Date: Wed, 28 Jul 2021 15:27:47 GMT From: =?utf-8?Q?Roger Pau Monn=C3=A9?= <royger@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: b6ff9345a46a - main - xen: create VM_MEMATTR_XEN for Xen memory mappings Message-ID: <202107281527.16SFRlVM087808@gitrepo.freebsd.org>
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The branch main has been updated by royger: URL: https://cgit.FreeBSD.org/src/commit/?id=b6ff9345a46af564da32ad480490eaa97840d0b6 commit b6ff9345a46af564da32ad480490eaa97840d0b6 Author: Elliott Mitchell <ehem+freebsd@m5p.com> AuthorDate: 2021-04-06 07:59:30 +0000 Commit: Roger Pau Monné <royger@FreeBSD.org> CommitDate: 2021-07-28 15:27:02 +0000 xen: create VM_MEMATTR_XEN for Xen memory mappings The requirements for pages shared with Xen/other VMs may vary from architecture to architecture. As such create a macro which various architectures can use. Remove a use of PAT_WRITE_BACK in xenstore.c. This is a x86-ism which shouldn't have been present in a common area. Original idea: Julien Grall <julien@xen.org>, 2014-01-14 06:44:08 Approach suggested by: royger Reviewed by: royger, mhorne Differential Revision: https://reviews.freebsd.org/D29351 --- sys/dev/xen/bus/xenpv.c | 2 +- sys/dev/xen/console/xen_console.c | 2 +- sys/dev/xen/xenstore/xenstore.c | 2 +- sys/x86/include/xen/xen-os.h | 3 +++ 4 files changed, 6 insertions(+), 3 deletions(-) diff --git a/sys/dev/xen/bus/xenpv.c b/sys/dev/xen/bus/xenpv.c index d9db10b7005d..080c82c73f08 100644 --- a/sys/dev/xen/bus/xenpv.c +++ b/sys/dev/xen/bus/xenpv.c @@ -125,7 +125,7 @@ xenpv_alloc_physmem(device_t dev, device_t child, int *res_id, size_t size) phys_addr = rman_get_start(res); error = vm_phys_fictitious_reg_range(phys_addr, phys_addr + size, - VM_MEMATTR_DEFAULT); + VM_MEMATTR_XEN); if (error) { bus_release_resource(child, SYS_RES_MEMORY, *res_id, res); return (NULL); diff --git a/sys/dev/xen/console/xen_console.c b/sys/dev/xen/console/xen_console.c index 7eed30885e6b..8ad755dbf214 100644 --- a/sys/dev/xen/console/xen_console.c +++ b/sys/dev/xen/console/xen_console.c @@ -273,7 +273,7 @@ static void xencons_early_init_ring(struct xencons_priv *cons) { cons->intf = pmap_mapdev_attr(ptoa(xen_get_console_mfn()), PAGE_SIZE, - VM_MEMATTR_WRITE_BACK); + VM_MEMATTR_XEN); cons->evtchn = xen_get_console_evtchn(); } diff --git a/sys/dev/xen/xenstore/xenstore.c b/sys/dev/xen/xenstore/xenstore.c index 890cfe009411..dc00ed0d50b8 100644 --- a/sys/dev/xen/xenstore/xenstore.c +++ b/sys/dev/xen/xenstore/xenstore.c @@ -1130,7 +1130,7 @@ xs_attach(device_t dev) } else { xs.gpfn = xen_get_xenstore_mfn(); xen_store = pmap_mapdev_attr(ptoa(xs.gpfn), PAGE_SIZE, - PAT_WRITE_BACK); + VM_MEMATTR_XEN); xs.initialized = true; } diff --git a/sys/x86/include/xen/xen-os.h b/sys/x86/include/xen/xen-os.h index 86bacadc8521..78d44ad7c9d7 100644 --- a/sys/x86/include/xen/xen-os.h +++ b/sys/x86/include/xen/xen-os.h @@ -30,6 +30,9 @@ #ifndef _MACHINE_X86_XEN_XEN_OS_H_ #define _MACHINE_X86_XEN_XEN_OS_H_ +/* Shared memory needs write-back as its cache attribute for coherency. */ +#define VM_MEMATTR_XEN VM_MEMATTR_WRITE_BACK + /* Everything below this point is not included by assembler (.S) files. */ #ifndef __ASSEMBLY__
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