From c8c14bcb72e436fb4aff99b4b2b92e44f2e715b5 Mon Sep 17 00:00:00 2001 From: Luiz Capitulino Date: Wed, 19 Mar 2014 17:03:53 -0400 Subject: target-i386: x86_cpu_get_phys_page_debug(): support 1GB page translation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Paolo Bonzini Reviewed-by: Jan Kiszka Signed-off-by: Andreas Färber --- target-i386/helper.c | 11 +++++++++++ 1 file changed, 11 insertions(+) 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; -- cgit v1.2.1