X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=blobdiff_plain;f=palacios%2Fsrc%2Fpalacios%2Fvmm_shadow_paging_32.h;h=c358c3c374c9202e9f2dce75946bbdb280fedf69;hp=d60eb9f5a8d59c6fc58d4edbbd541a43886477ae;hb=cfcc5717f659b3ed2954f41cf363d3bceae8dc84;hpb=c163873b7b96544683030cafba0e73a7ed988171 diff --git a/palacios/src/palacios/vmm_shadow_paging_32.h b/palacios/src/palacios/vmm_shadow_paging_32.h index d60eb9f..c358c3c 100644 --- a/palacios/src/palacios/vmm_shadow_paging_32.h +++ b/palacios/src/palacios/vmm_shadow_paging_32.h @@ -27,15 +27,22 @@ static inline int activate_shadow_pt_32(struct guest_info * info) { shdw_page->cr3 = shdw_page->page_pa; - shadow_cr3->pdt_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa); + shadow_cr3->pdt_base_addr = PAGE_BASE_ADDR_4KB(shdw_page->page_pa); PrintDebug( "Created new shadow page table %p\n", (void *)BASE_TO_PAGE_ADDR(shadow_cr3->pdt_base_addr)); shadow_cr3->pwt = guest_cr3->pwt; shadow_cr3->pcd = guest_cr3->pcd; +#ifdef CONFIG_SYMBIOTIC_SWAP + v3_swap_flush(info); +#endif + return 0; } + + + /* * * * * @@ -43,15 +50,11 @@ static inline int activate_shadow_pt_32(struct guest_info * info) { * * * * */ -static int handle_large_pagefault_32(struct guest_info * info, - addr_t fault_addr, pf_error_t error_code, - pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde); +static int handle_4MB_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code, + pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde); -static int handle_shadow_pte32_fault(struct guest_info * info, - addr_t fault_addr, - pf_error_t error_code, - pte32_t * shadow_pt, - pte32_t * guest_pt); +static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code, + pte32_t * shadow_pt, pte32_t * guest_pt); static inline int handle_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code) { @@ -64,6 +67,7 @@ static inline int handle_shadow_pagefault_32(struct guest_info * info, addr_t fa pde32_t * shadow_pde = (pde32_t *)&(shadow_pd[PDE32_INDEX(fault_addr)]); PrintDebug("Shadow page fault handler: %p\n", (void*) fault_addr ); + PrintDebug("Handling PDE32 Fault\n"); if (guest_pa_to_host_va(info, guest_cr3, (addr_t*)&guest_pd) == -1) { PrintError("Invalid Guest PDE Address: 0x%p\n", (void *)guest_cr3); @@ -81,237 +85,120 @@ static inline int handle_shadow_pagefault_32(struct guest_info * info, addr_t fa /* Was the page fault caused by the Guest's page tables? */ if (is_guest_pf(guest_pde_access, shadow_pde_access) == 1) { - PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (pf error code=%d)\n", - *(uint_t *)&guest_pde_access, *(uint_t *)&error_code); - inject_guest_pf(info, fault_addr, error_code); + PrintDebug("Injecting PDE pf to guest: (guest access error=%d) (shdw access error=%d) (pf error code=%d)\n", + *(uint_t *)&guest_pde_access, *(uint_t *)&shadow_pde_access, *(uint_t *)&error_code); + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -1; + } return 0; } - - if (shadow_pde_access == PT_ACCESS_NOT_PRESENT) - { - struct shadow_page_data * shdw_page = create_new_shadow_pt(info); - pte32_t * shadow_pt = (pte32_t *)V3_VAddr((void *)shdw_page->page_pa); - - shadow_pde->present = 1; - shadow_pde->user_page = guest_pde->user_page; - // shadow_pde->large_page = guest_pde->large_page; - shadow_pde->large_page = 0; - - - // VMM Specific options - shadow_pde->write_through = guest_pde->write_through; - shadow_pde->cache_disable = guest_pde->cache_disable; - shadow_pde->global_page = guest_pde->global_page; - // - - guest_pde->accessed = 1; - - shadow_pde->pt_base_addr = PAGE_BASE_ADDR((addr_t)V3_PAddr(shadow_pt)); - - if (guest_pde->large_page == 0) { - pte32_t * guest_pt = NULL; - shadow_pde->writable = guest_pde->writable; - - if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) { - // Machine check the guest - PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr)); - v3_raise_exception(info, MC_EXCEPTION); - return 0; - } - - if (handle_shadow_pte32_fault(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) { - PrintError("Error handling Page fault caused by PTE\n"); - return -1; - } - } else { - // ?? What if guest pde is dirty a this point? - ((pde32_4MB_t *)guest_pde)->dirty = 0; - shadow_pde->writable = 0; - - if (handle_large_pagefault_32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) { - PrintError("Error handling large pagefault\n"); - return -1; - } - } - } - else