From 08f87f769b595151be1afeff53e144f543faa614 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 06 Dec 2023 09:51:13 +0000
Subject: [PATCH] add dts config
---
kernel/arch/x86/kvm/hyperv.c | 810 ++++++++++++++++++++++++++++++++++++++++++++------------
1 files changed, 629 insertions(+), 181 deletions(-)
diff --git a/kernel/arch/x86/kvm/hyperv.c b/kernel/arch/x86/kvm/hyperv.c
index 3fd6c4b..09ec1cd 100644
--- a/kernel/arch/x86/kvm/hyperv.c
+++ b/kernel/arch/x86/kvm/hyperv.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* KVM Microsoft Hyper-V emulation
*
@@ -15,17 +16,15 @@
* Amit Shah <amit.shah@qumranet.com>
* Ben-Ami Yassour <benami@il.ibm.com>
* Andrey Smetanin <asmetanin@virtuozzo.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- *
*/
#include "x86.h"
#include "lapic.h"
#include "ioapic.h"
+#include "cpuid.h"
#include "hyperv.h"
+#include <linux/cpu.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>
#include <linux/sched/cputime.h>
@@ -35,6 +34,12 @@
#include <trace/events/kvm.h>
#include "trace.h"
+#include "irq.h"
+
+#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64)
+
+static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
+ bool vcpu_kick);
static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
{
@@ -156,59 +161,24 @@
return (synic->active) ? synic : NULL;
}
-static void synic_clear_sint_msg_pending(struct kvm_vcpu_hv_synic *synic,
- u32 sint)
-{
- struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
- struct page *page;
- gpa_t gpa;
- struct hv_message *msg;
- struct hv_message_page *msg_page;
-
- gpa = synic->msg_page & PAGE_MASK;
- page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
- if (is_error_page(page)) {
- vcpu_err(vcpu, "Hyper-V SynIC can't get msg page, gpa 0x%llx\n",
- gpa);
- return;
- }
- msg_page = kmap_atomic(page);
-
- msg = &msg_page->sint_message[sint];
- msg->header.message_flags.msg_pending = 0;
-
- kunmap_atomic(msg_page);
- kvm_release_page_dirty(page);
- kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
-}
-
static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
{
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
struct kvm_vcpu_hv *hv_vcpu = vcpu_to_hv_vcpu(vcpu);
struct kvm_vcpu_hv_stimer *stimer;
- int gsi, idx, stimers_pending;
+ int gsi, idx;
trace_kvm_hv_notify_acked_sint(vcpu->vcpu_id, sint);
- if (synic->msg_page & HV_SYNIC_SIMP_ENABLE)
- synic_clear_sint_msg_pending(synic, sint);
-
/* Try to deliver pending Hyper-V SynIC timers messages */
- stimers_pending = 0;
for (idx = 0; idx < ARRAY_SIZE(hv_vcpu->stimer); idx++) {
stimer = &hv_vcpu->stimer[idx];
- if (stimer->msg_pending &&
- (stimer->config & HV_STIMER_ENABLE) &&
- HV_STIMER_SINT(stimer->config) == sint) {
- set_bit(stimer->index,
- hv_vcpu->stimer_pending_bitmap);
- stimers_pending++;
- }
+ if (stimer->msg_pending && stimer->config.enable &&
+ !stimer->config.direct_mode &&
+ stimer->config.sintx == sint)
+ stimer_mark_pending(stimer, false);
}
- if (stimers_pending)
- kvm_make_request(KVM_REQ_HV_STIMER, vcpu);
idx = srcu_read_lock(&kvm->irq_srcu);
gsi = atomic_read(&synic->sint_to_gsi[sint]);
@@ -237,7 +207,7 @@
struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
int ret;
- if (!synic->active && !host)
+ if (!synic->active && (!host || data))
return 1;
trace_kvm_hv_synic_set_msr(vcpu->vcpu_id, msr, data, host);
@@ -283,6 +253,9 @@
case HV_X64_MSR_EOM: {
int i;
+ if (!synic->active)
+ break;
+
for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
kvm_hv_notify_acked_sint(vcpu, i);
break;
@@ -295,6 +268,123 @@
break;
}
return ret;
+}
+
+static bool kvm_hv_is_syndbg_enabled(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *entry;
+
+ entry = kvm_find_cpuid_entry(vcpu,
+ HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES,
+ 0);
+ if (!entry)
+ return false;
+
+ return entry->eax & HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
+}
+
+static int kvm_hv_syndbg_complete_userspace(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_hv *hv = &kvm->arch.hyperv;
+
+ if (vcpu->run->hyperv.u.syndbg.msr == HV_X64_MSR_SYNDBG_CONTROL)
+ hv->hv_syndbg.control.status =
+ vcpu->run->hyperv.u.syndbg.status;
+ return 1;
+}
+
+static void syndbg_exit(struct kvm_vcpu *vcpu, u32 msr)
+{
+ struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
+ struct kvm_vcpu_hv *hv_vcpu = &vcpu->arch.hyperv;
+
+ hv_vcpu->exit.type = KVM_EXIT_HYPERV_SYNDBG;
+ hv_vcpu->exit.u.syndbg.msr = msr;
+ hv_vcpu->exit.u.syndbg.control = syndbg->control.control;
+ hv_vcpu->exit.u.syndbg.send_page = syndbg->control.send_page;
