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authorLinus Torvalds <torvalds@linux-foundation.org>2023-08-05 03:16:14 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-08-05 03:16:14 +0300
commit024ff300db33968c133435a146d51ac22db27374 (patch)
treef94f8dda369a1ab86eca559742ed0f34f33c6a39 /arch
parente661f98c82832ddb76423f57dffb4ba6256e0fc6 (diff)
parent6ad0f2f91ad14ba0a3c2990c054fd6fbe8100429 (diff)
downloadlinux-024ff300db33968c133435a146d51ac22db27374.tar.xz
Merge tag 'hyperv-fixes-signed-20230804' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu: - Fix a bug in a python script for Hyper-V (Ani Sinha) - Workaround a bug in Hyper-V when IBT is enabled (Michael Kelley) - Fix an issue parsing MP table when Linux runs in VTL2 (Saurabh Sengar) - Several cleanup patches (Nischala Yelchuri, Kameron Carr, YueHaibing, ZhiHu) * tag 'hyperv-fixes-signed-20230804' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: Drivers: hv: vmbus: Remove unused extern declaration vmbus_ontimer() x86/hyperv: add noop functions to x86_init mpparse functions vmbus_testing: fix wrong python syntax for integer value comparison x86/hyperv: fix a warning in mshyperv.h x86/hyperv: Disable IBT when hypercall page lacks ENDBR instruction x86/hyperv: Improve code for referencing hyperv_pcpu_input_arg Drivers: hv: Change hv_free_hyperv_page() to take void * argument
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/hyperv/hv_apic.c4
-rw-r--r--arch/x86/hyperv/hv_init.c21
-rw-r--r--arch/x86/hyperv/hv_vtl.c4
-rw-r--r--arch/x86/hyperv/ivm.c7
-rw-r--r--arch/x86/hyperv/mmu.c12
-rw-r--r--arch/x86/hyperv/nested.c11
-rw-r--r--arch/x86/include/asm/mshyperv.h2
7 files changed, 34 insertions, 27 deletions
diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index 1fbda2f94184..b21335e6a210 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -107,7 +107,6 @@ static bool cpu_is_self(int cpu)
static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector,
bool exclude_self)
{
- struct hv_send_ipi_ex **arg;
struct hv_send_ipi_ex *ipi_arg;
unsigned long flags;
int nr_bank = 0;
@@ -117,9 +116,8 @@ static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector,
return false;
local_irq_save(flags);
- arg = (struct hv_send_ipi_ex **)this_cpu_ptr(hyperv_pcpu_input_arg);
+ ipi_arg = *this_cpu_ptr(hyperv_pcpu_input_arg);
- ipi_arg = *arg;
if (unlikely(!ipi_arg))
goto ipi_mask_ex_done;
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 6c04b52f139b..953e280c07c3 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -14,6 +14,7 @@
#include <asm/apic.h>
#include <asm/desc.h>
#include <asm/sev.h>
+#include <asm/ibt.h>
#include <asm/hypervisor.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
@@ -472,6 +473,26 @@ void __init hyperv_init(void)
}
/*
+ * Some versions of Hyper-V that provide IBT in guest VMs have a bug
+ * in that there's no ENDBR64 instruction at the entry to the
+ * hypercall page. Because hypercalls are invoked via an indirect call
+ * to the hypercall page, all hypercall attempts fail when IBT is
+ * enabled, and Linux panics. For such buggy versions, disable IBT.
+ *
+ * Fixed versions of Hyper-V always provide ENDBR64 on the hypercall
+ * page, so if future Linux kernel versions enable IBT for 32-bit
+ * builds, additional hypercall page hackery will be required here
+ * to provide an ENDBR32.
