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Date: Thu, 11 Mar 2010 13:20:38 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Stefano Stabellini <stefano.stabellini@...citrix.com>
CC: xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH 2 of 5] early PV on HVM
On 03/10/2010 07:47 AM, Stefano Stabellini wrote:
> Hi all,
> this patch:
>
> - adds a xen_guest_init hook in setup.c right after kvm_guest_init;
>
> - initializes basic pv on hvm features in xen_guest_init;
>
Is this 64-bit specific like Sheng's version?
I also asked him to move the setup code out of enlighten.c into a new
file, though your version is a fair bit smaller.
> Signed-off-by: Stefano Stabellini<stefano.stabellini@...citrix.com>
> Signed-off-by: Sheng Yang<sheng@...ux.intel.com>
> Signed-off-by: Yaozu (Eddie) Dong<eddie.dong@...el.com>
>
> ---
>
> diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h
> index d5b7e90..bbd3f65 100644
> --- a/arch/x86/include/asm/xen/hypervisor.h
> +++ b/arch/x86/include/asm/xen/hypervisor.h
> @@ -33,6 +33,7 @@
> #ifndef _ASM_X86_XEN_HYPERVISOR_H
> #define _ASM_X86_XEN_HYPERVISOR_H
>
> +#ifdef CONFIG_XEN
> /* arch/i386/kernel/setup.c */
> extern struct shared_info *HYPERVISOR_shared_info;
> extern struct start_info *xen_start_info;
> @@ -43,10 +44,11 @@ enum xen_domain_type {
> XEN_HVM_DOMAIN, /* running in a Xen hvm domain */
> };
>
> -#ifdef CONFIG_XEN
> extern enum xen_domain_type xen_domain_type;
> +extern void xen_guest_init(void);
> #else
> #define xen_domain_type XEN_NATIVE
> +#define xen_guest_init() do { } while (0)
> #endif
>
> #define xen_domain() (xen_domain_type != XEN_NATIVE)
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index e09f0e2..cb32e37 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -49,6 +49,7 @@
> #include<asm/pci-direct.h>
> #include<linux/init_ohci1394_dma.h>
> #include<linux/kvm_para.h>
> +#include<asm/xen/hypervisor.h>
>
> #include<linux/errno.h>
> #include<linux/kernel.h>
> @@ -1007,6 +1008,7 @@ void __init setup_arch(char **cmdline_p)
> probe_nr_irqs_gsi();
>
> kvm_guest_init();
> + xen_guest_init();
>
> e820_reserve_resources();
> e820_mark_nosave_regions(max_low_pfn);
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 3439616..42135e8 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -32,6 +32,8 @@
> #include<xen/interface/version.h>
> #include<xen/interface/physdev.h>
> #include<xen/interface/vcpu.h>
> +#include<xen/interface/memory.h>
> +#include<xen/interface/hvm/hvm_op.h>
> #include<xen/features.h>
> #include<xen/page.h>
> #include<xen/hvc-console.h>
> @@ -1179,3 +1181,86 @@ asmlinkage void __init xen_start_kernel(void)
> x86_64_start_reservations((char *)__pa_symbol(&boot_params));
> #endif
> }
> +
> +static uint32_t xen_cpuid_base(void)
> +{
> + uint32_t base, eax, ebx, ecx, edx;
> + char signature[13];
> +
> + for (base = 0x40000000; base< 0x40010000; base += 0x100) {
> + cpuid(base,&eax,&ebx,&ecx,&edx);
> + *(uint32_t*)(signature + 0) = ebx;
> + *(uint32_t*)(signature + 4) = ecx;
> + *(uint32_t*)(signature + 8) = edx;
> + signature[12] = 0;
> +
> + if (!strcmp("XenVMMXenVMM", signature)&& ((eax - base)>= 2))
> + return base;
> + }
> +
> + return 0;
> +}
> +
> +static int init_hvm_pv_info(void)
> +{
> + uint32_t eax, ebx, ecx, edx, pages, msr, base;
> + u64 pfn;
> +
> + base = xen_cpuid_base();
> + if (!base)
> + return -EINVAL;
> +
> + cpuid(base + 1,&eax,&ebx,&ecx,&edx);
> +
> + printk(KERN_INFO "Xen version %d.%d.\n", eax>> 16, eax& 0xffff);
> +
> + cpuid(base + 2,&pages,&msr,&ecx,&edx);
> +
> + /* We only support 1 page of hypercall for now */
> + if (pages != 1)
> + return -ENOMEM;
>
There's no point testing this; if we don't use hypercalls beyond the
first page, it doesn't matter one way or the other.
