linux-hyperv.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Michael Kelley <mikelley@microsoft.com>
To: Tianyu Lan <ltykernel@gmail.com>,
	KY Srinivasan <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>,
	Dexuan Cui <decui@microsoft.com>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	"will@kernel.org" <will@kernel.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"bp@alien8.de" <bp@alien8.de>, "x86@kernel.org" <x86@kernel.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
	"luto@kernel.org" <luto@kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
	"boris.ostrovsky@oracle.com" <boris.ostrovsky@oracle.com>,
	"jgross@suse.com" <jgross@suse.com>,
	"sstabellini@kernel.org" <sstabellini@kernel.org>,
	"joro@8bytes.org" <joro@8bytes.org>,
	"davem@davemloft.net" <davem@davemloft.net>,
	"kuba@kernel.org" <kuba@kernel.org>,
	"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
	"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"arnd@arndb.de" <arnd@arndb.de>, "hch@lst.de" <hch@lst.de>,
	"m.szyprowski@samsung.com" <m.szyprowski@samsung.com>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"brijesh.singh@amd.com" <brijesh.singh@amd.com>,
	"thomas.lendacky@amd.com" <thomas.lendacky@amd.com>,
	Tianyu Lan <Tianyu.Lan@microsoft.com>,
	"pgonda@google.com" <pgonda@google.com>,
	"martin.b.radev@gmail.com" <martin.b.radev@gmail.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"kirill.shutemov@linux.intel.com"
	<kirill.shutemov@linux.intel.com>,
	"rppt@kernel.org" <rppt@kernel.org>,
	"hannes@cmpxchg.org" <hannes@cmpxchg.org>,
	"aneesh.kumar@linux.ibm.com" <aneesh.kumar@linux.ibm.com>,
	"krish.sadhukhan@oracle.com" <krish.sadhukhan@oracle.com>,
	"saravanand@fb.com" <saravanand@fb.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	"rientjes@google.com" <rientjes@google.com>,
	"ardb@kernel.org" <ardb@kernel.org>
Cc: "iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	vkuznets <vkuznets@redhat.com>,
	"parri.andrea@gmail.com" <parri.andrea@gmail.com>,
	"dave.hansen@intel.com" <dave.hansen@intel.com>
Subject: RE: [PATCH V4 01/13] x86/hyperv: Initialize GHCB page in Isolation VM
Date: Thu, 2 Sep 2021 00:15:03 +0000	[thread overview]
Message-ID: <MWHPR21MB1593366997ACAFCC79EBC0B0D7CE9@MWHPR21MB1593.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20210827172114.414281-2-ltykernel@gmail.com>

From: Tianyu Lan <ltykernel@gmail.com> Sent: Friday, August 27, 2021 10:21 AM
> 
> Hyperv exposes GHCB page via SEV ES GHCB MSR for SNP guest
> to communicate with hypervisor. Map GHCB page for all
> cpus to read/write MSR register and submit hvcall request
> via ghcb page.
> 
> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
> ---
> Chagne since v3:
>         * Rename ghcb_base to hv_ghcb_pg and move it out of
> 	  struct ms_hyperv_info.
> 	* Allocate hv_ghcb_pg before cpuhp_setup_state() and leverage
> 	  hv_cpu_init() to initialize ghcb page.
> ---
>  arch/x86/hyperv/hv_init.c       | 68 +++++++++++++++++++++++++++++----
>  arch/x86/include/asm/mshyperv.h |  4 ++
>  arch/x86/kernel/cpu/mshyperv.c  |  3 ++
>  include/asm-generic/mshyperv.h  |  1 +
>  4 files changed, 69 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index 708a2712a516..eba10ed4f73e 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -20,6 +20,7 @@
>  #include <linux/kexec.h>
>  #include <linux/version.h>
>  #include <linux/vmalloc.h>
> +#include <linux/io.h>
>  #include <linux/mm.h>
>  #include <linux/hyperv.h>
>  #include <linux/slab.h>
> @@ -36,12 +37,42 @@ EXPORT_SYMBOL_GPL(hv_current_partition_id);
>  void *hv_hypercall_pg;
>  EXPORT_SYMBOL_GPL(hv_hypercall_pg);
> 
> +void __percpu **hv_ghcb_pg;
> +
>  /* Storage to save the hypercall page temporarily for hibernation */
>  static void *hv_hypercall_pg_saved;
> 
>  struct hv_vp_assist_page **hv_vp_assist_page;
>  EXPORT_SYMBOL_GPL(hv_vp_assist_page);
> 
> +static int hyperv_init_ghcb(void)
> +{
> +	u64 ghcb_gpa;
> +	void *ghcb_va;
> +	void **ghcb_base;
> +
> +	if (!hv_isolation_type_snp())
> +		return 0;
> +
> +	if (!hv_ghcb_pg)
> +		return -EINVAL;
> +
> +	/*
> +	 * GHCB page is allocated by paravisor. The address
> +	 * returned by MSR_AMD64_SEV_ES_GHCB is above shared
> +	 * ghcb boundary and map it here.