+ hv_vcpu->exit.u.syndbg.recv_page = syndbg->control.recv_page;
+ hv_vcpu->exit.u.syndbg.pending_page = syndbg->control.pending_page;
+ vcpu->arch.complete_userspace_io =
+ kvm_hv_syndbg_complete_userspace;
+
+ kvm_make_request(KVM_REQ_HV_EXIT, vcpu);
+}
+
+static int syndbg_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
+{
+ struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
+
+ if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
+ return 1;
+
+ trace_kvm_hv_syndbg_set_msr(vcpu->vcpu_id,
+ vcpu_to_hv_vcpu(vcpu)->vp_index, msr, data);
+ switch (msr) {
+ case HV_X64_MSR_SYNDBG_CONTROL:
+ syndbg->control.control = data;
+ if (!host)
+ syndbg_exit(vcpu, msr);
+ break;
+ case HV_X64_MSR_SYNDBG_STATUS:
+ syndbg->control.status = data;
+ break;
+ case HV_X64_MSR_SYNDBG_SEND_BUFFER:
+ syndbg->control.send_page = data;
+ break;
+ case HV_X64_MSR_SYNDBG_RECV_BUFFER:
+ syndbg->control.recv_page = data;
+ break;
+ case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
+ syndbg->control.pending_page = data;
+ if (!host)
+ syndbg_exit(vcpu, msr);
+ break;
+ case HV_X64_MSR_SYNDBG_OPTIONS:
+ syndbg->options = data;
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int syndbg_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
+{
+ struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
+
+ if (!kvm_hv_is_syndbg_enabled(vcpu) && !host)
+ return 1;
+
+ switch (msr) {
+ case HV_X64_MSR_SYNDBG_CONTROL:
+ *pdata = syndbg->control.control;
+ break;
+ case HV_X64_MSR_SYNDBG_STATUS:
+ *pdata = syndbg->control.status;
+ break;
+ case HV_X64_MSR_SYNDBG_SEND_BUFFER:
+ *pdata = syndbg->control.send_page;
+ break;
+ case HV_X64_MSR_SYNDBG_RECV_BUFFER:
+ *pdata = syndbg->control.recv_page;
+ break;
+ case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
+ *pdata = syndbg->control.pending_page;
+ break;
+ case HV_X64_MSR_SYNDBG_OPTIONS:
+ *pdata = syndbg->options;
+ break;
+ default:
+ break;
+ }
+
+ trace_kvm_hv_syndbg_get_msr(vcpu->vcpu_id,
+ vcpu_to_hv_vcpu(vcpu)->vp_index, msr,
+ *pdata);
+
+ return 0;
}
static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64 *pdata,
@@ -337,6 +427,9 @@
struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
struct kvm_lapic_irq irq;
int ret, vector;
+
+ if (KVM_BUG_ON(!lapic_in_kernel(vcpu), vcpu->kvm))
+ return -EINVAL;
if (sint >= ARRAY_SIZE(synic->sint))
return -EINVAL;
@@ -495,7 +588,7 @@
time_now = get_time_ref_counter(stimer_to_vcpu(stimer)->kvm);
ktime_now = ktime_get();
- if (stimer->config & HV_STIMER_PERIODIC) {
+ if (stimer->config.periodic) {
if (stimer->exp_time) {
if (time_now >= stimer->exp_time) {
u64 remainder;
@@ -544,36 +637,57 @@
static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
bool host)
{
+ union hv_stimer_config new_config = {.as_uint64 = config},
+ old_config = {.as_uint64 = stimer->config.as_uint64};
+ struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
+ struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
+
+ if (!synic->active && (!host || config))
+ return 1;
+
trace_kvm_hv_stimer_set_config(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, config, host);
stimer_cleanup(stimer);
- if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
- config &= ~HV_STIMER_ENABLE;
- stimer->config = config;
- stimer_mark_pending(stimer, false);
+ if (old_config.enable &&
+ !new_config.direct_mode && new_config.sintx == 0)
+ new_config.enable = 0;
+ stimer->config.as_uint64 = new_config.as_uint64;
+
+ if (stimer->config.enable)
+ stimer_mark_pending(stimer, false);
+
return 0;
}
static int stimer_set_count(struct kvm_vcpu_hv_stimer *stimer, u64 count,
bool host)
{
+ struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
+ struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
+
+ if (!synic->active && (!host || count))
+ return 1;
+
trace_kvm_hv_stimer_set_count(stimer_to_vcpu(stimer)->vcpu_id,
stimer->index, count, host);
stimer_cleanup(stimer);
stimer->count = count;
if (stimer->count == 0)
- stimer->config &= ~HV_STIMER_ENABLE;
- else if (stimer->config & HV_STIMER_AUTOENABLE)
- stimer->config |= HV_STIMER_ENABLE;
- stimer_mark_pending(stimer, false);
+ stimer->config.enable = 0;
+ else if (stimer->config.auto_enable)
+ stimer->config.enable = 1;
+
+ if (stimer->config.enable)
+ stimer_mark_pending(stimer, false);
+
return 0;
}
static int stimer_get_config(struct kvm_vcpu_hv_stimer *stimer, u64 *pconfig)
{
- *pconfig = stimer->config;
+ *pconfig = stimer->config.as_uint64;
return 0;
}
@@ -584,44 +698,60 @@
}
static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
