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From: Ankur Arora <ankur.a.arora@oracle.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: peterz@infradead.org, hpa@zytor.com, jpoimboe@redhat.com,
	namit@vmware.com, mhiramat@kernel.org, jgross@suse.com,
	bp@alien8.de, vkuznets@redhat.com, pbonzini@redhat.com,
	boris.ostrovsky@oracle.com, mihai.carabas@oracle.com,
	kvm@vger.kernel.org, xen-devel@lists.xenproject.org,
	virtualization@lists.linux-foundation.org,
	Ankur Arora <ankur.a.arora@oracle.com>
Subject: [RFC PATCH 08/26] x86/paravirt: Stash native pv-ops
Date: Tue,  7 Apr 2020 22:03:05 -0700	[thread overview]
Message-ID: <20200408050323.4237-9-ankur.a.arora@oracle.com> (raw)
In-Reply-To: <20200408050323.4237-1-ankur.a.arora@oracle.com>

Introduce native_pv_ops where we stash the pv_ops array before
hypervisor specific hooks have modified it.

native_pv_ops get used when switching between paravirt and native
pv-ops at runtime.

Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
 arch/x86/include/asm/paravirt_types.h |  4 ++++
 arch/x86/kernel/paravirt.c            | 10 ++++++++++
 arch/x86/kernel/setup.c               |  2 ++
 3 files changed, 16 insertions(+)

diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index f1153f53c529..bc935eec7ec6 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -339,6 +339,7 @@ extern struct paravirt_patch_template pv_ops;
 
 #ifdef CONFIG_PARAVIRT_RUNTIME
 #define PVRT_SUFFIX ".runtime"
+extern struct paravirt_patch_template native_pv_ops;
 #else
 #define PVRT_SUFFIX ""
 #endif
@@ -775,6 +776,9 @@ extern struct paravirt_patch_site __parainstructions[],
 #ifdef CONFIG_PARAVIRT_RUNTIME
 extern struct paravirt_patch_site __parainstructions_runtime[],
 	__parainstructions_runtime_end[];
+void paravirt_ops_init(void);
+#else
+static inline void paravirt_ops_init(void) { }
 #endif
 
 #endif	/* __ASSEMBLY__ */
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index c131ba4e70ef..8c511cc4d4f4 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -458,5 +458,15 @@ NOKPROBE_SYMBOL(native_set_debugreg);
 NOKPROBE_SYMBOL(native_load_idt);
 #endif
 
+#ifdef CONFIG_PARAVIRT_RUNTIME
+__ro_after_init struct paravirt_patch_template native_pv_ops;
+
+void __init paravirt_ops_init(void)
+{
+	native_pv_ops = pv_ops;
+}
+EXPORT_SYMBOL(native_pv_ops);
+#endif
+
 EXPORT_SYMBOL(pv_ops);
 EXPORT_SYMBOL_GPL(pv_info);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index e6b545047f38..2746a6a78fe7 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -43,6 +43,7 @@
 #include <asm/unwind.h>
 #include <asm/vsyscall.h>
 #include <linux/vmalloc.h>
+#include <asm/paravirt_types.h>
 
 /*
  * max_low_pfn_mapped: highest directly mapped pfn < 4 GB
@@ -831,6 +832,7 @@ void __init setup_arch(char **cmdline_p)
 	boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS;
 #endif
 
+	paravirt_ops_init();
 	/*
 	 * If we have OLPC OFW, we might end up relocating the fixmap due to
 	 * reserve_top(), so do this before touching the ioremap area.
-- 
2.20.1


  parent reply	other threads:[~2020-04-08  5:07 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-08  5:02 [RFC PATCH 00/26] Runtime paravirt patching Ankur Arora
2020-04-08  5:02 ` [RFC PATCH 01/26] x86/paravirt: Specify subsection in PVOP macros Ankur Arora
2020-04-08  5:02 ` [RFC PATCH 02/26] x86/paravirt: Allow paravirt patching post-init Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 03/26] x86/paravirt: PVRTOP macros for PARAVIRT_RUNTIME Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 04/26] x86/alternatives: Refactor alternatives_smp_module* Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 05/26] x86/alternatives: Rename alternatives_smp*, smp_alt_module Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 06/26] x86/alternatives: Remove stale symbols Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 07/26] x86/paravirt: Persist .parainstructions.runtime Ankur Arora
2020-04-08  5:03 ` Ankur Arora [this message]
2020-04-08  5:03 ` [RFC PATCH 09/26] x86/paravirt: Add runtime_patch() Ankur Arora
2020-04-08 11:05   ` Peter Zijlstra
2020-04-08  5:03 ` [RFC PATCH 10/26] x86/paravirt: Add primitives to stage pv-ops Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 11/26] x86/alternatives: Remove return value of text_poke*() Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 12/26] x86/alternatives: Use __get_unlocked_pte() in text_poke() Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 13/26] x86/alternatives: Split __text_poke() Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 14/26] x86/alternatives: Handle native insns in text_poke_loc*() Ankur Arora
2020-04-08 11:11   ` Peter Zijlstra
2020-04-08 11:17   ` Peter Zijlstra
2020-04-08  5:03 ` [RFC PATCH 15/26] x86/alternatives: Non-emulated text poking Ankur Arora
2020-04-08 11:13   ` Peter Zijlstra
2020-04-08 11:23   ` Peter Zijlstra
2020-04-08  5:03 ` [RFC PATCH 16/26] x86/alternatives: Add paravirt patching at runtime Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 17/26] x86/alternatives: Add patching logic in text_poke_site() Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 18/26] x86/alternatives: Handle BP in non-emulated text poking Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 19/26] x86/alternatives: NMI safe runtime patching Ankur Arora
2020-04-08 11:36   ` Peter Zijlstra
2020-04-08  5:03 ` [RFC PATCH 20/26] x86/paravirt: Enable pv-spinlocks in runtime_patch() Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 21/26] x86/alternatives: Paravirt runtime selftest Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 22/26] kvm/paravirt: Encapsulate KVM pv switching logic Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 23/26] x86/kvm: Add worker to trigger runtime patching Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 24/26] x86/kvm: Support dynamic CPUID hints Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 25/26] x86/kvm: Guest support for dynamic hints Ankur Arora
2020-04-08  5:03 ` [RFC PATCH 26/26] x86/kvm: Add hint change notifier for KVM_HINT_REALTIME Ankur Arora
2020-04-08 12:08 ` [RFC PATCH 00/26] Runtime paravirt patching Peter Zijlstra
2020-04-08 13:33   ` Jürgen Groß
2020-04-08 14:49     ` Peter Zijlstra
2020-04-10  9:18   ` Ankur Arora
2020-04-08 12:28 ` Jürgen Groß
2020-04-10  7:56   ` Ankur Arora
2020-04-10  9:32   ` Ankur Arora
2020-04-08 14:12 ` Thomas Gleixner
2020-04-10  9:55   ` Ankur Arora

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