[GIT pull] x86/urgent for v5.18-rc1

From: Thomas Gleixner
Date: Sun Apr 03 2022 - 04:54:12 EST

Linus,

please pull the latest x86/urgent branch from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-urgent-2022-04-03

up to: d6d6d50f1e80: x86/fpu/xstate: Consolidate size calculations


A set of x86 fixes and updates:

- Make the prctl() for enabling dynamic XSTATE components correct so it
adds the newly requested feature to the permission bitmap instead of
overwriting it. Add a selftest which validates that.

- Unroll string MMIO for encrypted SEV guests as the hypervisor cannot
emulate it.

- Handle supervisor states correctly in the FPU/XSTATE code so it takes
the feature set of the fpstate buffer into account. The feature sets
can differ between host and guest buffers. Guest buffers do not contain
supervisor states. So far this was not an issue, but with enabling
PASID it needs to be handled in the buffer offset calculation and in
the permission bitmaps.

- Avoid a gazillion of repeated CPUID invocations in by caching the values
early in the FPU/XSTATE code.

- Enable CONFIG_WERROR for X86.

- Make the X86 defconfigs more useful by adapting them to Y2022 reality.

Thanks,

tglx

------------------>
Borislav Petkov (1):
x86/defconfig: Enable WERROR

Chang S. Bae (1):
selftests/x86/amx: Update the ARCH_REQ_XCOMP_PERM test

Ingo Molnar (1):
x86/config: Make the x86 defconfigs a bit more usable

Joerg Roedel (1):
x86/sev: Unroll string mmio with CC_ATTR_GUEST_UNROLL_STRING_IO

Thomas Gleixner (7):
x86/fpu: Remove redundant XCOMP_BV initialization
x86/fpu: Remove unused supervisor only offsets
x86/fpu/xsave: Initialize offset/size cache early
x86/fpu: Cache xfeature flags from CPUID
x86/fpu/xsave: Handle compacted offsets correctly with supervisor states
x86/fpu/xstate: Handle supervisor states in XSTATE permissions
x86/fpu/xstate: Consolidate size calculations

Yang Zhong (1):
x86/fpu/xstate: Fix the ARCH_REQ_XCOMP_PERM implementation


arch/x86/configs/i386_defconfig | 50 ++++++---
arch/x86/configs/x86_64_defconfig | 37 +++++--
arch/x86/kernel/fpu/core.c | 3 -
arch/x86/kernel/fpu/xstate.c | 216 ++++++++++++--------------------------
arch/x86/lib/iomem.c | 65 ++++++++++--
tools/testing/selftests/x86/amx.c | 16 ++-
6 files changed, 200 insertions(+), 187 deletions(-)

diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
index 71124cf8630c..98a4852ed6a0 100644
--- a/arch/x86/configs/i386_defconfig
+++ b/arch/x86/configs/i386_defconfig
@@ -1,5 +1,7 @@
+CONFIG_WERROR=y
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
+CONFIG_USELIB=y
CONFIG_AUDIT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
@@ -11,23 +13,30 @@ CONFIG_TASK_XACCT=y
CONFIG_TASK_IO_ACCOUNTING=y
CONFIG_LOG_BUF_SHIFT=18
CONFIG_CGROUPS=y
+CONFIG_BLK_CGROUP=y
CONFIG_CGROUP_SCHED=y
+CONFIG_CGROUP_PIDS=y
+CONFIG_CGROUP_RDMA=y
CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_HUGETLB=y
CONFIG_CPUSETS=y
+CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_CPUACCT=y
+CONFIG_CGROUP_PERF=y
+CONFIG_CGROUP_MISC=y
+CONFIG_CGROUP_DEBUG=y
CONFIG_BLK_DEV_INITRD=y
+CONFIG_KALLSYMS_ALL=y
# CONFIG_COMPAT_BRK is not set
CONFIG_PROFILING=y
-# CONFIG_64BIT is not set
CONFIG_SMP=y
-CONFIG_X86_GENERIC=y
-CONFIG_HPET_TIMER=y
+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_PARAVIRT=y
+CONFIG_NR_CPUS=8
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
-CONFIG_X86_REBOOTFIXUPS=y
CONFIG_MICROCODE_AMD=y
CONFIG_X86_MSR=y
CONFIG_X86_CPUID=y
-CONFIG_HIGHPTE=y
CONFIG_X86_CHECK_BIOS_CORRUPTION=y
# CONFIG_MTRR_SANITIZER is not set
CONFIG_EFI=y
@@ -43,12 +52,15 @@ CONFIG_ACPI_BGRT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_X86_ACPI_CPUFREQ=y
-CONFIG_EFI_VARS=y
CONFIG_KPROBES=y
CONFIG_JUMP_LABEL=y
+CONFIG_COMPAT_32BIT_TIME=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
+CONFIG_BLK_CGROUP_IOLATENCY=y
+CONFIG_BLK_CGROUP_IOCOST=y
+CONFIG_BLK_CGROUP_IOPRIO=y
CONFIG_BINFMT_MISC=y
CONFIG_NET=y
CONFIG_PACKET=y
@@ -103,12 +115,16 @@ CONFIG_IP6_NF_FILTER=y
CONFIG_IP6_NF_TARGET_REJECT=y
CONFIG_IP6_NF_MANGLE=y
CONFIG_NET_SCHED=y
+CONFIG_NET_CLS_CGROUP=y
CONFIG_NET_EMATCH=y
CONFIG_NET_CLS_ACT=y
+CONFIG_CGROUP_NET_PRIO=y
CONFIG_CFG80211=y
CONFIG_MAC80211=y
CONFIG_MAC80211_LEDS=y
CONFIG_RFKILL=y
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y
CONFIG_PCI=y
CONFIG_PCIEPORTBUS=y
CONFIG_PCI_MSI=y
@@ -119,13 +135,16 @@ CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_DEBUG_DEVRES=y
CONFIG_CONNECTOR=y
+CONFIG_EFI_VARS=y
+CONFIG_EFI_CAPSULE_LOADER=y
CONFIG_BLK_DEV_LOOP=y
+CONFIG_VIRTIO_BLK=y
CONFIG_BLK_DEV_SD=y
CONFIG_BLK_DEV_SR=y
CONFIG_CHR_DEV_SG=y
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_SPI_ATTRS=y
-# CONFIG_SCSI_LOWLEVEL is not set
+CONFIG_SCSI_VIRTIO=y
CONFIG_ATA=y
CONFIG_SATA_AHCI=y
CONFIG_ATA_PIIX=y
@@ -143,6 +162,7 @@ CONFIG_MACINTOSH_DRIVERS=y
CONFIG_MAC_EMUMOUSEBTN=y
CONFIG_NETDEVICES=y
CONFIG_NETCONSOLE=y
+CONFIG_VIRTIO_NET=y
CONFIG_BNX2=y
CONFIG_TIGON3=y
CONFIG_NET_TULIP=y
@@ -170,6 +190,7 @@ CONFIG_SERIAL_8250_SHARE_IRQ=y
CONFIG_SERIAL_8250_DETECT_IRQ=y
CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_NONSTANDARD=y
+CONFIG_VIRTIO_CONSOLE=y
CONFIG_HW_RANDOM=y
CONFIG_NVRAM=y
CONFIG_HPET=y
@@ -181,12 +202,7 @@ CONFIG_AGP_AMD64=y
CONFIG_AGP_INTEL=y