I'm not sure what the "shared ghcb boundary" is.  Did you
mean "shared_gpa_boundary"?

> +	 */
> +	rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
> +	ghcb_va = memremap(ghcb_gpa, HV_HYP_PAGE_SIZE, MEMREMAP_WB);
> +	if (!ghcb_va)
> +		return -ENOMEM;
> +
> +	ghcb_base = (void **)this_cpu_ptr(hv_ghcb_pg);
> +	*ghcb_base = ghcb_va;
> +
> +	return 0;
> +}
> +
>  static int hv_cpu_init(unsigned int cpu)
>  {
>  	union hv_vp_assist_msr_contents msr = { 0 };
> @@ -85,7 +116,7 @@ static int hv_cpu_init(unsigned int cpu)
>  		}
>  	}
> 
> -	return 0;
> +	return hyperv_init_ghcb();
>  }
> 
>  static void (*hv_reenlightenment_cb)(void);
> @@ -177,6 +208,14 @@ static int hv_cpu_die(unsigned int cpu)
>  {
>  	struct hv_reenlightenment_control re_ctrl;
>  	unsigned int new_cpu;
> +	void **ghcb_va;
> +
> +	if (hv_ghcb_pg) {
> +		ghcb_va = (void **)this_cpu_ptr(hv_ghcb_pg);
> +		if (*ghcb_va)
> +			memunmap(*ghcb_va);
> +		*ghcb_va = NULL;
> +	}
> 
>  	hv_common_cpu_die(cpu);
> 
> @@ -366,10 +405,16 @@ void __init hyperv_init(void)
>  		goto common_free;
>  	}
> 
> +	if (hv_isolation_type_snp()) {
> +		hv_ghcb_pg = alloc_percpu(void *);
> +		if (!hv_ghcb_pg)
> +			goto free_vp_assist_page;
> +	}
> +
>  	cpuhp = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online",
>  				  hv_cpu_init, hv_cpu_die);
>  	if (cpuhp < 0)
> -		goto free_vp_assist_page;
> +		goto free_ghcb_page;
> 
>  	/*
>  	 * Setup the hypercall page and enable hypercalls.
> @@ -383,10 +428,8 @@ void __init hyperv_init(void)
>  			VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX,
>  			VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
>  			__builtin_return_address(0));
> -	if (hv_hypercall_pg == NULL) {
> -		wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
> -		goto remove_cpuhp_state;
> -	}
> +	if (hv_hypercall_pg == NULL)
> +		goto clean_guest_os_id;
> 
>  	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
>  	hypercall_msr.enable = 1;
> @@ -456,8 +499,11 @@ void __init hyperv_init(void)
>  	hv_query_ext_cap(0);
>  	return;
> 
> -remove_cpuhp_state:
> +clean_guest_os_id:
> +	wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
>  	cpuhp_remove_state(cpuhp);
> +free_ghcb_page:
> +	free_percpu(hv_ghcb_pg);
>  free_vp_assist_page:
>  	kfree(hv_vp_assist_page);
>  	hv_vp_assist_page = NULL;
> @@ -559,3 +605,11 @@ bool hv_is_isolation_supported(void)
>  {
>  	return hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE;
>  }
> +
> +DEFINE_STATIC_KEY_FALSE(isolation_type_snp);
> +
> +bool hv_isolation_type_snp(void)
> +{
> +	return static_branch_unlikely(&isolation_type_snp);
> +}
> +EXPORT_SYMBOL_GPL(hv_isolation_type_snp);
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index adccbc209169..37739a277ac6 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -11,6 +11,8 @@
>  #include <asm/paravirt.h>
>  #include <asm/mshyperv.h>
> 
> +DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
> +
>  typedef int (*hyperv_fill_flush_list_func)(
>  		struct hv_guest_mapping_flush_list *flush,
>  		void *data);
> @@ -39,6 +41,8 @@ extern void *hv_hypercall_pg;
> 
>  extern u64 hv_current_partition_id;
> 
> +extern void __percpu **hv_ghcb_pg;
> +
>  int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
>  int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
>  int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index 6b5835a087a3..20557a9d6e25 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -316,6 +316,9 @@ static void __init ms_hyperv_init_platform(void)
> 
>  		pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n",
>  			ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b);
> +
> +		if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP)
> +			static_branch_enable(&isolation_type_snp);
>  	}
> 
>  	if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) {
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
> index c1ab6a6e72b5..0924bbd8458e 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -237,6 +237,7 @@ bool hv_is_hyperv_initialized(void);
>  bool hv_is_hibernation_supported(void);
>  enum hv_isolation_type hv_get_isolation_type(void);
>  bool hv_is_isolation_supported(void);
> +bool hv_isolation_type_snp(void);
>  void hyperv_cleanup(void);
>  bool hv_query_ext_cap(u64 cap_query);
>  #else /* CONFIG_HYPERV */
> --
> 2.25.1


