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Handle TLB shootdown IPI during the EFI runtime calls, on SandyBridge

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and IvyBridge machines, which support PCID but do not have INVPCID
instruction.

MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2016-09-26 17:25:25 +00:00
parent 20692187ea
commit 9fc97c9010
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=306351
1 changed files with 15 additions and 1 deletions
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16
sys/amd64/amd64/efirt.c
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@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <machine/vmparam.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
@ -301,6 +302,17 @@ efi_enter(void)
PMAP_UNLOCK(curpmap);
return (error);
}
/*
* IPI TLB shootdown handler invltlb_pcid_handler() reloads
* %cr3 from the curpmap->pm_cr3, which would disable runtime
* segments mappings. Block the handler's action by setting
* curpmap to impossible value. See also comment in
* pmap.c:pmap_activate_sw().
*/
if (pmap_pcid_enabled && !invpcid_works)
PCPU_SET(curpmap, NULL);
load_cr3(VM_PAGE_TO_PHYS(efi_pml4_page) | (pmap_pcid_enabled ?
curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
/*
@ -317,7 +329,9 @@ efi_leave(void)
{
pmap_t curpmap;
curpmap = PCPU_GET(curpmap);
curpmap = &curproc->p_vmspace->vm_pmap;
if (pmap_pcid_enabled && !invpcid_works)
PCPU_SET(curpmap, curpmap);
load_cr3(curpmap->pm_cr3 | (pmap_pcid_enabled ?
curpmap->pm_pcids[PCPU_GET(cpuid)].pm_pcid : 0));
if (!pmap_pcid_enabled)