From: Tom Lendacky <thomas.lendacky@amd.com>
To: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org,
kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
iommu@lists.linux-foundation.org
Cc: "Rik van Riel" <riel@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Toshimitsu Kani" <toshi.kani@hpe.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Jonathan Corbet" <corbet@lwn.net>,
"Matt Fleming" <matt@codeblueprint.co.uk>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Larry Woodman" <lwoodman@redhat.com>,
"Brijesh Singh" <brijesh.singh@amd.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Andy Lutomirski" <luto@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
"Andrey Ryabinin" <aryabinin@virtuozzo.com>,
"Alexander Potapenko" <glider@google.com>,
"Dave Young" <dyoung@redhat.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Dmitry Vyukov" <dvyukov@google.com>
Subject: [PATCH v5 18/32] x86, mpparse: Use memremap to map the mpf and mpc data
Date: Tue, 18 Apr 2017 16:19:30 -0500 [thread overview]
Message-ID: <20170418211930.10190.62640.stgit@tlendack-t1.amdoffice.net> (raw)
In-Reply-To: <20170418211612.10190.82788.stgit@tlendack-t1.amdoffice.net>
The SMP MP-table is built by UEFI and placed in memory in a decrypted
state. These tables are accessed using a mix of early_memremap(),
early_memunmap(), phys_to_virt() and virt_to_phys(). Change all accesses
to use early_memremap()/early_memunmap(). This allows for proper setting
of the encryption mask so that the data can be successfully accessed when
SME is active.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
arch/x86/kernel/mpparse.c | 102 +++++++++++++++++++++++++++++++--------------
1 file changed, 71 insertions(+), 31 deletions(-)
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index fd37f39..afbda41d 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -429,7 +429,21 @@ static inline void __init construct_default_ISA_mptable(int mpc_default_type)
}
}
-static struct mpf_intel *mpf_found;
+static unsigned long mpf_base;
+
+static void __init unmap_mpf(struct mpf_intel *mpf)
+{
+ early_memunmap(mpf, sizeof(*mpf));
+}
+
+static struct mpf_intel * __init map_mpf(unsigned long paddr)
+{
+ struct mpf_intel *mpf;
+
+ mpf = early_memremap(paddr, sizeof(*mpf));
+
+ return mpf;
+}
static unsigned long __init get_mpc_size(unsigned long physptr)
{
@@ -444,13 +458,21 @@ static unsigned long __init get_mpc_size(unsigned long physptr)
return size;
}
+static void __init unmap_mpc(struct mpc_table *mpc)
+{
+ early_memunmap(mpc, mpc->length);
+}
+
+static struct mpc_table * __init map_mpc(unsigned long paddr)
+{
+ return early_memremap(paddr, get_mpc_size(paddr));
+}
+
static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
{
struct mpc_table *mpc;
- unsigned long size;
- size = get_mpc_size(mpf->physptr);
- mpc = early_memremap(mpf->physptr, size);
+ mpc = map_mpc(mpf->physptr);
/*
* Read the physical hardware table. Anything here will
* override the defaults.
@@ -461,10 +483,10 @@ static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
#endif
pr_err("BIOS bug, MP table errors detected!...\n");
pr_cont("... disabling SMP support. (tell your hw vendor)\n");
- early_memunmap(mpc, size);
+ unmap_mpc(mpc);
return -1;
}
- early_memunmap(mpc, size);
+ unmap_mpc(mpc);
if (early)
return -1;
@@ -497,12 +519,12 @@ static int __init check_physptr(struct mpf_intel *mpf, unsigned int early)
*/
void __init default_get_smp_config(unsigned int early)
{
- struct mpf_intel *mpf = mpf_found;
+ struct mpf_intel *mpf;
if (!smp_found_config)
return;
- if (!mpf)
+ if (!mpf_base)
return;
if (acpi_lapic && early)
@@ -515,6 +537,8 @@ void __init default_get_smp_config(unsigned int early)
if (acpi_lapic && acpi_ioapic)
return;
+ mpf = map_mpf(mpf_base);
+
pr_info("Intel MultiProcessor Specification v1.%d\n",
mpf->specification);
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
@@ -542,8 +566,10 @@ void __init default_get_smp_config(unsigned int early)
construct_default_ISA_mptable(mpf->feature1);
} else if (mpf->physptr) {
- if (check_physptr(mpf, early))
+ if (check_physptr(mpf, early)) {
+ unmap_mpf(mpf);
return;
+ }
} else
BUG();
@@ -552,6 +578,8 @@ void __init default_get_smp_config(unsigned int early)
/*
* Only use the first configuration found.
