From: Wei Liu <wei.liu@kernel.org>
To: Linux on Hyper-V List <linux-hyperv@vger.kernel.org>
Cc: virtualization@lists.linux-foundation.org,
Linux Kernel List <linux-kernel@vger.kernel.org>,
Michael Kelley <mikelley@microsoft.com>,
Vineeth Pillai <viremana@linux.microsoft.com>,
Sunil Muthuswamy <sunilmut@microsoft.com>,
Nuno Das Neves <nunodasneves@linux.microsoft.com>,
pasha.tatashin@soleen.com, Wei Liu <wei.liu@kernel.org>,
Lillian Grassin-Drake <ligrassi@microsoft.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
"H. Peter Anvin" <hpa@zytor.com>, Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org (open list:GENERIC INCLUDE/ASM HEADER
FILES)
Subject: [PATCH v6 06/16] x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary
Date: Wed, 3 Feb 2021 15:04:25 +0000 [thread overview]
Message-ID: <20210203150435.27941-7-wei.liu@kernel.org> (raw)
In-Reply-To: <20210203150435.27941-1-wei.liu@kernel.org>
We will need the partition ID for executing some hypercalls later.
Signed-off-by: Lillian Grassin-Drake <ligrassi@microsoft.com>
Co-Developed-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---
v6:
1. Use u64 status.
v3:
1. Make hv_get_partition_id static.
2. Change code structure a bit.
---
arch/x86/hyperv/hv_init.c | 26 ++++++++++++++++++++++++++
arch/x86/include/asm/mshyperv.h | 2 ++
include/asm-generic/hyperv-tlfs.h | 6 ++++++
3 files changed, 34 insertions(+)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 6f4cb40e53fe..5b90a7290177 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -26,6 +26,9 @@
#include <linux/syscore_ops.h>
#include <clocksource/hyperv_timer.h>
+u64 hv_current_partition_id = ~0ull;
+EXPORT_SYMBOL_GPL(hv_current_partition_id);
+
void *hv_hypercall_pg;
EXPORT_SYMBOL_GPL(hv_hypercall_pg);
@@ -331,6 +334,24 @@ static struct syscore_ops hv_syscore_ops = {
.resume = hv_resume,
};
+static void __init hv_get_partition_id(void)
+{
+ struct hv_get_partition_id *output_page;
+ u64 status;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ output_page = *this_cpu_ptr(hyperv_pcpu_output_arg);
+ status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output_page);
+ if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) {
+ /* No point in proceeding if this failed */
+ pr_err("Failed to get partition ID: %lld\n", status);
+ BUG();
+ }
+ hv_current_partition_id = output_page->partition_id;
+ local_irq_restore(flags);
+}
+
/*
* This function is to be invoked early in the boot sequence after the
* hypervisor has been detected.
@@ -426,6 +447,11 @@ void __init hyperv_init(void)
register_syscore_ops(&hv_syscore_ops);
+ if (cpuid_ebx(HYPERV_CPUID_FEATURES) & HV_ACCESS_PARTITION_ID)
+ hv_get_partition_id();
+
+ BUG_ON(hv_root_partition && hv_current_partition_id == ~0ull);
+
return;
remove_cpuhp_state:
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 62d9390f1ddf..67f5d35a73d3 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -78,6 +78,8 @@ extern void *hv_hypercall_pg;
extern void __percpu **hyperv_pcpu_input_arg;
extern void __percpu **hyperv_pcpu_output_arg;
+extern u64 hv_current_partition_id;
+
static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
{
u64 input_address = input ? virt_to_phys(input) : 0;
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index e6903589a82a..87b1a79b19eb 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -141,6 +141,7 @@ struct ms_hyperv_tsc_page {
#define HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX 0x0013
#define HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX 0x0014
