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| author | Luiz Capitulino <lcapitulino@redhat.com> | 2014-03-19 17:03:53 -0400 |
|---|---|---|
| committer | Andreas Färber <afaerber@suse.de> | 2014-03-31 19:06:48 +0200 |
| commit | c8c14bcb72e436fb4aff99b4b2b92e44f2e715b5 (patch) | |
| tree | 763a01f01d1c8ecf2d63bd1bbbdfe0af5e9ce3c1 /target-i386 | |
| parent | 8648fcd52a9bcc2aa415cbe87b7c636e545acb38 (diff) | |
| download | qemu-c8c14bcb72e436fb4aff99b4b2b92e44f2e715b5.tar.gz | |
target-i386: x86_cpu_get_phys_page_debug(): support 1GB page translation
Linux guests, when using more than 4GB of RAM, may end up using 1GB pages
to store (kernel) data. When this happens, we're unable to debug a running
Linux kernel with GDB:
(gdb) p node_data[0]->node_id
Cannot access memory at address 0xffff88013fffd3a0
(gdb)
GDB returns this error because x86_cpu_get_phys_page_debug() doesn't support
translating 1GB pages in IA-32e paging mode and returns an error to GDB.
This commit adds support for 1GB page translation for IA32e paging.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/helper.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/target-i386/helper.c b/target-i386/helper.c index 4f447b8cf9..372f0e3ecb 100644 --- a/target-i386/helper.c +++ b/target-i386/helper.c @@ -941,6 +941,14 @@ hwaddr x86_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) pdpe = ldq_phys(cs->as, pdpe_addr); if (!(pdpe & PG_PRESENT_MASK)) return -1; + + if (pdpe & PG_PSE_MASK) { + page_size = 1024 * 1024 * 1024; + pte = pdpe & ~( (page_size - 1) & ~0xfff); + pte &= ~(PG_NX_MASK | PG_HI_USER_MASK); + goto out; + } + } else #endif { @@ -993,6 +1001,9 @@ hwaddr x86_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) pte = pte & env->a20_mask; } +#ifdef TARGET_X86_64 +out: +#endif page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1); paddr = (pte & TARGET_PAGE_MASK) + page_offset; return paddr; |