- struct hv_message *src_msg)
+ struct hv_message *src_msg, bool no_retry)
{
struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
- struct page *page;
- gpa_t gpa;
- struct hv_message *dst_msg;
+ int msg_off = offsetof(struct hv_message_page, sint_message[sint]);
+ gfn_t msg_page_gfn;
+ struct hv_message_header hv_hdr;
int r;
- struct hv_message_page *msg_page;
if (!(synic->msg_page & HV_SYNIC_SIMP_ENABLE))
return -ENOENT;
- gpa = synic->msg_page & PAGE_MASK;
- page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
- if (is_error_page(page))
- return -EFAULT;
+ msg_page_gfn = synic->msg_page >> PAGE_SHIFT;
- msg_page = kmap_atomic(page);
- dst_msg = &msg_page->sint_message[sint];
- if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
- src_msg->header.message_type) != HVMSG_NONE) {
- dst_msg->header.message_flags.msg_pending = 1;
- r = -EAGAIN;
- } else {
- memcpy(&dst_msg->u.payload, &src_msg->u.payload,
- src_msg->header.payload_size);
- dst_msg->header.message_type = src_msg->header.message_type;
- dst_msg->header.payload_size = src_msg->header.payload_size;
- r = synic_set_irq(synic, sint);
- if (r >= 1)
- r = 0;
- else if (r == 0)
- r = -EFAULT;
+ /*
+ * Strictly following the spec-mandated ordering would assume setting
+ * .msg_pending before checking .message_type. However, this function
+ * is only called in vcpu context so the entire update is atomic from
+ * guest POV and thus the exact order here doesn't matter.
+ */
+ r = kvm_vcpu_read_guest_page(vcpu, msg_page_gfn, &hv_hdr.message_type,
+ msg_off + offsetof(struct hv_message,
+ header.message_type),
+ sizeof(hv_hdr.message_type));
+ if (r < 0)
+ return r;
+
+ if (hv_hdr.message_type != HVMSG_NONE) {
+ if (no_retry)
+ return 0;
+
+ hv_hdr.message_flags.msg_pending = 1;
+ r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn,
+ &hv_hdr.message_flags,
+ msg_off +
+ offsetof(struct hv_message,
+ header.message_flags),
+ sizeof(hv_hdr.message_flags));
+ if (r < 0)
+ return r;
+ return -EAGAIN;
}
- kunmap_atomic(msg_page);
- kvm_release_page_dirty(page);
- kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
- return r;
+
+ r = kvm_vcpu_write_guest_page(vcpu, msg_page_gfn, src_msg, msg_off,
+ sizeof(src_msg->header) +
+ src_msg->header.payload_size);
+ if (r < 0)
+ return r;
+
+ r = synic_set_irq(synic, sint);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ return -EFAULT;
+ return 0;
}
static int stimer_send_msg(struct kvm_vcpu_hv_stimer *stimer)
@@ -631,24 +761,47 @@
struct hv_timer_message_payload *payload =
(struct hv_timer_message_payload *)&msg->u.payload;
+ /*
+ * To avoid piling up periodic ticks, don't retry message
+ * delivery for them (within "lazy" lost ticks policy).
+ */
+ bool no_retry = stimer->config.periodic;
+
payload->expiration_time = stimer->exp_time;
payload->delivery_time = get_time_ref_counter(vcpu->kvm);
return synic_deliver_msg(vcpu_to_synic(vcpu),
- HV_STIMER_SINT(stimer->config), msg);
+ stimer->config.sintx, msg,
+ no_retry);
+}
+
+static int stimer_notify_direct(struct kvm_vcpu_hv_stimer *stimer)
+{
+ struct kvm_vcpu *vcpu = stimer_to_vcpu(stimer);
+ struct kvm_lapic_irq irq = {
+ .delivery_mode = APIC_DM_FIXED,
+ .vector = stimer->config.apic_vector
+ };
+
+ if (lapic_in_kernel(vcpu))
+ return !kvm_apic_set_irq(vcpu, &irq, NULL);
+ return 0;
}
static void stimer_expiration(struct kvm_vcpu_hv_stimer *stimer)
{
- int r;
+ int r, direct = stimer->config.direct_mode;
stimer->msg_pending = true;
- r = stimer_send_msg(stimer);
+ if (!direct)
+ r = stimer_send_msg(stimer);
+ else
+ r = stimer_notify_direct(stimer);
trace_kvm_hv_stimer_expiration(stimer_to_vcpu(stimer)->vcpu_id,
- stimer->index, r);
+ stimer->index, direct, r);
if (!r) {
stimer->msg_pending = false;
- if (!(stimer->config & HV_STIMER_PERIODIC))
- stimer->config &= ~HV_STIMER_ENABLE;
+ if (!(stimer->config.periodic))
+ stimer->config.enable = 0;
}
}
@@ -662,7 +815,7 @@
for (i = 0; i < ARRAY_SIZE(hv_vcpu->stimer); i++)
if (test_and_clear_bit(i, hv_vcpu->stimer_pending_bitmap)) {
stimer = &hv_vcpu->stimer[i];
- if (stimer->config & HV_STIMER_ENABLE) {
+ if (stimer->config.enable) {
exp_time = stimer->exp_time;
if (exp_time) {
@@ -672,7 +825,7 @@
stimer_expiration(stimer);
}
- if ((stimer->config & HV_STIMER_ENABLE) &&
+ if ((stimer->config.enable) &&
stimer->count) {
if (!stimer->msg_pending)
stimer_start(stimer);
@@ -758,11 +911,13 @@
/*
* Hyper-V SynIC auto EOI SINT's are
- * not compatible with APICV, so deactivate APICV
+ * not compatible with APICV, so request
+ * to deactivate APICV permanently.
