Revision 4f350c6dbcb9000e18907515ec8a7b205ac33c69 authored by Jim Mattson on 14 September 2017, 23:31:44 UTC, committed by Paolo Bonzini on 15 September 2017, 14:57:15 UTC
When emulating a nested VM-entry from L1 to L2, several control field validation checks are deferred to the hardware. Should one of these validation checks fail, vcpu_vmx_run will set the vmx->fail flag. When this happens, the L2 guest state is not loaded (even in part), and execution should continue in L1 with the next instruction after the VMLAUNCH/VMRESUME. The VMCS12 is not modified (except for the VM-instruction error field), the VMCS12 MSR save/load lists are not processed, and the CPU state is not loaded from the VMCS12 host area. Moreover, the vmcs02 exit reason is stale, so it should not be consulted for any reason. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
1 parent b060ca3
crash_dump.c
/*
* kernel/crash_dump.c - Memory preserving reboot related code.
*
* Created by: Simon Horman <horms@verge.net.au>
* Original code moved from kernel/crash.c
* Original code comment copied from the i386 version of this file
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/crash_dump.h>
#include <asm/page.h>
#include <linux/uaccess.h>
/**
* copy_oldmem_page - copy one page from "oldmem"
* @pfn: page frame number to be copied
* @buf: target memory address for the copy; this can be in kernel address
* space or user address space (see @userbuf)
* @csize: number of bytes to copy
* @offset: offset in bytes into the page (based on pfn) to begin the copy
* @userbuf: if set, @buf is in user address space, use copy_to_user(),
* otherwise @buf is in kernel address space, use memcpy().
*
* Copy a page from "oldmem". For this page, there is no pte mapped
* in the current kernel. We stitch up a pte, similar to kmap_atomic.
*
* Calling copy_to_user() in atomic context is not desirable. Hence first
* copying the data to a pre-allocated kernel page and then copying to user
* space in non-atomic context.
*/
ssize_t
copy_oldmem_page(unsigned long pfn, char *buf,
size_t csize, unsigned long offset, int userbuf)
{
void *vaddr;
if (!csize)
return 0;
vaddr = __va(pfn<<PAGE_SHIFT);
if (userbuf) {
if (copy_to_user(buf, (vaddr + offset), csize)) {
return -EFAULT;
}
} else
memcpy(buf, (vaddr + offset), csize);
return csize;
}
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