CONFIG_DRM=y
CONFIG_DRM_I915=y
-CONFIG_FB_MODE_HELPERS=y
-CONFIG_FB_TILEBLITTING=y
-CONFIG_FB_EFI=y
-CONFIG_LOGO=y
-# CONFIG_LOGO_LINUX_MONO is not set
-# CONFIG_LOGO_LINUX_VGA16 is not set
+CONFIG_DRM_VIRTIO_GPU=y
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_HRTIMER=y
@@ -219,6 +235,8 @@ CONFIG_USB_STORAGE=y
CONFIG_RTC_CLASS=y
# CONFIG_RTC_HCTOSYS is not set
CONFIG_DMADEVICES=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_INPUT=y
CONFIG_EEEPC_LAPTOP=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_POSIX_ACL=y
@@ -240,6 +258,7 @@ CONFIG_NFS_FS=y
CONFIG_NFS_V3_ACL=y
CONFIG_NFS_V4=y
CONFIG_ROOT_NFS=y
+CONFIG_9P_FS=y
CONFIG_NLS_DEFAULT="utf8"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ASCII=y
@@ -251,14 +270,15 @@ CONFIG_SECURITY_SELINUX=y
CONFIG_SECURITY_SELINUX_BOOTPARAM=y
CONFIG_SECURITY_SELINUX_DISABLE=y
CONFIG_PRINTK_TIME=y
+CONFIG_FRAME_WARN=1024
CONFIG_MAGIC_SYSRQ=y
CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_STACK_USAGE=y
-CONFIG_DEBUG_STACKOVERFLOW=y
# CONFIG_SCHED_DEBUG is not set
CONFIG_SCHEDSTATS=y
CONFIG_BLK_DEV_IO_TRACE=y
CONFIG_PROVIDE_OHCI1394_DMA_INIT=y
CONFIG_EARLY_PRINTK_DBGP=y
CONFIG_DEBUG_BOOT_PARAMS=y
-CONFIG_KALLSYMS_ALL=y
+CONFIG_UNWINDER_FRAME_POINTER=y
+# CONFIG_64BIT is not set
diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
index 92b1169ec90b..69784505a7a8 100644
--- a/arch/x86/configs/x86_64_defconfig
+++ b/arch/x86/configs/x86_64_defconfig
@@ -1,3 +1,4 @@
+CONFIG_WERROR=y
CONFIG_SYSVIPC=y
CONFIG_POSIX_MQUEUE=y
CONFIG_AUDIT=y
@@ -11,14 +12,25 @@ CONFIG_TASK_XACCT=y
CONFIG_TASK_IO_ACCOUNTING=y
CONFIG_LOG_BUF_SHIFT=18
CONFIG_CGROUPS=y
+CONFIG_BLK_CGROUP=y
CONFIG_CGROUP_SCHED=y
+CONFIG_CGROUP_PIDS=y
+CONFIG_CGROUP_RDMA=y
CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_HUGETLB=y
CONFIG_CPUSETS=y
+CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_CPUACCT=y
+CONFIG_CGROUP_PERF=y
+CONFIG_CGROUP_MISC=y
+CONFIG_CGROUP_DEBUG=y
CONFIG_BLK_DEV_INITRD=y
+CONFIG_KALLSYMS_ALL=y
# CONFIG_COMPAT_BRK is not set
CONFIG_PROFILING=y
CONFIG_SMP=y
+CONFIG_HYPERVISOR_GUEST=y
+CONFIG_PARAVIRT=y
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
CONFIG_MICROCODE_AMD=y
CONFIG_X86_MSR=y
@@ -41,12 +53,14 @@ CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_IA32_EMULATION=y
-CONFIG_EFI_VARS=y
CONFIG_KPROBES=y
CONFIG_JUMP_LABEL=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_MODULE_FORCE_UNLOAD=y
+CONFIG_BLK_CGROUP_IOLATENCY=y
+CONFIG_BLK_CGROUP_IOCOST=y
+CONFIG_BLK_CGROUP_IOPRIO=y
CONFIG_BINFMT_MISC=y
CONFIG_NET=y
CONFIG_PACKET=y
@@ -101,12 +115,16 @@ CONFIG_IP6_NF_FILTER=y
CONFIG_IP6_NF_TARGET_REJECT=y
CONFIG_IP6_NF_MANGLE=y
CONFIG_NET_SCHED=y
+CONFIG_NET_CLS_CGROUP=y
CONFIG_NET_EMATCH=y
CONFIG_NET_CLS_ACT=y
+CONFIG_CGROUP_NET_PRIO=y
CONFIG_CFG80211=y
CONFIG_MAC80211=y
CONFIG_MAC80211_LEDS=y
CONFIG_RFKILL=y
+CONFIG_NET_9P=y
+CONFIG_NET_9P_VIRTIO=y
CONFIG_PCI=y
CONFIG_PCIEPORTBUS=y
CONFIG_HOTPLUG_PCI=y