*/
- kvm_vcpu_deactivate_apicv(vcpu);
+ kvm_request_apicv_update(vcpu->kvm, false, APICV_INHIBIT_REASON_HYPERV);
synic->active = true;
synic->dont_zero_synic_pages = dont_zero_synic_pages;
+ synic->control = HV_SYNIC_CONTROL_ENABLE;
return 0;
}
@@ -781,6 +936,8 @@
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
case HV_X64_MSR_TSC_EMULATION_CONTROL:
case HV_X64_MSR_TSC_EMULATION_STATUS:
+ case HV_X64_MSR_SYNDBG_OPTIONS:
+ case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
r = true;
break;
}
@@ -814,9 +971,9 @@
struct kvm_hv *hv = &vcpu->kvm->arch.hyperv;
if (host)
- hv->hv_crash_ctl = data & HV_X64_MSR_CRASH_CTL_NOTIFY;
+ hv->hv_crash_ctl = data & HV_CRASH_CTL_CRASH_NOTIFY;
- if (!host && (data & HV_X64_MSR_CRASH_CTL_NOTIFY)) {
+ if (!host && (data & HV_CRASH_CTL_CRASH_NOTIFY)) {
vcpu_debug(vcpu, "hv crash (0x%llx 0x%llx 0x%llx 0x%llx 0x%llx)\n",
hv->hv_crash_param[0],
@@ -881,7 +1038,7 @@
* These two equivalencies are implemented in this function.
*/
static bool compute_tsc_page_parameters(struct pvclock_vcpu_time_info *hv_clock,
- HV_REFERENCE_TSC_PAGE *tsc_ref)
+ struct ms_hyperv_tsc_page *tsc_ref)
{
u64 max_mul;
@@ -922,7 +1079,7 @@
u64 gfn;
BUILD_BUG_ON(sizeof(tsc_seq) != sizeof(hv->tsc_ref.tsc_sequence));
- BUILD_BUG_ON(offsetof(HV_REFERENCE_TSC_PAGE, tsc_sequence) != 0);
+ BUILD_BUG_ON(offsetof(struct ms_hyperv_tsc_page, tsc_sequence) != 0);
if (!(hv->hv_tsc_page & HV_X64_MSR_TSC_REFERENCE_ENABLE))
return;
@@ -1003,7 +1160,7 @@
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr))
return 1;
- kvm_x86_ops->patch_hypercall(vcpu, instructions);
+ kvm_x86_ops.patch_hypercall(vcpu, instructions);
((unsigned char *)instructions)[3] = 0xc3; /* ret */
if (__copy_to_user((void __user *)addr, instructions, 4))
return 1;
@@ -1042,8 +1199,11 @@
if (!host)
return 1;
break;
+ case HV_X64_MSR_SYNDBG_OPTIONS:
+ case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
+ return syndbg_set_msr(vcpu, msr, data, host);
default:
- vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
+ vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
msr, data);
return 1;
}
@@ -1104,7 +1264,13 @@
addr = kvm_vcpu_gfn_to_hva(vcpu, gfn);
if (kvm_is_error_hva(addr))
return 1;
- if (__clear_user((void __user *)addr, PAGE_SIZE))
+
+ /*
+ * Clear apic_assist portion of struct hv_vp_assist_page
+ * only, there can be valuable data in the rest which needs
+ * to be preserved e.g. on migration.
