hyperv-fixes for 5.19-rc3

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Merge tag 'hyperv-fixes-signed-20220617' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv fixes from Wei Liu:

 - Fix hv_init_clocksource annotation (Masahiro Yamada)

 - Two bug fixes for vmbus driver (Saurabh Sengar)

 - Fix SEV negotiation (Tianyu Lan)

 - Fix comments in code (Xiang Wang)

 - One minor fix to HID driver (Michael Kelley)

* tag 'hyperv-fixes-signed-20220617' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM
  Drivers: hv: vmbus: Release cpu lock in error case
  HID: hyperv: Correctly access fields declared as __le16
  clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()
  Drivers: hv: Fix syntax errors in comments
  Drivers: hv: vmbus: Don't assign VMbus channel interrupts to isolated CPUs

arch/x86/hyperv/hv_init.c

@@ -13,6 +13,7 @@
 #include <linux/io.h>
 #include <asm/apic.h>
 #include <asm/desc.h>
+#include <asm/sev.h>
 #include <asm/hypervisor.h>
 #include <asm/hyperv-tlfs.h>
 #include <asm/mshyperv.h>
@@ -405,6 +406,11 @@ void __init hyperv_init(void)
 	}
 
 	if (hv_isolation_type_snp()) {
+		/* Negotiate GHCB Version. */
+		if (!hv_ghcb_negotiate_protocol())
+			hv_ghcb_terminate(SEV_TERM_SET_GEN,
+					  GHCB_SEV_ES_PROT_UNSUPPORTED);
+
 		hv_ghcb_pg = alloc_percpu(union hv_ghcb *);
 		if (!hv_ghcb_pg)
 			goto free_vp_assist_page;

arch/x86/hyperv/ivm.c

@@ -53,6 +53,8 @@ union hv_ghcb {
 	} hypercall;
 } __packed __aligned(HV_HYP_PAGE_SIZE);
 
+static u16 hv_ghcb_version __ro_after_init;
+
 u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size)
 {
 	union hv_ghcb *hv_ghcb;
@@ -96,12 +98,85 @@ u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size)
 	return status;
 }
 
+static inline u64 rd_ghcb_msr(void)
+{
+	return __rdmsr(MSR_AMD64_SEV_ES_GHCB);
+}
+
+static inline void wr_ghcb_msr(u64 val)
+{
+	native_wrmsrl(MSR_AMD64_SEV_ES_GHCB, val);
+}
+
+static enum es_result hv_ghcb_hv_call(struct ghcb *ghcb, u64 exit_code,
+				   u64 exit_info_1, u64 exit_info_2)
+{
+	/* Fill in protocol and format specifiers */
+	ghcb->protocol_version = hv_ghcb_version;
+	ghcb->ghcb_usage       = GHCB_DEFAULT_USAGE;
+
+	ghcb_set_sw_exit_code(ghcb, exit_code);
+	ghcb_set_sw_exit_info_1(ghcb, exit_info_1);
+	ghcb_set_sw_exit_info_2(ghcb, exit_info_2);
+
+	VMGEXIT();
+
+	if (ghcb->save.sw_exit_info_1 & GENMASK_ULL(31, 0))
+		return ES_VMM_ERROR;
+	else
+		return ES_OK;
+}
+
+void hv_ghcb_terminate(unsigned int set, unsigned int reason)
+{
+	u64 val = GHCB_MSR_TERM_REQ;
+
+	/* Tell the hypervisor what went wrong. */
+	val |= GHCB_SEV_TERM_REASON(set, reason);
+
+	/* Request Guest Termination from Hypvervisor */
+	wr_ghcb_msr(val);
+	VMGEXIT();
+
+	while (true)
+		asm volatile("hlt\n" : : : "memory");
+}
+
+bool hv_ghcb_negotiate_protocol(void)
+{
+	u64 ghcb_gpa;
+	u64 val;
+
+	/* Save ghcb page gpa. */
+	ghcb_gpa = rd_ghcb_msr();
+
+	/* Do the GHCB protocol version negotiation */
+	wr_ghcb_msr(GHCB_MSR_SEV_INFO_REQ);
+	VMGEXIT();
+	val = rd_ghcb_msr();
+
+	if (GHCB_MSR_INFO(val) != GHCB_MSR_SEV_INFO_RESP)
+		return false;
+
+	if (GHCB_MSR_PROTO_MAX(val) < GHCB_PROTOCOL_MIN ||
+	    GHCB_MSR_PROTO_MIN(val) > GHCB_PROTOCOL_MAX)
+		return false;
+
+	hv_ghcb_version = min_t(size_t, GHCB_MSR_PROTO_MAX(val),
+			     GHCB_PROTOCOL_MAX);
+
+	/* Write ghcb page back after negotiating protocol. */
+	wr_ghcb_msr(ghcb_gpa);
+	VMGEXIT();
+
+	return true;
+}
+
 void hv_ghcb_msr_write(u64 msr, u64 value)
 {
 	union hv_ghcb *hv_ghcb;
 	void **ghcb_base;
 	unsigned long flags;
-	struct es_em_ctxt ctxt;
 