*/
+
+ unmap_mpf(mpf);
}
static void __init smp_reserve_memory(struct mpf_intel *mpf)
@@ -561,15 +589,16 @@ static void __init smp_reserve_memory(struct mpf_intel *mpf)
static int __init smp_scan_config(unsigned long base, unsigned long length)
{
- unsigned int *bp = phys_to_virt(base);
+ unsigned int *bp;
struct mpf_intel *mpf;
- unsigned long mem;
+ int ret = 0;
apic_printk(APIC_VERBOSE, "Scan for SMP in [mem %#010lx-%#010lx]\n",
base, base + length - 1);
BUILD_BUG_ON(sizeof(*mpf) != 16);
while (length > 0) {
+ bp = early_memremap(base, length);
mpf = (struct mpf_intel *)bp;
if ((*bp == SMP_MAGIC_IDENT) &&
(mpf->length == 1) &&
@@ -579,24 +608,26 @@ static int __init smp_scan_config(unsigned long base, unsigned long length)
#ifdef CONFIG_X86_LOCAL_APIC
smp_found_config = 1;
#endif
- mpf_found = mpf;
+ mpf_base = base;
- pr_info("found SMP MP-table at [mem %#010llx-%#010llx] mapped at [%p]\n",
- (unsigned long long) virt_to_phys(mpf),
- (unsigned long long) virt_to_phys(mpf) +
- sizeof(*mpf) - 1, mpf);
+ pr_info("found SMP MP-table at [mem %#010lx-%#010lx] mapped at [%p]\n",
+ base, base + sizeof(*mpf) - 1, mpf);
- mem = virt_to_phys(mpf);
- memblock_reserve(mem, sizeof(*mpf));
+ memblock_reserve(base, sizeof(*mpf));
if (mpf->physptr)
smp_reserve_memory(mpf);
- return 1;
+ ret = 1;
}
- bp += 4;
+ early_memunmap(bp, length);
+
+ if (ret)
+ break;
+
+ base += 16;
length -= 16;
}
- return 0;
+ return ret;
}
void __init default_find_smp_config(void)
@@ -842,25 +873,26 @@ static int __init update_mp_table(void)
if (!enable_update_mptable)
return 0;
- mpf = mpf_found;
- if (!mpf)
+ if (!mpf_base)
return 0;
+ mpf = map_mpf(mpf_base);
+
/*
* Now see if we need to go further.
*/
if (mpf->feature1 != 0)
- return 0;
+ goto do_unmap_mpf;
if (!mpf->physptr)
- return 0;
+ goto do_unmap_mpf;
- mpc = phys_to_virt(mpf->physptr);
+ mpc = map_mpc(mpf->physptr);
if (!smp_check_mpc(mpc, oem, str))
- return 0;
+ goto do_unmap_mpc;
- pr_info("mpf: %llx\n", (u64)virt_to_phys(mpf));
+ pr_info("mpf: %llx\n", (u64)mpf_base);
pr_info("physptr: %x\n", mpf->physptr);
if (mpc_new_phys && mpc->length > mpc_new_length) {
@@ -878,21 +910,23 @@ static int __init update_mp_table(void)
new = mpf_checksum((unsigned char *)mpc, mpc->length);
if (old == new) {
pr_info("mpc is readonly, please try alloc_mptable instead\n");
- return 0;
+ goto do_unmap_mpc;
}
pr_info("use in-position replacing\n");
} else {
mpf->physptr = mpc_new_phys;
- mpc_new = phys_to_virt(mpc_new_phys);
+ mpc_new = map_mpc(mpc_new_phys);
memcpy(mpc_new, mpc, mpc->length);
+ unmap_mpc(mpc);
mpc = mpc_new;
/* check if we can modify that */
if (mpc_new_phys - mpf->physptr) {
struct mpf_intel *mpf_new;
/* steal 16 bytes from [0, 1k) */
pr_info("mpf new: %x\n", 0x400 - 16);
- mpf_new = phys_to_virt(0x400 - 16);
+ mpf_new = map_mpf(0x400 - 16);
memcpy(mpf_new, mpf, 16);
+ unmap_mpf(mpf);
mpf = mpf_new;
mpf->physptr = mpc_new_phys;
}
@@ -909,6 +943,12 @@ static int __init update_mp_table(void)
*/
replace_intsrc_all(mpc, mpc_new_phys, mpc_new_length);
+do_unmap_mpc:
+ unmap_mpc(mpc);
+
+do_unmap_mpf:
+ unmap_mpf(mpf);