+ */
+#ifdef CONFIG_X86_KERNEL_IBT
+ if (cpu_feature_enabled(X86_FEATURE_IBT) &&
+ *(u32 *)hv_hypercall_pg != gen_endbr()) {
+ setup_clear_cpu_cap(X86_FEATURE_IBT);
+ pr_warn("Hyper-V: Disabling IBT because of Hyper-V bug\n");
+ }
+#endif
+
+ /*
* hyperv_init() is called before LAPIC is initialized: see
* apic_intr_mode_init() -> x86_platform.apic_post_init() and
* apic_bsp_setup() -> setup_local_APIC(). The direct-mode STIMER
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index 85d38b9f3586..db5d2ea39fc0 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -25,6 +25,10 @@ void __init hv_vtl_init_platform(void)
x86_init.irqs.pre_vector_init = x86_init_noop;
x86_init.timers.timer_init = x86_init_noop;
+ /* Avoid searching for BIOS MP tables */
+ x86_init.mpparse.find_smp_config = x86_init_noop;
+ x86_init.mpparse.get_smp_config = x86_init_uint_noop;
+
x86_platform.get_wallclock = get_rtc_noop;
x86_platform.set_wallclock = set_rtc_noop;
x86_platform.get_nmi_reason = hv_get_nmi_reason;
diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
index 14f46ad2ca64..28be6df88063 100644
--- a/arch/x86/hyperv/ivm.c
+++ b/arch/x86/hyperv/ivm.c
@@ -247,7 +247,7 @@ EXPORT_SYMBOL_GPL(hv_ghcb_msr_read);
static int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
enum hv_mem_host_visibility visibility)
{
- struct hv_gpa_range_for_visibility **input_pcpu, *input;
+ struct hv_gpa_range_for_visibility *input;
u16 pages_processed;
u64 hv_status;
unsigned long flags;
@@ -263,9 +263,8 @@ static int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
}
local_irq_save(flags);
- input_pcpu = (struct hv_gpa_range_for_visibility **)
- this_cpu_ptr(hyperv_pcpu_input_arg);
- input = *input_pcpu;
+ input = *this_cpu_ptr(hyperv_pcpu_input_arg);
+
if (unlikely(!input)) {
local_irq_restore(flags);
return -EINVAL;
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index 8460bd35e10c..1cc113200ff5 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -61,7 +61,6 @@ static void hyperv_flush_tlb_multi(const struct cpumask *cpus,
const struct flush_tlb_info *info)
{
int cpu, vcpu, gva_n, max_gvas;
- struct hv_tlb_flush **flush_pcpu;
struct hv_tlb_flush *flush;
u64 status;
unsigned long flags;
@@ -74,10 +73,7 @@ static void hyperv_flush_tlb_multi(const struct cpumask *cpus,
local_irq_save(flags);
- flush_pcpu = (struct hv_tlb_flush **)
- this_cpu_ptr(hyperv_pcpu_input_arg);
-
- flush = *flush_pcpu;
+ flush = *this_cpu_ptr(hyperv_pcpu_input_arg);
if (unlikely(!flush)) {
local_irq_restore(flags);
@@ -178,17 +174,13 @@ static u64 hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
const struct flush_tlb_info *info)
{
int nr_bank = 0, max_gvas, gva_n;
- struct hv_tlb_flush_ex **flush_pcpu;
struct hv_tlb_flush_ex *flush;
u64 status;
if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
return HV_STATUS_INVALID_PARAMETER;
- flush_pcpu = (struct hv_tlb_flush_ex **)
- this_cpu_ptr(hyperv_pcpu_input_arg);
-
- flush = *flush_pcpu;
+ flush = *this_cpu_ptr(hyperv_pcpu_input_arg);
if (info->mm) {
/*
diff --git a/arch/x86/hyperv/nested.c b/arch/x86/hyperv/nested.c
index 5d70968c8538..9dc259fa322e 100644
--- a/arch/x86/hyperv/nested.c
+++ b/arch/x86/hyperv/nested.c
@@ -19,7 +19,6 @@
int hyperv_flush_guest_mapping(u64 as)
{
- struct hv_guest_mapping_flush **flush_pcpu;
struct hv_guest_mapping_flush *flush;
u64 status;
unsigned long flags;
@@ -30,10 +29,7 @@ int hyperv_flush_guest_mapping(u64 as)
local_irq_save(flags);
- flush_pcpu = (struct hv_guest_mapping_flush **)
- this_cpu_ptr(hyperv_pcpu_input_arg);
-
- flush = *flush_pcpu;
+ flush = *this_cpu_ptr(hyperv_pcpu_input_arg);
if (unlikely(!flush)) {
local_irq_restore(flags);
@@ -90,7 +86,6 @@ EXPORT_SYMBOL_GPL(hyperv_fill_flush_guest_mapping_list);
int hyperv_flush_guest_mapping_range(u64 as,
hyperv_fill_flush_list_func fill_flush_list_func, void *data)
{
- struct hv_guest_mapping_flush_list **flush_pcpu;
struct hv_guest_mapping_flush_list *flush;
u64 status;
unsigned long flags;
@@ -102,10 +97,8 @@ int hyperv_flush_guest_mapping_range(u64 as,
local_irq_save(flags);
- flush_pcpu = (struct hv_guest_mapping_flush_list **)
- this_cpu_ptr(hyperv_pcpu_input_arg);
+ flush = *this_cpu_ptr(hyperv_pcpu_input_arg);
- flush = *flush_pcpu;
if (unlikely(!flush)) {
local_irq_restore(flags);
goto fault;
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 88d9ef98e087..fa83d88e4c99 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -5,7 +5,7 @@
#include <linux/types.h>
#include <linux/nmi.h>
#include <linux/msi.h>
-#include <asm/io.h>
+#include <linux/io.h>
#include <asm/hyperv-tlfs.h>
#include <asm/nospec-branch.h>
#include <asm/paravirt.h>