+ */
+ if (__put_user(0, (u32 __user *)addr))
return 1;
hv_vcpu->hv_vapic = data;
kvm_vcpu_mark_page_dirty(vcpu, gfn);
@@ -1157,7 +1323,7 @@
return 1;
break;
default:
- vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
+ vcpu_unimpl(vcpu, "Hyper-V unhandled wrmsr: 0x%x data 0x%llx\n",
msr, data);
return 1;
}
@@ -1165,7 +1331,8 @@
return 0;
}
-static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
+static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata,
+ bool host)
{
u64 data = 0;
struct kvm *kvm = vcpu->kvm;
@@ -1202,6 +1369,9 @@
case HV_X64_MSR_TSC_EMULATION_STATUS:
data = hv->hv_tsc_emulation_status;
break;
+ case HV_X64_MSR_SYNDBG_OPTIONS:
+ case HV_X64_MSR_SYNDBG_CONTROL ... HV_X64_MSR_SYNDBG_PENDING_BUFFER:
+ return syndbg_get_msr(vcpu, msr, pdata, host);
default:
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
@@ -1291,39 +1461,54 @@
int r;
mutex_lock(&vcpu->kvm->arch.hyperv.hv_lock);
- r = kvm_hv_get_msr_pw(vcpu, msr, pdata);
+ r = kvm_hv_get_msr_pw(vcpu, msr, pdata, host);
mutex_unlock(&vcpu->kvm->arch.hyperv.hv_lock);
return r;
} else
return kvm_hv_get_msr(vcpu, msr, pdata, host);
}
-static __always_inline int get_sparse_bank_no(u64 valid_bank_mask, int bank_no)
+static __always_inline unsigned long *sparse_set_to_vcpu_mask(
+ struct kvm *kvm, u64 *sparse_banks, u64 valid_bank_mask,
+ u64 *vp_bitmap, unsigned long *vcpu_bitmap)
{
- int i = 0, j;
+ struct kvm_hv *hv = &kvm->arch.hyperv;
+ struct kvm_vcpu *vcpu;
+ int i, bank, sbank = 0;
- if (!(valid_bank_mask & BIT_ULL(bank_no)))
- return -1;
+ memset(vp_bitmap, 0,
+ KVM_HV_MAX_SPARSE_VCPU_SET_BITS * sizeof(*vp_bitmap));
+ for_each_set_bit(bank, (unsigned long *)&valid_bank_mask,
+ KVM_HV_MAX_SPARSE_VCPU_SET_BITS)
+ vp_bitmap[bank] = sparse_banks[sbank++];
- for (j = 0; j < bank_no; j++)
- if (valid_bank_mask & BIT_ULL(j))
- i++;
+ if (likely(!atomic_read(&hv->num_mismatched_vp_indexes))) {
+ /* for all vcpus vp_index == vcpu_idx */
+ return (unsigned long *)vp_bitmap;
+ }
- return i;
+ bitmap_zero(vcpu_bitmap, KVM_MAX_VCPUS);
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (test_bit(vcpu_to_hv_vcpu(vcpu)->vp_index,
+ (unsigned long *)vp_bitmap))
+ __set_bit(i, vcpu_bitmap);
+ }
+ return vcpu_bitmap;
}
static u64 kvm_hv_flush_tlb(struct kvm_vcpu *current_vcpu, u64 ingpa,
u16 rep_cnt, bool ex)
{
struct kvm *kvm = current_vcpu->kvm;
- struct kvm_vcpu_hv *hv_current = ¤t_vcpu->arch.hyperv;
+ struct kvm_vcpu_hv *hv_vcpu = ¤t_vcpu->arch.hyperv;
struct hv_tlb_flush_ex flush_ex;
struct hv_tlb_flush flush;
- struct kvm_vcpu *vcpu;
- unsigned long vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)] = {0};
- unsigned long valid_bank_mask = 0;
+ u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
+ DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
+ unsigned long *vcpu_mask;
+ u64 valid_bank_mask;
u64 sparse_banks[64];
- int sparse_banks_len, i;
+ int sparse_banks_len;
bool all_cpus;
if (!ex) {
@@ -1333,6 +1518,7 @@
trace_kvm_hv_flush_tlb(flush.processor_mask,
flush.address_space, flush.flags);
+ valid_bank_mask = BIT_ULL(0);
sparse_banks[0] = flush.processor_mask;
/*
@@ -1358,7 +1544,8 @@
all_cpus = flush_ex.hv_vp_set.format !=
HV_GENERIC_SET_SPARSE_4K;
- sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) *
+ sparse_banks_len =
+ bitmap_weight((unsigned long *)&valid_bank_mask, 64) *
sizeof(sparse_banks[0]);
if (!sparse_banks_len && !all_cpus)
@@ -1373,48 +1560,18 @@
return HV_STATUS_INVALID_HYPERCALL_INPUT;
}
- cpumask_clear(&hv_current->tlb_lush);
+ cpumask_clear(&hv_vcpu->tlb_flush);
- kvm_for_each_vcpu(i, vcpu, kvm) {
- struct kvm_vcpu_hv *hv = &vcpu->arch.hyperv;
- int bank = hv->vp_index / 64, sbank = 0;
+ vcpu_mask = all_cpus ? NULL :
+ sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
+ vp_bitmap, vcpu_bitmap);
- if (!all_cpus) {
- /* Banks >64 can't be represented */
- if (bank >= 64)
- continue;
-
- /* Non-ex hypercalls can only address first 64 vCPUs */
- if (!ex && bank)
- continue;
-
- if (ex) {
- /*
- * Check is the bank of this vCPU is in sparse
- * set and get the sparse bank number.