+
return 0;
}
--
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next prev parent reply other threads:[~2017-04-18 21:19 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-18 21:16 [PATCH v5 00/32] x86: Secure Memory Encryption (AMD) Tom Lendacky
2017-04-18 21:16 ` [PATCH v5 01/32] x86: Documentation for AMD Secure Memory Encryption (SME) Tom Lendacky
[not found] ` <20170418211625.10190.52568.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-04-19 9:02 ` Borislav Petkov
2017-04-19 14:23 ` Tom Lendacky
2017-04-19 15:38 ` Borislav Petkov
[not found] ` <20170419090224.frmv2jhwfwoxvdie-fF5Pk5pvG8Y@public.gmane.org>
2017-04-19 9:52 ` David Howells
2017-04-18 21:16 ` [PATCH v5 02/32] x86/mm/pat: Set write-protect cache mode for full PAT support Tom Lendacky
2017-04-18 21:16 ` [PATCH v5 03/32] x86, mpparse, x86/acpi, x86/PCI, SFI: Use memremap for RAM mappings Tom Lendacky
2017-04-18 21:17 ` [PATCH v5 04/32] x86/CPU/AMD: Add the Secure Memory Encryption CPU feature Tom Lendacky
2017-04-18 21:17 ` [PATCH v5 05/32] x86/CPU/AMD: Handle SME reduction in physical address size Tom Lendacky
2017-04-20 16:59 ` Borislav Petkov
2017-04-20 17:29 ` Tom Lendacky
2017-04-20 18:52 ` Borislav Petkov
2017-04-18 21:17 ` [PATCH v5 07/32] x86/mm: Add support to enable SME in early boot processing Tom Lendacky
[not found] ` <20170418211735.10190.29562.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-04-21 14:55 ` Borislav Petkov
[not found] ` <20170421145555.v3xeaijv3vjclsos-fF5Pk5pvG8Y@public.gmane.org>
2017-04-21 21:40 ` Tom Lendacky
2017-04-18 21:17 ` [PATCH v5 08/32] x86/mm: Simplify p[g4um]d_page() macros Tom Lendacky
2017-04-18 21:17 ` [PATCH v5 09/32] x86/mm: Provide general kernel support for memory encryption Tom Lendacky
2017-04-21 21:52 ` Dave Hansen
2017-04-24 15:53 ` Tom Lendacky
[not found] ` <9fc79e28-ad64-1c2f-4c46-a4efcdd550b0-5C7GfCeVMHo@public.gmane.org>
2017-04-24 15:57 ` Dave Hansen
[not found] ` <67926f62-a068-6114-92ee-39bc08488b32-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-04-24 16:10 ` Tom Lendacky
2017-04-27 16:12 ` Borislav Petkov
2017-05-04 14:34 ` Tom Lendacky
2017-05-04 17:01 ` Borislav Petkov
2017-04-18 21:18 ` [PATCH v5 10/32] x86/mm: Extend early_memremap() support with additional attrs Tom Lendacky
2017-04-18 21:18 ` [PATCH v5 11/32] x86/mm: Add support for early encrypt/decrypt of memory Tom Lendacky
2017-04-18 21:18 ` [PATCH v5 12/32] x86/mm: Insure that boot memory areas are mapped properly Tom Lendacky
[not found] ` <20170418211822.10190.67435.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-05-04 10:16 ` Borislav Petkov
2017-05-04 14:39 ` Tom Lendacky
2017-04-18 21:18 ` [PATCH v5 14/32] efi: Add an EFI table address match function Tom Lendacky
2017-05-15 18:09 ` Borislav Petkov
2017-05-16 21:53 ` Tom Lendacky
2017-04-18 21:19 ` [PATCH v5 15/32] efi: Update efi_mem_type() to return an error rather than 0 Tom Lendacky
[not found] ` <20170418211900.10190.98158.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-05-07 17:18 ` Borislav Petkov
2017-05-08 13:20 ` Tom Lendacky