@@ -116,13 +134,15 @@ CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
CONFIG_DEBUG_DEVRES=y
CONFIG_CONNECTOR=y
+CONFIG_EFI_VARS=y
CONFIG_BLK_DEV_LOOP=y
+CONFIG_VIRTIO_BLK=y
CONFIG_BLK_DEV_SD=y
CONFIG_BLK_DEV_SR=y
CONFIG_CHR_DEV_SG=y
CONFIG_SCSI_CONSTANTS=y
CONFIG_SCSI_SPI_ATTRS=y
-# CONFIG_SCSI_LOWLEVEL is not set
+CONFIG_SCSI_VIRTIO=y
CONFIG_ATA=y
CONFIG_SATA_AHCI=y
CONFIG_ATA_PIIX=y
@@ -138,6 +158,7 @@ CONFIG_MACINTOSH_DRIVERS=y
CONFIG_MAC_EMUMOUSEBTN=y
CONFIG_NETDEVICES=y
CONFIG_NETCONSOLE=y
+CONFIG_VIRTIO_NET=y
CONFIG_TIGON3=y
CONFIG_NET_TULIP=y
CONFIG_E100=y
@@ -162,6 +183,7 @@ CONFIG_SERIAL_8250_SHARE_IRQ=y
CONFIG_SERIAL_8250_DETECT_IRQ=y
CONFIG_SERIAL_8250_RSA=y
CONFIG_SERIAL_NONSTANDARD=y
+CONFIG_VIRTIO_CONSOLE=y
CONFIG_HW_RANDOM=y
# CONFIG_HW_RANDOM_INTEL is not set
# CONFIG_HW_RANDOM_AMD is not set
@@ -175,12 +197,7 @@ CONFIG_AGP_AMD64=y
CONFIG_AGP_INTEL=y
CONFIG_DRM=y
CONFIG_DRM_I915=y
-CONFIG_FB_MODE_HELPERS=y
-CONFIG_FB_TILEBLITTING=y
-CONFIG_FB_EFI=y
-CONFIG_LOGO=y
-# CONFIG_LOGO_LINUX_MONO is not set
-# CONFIG_LOGO_LINUX_VGA16 is not set
+CONFIG_DRM_VIRTIO_GPU=y
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_HRTIMER=y
@@ -213,6 +230,8 @@ CONFIG_USB_STORAGE=y
CONFIG_RTC_CLASS=y
# CONFIG_RTC_HCTOSYS is not set
CONFIG_DMADEVICES=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_INPUT=y
CONFIG_EEEPC_LAPTOP=y
CONFIG_AMD_IOMMU=y
CONFIG_INTEL_IOMMU=y
@@ -237,6 +256,7 @@ CONFIG_NFS_FS=y
CONFIG_NFS_V3_ACL=y
CONFIG_NFS_V4=y
CONFIG_ROOT_NFS=y
+CONFIG_9P_FS=y
CONFIG_NLS_DEFAULT="utf8"
CONFIG_NLS_CODEPAGE_437=y
CONFIG_NLS_ASCII=y
@@ -257,4 +277,3 @@ CONFIG_BLK_DEV_IO_TRACE=y
CONFIG_PROVIDE_OHCI1394_DMA_INIT=y
CONFIG_EARLY_PRINTK_DBGP=y
CONFIG_DEBUG_BOOT_PARAMS=y
-CONFIG_KALLSYMS_ALL=y
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 19821f027cb3..c049561f373a 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -415,9 +415,6 @@ int fpu_copy_uabi_to_guest_fpstate(struct fpu_guest *gfpu, const void *buf,
xpkru = get_xsave_addr(&kstate->regs.xsave, XFEATURE_PKRU);
*vpkru = xpkru->pkru;
}
-
- /* Ensure that XCOMP_BV is set up for XSAVES */
- xstate_init_xcomp_bv(&kstate->regs.xsave, kstate->xfeatures);
return 0;
}
EXPORT_SYMBOL_GPL(fpu_copy_uabi_to_guest_fpstate);
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 7c7824ae7862..39e1c8626ab9 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -81,10 +81,10 @@ static unsigned int xstate_offsets[XFEATURE_MAX] __ro_after_init =
{ [ 0 ... XFEATURE_MAX - 1] = -1};
static unsigned int xstate_sizes[XFEATURE_MAX] __ro_after_init =
{ [ 0 ... XFEATURE_MAX - 1] = -1};
-static unsigned int xstate_comp_offsets[XFEATURE_MAX] __ro_after_init =
- { [ 0 ... XFEATURE_MAX - 1] = -1};
-static unsigned int xstate_supervisor_only_offsets[XFEATURE_MAX] __ro_after_init =
- { [ 0 ... XFEATURE_MAX - 1] = -1};
+static unsigned int xstate_flags[XFEATURE_MAX] __ro_after_init;
+
+#define XSTATE_FLAG_SUPERVISOR BIT(0)
+#define XSTATE_FLAG_ALIGNED64 BIT(1)

