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From: Tom Lendacky <thomas.lendacky@amd.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
	linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
	linux-graphics-maintainer@vmware.com,
	amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Joerg Roedel <joro@8bytes.org>, Andi Kleen <ak@linux.intel.com>,
	Sathyanarayanan Kuppuswamy 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>
Subject: [PATCH v2 07/12] x86/sev: Replace occurrences of sev_es_active() with prot_guest_has()
Date: Fri, 13 Aug 2021 11:59:26 -0500	[thread overview]
Message-ID: <0b8480d93b5090fcc34cf5d5035d4d89aa765d79.1628873970.git.thomas.lendacky@amd.com> (raw)
In-Reply-To: <cover.1628873970.git.thomas.lendacky@amd.com>

Replace occurrences of sev_es_active() with the more generic
prot_guest_has() using PATTR_GUEST_PROT_STATE, except for in
arch/x86/kernel/sev*.c and arch/x86/mm/mem_encrypt*.c where PATTR_SEV_ES
will be used. If future support is added for other memory encyrption
techonologies, the use of PATTR_GUEST_PROT_STATE can be updated, as
required, to specifically use PATTR_SEV_ES.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 arch/x86/include/asm/mem_encrypt.h | 2 --
 arch/x86/kernel/sev.c              | 6 +++---
 arch/x86/mm/mem_encrypt.c          | 7 +++----
 arch/x86/realmode/init.c           | 3 +--
 4 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 7e25de37c148..797146e0cd6b 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -50,7 +50,6 @@ void __init mem_encrypt_free_decrypted_mem(void);
 void __init mem_encrypt_init(void);
 
 void __init sev_es_init_vc_handling(void);
-bool sev_es_active(void);
 bool amd_prot_guest_has(unsigned int attr);
 
 #define __bss_decrypted __section(".bss..decrypted")
@@ -74,7 +73,6 @@ static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
 static inline void __init sme_enable(struct boot_params *bp) { }
 
 static inline void sev_es_init_vc_handling(void) { }
-static inline bool sev_es_active(void) { return false; }
 static inline bool amd_prot_guest_has(unsigned int attr) { return false; }
 
 static inline int __init
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index a6895e440bc3..66a4ab9d95d7 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -11,7 +11,7 @@
 
 #include <linux/sched/debug.h>	/* For show_regs() */
 #include <linux/percpu-defs.h>
-#include <linux/mem_encrypt.h>
+#include <linux/protected_guest.h>
 #include <linux/printk.h>
 #include <linux/mm_types.h>
 #include <linux/set_memory.h>
@@ -615,7 +615,7 @@ int __init sev_es_efi_map_ghcbs(pgd_t *pgd)
 	int cpu;
 	u64 pfn;
 
-	if (!sev_es_active())
+	if (!prot_guest_has(PATTR_SEV_ES))
 		return 0;
 
 	pflags = _PAGE_NX | _PAGE_RW;
@@ -774,7 +774,7 @@ void __init sev_es_init_vc_handling(void)
 
 	BUILD_BUG_ON(offsetof(struct sev_es_runtime_data, ghcb_page) % PAGE_SIZE);
 
-	if (!sev_es_active())
+	if (!prot_guest_has(PATTR_SEV_ES))
 		return;
 
 	if (!sev_es_check_cpu_features())
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 83bc928f529e..38dfa84b77a1 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -383,8 +383,7 @@ static bool sme_active(void)
 	return sme_me_mask && !sev_active();
 }
 
-/* Needs to be called from non-instrumentable code */
-bool noinstr sev_es_active(void)
+static bool sev_es_active(void)
 {
 	return sev_status & MSR_AMD64_SEV_ES_ENABLED;
 }
@@ -482,7 +481,7 @@ static void print_mem_encrypt_feature_info(void)
 		pr_cont(" SEV");
 