  reply	other threads:[~2021-09-02  0:15 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-27 17:20 [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-08-27 17:20 ` [PATCH V4 01/13] x86/hyperv: Initialize GHCB page in Isolation VM Tianyu Lan
2021-09-02  0:15   ` Michael Kelley [this message]
2021-08-27 17:21 ` [PATCH V4 02/13] x86/hyperv: Initialize shared memory boundary in the " Tianyu Lan
2021-09-02  0:15   ` Michael Kelley
2021-09-02  6:35     ` Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 03/13] x86/hyperv: Add new hvcall guest address host visibility support Tianyu Lan
2021-09-02  0:16   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 04/13] hyperv: Mark vmbus ring buffer visible to host in Isolation VM Tianyu Lan
2021-08-27 17:41   ` Greg KH
2021-08-27 17:44     ` Tianyu Lan
2021-09-02  0:17   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 05/13] hyperv: Add Write/Read MSR registers via ghcb page Tianyu Lan
2021-08-27 17:41   ` Greg KH
2021-08-27 17:46     ` Tianyu Lan
2021-09-02  3:32   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 06/13] hyperv: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-09-02  0:20   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 07/13] hyperv/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-09-02  0:21   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 08/13] hyperv/vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-09-02  0:23   ` Michael Kelley
2021-09-02 13:35     ` Tianyu Lan
2021-09-02 16:14       ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 09/13] DMA: Add dma_map_decrypted/dma_unmap_encrypted() function Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 10/13] x86/Swiotlb: Add Swiotlb bounce buffer remap function for HV IVM Tianyu Lan
2021-08-27 17:21 ` [PATCH V4 11/13] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM Tianyu Lan
2021-09-02  1:27   ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 12/13] hv_netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-09-02  2:34   ` Michael Kelley
2021-09-02  4:56     ` Michael Kelley
2021-08-27 17:21 ` [PATCH V4 13/13] hv_storvsc: Add Isolation VM support for storvsc driver Tianyu Lan
2021-09-02  2:08   ` Michael Kelley
2021-08-30 12:00 ` [PATCH V4 00/13] x86/Hyper-V: Add Hyper-V Isolation VM support Christoph Hellwig
2021-08-31 15:20   ` Tianyu Lan
2021-09-02  7:51     ` Christoph Hellwig
2021-08-31 17:16   ` Michael Kelley
2021-09-02  7:59     ` Christoph Hellwig
2021-09-02 11:21       ` Tianyu Lan
2021-09-02 15:57       ` Michael Kelley
2021-09-14 14:41         ` Tianyu Lan

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=MWHPR21MB1593366997ACAFCC79EBC0B0D7CE9@MWHPR21MB1593.namprd21.prod.outlook.com \
    --to=mikelley@microsoft.com \
    --cc=Tianyu.Lan@microsoft.com \
    --cc=akpm@linux-foundation.org \
    --cc=aneesh.kumar@linux.ibm.com \
    --cc=ardb@kernel.org \
    --cc=arnd@arndb.de \
    --cc=boris.ostrovsky@oracle.com \
    --cc=bp@alien8.de \
    --cc=brijesh.singh@amd.com \
    --cc=catalin.marinas@arm.com \
    --cc=dave.hansen@intel.com \
    --cc=dave.hansen@linux.intel.com \
    --cc=davem@davemloft.net \
    --cc=decui@microsoft.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=haiyangz@microsoft.com \
    --cc=hannes@cmpxchg.org \
    --cc=hch@lst.de \
    --cc=hpa@zytor.com \
    --cc=iommu@lists.linux-foundation.org \
    --cc=jejb@linux.ibm.com \
    --cc=jgross@suse.com \
    --cc=joro@8bytes.org \
    --cc=kirill.shutemov@linux.intel.com \
    --cc=konrad.wilk@oracle.com \
    --cc=krish.sadhukhan@oracle.com \
    --cc=kuba@kernel.org \
    --cc=kys@microsoft.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-hyperv@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-scsi@vger.kernel.org \
    --cc=ltykernel@gmail.com \
    --cc=luto@kernel.org \
    --cc=m.szyprowski@samsung.com \
    --cc=martin.b.radev@gmail.com \
    --cc=martin.petersen@oracle.com \
    --cc=mingo@redhat.com \
    --cc=netdev@vger.kernel.org \
    --cc=parri.andrea@gmail.com \
    --cc=peterz@infradead.org \
    --cc=pgonda@google.com \
    --cc=rientjes@google.com \
    --cc=robin.murphy@arm.com \
    --cc=rppt@kernel.org \
    --cc=saravanand@fb.com \
    --cc=sstabellini@kernel.org \
    --cc=sthemmin@microsoft.com \
    --cc=tglx@linutronix.de \
    --cc=thomas.lendacky@amd.com \
    --cc=vkuznets@redhat.com \
    --cc=wei.liu@kernel.org \
    --cc=will@kernel.org \
    --cc=x86@kernel.org \
    --cc=xen-devel@lists.xenproject.org \
    --subject='RE: [PATCH V4 01/13] x86/hyperv: Initialize GHCB page in Isolation VM' \
    /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

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).