/*
* Return whether the system supports a given xfeature.
@@ -124,17 +124,41 @@ int cpu_has_xfeatures(u64 xfeatures_needed, const char **feature_name)
}
EXPORT_SYMBOL_GPL(cpu_has_xfeatures);

+static bool xfeature_is_aligned64(int xfeature_nr)
+{
+ return xstate_flags[xfeature_nr] & XSTATE_FLAG_ALIGNED64;
+}
+
static bool xfeature_is_supervisor(int xfeature_nr)
{
+ return xstate_flags[xfeature_nr] & XSTATE_FLAG_SUPERVISOR;
+}
+
+static unsigned int xfeature_get_offset(u64 xcomp_bv, int xfeature)
+{
+ unsigned int offs, i;
+
/*
- * Extended State Enumeration Sub-leaves (EAX = 0DH, ECX = n, n > 1)
- * returns ECX[0] set to (1) for a supervisor state, and cleared (0)
- * for a user state.
+ * Non-compacted format and legacy features use the cached fixed
+ * offsets.
*/
- u32 eax, ebx, ecx, edx;
+ if (!cpu_feature_enabled(X86_FEATURE_XSAVES) || xfeature <= XFEATURE_SSE)
+ return xstate_offsets[xfeature];

- cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
- return ecx & 1;
+ /*
+ * Compacted format offsets depend on the actual content of the
+ * compacted xsave area which is determined by the xcomp_bv header
+ * field.
+ */
+ offs = FXSAVE_SIZE + XSAVE_HDR_SIZE;
+ for_each_extended_xfeature(i, xcomp_bv) {
+ if (xfeature_is_aligned64(i))
+ offs = ALIGN(offs, 64);
+ if (i == xfeature)
+ break;
+ offs += xstate_sizes[i];
+ }
+ return offs;
}

/*
@@ -182,7 +206,7 @@ static bool xfeature_enabled(enum xfeature xfeature)
* Record the offsets and sizes of various xstates contained
* in the XSAVE state memory layout.
*/
-static void __init setup_xstate_features(void)
+static void __init setup_xstate_cache(void)
{
u32 eax, ebx, ecx, edx, i;
/* start at the beginning of the "extended state" */
@@ -205,6 +229,7 @@ static void __init setup_xstate_features(void)
cpuid_count(XSTATE_CPUID, i, &eax, &ebx, &ecx, &edx);

xstate_sizes[i] = eax;
+ xstate_flags[i] = ecx;

/*
* If an xfeature is supervisor state, the offset in EBX is
@@ -263,94 +288,6 @@ static void __init print_xstate_features(void)
WARN_ON(nr >= XFEATURE_MAX); \
} while (0)

