From: Brijesh Singh <brijesh.singh@amd.com>
To: simon.guinot@sequanux.org, linux-efi@vger.kernel.org,
brijesh.singh@amd.com, kvm@vger.kernel.org, rkrcmar@redhat.com,
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Subject: [RFC PATCH v2 11/32] x86: Unroll string I/O when SEV is active
Date: Thu, 2 Mar 2017 10:14:35 -0500 [thread overview]
Message-ID: <148846767530.2349.3396612151893482609.stgit@brijesh-build-machine> (raw)
In-Reply-To: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine>
From: Tom Lendacky <thomas.lendacky@amd.com>
Secure Encrypted Virtualization (SEV) does not support string I/O, so
unroll the string I/O operation into a loop operating on one element at
a time.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
arch/x86/include/asm/io.h | 26 ++++++++++++++++++++++----
1 file changed, 22 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 833f7cc..b596114 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -327,14 +327,32 @@ static inline unsigned type in##bwl##_p(int port) \
\
static inline void outs##bwl(int port, const void *addr, unsigned long count) \
{ \
- asm volatile("rep; outs" #bwl \
- : "+S"(addr), "+c"(count) : "d"(port)); \
+ if (sev_active()) { \
+ unsigned type *value = (unsigned type *)addr; \
+ while (count) { \
+ out##bwl(*value, port); \
+ value++; \
+ count--; \
+ } \
+ } else { \
+ asm volatile("rep; outs" #bwl \
+ : "+S"(addr), "+c"(count) : "d"(port)); \
+ } \
} \
\
static inline void ins##bwl(int port, void *addr, unsigned long count) \
{ \
- asm volatile("rep; ins" #bwl \
- : "+D"(addr), "+c"(count) : "d"(port)); \
+ if (sev_active()) { \
+ unsigned type *value = (unsigned type *)addr; \
+ while (count) { \
+ *value = in##bwl(port); \
+ value++; \
+ count--; \
+ } \
+ } else { \
+ asm volatile("rep; ins" #bwl \
+ : "+D"(addr), "+c"(count) : "d"(port)); \
+ } \
}
BUILDIO(b, b, char)
--
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next prev parent reply other threads:[~2017-03-02 15:14 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-02 15:12 [RFC PATCH v2 00/32] x86: Secure Encrypted Virtualization (AMD) Brijesh Singh
2017-03-02 15:12 ` [RFC PATCH v2 01/32] x86: Add the Secure Encrypted Virtualization CPU feature Brijesh Singh
2017-03-03 16:59 ` Borislav Petkov
2017-03-03 21:01 ` Brijesh Singh
2017-03-04 10:11 ` Borislav Petkov
2017-03-06 18:11 ` Brijesh Singh
2017-03-06 20:54 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 02/32] x86: Secure Encrypted Virtualization (SEV) support Brijesh Singh
2017-03-07 11:19 ` Borislav Petkov
2017-03-08 15:06 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 03/32] KVM: SVM: prepare for new bit definition in nested_ctl Brijesh Singh
2017-03-02 15:12 ` [RFC PATCH v2 04/32] KVM: SVM: Add SEV feature definitions to KVM Brijesh Singh
2017-03-07 0:50 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 05/32] x86: Use encrypted access of BOOT related data with SEV Brijesh Singh
2017-03-07 11:09 ` Borislav Petkov
2017-03-16 19:03 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 06/32] x86/pci: Use memremap when walking setup data Brijesh Singh
2017-03-03 20:42 ` Bjorn Helgaas
2017-03-03 21:15 ` Tom Lendacky
2017-03-07 0:03 ` Bjorn Helgaas
2017-03-13 20:08 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 07/32] x86/efi: Access EFI data as encrypted when SEV is active Brijesh Singh
2017-03-07 11:57 ` Borislav Petkov
2017-03-02 15:13 ` [RFC PATCH v2 08/32] x86: Use PAGE_KERNEL protection for ioremap of memory page Brijesh Singh
2017-03-07 14:59 ` Borislav Petkov
2017-03-16 20:04 ` Tom Lendacky
2017-03-17 14:32 ` Tom Lendacky
2017-03-17 14:55 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 09/32] x86: Change early_ioremap to early_memremap for BOOT data Brijesh Singh
2017-03-08 8:46 ` Borislav Petkov
2017-03-02 15:14 ` [RFC PATCH v2 10/32] x86: DMA support for SEV memory encryption Brijesh Singh
2017-03-08 10:56 ` Borislav Petkov
2017-03-02 15:14 ` Brijesh Singh [this message]
2017-03-02 15:14 ` [RFC PATCH v2 12/32] x86: Add early boot support when running with SEV active Brijesh Singh
2017-03-09 14:07 ` Borislav Petkov
2017-03-09 16:13 ` Paolo Bonzini
