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From: Rick Edgecombe <rick.p.edgecombe@intel.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	x86@kernel.org, linux-mm@kvack.org, luto@kernel.org,
	peterz@infradead.org, dave.hansen@intel.com, pbonzini@redhat.com,
	sean.j.christopherson@intel.com, keescook@chromium.org
Cc: kristen@linux.intel.com, deneen.t.dock@intel.com,
	Rick Edgecombe <rick.p.edgecombe@intel.com>
Subject: [RFC PATCH 10/13] x86/mm: Add NR page bit for KVM XO
Date: Thu,  3 Oct 2019 14:23:57 -0700	[thread overview]
Message-ID: <20191003212400.31130-11-rick.p.edgecombe@intel.com> (raw)
In-Reply-To: <20191003212400.31130-1-rick.p.edgecombe@intel.com>

Add _PAGE_BIT_NR and _PAGE_NR, the values of which are determined
dynamically at boot. This page type is only valid after checking for for
the KVM XO CPUID bit.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
 arch/x86/include/asm/pgtable_types.h | 11 +++++++++++
 arch/x86/mm/init.c                   |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index b5e49e6bac63..d3c92c992089 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -30,6 +30,14 @@
 #define _PAGE_BIT_PKEY_BIT3	62	/* Protection Keys, bit 4/4 */
 #define _PAGE_BIT_NX		63	/* No execute: only valid after cpuid check */
 
+#if defined(CONFIG_KVM_XO) && !defined(__ASSEMBLY__)
+extern unsigned int __pgtable_kvmxo_bit;
+/* KVM based not-readable: only valid after cpuid check */
+#define _PAGE_BIT_NR		(__pgtable_kvmxo_bit)
+#else /* defined(CONFIG_KVM_XO) && !defined(__ASSEMBLY__) */
+#define _PAGE_BIT_NR		0
+#endif /* defined(CONFIG_KVM_XO) && !defined(__ASSEMBLY__) */
+
 #define _PAGE_BIT_SPECIAL	_PAGE_BIT_SOFTW1
 #define _PAGE_BIT_CPA_TEST	_PAGE_BIT_SOFTW1
 #define _PAGE_BIT_SOFT_DIRTY	_PAGE_BIT_SOFTW3 /* software dirty tracking */
@@ -39,6 +47,9 @@
 /* - if the user mapped it with PROT_NONE; pte_present gives true */
 #define _PAGE_BIT_PROTNONE	_PAGE_BIT_GLOBAL
 
+#define _PAGE_NR	(pgtable_kvmxo_enabled() ? \
+			(_AT(pteval_t, 1) << _PAGE_BIT_NR) : 0)
+
 #define _PAGE_PRESENT	(_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
 #define _PAGE_RW	(_AT(pteval_t, 1) << _PAGE_BIT_RW)
 #define _PAGE_USER	(_AT(pteval_t, 1) << _PAGE_BIT_USER)
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index fd10d91a6115..7298156a76d5 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -195,6 +195,9 @@ static void __init probe_page_size_mask(void)
 		__supported_pte_mask |= _PAGE_GLOBAL;
 	}
 
+	if (pgtable_kvmxo_enabled())
+		__supported_pte_mask |= _PAGE_NR;
+
 	/* By the default is everything supported: */
 	__default_kernel_pte_mask = __supported_pte_mask;
 	/* Except when with PTI where the kernel is mostly non-Global: */
-- 
2.17.1


  parent reply	other threads:[~2019-10-03 21:39 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-03 21:23 [RFC PATCH 00/13] XOM for KVM guest userspace Rick Edgecombe
2019-10-03 21:23 ` [RFC PATCH 01/13] kvm: Enable MTRR to work with GFNs with perm bits Rick Edgecombe
2019-10-14  6:47   ` Yu Zhang
2019-10-14 18:44     ` Edgecombe, Rick P
2019-10-03 21:23 ` [RFC PATCH 02/13] kvm: Add support for X86_FEATURE_KVM_XO Rick Edgecombe
2019-10-03 21:23 ` [RFC PATCH 03/13] kvm: Add XO memslot type Rick Edgecombe
2019-10-04  7:27   ` Paolo Bonzini
2019-10-04 19:06     ` Edgecombe, Rick P
2019-10-06 16:15       ` Paolo Bonzini
2019-10-03 21:23 ` [RFC PATCH 04/13] kvm, vmx: Add support for gva exit qualification Rick Edgecombe
2019-10-03 21:23 ` [RFC PATCH 05/13] kvm: Add #PF injection for KVM XO Rick Edgecombe
2019-10-04  7:42   ` Paolo Bonzini
2019-10-04 19:11     ` Edgecombe, Rick P
2019-10-03 21:23 ` [RFC PATCH 06/13] kvm: Add KVM_CAP_EXECONLY_MEM Rick Edgecombe
2019-10-04  7:24   ` Paolo Bonzini
2019-10-04 19:11     ` Edgecombe, Rick P
2019-10-03 21:23 ` [RFC PATCH 07/13] kvm: Add docs for KVM_CAP_EXECONLY_MEM Rick Edgecombe
2019-10-03 21:23 ` [RFC PATCH 08/13] x86/boot: Rename USE_EARLY_PGTABLE_L5 Rick Edgecombe
2019-10-03 21:23 ` [RFC PATCH 09/13] x86/cpufeature: Add detection of KVM XO Rick Edgecombe
2019-10-29 23:33   ` Kees Cook
2019-10-29 23:52     ` Edgecombe, Rick P
2019-10-30 14:55       ` Sean Christopherson
2019-10-30 21:02         ` Edgecombe, Rick P
2019-10-03 21:23 ` Rick Edgecombe [this message]
2019-10-04  7:33   ` [RFC PATCH 10/13] x86/mm: Add NR page bit for " Paolo Bonzini
2019-10-03 21:23 ` [RFC PATCH 11/13] x86, ptdump: Add NR bit to page table dump Rick Edgecombe
2019-10-03 21:23 ` [RFC PATCH 12/13] mmap: Add XO support for KVM XO Rick Edgecombe
2019-10-04  7:34   ` Paolo Bonzini
2019-10-04 19:12     ` Edgecombe, Rick P
2019-10-03 21:24 ` [RFC PATCH 13/13] x86/Kconfig: Add Kconfig for KVM based XO Rick Edgecombe
2019-10-29 23:36   ` Kees Cook
2019-10-30  0:01     ` Edgecombe, Rick P
2019-10-30 18:36       ` Kees Cook
2019-10-04  7:22 ` [RFC PATCH 00/13] XOM for KVM guest userspace Paolo Bonzini
2019-10-04 19:03   ` Edgecombe, Rick P
2019-10-04 14:56 ` Andy Lutomirski
2019-10-04 20:09   ` Edgecombe, Rick P
2019-10-05  1:33     ` Andy Lutomirski
2019-10-07 18:14       ` Edgecombe, Rick P
2019-10-29 23:40 ` Kees Cook
2019-10-30  0:27   ` Edgecombe, Rick P

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