-/*
- * We could cache this like xstate_size[], but we only use
- * it here, so it would be a waste of space.
- */
-static int xfeature_is_aligned(int xfeature_nr)
-{
- u32 eax, ebx, ecx, edx;
-
- CHECK_XFEATURE(xfeature_nr);
-
- if (!xfeature_enabled(xfeature_nr)) {
- WARN_ONCE(1, "Checking alignment of disabled xfeature %d\n",
- xfeature_nr);
- return 0;
- }
-
- cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
- /*
- * The value returned by ECX[1] indicates the alignment
- * of state component 'i' when the compacted format
- * of the extended region of an XSAVE area is used:
- */
- return !!(ecx & 2);
-}
-
-/*
- * This function sets up offsets and sizes of all extended states in
- * xsave area. This supports both standard format and compacted format
- * of the xsave area.
- */
-static void __init setup_xstate_comp_offsets(void)
-{
- unsigned int next_offset;
- int i;
-
- /*
- * The FP xstates and SSE xstates are legacy states. They are always
- * in the fixed offsets in the xsave area in either compacted form
- * or standard form.
- */
- xstate_comp_offsets[XFEATURE_FP] = 0;
- xstate_comp_offsets[XFEATURE_SSE] = offsetof(struct fxregs_state,
- xmm_space);
-
- if (!cpu_feature_enabled(X86_FEATURE_XSAVES)) {
- for_each_extended_xfeature(i, fpu_kernel_cfg.max_features)
- xstate_comp_offsets[i] = xstate_offsets[i];
- return;
- }
-
- next_offset = FXSAVE_SIZE + XSAVE_HDR_SIZE;
-
- for_each_extended_xfeature(i, fpu_kernel_cfg.max_features) {
- if (xfeature_is_aligned(i))
- next_offset = ALIGN(next_offset, 64);
-
- xstate_comp_offsets[i] = next_offset;
- next_offset += xstate_sizes[i];
- }
-}
-
-/*
- * Setup offsets of a supervisor-state-only XSAVES buffer:
- *
- * The offsets stored in xstate_comp_offsets[] only work for one specific
- * value of the Requested Feature BitMap (RFBM). In cases where a different
- * RFBM value is used, a different set of offsets is required. This set of
- * offsets is for when RFBM=xfeatures_mask_supervisor().
- */
-static void __init setup_supervisor_only_offsets(void)
-{
- unsigned int next_offset;
- int i;
-
- next_offset = FXSAVE_SIZE + XSAVE_HDR_SIZE;
-
- for_each_extended_xfeature(i, fpu_kernel_cfg.max_features) {
- if (!xfeature_is_supervisor(i))
- continue;
-
- if (xfeature_is_aligned(i))
- next_offset = ALIGN(next_offset, 64);
-
- xstate_supervisor_only_offsets[i] = next_offset;
- next_offset += xstate_sizes[i];
- }
-}
-
/*
* Print out xstate component offsets and sizes
*/
@@ -360,7 +297,8 @@ static void __init print_xstate_offset_size(void)

for_each_extended_xfeature(i, fpu_kernel_cfg.max_features) {
pr_info("x86/fpu: xstate_offset[%d]: %4d, xstate_sizes[%d]: %4d\n",
- i, xstate_comp_offsets[i], i, xstate_sizes[i]);
+ i, xfeature_get_offset(fpu_kernel_cfg.max_features, i),
+ i, xstate_sizes[i]);
}
}

@@ -419,7 +357,6 @@ static void __init setup_init_fpu_buf(void)
if (!boot_cpu_has(X86_FEATURE_XSAVE))
return;

- setup_xstate_features();
print_xstate_features();

xstate_init_xcomp_bv(&init_fpstate.regs.xsave, fpu_kernel_cfg.max_features);
@@ -448,25 +385,6 @@ static void __init setup_init_fpu_buf(void)
fxsave(&init_fpstate.regs.fxsave);
}

-static int xfeature_uncompacted_offset(int xfeature_nr)
-{
- u32 eax, ebx, ecx, edx;
-
- /*
- * Only XSAVES supports supervisor states and it uses compacted
- * format. Checking a supervisor state's uncompacted offset is
- * an error.
- */
- if (XFEATURE_MASK_SUPERVISOR_ALL & BIT_ULL(xfeature_nr)) {
- WARN_ONCE(1, "No fixed offset for xstate %d\n", xfeature_nr);
- return -1;
- }
-
- CHECK_XFEATURE(xfeature_nr);
- cpuid_count(XSTATE_CPUID, xfeature_nr, &eax, &ebx, &ecx, &edx);
- return ebx;
-}
-
int xfeature_size(int xfeature_nr)
{
u32 eax, ebx, ecx, edx;
@@ -644,29 +562,15 @@ static bool __init check_xstate_against_struct(int nr)

static unsigned int xstate_calculate_size(u64 xfeatures, bool compacted)
{
- unsigned int size = FXSAVE_SIZE + XSAVE_HDR_SIZE;
- int i;
+ unsigned int topmost = fls64(xfeatures) - 1;
+ unsigned int offset = xstate_offsets[topmost];