 	if (!hv_ghcb_pg)
 		return;
@@ -120,8 +195,7 @@ void hv_ghcb_msr_write(u64 msr, u64 value)
 	ghcb_set_rax(&hv_ghcb->ghcb, lower_32_bits(value));
 	ghcb_set_rdx(&hv_ghcb->ghcb, upper_32_bits(value));
 
-	if (sev_es_ghcb_hv_call(&hv_ghcb->ghcb, false, &ctxt,
-				SVM_EXIT_MSR, 1, 0))
+	if (hv_ghcb_hv_call(&hv_ghcb->ghcb, SVM_EXIT_MSR, 1, 0))
 		pr_warn("Fail to write msr via ghcb %llx.\n", msr);
 
 	local_irq_restore(flags);
@@ -133,7 +207,6 @@ void hv_ghcb_msr_read(u64 msr, u64 *value)
 	union hv_ghcb *hv_ghcb;
 	void **ghcb_base;
 	unsigned long flags;
-	struct es_em_ctxt ctxt;
 
 	/* Check size of union hv_ghcb here. */
 	BUILD_BUG_ON(sizeof(union hv_ghcb) != HV_HYP_PAGE_SIZE);
@@ -152,8 +225,7 @@ void hv_ghcb_msr_read(u64 msr, u64 *value)
 	}
 
 	ghcb_set_rcx(&hv_ghcb->ghcb, msr);
-	if (sev_es_ghcb_hv_call(&hv_ghcb->ghcb, false, &ctxt,
-				SVM_EXIT_MSR, 0, 0))
+	if (hv_ghcb_hv_call(&hv_ghcb->ghcb, SVM_EXIT_MSR, 0, 0))
 		pr_warn("Fail to read msr via ghcb %llx.\n", msr);
 	else
 		*value = (u64)lower_32_bits(hv_ghcb->ghcb.save.rax)

arch/x86/include/asm/mshyperv.h

@@ -179,9 +179,13 @@ int hv_set_mem_host_visibility(unsigned long addr, int numpages, bool visible);
 #ifdef CONFIG_AMD_MEM_ENCRYPT
 void hv_ghcb_msr_write(u64 msr, u64 value);
 void hv_ghcb_msr_read(u64 msr, u64 *value);
+bool hv_ghcb_negotiate_protocol(void);
+void hv_ghcb_terminate(unsigned int set, unsigned int reason);
 #else
 static inline void hv_ghcb_msr_write(u64 msr, u64 value) {}
 static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {}
+static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
+static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
 #endif
 
 extern bool hv_isolation_type_snp(void);

drivers/clocksource/hyperv_timer.c

@@ -565,4 +565,3 @@ void __init hv_init_clocksource(void)
 	hv_sched_clock_offset = hv_read_reference_counter();
 	hv_setup_sched_clock(read_hv_sched_clock_msr);
 }
-EXPORT_SYMBOL_GPL(hv_init_clocksource);

drivers/hid/hid-hyperv.c

@@ -199,7 +199,8 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 	if (!input_device->hid_desc)
 		goto cleanup;
 
-	input_device->report_desc_size = desc->desc[0].wDescriptorLength;
+	input_device->report_desc_size = le16_to_cpu(
+					desc->desc[0].wDescriptorLength);
 	if (input_device->report_desc_size == 0) {
 		input_device->dev_info_status = -EINVAL;
 		goto cleanup;
@@ -217,7 +218,7 @@ static void mousevsc_on_receive_device_info(struct mousevsc_dev *input_device,
 
 	memcpy(input_device->report_desc,
 	       ((unsigned char *)desc) + desc->bLength,
-	       desc->desc[0].wDescriptorLength);
+	       le16_to_cpu(desc->desc[0].wDescriptorLength));
 