2017-03-09 16:29 ` Borislav Petkov
2017-03-10 16:35 ` Brijesh Singh
2017-03-16 10:16 ` Borislav Petkov
2017-03-16 14:28 ` Tom Lendacky
2017-03-16 15:09 ` Borislav Petkov
2017-03-16 16:11 ` Tom Lendacky
2017-03-16 16:29 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 13/32] KVM: SVM: Enable SEV by setting the SEV_ENABLE CPU feature Brijesh Singh
2017-03-09 19:29 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 14/32] x86: mm: Provide support to use memblock when spliting large pages Brijesh Singh
2017-03-10 11:06 ` Borislav Petkov
2017-03-10 22:41 ` Brijesh Singh
2017-03-16 13:15 ` Paolo Bonzini
2017-03-16 18:28 ` Borislav Petkov
2017-03-16 22:25 ` Paolo Bonzini
2017-03-17 10:17 ` Borislav Petkov
2017-03-17 10:47 ` Paolo Bonzini
2017-03-17 10:56 ` Borislav Petkov
2017-03-17 11:03 ` Paolo Bonzini
2017-03-17 11:33 ` Borislav Petkov
2017-03-17 14:45 ` Paolo Bonzini
2017-03-18 16:37 ` Borislav Petkov
2017-04-06 14:05 ` Brijesh Singh
2017-04-06 17:25 ` Borislav Petkov
2017-04-06 18:37 ` Brijesh Singh
2017-04-07 11:33 ` Borislav Petkov
2017-04-07 14:50 ` Brijesh Singh
2017-03-16 12:28 ` Paolo Bonzini
2017-03-02 15:15 ` [RFC PATCH v2 15/32] x86: Add support for changing memory encryption attribute in early boot Brijesh Singh
2017-03-24 17:12 ` Borislav Petkov
2017-03-27 15:07 ` Brijesh Singh
2017-03-02 15:15 ` [RFC PATCH v2 16/32] x86: kvm: Provide support to create Guest and HV shared per-CPU variables Brijesh Singh
2017-03-16 11:06 ` Paolo Bonzini
2017-03-28 18:39 ` Borislav Petkov
2017-03-29 15:21 ` Paolo Bonzini
2017-03-29 15:32 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 17/32] x86: kvmclock: Clear encryption attribute when SEV is active Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 18/32] kvm: svm: Use the hardware provided GPA instead of page walk Brijesh Singh
2017-03-29 15:14 ` Borislav Petkov
2017-03-29 17:08 ` Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 19/32] crypto: ccp: Introduce the AMD Secure Processor device Brijesh Singh
2017-03-02 17:39 ` Mark Rutland
2017-03-02 19:11 ` Brijesh Singh
2017-03-03 13:55 ` Andy Shevchenko
2017-03-02 15:16 ` [RFC PATCH v2 20/32] crypto: ccp: Add Platform Security Processor (PSP) interface support Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 21/32] crypto: ccp: Add Secure Encrypted Virtualization (SEV) " Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 22/32] kvm: svm: prepare to reserve asid for SEV guest Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 23/32] kvm: introduce KVM_MEMORY_ENCRYPT_OP ioctl Brijesh Singh
2017-03-16 10:25 ` Paolo Bonzini
2017-03-02 15:17 ` [RFC PATCH v2 24/32] kvm: x86: prepare for SEV guest management API support Brijesh Singh
2017-03-16 10:33 ` Paolo Bonzini
2017-03-02 15:17 ` [RFC PATCH v2 25/32] kvm: svm: Add support for SEV LAUNCH_START command Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 26/32] kvm: svm: Add support for SEV LAUNCH_UPDATE_DATA command Brijesh Singh
2017-03-16 10:48 ` Paolo Bonzini
2017-03-16 18:20 ` Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 27/32] kvm: svm: Add support for SEV LAUNCH_FINISH command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 28/32] kvm: svm: Add support for SEV GUEST_STATUS command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 29/32] kvm: svm: Add support for SEV DEBUG_DECRYPT command Brijesh Singh
2017-03-16 10:54 ` Paolo Bonzini
2017-03-16 18:41 ` Brijesh Singh
2017-03-17 11:09 ` Paolo Bonzini
2017-03-02 15:18 ` [RFC PATCH v2 30/32] kvm: svm: Add support for SEV DEBUG_ENCRYPT command Brijesh Singh
2017-03-16 11:03 ` Paolo Bonzini
2017-03-16 18:34 ` Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 31/32] kvm: svm: Add support for SEV LAUNCH_MEASURE command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 32/32] x86: kvm: Pin the guest memory when SEV is active Brijesh Singh
2017-03-16 10:38 ` Paolo Bonzini
2017-03-16 18:17 ` Brijesh Singh
2017-03-03 20:33 ` [RFC PATCH v2 00/32] x86: Secure Encrypted Virtualization (AMD) Bjorn Helgaas
2017-03-03 20:51 ` Borislav Petkov
2017-03-03 21:15 ` Brijesh Singh
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