- for_each_extended_xfeature(i, xfeatures) {
- /* Align from the end of the previous feature */
- if (xfeature_is_aligned(i))
- size = ALIGN(size, 64);
- /*
- * In compacted format the enabled features are packed,
- * i.e. disabled features do not occupy space.
- *
- * In non-compacted format the offsets are fixed and
- * disabled states still occupy space in the memory buffer.
- */
- if (!compacted)
- size = xfeature_uncompacted_offset(i);
- /*
- * Add the feature size even for non-compacted format
- * to make the end result correct
- */
- size += xfeature_size(i);
- }
- return size;
+ if (topmost <= XFEATURE_SSE)
+ return sizeof(struct xregs_state);
+
+ if (compacted)
+ offset = xfeature_get_offset(xfeatures, topmost);
+ return offset + xstate_sizes[topmost];
}

/*
@@ -935,6 +839,10 @@ void __init fpu__init_system_xstate(unsigned int legacy_size)

/* Enable xstate instructions to be able to continue with initialization: */
fpu__init_cpu_xstate();
+
+ /* Cache size, offset and flags for initialization */
+ setup_xstate_cache();
+
err = init_xstate_size();
if (err)
goto out_disable;
@@ -950,8 +858,6 @@ void __init fpu__init_system_xstate(unsigned int legacy_size)
fpu_user_cfg.max_features);

setup_init_fpu_buf();
- setup_xstate_comp_offsets();
- setup_supervisor_only_offsets();

/*
* Paranoia check whether something in the setup modified the
@@ -1006,13 +912,19 @@ void fpu__resume_cpu(void)
*/
static void *__raw_xsave_addr(struct xregs_state *xsave, int xfeature_nr)
{
- if (!xfeature_enabled(xfeature_nr)) {
- WARN_ON_FPU(1);
+ u64 xcomp_bv = xsave->header.xcomp_bv;
+
+ if (WARN_ON_ONCE(!xfeature_enabled(xfeature_nr)))
return NULL;
+
+ if (cpu_feature_enabled(X86_FEATURE_XSAVES)) {
+ if (WARN_ON_ONCE(!(xcomp_bv & BIT_ULL(xfeature_nr))))
+ return NULL;
}

- return (void *)xsave + xstate_comp_offsets[xfeature_nr];
+ return (void *)xsave + xfeature_get_offset(xcomp_bv, xfeature_nr);
}
+
/*
* Given the xsave area and a state inside, this function returns the
* address of the state.
@@ -1043,8 +955,9 @@ void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr)
* We should not ever be requesting features that we
* have not enabled.
*/
- WARN_ONCE(!(fpu_kernel_cfg.max_features & BIT_ULL(xfeature_nr)),
- "get of unsupported state");
+ if (WARN_ON_ONCE(!xfeature_enabled(xfeature_nr)))
+ return NULL;
+
/*
* This assumes the last 'xsave*' instruction to
* have requested that 'xfeature_nr' be saved.
@@ -1625,6 +1538,9 @@ static int __xstate_request_perm(u64 permitted, u64 requested, bool guest)

/* Calculate the resulting kernel state size */
mask = permitted | requested;
+ /* Take supervisor states into account on the host */
+ if (!guest)
+ mask |= xfeatures_mask_supervisor();
ksize = xstate_calculate_size(mask, compacted);

/* Calculate the resulting user state size */
@@ -1639,7 +1555,7 @@ static int __xstate_request_perm(u64 permitted, u64 requested, bool guest)

perm = guest ? &fpu->guest_perm : &fpu->perm;
/* Pairs with the READ_ONCE() in xstate_get_group_perm() */
- WRITE_ONCE(perm->__state_perm, requested);
+ WRITE_ONCE(perm->__state_perm, mask);
/* Protected by sighand lock */
perm->__state_size = ksize;
perm->__user_state_size = usize;
diff --git a/arch/x86/lib/iomem.c b/arch/x86/lib/iomem.c
index df50451d94ef..3e2f33fc33de 100644
--- a/arch/x86/lib/iomem.c
+++ b/arch/x86/lib/iomem.c
@@ -22,7 +22,7 @@ static __always_inline void rep_movs(void *to, const void *from, size_t n)
: "memory");
}

