: akataria@vmware.com Cc: rusty@rustcorp.com.au Cc: boris.ostrovsky@oracle.com Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/20180828074026.820-6-jgross@suse.com
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