 	/* Encrypted Register State */
-	if (sev_es_active())
+	if (amd_prot_guest_has(PATTR_SEV_ES))
 		pr_cont(" SEV-ES");
 
 	pr_cont("\n");
@@ -501,7 +500,7 @@ void __init mem_encrypt_init(void)
 	 * With SEV, we need to unroll the rep string I/O instructions,
 	 * but SEV-ES supports them through the #VC handler.
 	 */
-	if (amd_prot_guest_has(PATTR_SEV) && !sev_es_active())
+	if (amd_prot_guest_has(PATTR_SEV) && !amd_prot_guest_has(PATTR_SEV_ES))
 		static_branch_enable(&sev_enable_key);
 
 	print_mem_encrypt_feature_info();
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 2109ae569c67..7711d0071f41 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -2,7 +2,6 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/memblock.h>
-#include <linux/mem_encrypt.h>
 #include <linux/protected_guest.h>
 #include <linux/pgtable.h>
 
@@ -48,7 +47,7 @@ static void sme_sev_setup_real_mode(struct trampoline_header *th)
 	if (prot_guest_has(PATTR_HOST_MEM_ENCRYPT))
 		th->flags |= TH_FLAGS_SME_ACTIVE;
 
-	if (sev_es_active()) {
+	if (prot_guest_has(PATTR_GUEST_PROT_STATE)) {
 		/*
 		 * Skip the call to verify_cpu() in secondary_startup_64 as it
 		 * will cause #VC exceptions when the AP can't handle them yet.
-- 
2.32.0


  parent reply	other threads:[~2021-08-13 17:00 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-13 16:59 [PATCH v2 00/12] Implement generic prot_guest_has() helper function Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 01/12] x86/ioremap: Selectively build arch override encryption functions Tom Lendacky
2021-08-14 15:25   ` Borislav Petkov
2021-08-13 16:59 ` [PATCH v2 02/12] mm: Introduce a function to check for virtualization protection features Tom Lendacky
2021-08-13 17:19   ` Kuppuswamy, Sathyanarayanan
2021-08-14 18:32   ` Borislav Petkov
2021-08-14 18:49     ` Tom Lendacky
2021-08-19  9:46   ` Christoph Hellwig
2021-08-19 16:39     ` Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 03/12] x86/sev: Add an x86 version of prot_guest_has() Tom Lendacky
2021-08-14 19:08   ` Borislav Petkov
2021-08-15 13:53     ` Tom Lendacky
2021-08-15 14:39       ` Borislav Petkov
2021-08-17 15:22         ` Tom Lendacky
2021-08-17 18:39           ` Borislav Petkov
2021-08-19  9:52   ` Christoph Hellwig
2021-08-19 17:26     ` Borislav Petkov
2021-08-19 18:33     ` Tom Lendacky
2021-08-19 19:57       ` Kuppuswamy, Sathyanarayanan
2021-08-24  7:14       ` Christoph Hellwig
2021-08-13 16:59 ` [PATCH v2 04/12] powerpc/pseries/svm: Add a powerpc " Tom Lendacky
2021-08-17  8:35   ` Borislav Petkov
2021-08-17 14:11     ` Tom Lendacky
2021-08-17 12:38   ` Michael Ellerman
2021-08-19  9:55   ` Christoph Hellwig
2021-08-19 18:34     ` Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 05/12] x86/sme: Replace occurrences of sme_active() with prot_guest_has() Tom Lendacky
2021-08-17  9:00   ` Borislav Petkov
2021-08-17 14:46     ` Tom Lendacky
2021-08-17 18:41       ` Borislav Petkov
2021-08-13 16:59 ` [PATCH v2 06/12] x86/sev: Replace occurrences of sev_active() " Tom Lendacky
2021-08-17 10:02   ` Borislav Petkov
2021-08-17 15:26     ` Tom Lendacky
2021-08-17 18:43       ` Borislav Petkov
2021-08-13 16:59 ` Tom Lendacky [this message]
2021-08-17 10:06   ` [PATCH v2 07/12] x86/sev: Replace occurrences of sev_es_active() " Borislav Petkov
2021-08-13 16:59 ` [PATCH v2 08/12] treewide: Replace the use of mem_encrypt_active() " Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 09/12] mm: Remove the now unused mem_encrypt_active() function Tom Lendacky
2021-08-17 10:22   ` Borislav Petkov
2021-08-17 10:24     ` Borislav Petkov
2021-08-17 15:30       ` Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 10/12] x86/sev: " Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 11/12] powerpc/pseries/svm: " Tom Lendacky
2021-08-13 16:59 ` [PATCH v2 12/12] s390/mm: " Tom Lendacky
2021-08-13 17:22 ` [PATCH v2 00/12] Implement generic prot_guest_has() helper function Tom Lendacky

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