 	/* Send the ack */
 	memset(&ack, 0, sizeof(struct mousevsc_prt_msg));

drivers/hv/channel_mgmt.c

@@ -21,6 +21,7 @@
 #include <linux/cpu.h>
 #include <linux/hyperv.h>
 #include <asm/mshyperv.h>
+#include <linux/sched/isolation.h>
 
 #include "hyperv_vmbus.h"
 
@@ -638,6 +639,7 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
 		 */
 		if (newchannel->offermsg.offer.sub_channel_index == 0) {
 			mutex_unlock(&vmbus_connection.channel_mutex);
+			cpus_read_unlock();
 			/*
 			 * Don't call free_channel(), because newchannel->kobj
 			 * is not initialized yet.
@@ -728,16 +730,20 @@ static void init_vp_index(struct vmbus_channel *channel)
 	u32 i, ncpu = num_online_cpus();
 	cpumask_var_t available_mask;
 	struct cpumask *allocated_mask;
+	const struct cpumask *hk_mask = housekeeping_cpumask(HK_TYPE_MANAGED_IRQ);
 	u32 target_cpu;
 	int numa_node;
 
 	if (!perf_chn ||
-	    !alloc_cpumask_var(&available_mask, GFP_KERNEL)) {
+	    !alloc_cpumask_var(&available_mask, GFP_KERNEL) ||
+	    cpumask_empty(hk_mask)) {
 		/*
 		 * If the channel is not a performance critical
 		 * channel, bind it to VMBUS_CONNECT_CPU.
 		 * In case alloc_cpumask_var() fails, bind it to
 		 * VMBUS_CONNECT_CPU.
+		 * If all the cpus are isolated, bind it to
+		 * VMBUS_CONNECT_CPU.
 		 */
 		channel->target_cpu = VMBUS_CONNECT_CPU;
 		if (perf_chn)
@@ -758,17 +764,19 @@ static void init_vp_index(struct vmbus_channel *channel)
 		}
 		allocated_mask = &hv_context.hv_numa_map[numa_node];
 
-		if (cpumask_equal(allocated_mask, cpumask_of_node(numa_node))) {
+retry:
+		cpumask_xor(available_mask, allocated_mask, cpumask_of_node(numa_node));
+		cpumask_and(available_mask, available_mask, hk_mask);
+
+		if (cpumask_empty(available_mask)) {
 			/*
 			 * We have cycled through all the CPUs in the node;
 			 * reset the allocated map.
 			 */
 			cpumask_clear(allocated_mask);
+			goto retry;
 		}
 
-		cpumask_xor(available_mask, allocated_mask,
-			    cpumask_of_node(numa_node));
-
 		target_cpu = cpumask_first(available_mask);
 		cpumask_set_cpu(target_cpu, allocated_mask);
 

drivers/hv/hv_kvp.c

@@ -394,7 +394,7 @@ kvp_send_key(struct work_struct *dummy)
 	in_msg = kvp_transaction.kvp_msg;
 
 	/*
-	 * The key/value strings sent from the host are encoded in
+	 * The key/value strings sent from the host are encoded
 	 * in utf16; convert it to utf8 strings.
 	 * The host assures us that the utf16 strings will not exceed
 	 * the max lengths specified. We will however, reserve room

drivers/hv/vmbus_drv.c

@@ -21,6 +21,7 @@
 #include <linux/kernel_stat.h>
 #include <linux/clockchips.h>
 #include <linux/cpu.h>
+#include <linux/sched/isolation.h>
 #include <linux/sched/task_stack.h>
 
 #include <linux/delay.h>
@@ -1770,6 +1771,9 @@ static ssize_t target_cpu_store(struct vmbus_channel *channel,
 	if (target_cpu >= nr_cpumask_bits)
 		return -EINVAL;
 
+	if (!cpumask_test_cpu(target_cpu, housekeeping_cpumask(HK_TYPE_MANAGED_IRQ)))
+		return -EINVAL;
+
 	/* No CPUs should come up or down during this. */
 	cpus_read_lock();