-void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
+static void string_memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
{
if (unlikely(!n))
return;
@@ -38,9 +38,8 @@ void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
}
rep_movs(to, (const void *)from, n);
}
-EXPORT_SYMBOL(memcpy_fromio);

-void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
+static void string_memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
{
if (unlikely(!n))
return;
@@ -56,14 +55,64 @@ void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
}
rep_movs((void *)to, (const void *) from, n);
}
+
+static void unrolled_memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
+{
+ const volatile char __iomem *in = from;
+ char *out = to;
+ int i;
+
+ for (i = 0; i < n; ++i)
+ out[i] = readb(&in[i]);
+}
+
+static void unrolled_memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
+{
+ volatile char __iomem *out = to;
+ const char *in = from;
+ int i;
+
+ for (i = 0; i < n; ++i)
+ writeb(in[i], &out[i]);
+}
+
+static void unrolled_memset_io(volatile void __iomem *a, int b, size_t c)
+{
+ volatile char __iomem *mem = a;
+ int i;
+
+ for (i = 0; i < c; ++i)
+ writeb(b, &mem[i]);
+}
+
+void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n)
+{
+ if (cc_platform_has(CC_ATTR_GUEST_UNROLL_STRING_IO))
+ unrolled_memcpy_fromio(to, from, n);
+ else
+ string_memcpy_fromio(to, from, n);
+}
+EXPORT_SYMBOL(memcpy_fromio);
+
+void memcpy_toio(volatile void __iomem *to, const void *from, size_t n)
+{
+ if (cc_platform_has(CC_ATTR_GUEST_UNROLL_STRING_IO))
+ unrolled_memcpy_toio(to, from, n);
+ else
+ string_memcpy_toio(to, from, n);
+}
EXPORT_SYMBOL(memcpy_toio);

void memset_io(volatile void __iomem *a, int b, size_t c)
{
- /*
- * TODO: memset can mangle the IO patterns quite a bit.
- * perhaps it would be better to use a dumb one:
- */
- memset((void *)a, b, c);
+ if (cc_platform_has(CC_ATTR_GUEST_UNROLL_STRING_IO)) {
+ unrolled_memset_io(a, b, c);
+ } else {
+ /*
+ * TODO: memset can mangle the IO patterns quite a bit.
+ * perhaps it would be better to use a dumb one:
+ */
+ memset((void *)a, b, c);
+ }
}
EXPORT_SYMBOL(memset_io);
diff --git a/tools/testing/selftests/x86/amx.c b/tools/testing/selftests/x86/amx.c
index 3615ef4a48bb..2189f0322d8b 100644
--- a/tools/testing/selftests/x86/amx.c
+++ b/tools/testing/selftests/x86/amx.c
@@ -368,9 +368,16 @@ static void req_xtiledata_perm(void)

static void validate_req_xcomp_perm(enum expected_result exp)
{
- unsigned long bitmask;
+ unsigned long bitmask, expected_bitmask;
long rc;

+ rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_PERM, &bitmask);
+ if (rc) {
+ fatal_error("prctl(ARCH_GET_XCOMP_PERM) error: %ld", rc);
+ } else if (!(bitmask & XFEATURE_MASK_XTILECFG)) {
+ fatal_error("ARCH_GET_XCOMP_PERM returns XFEATURE_XTILECFG off.");
+ }
+
rc = syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_PERM, XFEATURE_XTILEDATA);
if (exp == FAIL_EXPECTED) {
if (rc) {
@@ -383,10 +390,15 @@ static void validate_req_xcomp_perm(enum expected_result exp)
fatal_error("ARCH_REQ_XCOMP_PERM saw unexpected failure.\n");
}

+ expected_bitmask = bitmask | XFEATURE_MASK_XTILEDATA;
+
rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_PERM, &bitmask);
if (rc) {
fatal_error("prctl(ARCH_GET_XCOMP_PERM) error: %ld", rc);
- } else if (bitmask & XFEATURE_MASK_XTILE) {
+ } else if (bitmask != expected_bitmask) {
+ fatal_error("ARCH_REQ_XCOMP_PERM set a wrong bitmask: %lx, expected: %lx.\n",
+ bitmask, expected_bitmask);
+ } else {
printf("\tARCH_REQ_XCOMP_PERM is successful.\n");
}
}