#define HVCALL_SEND_IPI_EX 0x0015
+#define HVCALL_GET_PARTITION_ID 0x0046
#define HVCALL_GET_VP_REGISTERS 0x0050
#define HVCALL_SET_VP_REGISTERS 0x0051
#define HVCALL_POST_MESSAGE 0x005c
@@ -407,6 +408,11 @@ struct hv_tlb_flush_ex {
u64 gva_list[];
} __packed;
+/* HvGetPartitionId hypercall (output only) */
+struct hv_get_partition_id {
+ u64 partition_id;
+} __packed;
+
/* HvRetargetDeviceInterrupt hypercall */
union hv_msi_entry {
u64 as_uint64;
--
2.20.1
next prev parent reply other threads:[~2021-02-03 15:07 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-03 15:04 [PATCH v6 00/16] Introducing Linux root partition support for Microsoft Hypervisor Wei Liu
2021-02-03 15:04 ` [PATCH v6 01/16] asm-generic/hyperv: change HV_CPU_POWER_MANAGEMENT to HV_CPU_MANAGEMENT Wei Liu
2021-02-03 15:04 ` [PATCH v6 02/16] x86/hyperv: detect if Linux is the root partition Wei Liu
2021-02-04 16:49 ` Michael Kelley
2021-02-03 15:04 ` [PATCH v6 03/16] Drivers: hv: vmbus: skip VMBus initialization if Linux is root Wei Liu
2021-02-03 15:04 ` [PATCH v6 04/16] clocksource/hyperv: use MSR-based access if running as root Wei Liu
2021-02-03 15:04 ` [PATCH v6 05/16] x86/hyperv: allocate output arg pages if required Wei Liu
2021-02-04 16:52 ` Michael Kelley
2021-02-03 15:04 ` Wei Liu [this message]
2021-02-04 16:54 ` [PATCH v6 06/16] x86/hyperv: extract partition ID from Microsoft Hypervisor if necessary Michael Kelley
2021-02-03 15:04 ` [PATCH v6 07/16] x86/hyperv: handling hypercall page setup for root Wei Liu
2021-02-03 15:04 ` [PATCH v6 08/16] ACPI / NUMA: add a stub function for node_to_pxm() Wei Liu
2021-02-04 18:38 ` Wei Liu
2021-02-04 18:45 ` Rafael J. Wysocki
2021-02-04 18:48 ` Wei Liu
2021-02-03 15:04 ` [PATCH v6 09/16] x86/hyperv: provide a bunch of helper functions Wei Liu
2021-02-04 17:13 ` Michael Kelley
2021-02-03 15:04 ` [PATCH v6 10/16] x86/hyperv: implement and use hv_smp_prepare_cpus Wei Liu
2021-02-03 15:04 ` [PATCH v6 11/16] asm-generic/hyperv: update hv_msi_entry Wei Liu
2021-02-03 15:04 ` [PATCH v6 12/16] asm-generic/hyperv: update hv_interrupt_entry Wei Liu
2021-02-03 15:04 ` [PATCH v6 13/16] asm-generic/hyperv: introduce hv_device_id and auxiliary structures Wei Liu
2021-02-04 17:15 ` Michael Kelley
2021-02-03 15:04 ` [PATCH v6 14/16] asm-generic/hyperv: import data structures for mapping device interrupts Wei Liu
2021-02-03 15:04 ` [PATCH v6 15/16] x86/hyperv: implement an MSI domain for root partition Wei Liu
2021-02-04 17:43 ` Michael Kelley
2021-02-04 17:56 ` Wei Liu
2021-02-04 18:40 ` Michael Kelley
2021-02-04 18:43 ` Wei Liu
2021-02-03 15:04 ` [PATCH v6 16/16] iommu/hyperv: setup an IO-APIC IRQ remapping " Wei Liu
2021-02-04 13:33 ` Joerg Roedel
2021-02-04 17:53 ` Michael Kelley
2021-02-04 19:49 ` [PATCH v6 00/16] Introducing Linux root partition support for Microsoft Hypervisor Wei Liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210203150435.27941-7-wei.liu@kernel.org \
--to=wei.liu@kernel.org \
--cc=arnd@arndb.de \
--cc=bp@alien8.de \
--cc=haiyangz@microsoft.com \
--cc=hpa@zytor.com \
--cc=kys@microsoft.com \
--cc=ligrassi@microsoft.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mikelley@microsoft.com \
--cc=mingo@redhat.com \
--cc=nunodasneves@linux.microsoft.com \
--cc=pasha.tatashin@soleen.com \
--cc=sthemmin@microsoft.com \
--cc=sunilmut@microsoft.com \
--cc=tglx@linutronix.de \
--cc=viremana@linux.microsoft.com \
--cc=virtualization@lists.linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).