> +
> + pfn = __pa(hypercall_page);
> + wrmsrl(msr, pfn);
>
Use wrmsr_safe, just in case.
> +
> + xen_setup_features();
> +
> + pv_info = xen_info;
> + pv_info.kernel_rpl = 0;
> +
> + xen_domain_type = XEN_HVM_DOMAIN;
> +
> + return 0;
> +}
> +
> +static void __init init_shared_info(void)
> +{
> + struct xen_add_to_physmap xatp;
> + struct shared_info *shared_info_page;
> +
> + shared_info_page = (struct shared_info *) alloc_bootmem_pages(PAGE_SIZE);
> + xatp.domid = DOMID_SELF;
> + xatp.idx = 0;
> + xatp.space = XENMAPSPACE_shared_info;
> + xatp.gpfn = __pa(shared_info_page)>> PAGE_SHIFT;
> + if (HYPERVISOR_memory_op(XENMEM_add_to_physmap,&xatp))
> + BUG();
> +
> + HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
> +
> + /* Don't do the full vcpu_info placement stuff until we have a
> + possible map and a non-dummy shared_info. */
> + per_cpu(xen_vcpu, 0) =&HYPERVISOR_shared_info->vcpu_info[0];
> +}
> +
> +void __init xen_guest_init(void)
> +{
> + int r;
> +
> + r = init_hvm_pv_info();
> + if (r< 0)
> + return;
> +
> + init_shared_info();
> +}
> +
> diff --git a/drivers/input/xen-kbdfront.c b/drivers/input/xen-kbdfront.c
> index b115726..bfbb13b 100644
> --- a/drivers/input/xen-kbdfront.c
> +++ b/drivers/input/xen-kbdfront.c
> @@ -342,6 +342,9 @@ static int __init xenkbd_init(void)
> if (xen_initial_domain())
> return -ENODEV;
>
> + if (xen_hvm_domain())
> + return -ENODEV;
>
I think you can combine these into the same if(). Also put it in a
separate patch.
> +
> return xenbus_register_frontend(&xenkbd_driver);
> }
>
> diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
> index 54cd916..9d74c14 100644
> --- a/drivers/video/xen-fbfront.c
> +++ b/drivers/video/xen-fbfront.c
> @@ -687,6 +687,9 @@ static int __init xenfb_init(void)
> if (xen_initial_domain())
> return -ENODEV;
>
> + if (xen_hvm_domain())
> + return -ENODEV;
>
Ditto.
> +
> return xenbus_register_frontend(&xenfb_driver);
> }
>
> diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
> index d42e25d..586b8f8 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -53,6 +53,8 @@
> #include<xen/events.h>
> #include<xen/page.h>
>
> +#include<xen/hvm.h>
> +
> #include "xenbus_comms.h"
> #include "xenbus_probe.h"
>
> @@ -803,10 +805,19 @@ static int __init xenbus_probe_init(void)
> /* dom0 not yet supported */
> } else {
> xenstored_ready = 1;
> - xen_store_evtchn = xen_start_info->store_evtchn;
> - xen_store_mfn = xen_start_info->store_mfn;
> + if (xen_hvm_domain()) {
> + xen_store_evtchn =
> + hvm_get_parameter(HVM_PARAM_STORE_EVTCHN);
> + xen_store_mfn =
> + hvm_get_parameter(HVM_PARAM_STORE_PFN);
> + xen_store_interface =
> + ioremap(xen_store_mfn<< PAGE_SHIFT, PAGE_SIZE);
> + } else {
> + xen_store_evtchn = xen_start_info->store_evtchn;
> + xen_store_mfn = xen_start_info->store_mfn;
> + xen_store_interface = mfn_to_virt(xen_store_mfn);
> + }
> }
> - xen_store_interface = mfn_to_virt(xen_store_mfn);
>
> /* Initialize the interface to xenstore. */
> err = xs_init();
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xensource.com
> http://lists.xensource.com/xen-devel
>
>
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