- */
- sbank = get_sparse_bank_no(valid_bank_mask,
- bank);
-
- if (sbank < 0)
- continue;
- }
-
- if (!(sparse_banks[sbank] & BIT_ULL(hv->vp_index % 64)))
- continue;
- }
-
- /*
- * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we
- * can't analyze it here, flush TLB regardless of the specified
- * address space.
- */
- __set_bit(i, vcpu_bitmap);
- }
-
- kvm_make_vcpus_request_mask(kvm,
- KVM_REQ_TLB_FLUSH | KVM_REQUEST_NO_WAKEUP,
- vcpu_bitmap, &hv_current->tlb_lush);
+ /*
+ * vcpu->arch.cr3 may not be up-to-date for running vCPUs so we can't
+ * analyze it here, flush TLB regardless of the specified address space.
+ */
+ kvm_make_vcpus_request_mask(kvm, KVM_REQ_TLB_FLUSH_GUEST,
+ NULL, vcpu_mask, &hv_vcpu->tlb_flush);
ret_success:
/* We always do full TLB flush, set rep_done = rep_cnt. */
@@ -1422,9 +1579,105 @@
((u64)rep_cnt << HV_HYPERCALL_REP_COMP_OFFSET);
}
+static void kvm_send_ipi_to_many(struct kvm *kvm, u32 vector,
+ unsigned long *vcpu_bitmap)
+{
+ struct kvm_lapic_irq irq = {
+ .delivery_mode = APIC_DM_FIXED,
+ .vector = vector
+ };
+ struct kvm_vcpu *vcpu;
+ int i;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (vcpu_bitmap && !test_bit(i, vcpu_bitmap))
+ continue;
+
+ /* We fail only when APIC is disabled */
+ kvm_apic_set_irq(vcpu, &irq, NULL);
+ }
+}
+
+static u64 kvm_hv_send_ipi(struct kvm_vcpu *current_vcpu, u64 ingpa, u64 outgpa,
+ bool ex, bool fast)
+{
+ struct kvm *kvm = current_vcpu->kvm;
+ struct hv_send_ipi_ex send_ipi_ex;
+ struct hv_send_ipi send_ipi;
+ u64 vp_bitmap[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
+ DECLARE_BITMAP(vcpu_bitmap, KVM_MAX_VCPUS);
+ unsigned long *vcpu_mask;
+ unsigned long valid_bank_mask;
+ u64 sparse_banks[64];
+ int sparse_banks_len;
+ u32 vector;
+ bool all_cpus;
+
+ if (!ex) {
+ if (!fast) {
+ if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi,
+ sizeof(send_ipi))))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ sparse_banks[0] = send_ipi.cpu_mask;
+ vector = send_ipi.vector;
+ } else {
+ /* 'reserved' part of hv_send_ipi should be 0 */
+ if (unlikely(ingpa >> 32 != 0))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ sparse_banks[0] = outgpa;
+ vector = (u32)ingpa;
+ }
+ all_cpus = false;
+ valid_bank_mask = BIT_ULL(0);
+
+ trace_kvm_hv_send_ipi(vector, sparse_banks[0]);
+ } else {
+ if (unlikely(kvm_read_guest(kvm, ingpa, &send_ipi_ex,
+ sizeof(send_ipi_ex))))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+
+ trace_kvm_hv_send_ipi_ex(send_ipi_ex.vector,
+ send_ipi_ex.vp_set.format,
+ send_ipi_ex.vp_set.valid_bank_mask);
+
+ vector = send_ipi_ex.vector;
+ valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
+ sparse_banks_len = bitmap_weight(&valid_bank_mask, 64) *
+ sizeof(sparse_banks[0]);
+
+ all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;
+
+ if (all_cpus)
+ goto check_and_send_ipi;
+
+ if (!sparse_banks_len)
+ goto ret_success;
+
+ if (kvm_read_guest(kvm,
+ ingpa + offsetof(struct hv_send_ipi_ex,
+ vp_set.bank_contents),
+ sparse_banks,
+ sparse_banks_len))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+ }
+
+check_and_send_ipi:
+ if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
+ return HV_STATUS_INVALID_HYPERCALL_INPUT;
+
+ vcpu_mask = all_cpus ? NULL :
+ sparse_set_to_vcpu_mask(kvm, sparse_banks, valid_bank_mask,
+ vp_bitmap, vcpu_bitmap);
+
+ kvm_send_ipi_to_many(kvm, vector, vcpu_mask);
+
+ret_success:
+ return HV_STATUS_SUCCESS;
+}
+
bool kvm_hv_hypercall_enabled(struct kvm *kvm)
{
- return READ_ONCE(kvm->arch.hyperv.hv_hypercall) & HV_X64_MSR_HYPERCALL_ENABLE;
+ return READ_ONCE(kvm->arch.hyperv.hv_guest_os_id) != 0;
}
static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
@@ -1433,10 +1686,10 @@
longmode = is_64_bit_mode(vcpu);
if (longmode)
- kvm_register_write(vcpu, VCPU_REGS_RAX, result);
+ kvm_rax_write(vcpu, result);
else {
- kvm_register_write(vcpu, VCPU_REGS_RDX, result >> 32);
- kvm_register_write(vcpu, VCPU_REGS_RAX, result & 0xffffffff);