2017-04-18 21:19 ` [PATCH v5 16/32] x86/efi: Update EFI pagetable creation to work with SME Tom Lendacky
2017-04-18 21:19 ` Tom Lendacky [this message]
2017-05-16 8:36 ` [PATCH v5 18/32] x86, mpparse: Use memremap to map the mpf and mpc data Borislav Petkov
2017-05-17 20:26 ` Tom Lendacky
[not found] ` <6e155b8f-b691-2ee0-8977-969aaab6199a-5C7GfCeVMHo@public.gmane.org>
2017-05-18 9:03 ` Borislav Petkov
2017-04-18 21:19 ` [PATCH v5 20/32] x86/mm: Add support for changing the memory encryption attribute Tom Lendacky
[not found] ` <20170418211612.10190.82788.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-04-18 21:17 ` [PATCH v5 06/32] x86/mm: Add Secure Memory Encryption (SME) support Tom Lendacky
2017-04-27 15:46 ` Borislav Petkov
2017-05-04 14:24 ` Tom Lendacky
[not found] ` <d9d9f10a-0ce5-53e8-41f5-f8690dbd7362-5C7GfCeVMHo@public.gmane.org>
2017-05-04 14:36 ` Borislav Petkov
2017-05-16 19:28 ` Tom Lendacky
2017-05-17 7:05 ` Borislav Petkov
2017-04-18 21:18 ` [PATCH v5 13/32] x86/boot/e820: Add support to determine the E820 type of an address Tom Lendacky
[not found] ` <20170418211831.10190.80158.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-05-05 17:11 ` Borislav Petkov
2017-05-06 7:48 ` Ard Biesheuvel
2017-04-18 21:19 ` [PATCH v5 17/32] x86/mm: Add support to access boot related data in the clear Tom Lendacky
2017-05-15 18:35 ` Borislav Petkov
[not found] ` <20170515183517.mb4k2gp2qobbuvtm-fF5Pk5pvG8Y@public.gmane.org>
2017-05-17 18:54 ` Tom Lendacky
2017-05-18 9:02 ` Borislav Petkov
[not found] ` <20170518090212.kebstmnjv4h3cjf2-fF5Pk5pvG8Y@public.gmane.org>
2017-05-19 20:50 ` Tom Lendacky
2017-05-21 7:16 ` Borislav Petkov
2017-05-30 16:46 ` Tom Lendacky
2017-05-31 11:31 ` Borislav Petkov
2017-05-18 19:50 ` Matt Fleming
2017-05-26 16:22 ` Tom Lendacky
[not found] ` <4c2ef3ba-2940-3330-d362-5b2b0d812c6f-5C7GfCeVMHo@public.gmane.org>
2017-05-26 16:35 ` Borislav Petkov
[not found] ` <20170526163517.nrweesvse24dszkz-fF5Pk5pvG8Y@public.gmane.org>
2017-05-30 17:47 ` Tom Lendacky
2017-04-18 21:19 ` [PATCH v5 19/32] x86/mm: Add support to access persistent memory " Tom Lendacky
2017-05-16 14:04 ` Borislav Petkov
2017-05-19 19:52 ` Tom Lendacky
2017-04-18 21:19 ` [PATCH v5 21/32] x86, realmode: Decrypt trampoline area if memory encryption is active Tom Lendacky
2017-04-18 21:20 ` [PATCH v5 22/32] x86, swiotlb: DMA support for memory encryption Tom Lendacky
2017-05-16 14:27 ` Borislav Petkov
2017-05-19 19:54 ` Tom Lendacky
2017-04-18 21:20 ` [PATCH v5 23/32] swiotlb: Add warnings for use of bounce buffers with SME Tom Lendacky
2017-05-16 14:52 ` Borislav Petkov
2017-05-19 19:55 ` Tom Lendacky
2017-04-18 21:20 ` [PATCH v5 24/32] iommu/amd: Disable AMD IOMMU if memory encryption is active Tom Lendacky
2017-04-18 21:20 ` [PATCH v5 25/32] x86, realmode: Check for memory encryption on the APs Tom Lendacky
2017-04-18 21:20 ` [PATCH v5 26/32] x86, drm, fbdev: Do not specify encrypted memory for video mappings Tom Lendacky
2017-05-16 17:35 ` Borislav Petkov
2017-05-30 20:07 ` Tom Lendacky
2017-04-18 21:22 ` [PATCH v5 31/32] x86: Add sysfs support for Secure Memory Encryption Tom Lendacky
