Date: Thu, 22 Aug 2013 22:26:47 +0000 (UTC) From: Peter Grehan <grehan@FreeBSD.org> To: src-committers@freebsd.org, svn-src-projects@freebsd.org Subject: svn commit: r254675 - projects/bhyve_svm/sys/amd64/vmm/amd Message-ID: <201308222226.r7MMQl1A079911@svn.freebsd.org>
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Author: grehan Date: Thu Aug 22 22:26:46 2013 New Revision: 254675 URL: http://svnweb.freebsd.org/changeset/base/254675 Log: Handle VM_PROT_NONE in nested page table code. Submitted by: Anish Gupta (akgupt3@gmail.com) Modified: projects/bhyve_svm/sys/amd64/vmm/amd/npt.c Modified: projects/bhyve_svm/sys/amd64/vmm/amd/npt.c ============================================================================== --- projects/bhyve_svm/sys/amd64/vmm/amd/npt.c Thu Aug 22 22:20:54 2013 (r254674) +++ projects/bhyve_svm/sys/amd64/vmm/amd/npt.c Thu Aug 22 22:26:46 2013 (r254675) @@ -101,13 +101,11 @@ svm_npt_create(pml4_entry_t * pml4, vm_p } /* Find out mode bits for PTE */ - mode = PG_U; + mode = PG_U | PG_V; if (prot & VM_PROT_WRITE) mode |= PG_RW; if ((prot & VM_PROT_EXECUTE) == 0) mode |= pg_nx; - if (prot != VM_PROT_NONE) - mode |= PG_V; pt = (uint64_t *)pml4; shift = PML4SHIFT; @@ -129,18 +127,13 @@ svm_npt_create(pml4_entry_t * pml4, vm_p /* Create leaf entry mapping. */ index = (gpa >> shift) & PT_INDEX_MASK; - if (pt[index] != 0) { - ERR("Mapping already exists.\n"); - return (0); - } - - pt[index] = hpa | mode; - /* If its not last level page table entry, set PS bit. */ - if (pg_size > PAGE_SIZE) { - pt[index] |= PG_PS; - } - + if (prot != VM_PROT_NONE) { + pt[index] = hpa | mode; + pt[index] |= (pg_size > PAGE_SIZE) ? PG_PS : 0; + } else + pt[index] = 0; + return (1UL << shift); } @@ -179,11 +172,6 @@ svm_npt_vmmap_set(void *arg, vm_paddr_t while (len < size) { mapped = svm_npt_create(pml4, gpa + len, hpa + len, attr, prot, pg_size); - if (mapped == 0) { - panic("Couldn't map GPA:0x%lx, size:0x%lx", gpa, - pg_size); - } - len += mapped; }
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