+ kvm_rdx_write(vcpu, result >> 32);
+ kvm_rax_write(vcpu, result & 0xffffffff);
}
}
@@ -1495,34 +1748,32 @@
{
u64 param, ingpa, outgpa, ret = HV_STATUS_SUCCESS;
uint16_t code, rep_idx, rep_cnt;
- bool fast, longmode, rep;
+ bool fast, rep;
/*
* hypercall generates UD from non zero cpl and real mode
* per HYPER-V spec
*/
- if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
+ if (kvm_x86_ops.get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
- longmode = is_64_bit_mode(vcpu);
-
- if (!longmode) {
- param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
- (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
- ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
- (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
- outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
- (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
- }
#ifdef CONFIG_X86_64
- else {
- param = kvm_register_read(vcpu, VCPU_REGS_RCX);
- ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
- outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
- }
+ if (is_64_bit_mode(vcpu)) {
+ param = kvm_rcx_read(vcpu);
+ ingpa = kvm_rdx_read(vcpu);
+ outgpa = kvm_r8_read(vcpu);
+ } else
#endif
+ {
+ param = ((u64)kvm_rdx_read(vcpu) << 32) |
+ (kvm_rax_read(vcpu) & 0xffffffff);
+ ingpa = ((u64)kvm_rbx_read(vcpu) << 32) |
+ (kvm_rcx_read(vcpu) & 0xffffffff);
+ outgpa = ((u64)kvm_rdi_read(vcpu) << 32) |
+ (kvm_rsi_read(vcpu) & 0xffffffff);
+ }
code = param & 0xffff;
fast = !!(param & HV_HYPERCALL_FAST_BIT);
@@ -1548,7 +1799,7 @@
ret = kvm_hvcall_signal_event(vcpu, fast, ingpa);
if (ret != HV_STATUS_INVALID_PORT_ID)
break;
- /* maybe userspace knows this conn_id: fall through */
+ fallthrough; /* maybe userspace knows this conn_id */
case HVCALL_POST_MESSAGE:
/* don't bother userspace if it has no way to handle it */
if (unlikely(rep || !vcpu_to_synic(vcpu)->active)) {
@@ -1591,6 +1842,48 @@
}
ret = kvm_hv_flush_tlb(vcpu, ingpa, rep_cnt, true);
break;
+ case HVCALL_SEND_IPI:
+ if (unlikely(rep)) {
+ ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+ break;
+ }
+ ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, false, fast);
+ break;
+ case HVCALL_SEND_IPI_EX:
+ if (unlikely(fast || rep)) {
+ ret = HV_STATUS_INVALID_HYPERCALL_INPUT;
+ break;
+ }
+ ret = kvm_hv_send_ipi(vcpu, ingpa, outgpa, true, false);
+ break;
+ case HVCALL_POST_DEBUG_DATA:
+ case HVCALL_RETRIEVE_DEBUG_DATA:
+ if (unlikely(fast)) {
+ ret = HV_STATUS_INVALID_PARAMETER;
+ break;
+ }
+ fallthrough;
+ case HVCALL_RESET_DEBUG_SESSION: {
+ struct kvm_hv_syndbg *syndbg = vcpu_to_hv_syndbg(vcpu);
+
+ if (!kvm_hv_is_syndbg_enabled(vcpu)) {
+ ret = HV_STATUS_INVALID_HYPERCALL_CODE;
+ break;
+ }
+
+ if (!(syndbg->options & HV_X64_SYNDBG_OPTION_USE_HCALLS)) {
+ ret = HV_STATUS_OPERATION_DENIED;
+ break;
+ }
+ vcpu->run->exit_reason = KVM_EXIT_HYPERV;
+ vcpu->run->hyperv.type = KVM_EXIT_HYPERV_HCALL;
+ vcpu->run->hyperv.u.hcall.input = param;
+ vcpu->run->hyperv.u.hcall.params[0] = ingpa;
+ vcpu->run->hyperv.u.hcall.params[1] = outgpa;
+ vcpu->arch.complete_userspace_io =
+ kvm_hv_hypercall_complete_userspace;
+ return 0;
+ }
default:
ret = HV_STATUS_INVALID_HYPERCALL_CODE;
break;
@@ -1627,7 +1920,7 @@
mutex_lock(&hv->hv_lock);
ret = idr_alloc(&hv->conn_to_evt, eventfd, conn_id, conn_id + 1,
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
mutex_unlock(&hv->hv_lock);
if (ret >= 0)
@@ -1666,3 +1959,158 @@
return kvm_hv_eventfd_deassign(kvm, args->conn_id);
return kvm_hv_eventfd_assign(kvm, args->conn_id, args->fd);
}
+
+int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
+ struct kvm_cpuid_entry2 __user *entries)
+{
+ uint16_t evmcs_ver = 0;
+ struct kvm_cpuid_entry2 cpuid_entries[] = {
+ { .function = HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS },
+ { .function = HYPERV_CPUID_INTERFACE },
+ { .function = HYPERV_CPUID_VERSION },
+ { .function = HYPERV_CPUID_FEATURES },
+ { .function = HYPERV_CPUID_ENLIGHTMENT_INFO },