2017-04-21 21:55 ` Dave Hansen
2017-04-27 7:25 ` Dave Young
2017-04-27 15:52 ` Dave Hansen
[not found] ` <1f034974-20e6-b5e9-e6ff-434b634e1522-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-04-28 5:32 ` Dave Young
2017-05-04 14:17 ` Tom Lendacky
[not found] ` <20170427072547.GB15297-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2017-05-04 14:13 ` Tom Lendacky
[not found] ` <20170418212212.10190.73484.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-05-18 17:01 ` Borislav Petkov
[not found] ` <20170518170153.eqiyat5s6q3yeejl-fF5Pk5pvG8Y@public.gmane.org>
2017-05-26 2:49 ` Dave Young
2017-05-26 5:04 ` Xunlei Pang
2017-05-26 15:47 ` Tom Lendacky
2017-04-18 21:21 ` [PATCH v5 27/32] kvm: x86: svm: Enable Secure Memory Encryption within KVM Tom Lendacky
2017-04-18 21:21 ` [PATCH v5 28/32] x86/mm, kexec: Allow kexec to be used with SME Tom Lendacky
[not found] ` <20170418212121.10190.94885.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-05-17 19:17 ` Borislav Petkov
2017-05-19 20:45 ` Tom Lendacky
[not found] ` <1b74e0e6-3dda-f638-461b-f73af9904360-5C7GfCeVMHo@public.gmane.org>
2017-05-19 20:58 ` Borislav Petkov
[not found] ` <20170519205836.3wvl3nztqyyouje3-fF5Pk5pvG8Y@public.gmane.org>
2017-05-19 21:07 ` Tom Lendacky
[not found] ` <5ef96f3a-6ebd-1d4d-7ac9-05dbed45d998-5C7GfCeVMHo@public.gmane.org>
2017-05-19 21:28 ` Borislav Petkov
2017-05-19 21:38 ` Tom Lendacky
2017-05-26 4:17 ` Xunlei Pang
[not found] ` <5927AC6E.8080209-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-05-27 2:17 ` Dave Young
2017-05-30 17:46 ` Tom Lendacky
[not found] ` <de4d2efc-6636-4120-98d9-7fdf4707f68d-5C7GfCeVMHo@public.gmane.org>
2017-05-31 10:01 ` Borislav Petkov
2017-05-31 15:03 ` Xunlei Pang
2017-05-31 15:48 ` Borislav Petkov
2017-04-18 21:21 ` [PATCH v5 29/32] x86/mm: Add support to encrypt the kernel in-place Tom Lendacky
[not found] ` <20170418212149.10190.70894.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2017-05-18 12:46 ` Borislav Petkov
2017-05-25 22:24 ` Tom Lendacky
2017-05-26 16:25 ` Borislav Petkov
2017-05-30 16:39 ` Tom Lendacky
2017-05-31 9:51 ` Borislav Petkov
[not found] ` <20170531095148.pba6ju6im4qxbwfg-fF5Pk5pvG8Y@public.gmane.org>
2017-05-31 13:12 ` Tom Lendacky
2017-04-18 21:22 ` [PATCH v5 30/32] x86/boot: Add early cmdline parsing for options with arguments Tom Lendacky
2017-04-18 21:22 ` [PATCH v5 32/32] x86/mm: Add support to make use of Secure Memory Encryption Tom Lendacky
2017-04-21 18:56 ` Tom Lendacky
2017-05-19 11:30 ` Borislav Petkov
2017-05-19 20:16 ` Josh Poimboeuf
2017-05-19 20:29 ` Borislav Petkov
2017-05-30 15:48 ` Tom Lendacky
[not found] ` <1ac40d18-a8b2-94eb-35ed-c30768667be8-5C7GfCeVMHo@public.gmane.org>
2017-05-31 9:15 ` Borislav Petkov
2017-05-30 15:46 ` Tom Lendacky
2017-05-19 11:27 ` Borislav Petkov
2017-05-30 14:38 ` Tom Lendacky
2017-05-30 14:55 ` Borislav Petkov
2017-05-30 15:37 ` Tom Lendacky
2017-05-31 8:49 ` Borislav Petkov
2017-05-31 13:37 ` Tom Lendacky
2017-05-31 14:12 ` Borislav Petkov
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