+ { .function = HYPERV_CPUID_IMPLEMENT_LIMITS },
+ { .function = HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS },
+ { .function = HYPERV_CPUID_SYNDBG_INTERFACE },
+ { .function = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES },
+ { .function = HYPERV_CPUID_NESTED_FEATURES },
+ };
+ int i, nent = ARRAY_SIZE(cpuid_entries);
+
+ if (kvm_x86_ops.nested_ops->get_evmcs_version)
+ evmcs_ver = kvm_x86_ops.nested_ops->get_evmcs_version(vcpu);
+
+ /* Skip NESTED_FEATURES if eVMCS is not supported */
+ if (!evmcs_ver)
+ --nent;
+
+ if (cpuid->nent < nent)
+ return -E2BIG;
+
+ if (cpuid->nent > nent)
+ cpuid->nent = nent;
+
+ for (i = 0; i < nent; i++) {
+ struct kvm_cpuid_entry2 *ent = &cpuid_entries[i];
+ u32 signature[3];
+
+ switch (ent->function) {
+ case HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS:
+ memcpy(signature, "Linux KVM Hv", 12);
+
+ ent->eax = HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES;
+ ent->ebx = signature[0];
+ ent->ecx = signature[1];
+ ent->edx = signature[2];
+ break;
+
+ case HYPERV_CPUID_INTERFACE:
+ memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12);
+ ent->eax = signature[0];
+ break;
+
+ case HYPERV_CPUID_VERSION:
+ /*
+ * We implement some Hyper-V 2016 functions so let's use
+ * this version.
+ */
+ ent->eax = 0x00003839;
+ ent->ebx = 0x000A0000;
+ break;
+
+ case HYPERV_CPUID_FEATURES:
+ ent->eax |= HV_MSR_VP_RUNTIME_AVAILABLE;
+ ent->eax |= HV_MSR_TIME_REF_COUNT_AVAILABLE;
+ ent->eax |= HV_MSR_SYNIC_AVAILABLE;
+ ent->eax |= HV_MSR_SYNTIMER_AVAILABLE;
+ ent->eax |= HV_MSR_APIC_ACCESS_AVAILABLE;
+ ent->eax |= HV_MSR_HYPERCALL_AVAILABLE;
+ ent->eax |= HV_MSR_VP_INDEX_AVAILABLE;
+ ent->eax |= HV_MSR_RESET_AVAILABLE;
+ ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE;
+ ent->eax |= HV_ACCESS_FREQUENCY_MSRS;
+ ent->eax |= HV_ACCESS_REENLIGHTENMENT;
+
+ ent->ebx |= HV_POST_MESSAGES;
+ ent->ebx |= HV_SIGNAL_EVENTS;
+
+ ent->edx |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE;
+ ent->edx |= HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE;
+
+ ent->ebx |= HV_DEBUGGING;
+ ent->edx |= HV_X64_GUEST_DEBUGGING_AVAILABLE;
+ ent->edx |= HV_FEATURE_DEBUG_MSRS_AVAILABLE;
+
+ /*
+ * Direct Synthetic timers only make sense with in-kernel
+ * LAPIC
+ */
+ if (lapic_in_kernel(vcpu))
+ ent->edx |= HV_STIMER_DIRECT_MODE_AVAILABLE;
+
+ break;
+
+ case HYPERV_CPUID_ENLIGHTMENT_INFO:
+ ent->eax |= HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
+ ent->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
+ ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
+ ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED;
+ ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED;
+ if (evmcs_ver)
+ ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
+ if (!cpu_smt_possible())
+ ent->eax |= HV_X64_NO_NONARCH_CORESHARING;
+ /*
+ * Default number of spinlock retry attempts, matches
+ * HyperV 2016.
+ */
+ ent->ebx = 0x00000FFF;
+
+ break;
+
+ case HYPERV_CPUID_IMPLEMENT_LIMITS:
+ /* Maximum number of virtual processors */
+ ent->eax = KVM_MAX_VCPUS;
+ /*
+ * Maximum number of logical processors, matches
+ * HyperV 2016.
+ */
+ ent->ebx = 64;
+
+ break;
+
+ case HYPERV_CPUID_NESTED_FEATURES:
+ ent->eax = evmcs_ver;
+
+ break;
+
+ case HYPERV_CPUID_SYNDBG_VENDOR_AND_MAX_FUNCTIONS:
+ memcpy(signature, "Linux KVM Hv", 12);
+
+ ent->eax = 0;
+ ent->ebx = signature[0];
+ ent->ecx = signature[1];
+ ent->edx = signature[2];
+ break;
+
+ case HYPERV_CPUID_SYNDBG_INTERFACE:
+ memcpy(signature, "VS#1\0\0\0\0\0\0\0\0", 12);
+ ent->eax = signature[0];
+ break;
+
+ case HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES:
+ ent->eax |= HV_X64_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING;
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ if (copy_to_user(entries, cpuid_entries,
+ nent * sizeof(struct kvm_cpuid_entry2)))
+ return -EFAULT;
+
+ return 0;
+}
--
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