if (shadow_pde_access == PT_ACCESS_OK) - { - // - // PTE fault - // - pte32_t * shadow_pt = (pte32_t *)V3_VAddr( (void*)(addr_t) BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr) ); - if (guest_pde->large_page == 0) { - pte32_t * guest_pt = NULL; - - if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) { - // Machine check the guest - PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr)); - v3_raise_exception(info, MC_EXCEPTION); - return 0; - } + if (shadow_pde_access == PT_ACCESS_USER_ERROR) { + // + // PDE Entry marked non user + // + PrintDebug("Shadow Paging User access error (shadow_pde_access=0x%x, guest_pde_access=0x%x)\n", + shadow_pde_access, guest_pde_access); - if (handle_shadow_pte32_fault(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) { - PrintError("Error handling Page fault caused by PTE\n"); - return -1; - } - } else if (guest_pde->large_page == 1) { - if (handle_large_pagefault_32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) { - PrintError("Error handling large pagefault\n"); - return -1; - } - } - } - else if ((shadow_pde_access == PT_ACCESS_WRITE_ERROR) && - (guest_pde->large_page == 1)) - { - // - // Page Directory Entry marked read-only - // Its a large page and we need to update the dirty bit in the guest - // - - PrintDebug("Large page write error... Setting dirty bit and returning\n"); - ((pde32_4MB_t *)guest_pde)->dirty = 1; - shadow_pde->writable = guest_pde->writable; - return 0; - - } - else if (shadow_pde_access == PT_ACCESS_USER_ERROR) - { - // - // Page Directory Entry marked non-user - // - PrintDebug("Shadow Paging User access error (shadow_pde_access=0x%x, guest_pde_access=0x%x)\n", - shadow_pde_access, guest_pde_access); - inject_guest_pf(info, fault_addr, error_code); - return 0; + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -1; } - else - { - // inject page fault in guest - inject_guest_pf(info, fault_addr, error_code); - PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access); - PrintDebug("Manual Says to inject page fault into guest\n"); -#ifdef DEBUG_SHADOW_PAGING - PrintDebug("Guest PDE: (access=%d)\n\t", guest_pde_access); - PrintPTEntry(info, PAGE_PD32, fault_addr, guest_pde); - PrintDebug("Shadow PDE: (access=%d)\n\t", shadow_pde_access); - PrintPTEntry(info, PAGE_PD32, fault_addr, shadow_pde); -#endif - - return 0; + return 0; + } else if ((shadow_pde_access == PT_ACCESS_WRITE_ERROR) && + (guest_pde->large_page == 1)) { + + ((pde32_4MB_t *)guest_pde)->dirty = 1; + shadow_pde->writable = guest_pde->writable; + return 0; + } else if ((shadow_pde_access != PT_ACCESS_NOT_PRESENT) && + (shadow_pde_access != PT_ACCESS_OK)) { + // inject page fault in guest + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -1; } - - PrintDebug("Returning end of PDE function (rip=%p)\n", (void *)(addr_t)(info->rip)); - return 0; -} - - - -/* The guest status checks have already been done, - * only special case shadow checks remain - */ -static int handle_large_pagefault_32(struct guest_info * info, - addr_t fault_addr, pf_error_t error_code, - pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde) -{ - pt_access_status_t shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code); - pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]); - addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_4MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_4MB(fault_addr); - - struct v3_shadow_region * shdw_reg = v3_get_shadow_region(info, guest_fault_pa); - - - if (shdw_reg == NULL) { - // Inject a machine check in the guest - PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa); - v3_raise_exception(info, MC_EXCEPTION); - return -1; - } - - if (shadow_pte_access == PT_ACCESS_OK) { - // Inconsistent state... - // Guest Re-Entry will flush tables and everything should now workd - PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n"); + PrintDebug("Unknown Error occurred (shadow_pde_access=%d)\n", shadow_pde_access); + PrintDebug("Manual Says to inject page fault into guest\n"); return 0; } - if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) { - // Get the guest physical address of the fault - - if ((shdw_reg->host_type == SHDW_REGION_ALLOCATED) || - (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK)) { - addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_fault_pa); + pte32_t * shadow_pt = NULL; + pte32_t * guest_pt = NULL; - shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa); + // Get the next shadow page level, allocate if not present - shadow_pte->present = 1; + if (shadow_pde_access == PT_ACCESS_NOT_PRESENT) { + struct shadow_page_data * shdw_page = create_new_shadow_pt(info); + shadow_pt = (pte32_t *)V3_VAddr((void *)shdw_page->page_pa); - /* We are assuming that the PDE entry has precedence - * so the Shadow PDE will mirror the guest PDE settings, - * and we don't have to worry about them here - * Allow everything - */ - shadow_pte->user_page = 1; + shadow_pde->present = 1; + shadow_pde->user_page = guest_pde->user_page; - if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) { - shadow_pte->writable = 0; - } else { - shadow_pte->writable = 1; - } - //set according to VMM policy - shadow_pte->write_through = large_guest_pde->write_through; - shadow_pte->cache_disable = large_guest_pde->cache_disable; - shadow_pte->global_page = large_guest_pde->global_page; - // - + if (guest_pde->large_page == 0) { + shadow_pde->writable = guest_pde->writable; } else { - // Handle hooked pages as well as other special pages - // if (handle_special_page_fault(info, fault_addr, guest_fault_pa, error_code) == -1) { + // This large page flag is temporary until we can get a working cache.... + ((pde32_4MB_t *)guest_pde)->vmm_info = V3_LARGE_PG; - if (v3_handle_mem_full_hook(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) { - PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr); - return -1; + if (error_code.write) { + shadow_pde->writable = guest_pde->writable; + ((pde32_4MB_t *)guest_pde)->dirty = 1; + } else { + shadow_pde->writable = 0; + ((pde32_4MB_t *)guest_pde)->dirty = 0; } } - } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) { + + + // VMM Specific options + shadow_pde->write_through = guest_pde->write_through; + shadow_pde->cache_disable = guest_pde->cache_disable; + shadow_pde->global_page = guest_pde->global_page; + // + + guest_pde->accessed = 1; + - if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) { - if (v3_handle_mem_wr_hook(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) { - PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr); - return -1; - } - } + shadow_pde->pt_base_addr = PAGE_BASE_ADDR(shdw_page->page_pa); + } else { + shadow_pt = (pte32_t *)V3_VAddr((void *)BASE_TO_PAGE_ADDR(shadow_pde->pt_base_addr)); + } + + if (guest_pde->large_page == 0) { + if (guest_pa_to_host_va(info, BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr), (addr_t*)&guest_pt) == -1) { + // Machine check the guest + PrintDebug("Invalid Guest PTE Address: 0x%p\n", (void *)BASE_TO_PAGE_ADDR(guest_pde->pt_base_addr)); + v3_raise_exception(info, MC_EXCEPTION); + return 0; + } + if (handle_pte_shadow_pagefault_32(info, fault_addr, error_code, shadow_pt, guest_pt) == -1) { + PrintError("Error handling Page fault caused by PTE\n"); + return -1; + } } else { - PrintError("Error in large page fault handler...\n"); - PrintError("This case should have been handled at the top level handler\n"); - return -1; + if (handle_4MB_shadow_pagefault_32(info, fault_addr, error_code, shadow_pt, (pde32_4MB_t *)guest_pde) == -1) { + PrintError("Error handling large pagefault\n"); + return -1; + } } - PrintDebug("Returning from large page fault handler\n"); return 0; } - - -/* - * We assume the the guest pte pointer has already been translated to a host virtual address - */ -static int handle_shadow_pte32_fault(struct guest_info * info, - addr_t fault_addr, - pf_error_t error_code, - pte32_t * shadow_pt, - pte32_t * guest_pt) { +static int handle_pte_shadow_pagefault_32(struct guest_info * info, addr_t fault_addr, pf_error_t error_code, + pte32_t * shadow_pt, pte32_t * guest_pt) { pt_access_status_t guest_pte_access; pt_access_status_t shadow_pte_access; @@ -334,18 +221,79 @@ static int handle_shadow_pte32_fault(struct guest_info * info, // Check the shadow page permissions shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code); -#ifdef DEBUG_SHADOW_PAGING - PrintDebug("Guest PTE: (access=%d)\n\t", guest_pte_access); - PrintPTEntry(info, PAGE_PT32, fault_addr, guest_pte); - PrintDebug("Shadow PTE: (access=%d)\n\t", shadow_pte_access); - PrintPTEntry(info, PAGE_PT32, fault_addr, shadow_pte); -#endif /* Was the page fault caused by the Guest's page tables? */ if (is_guest_pf(guest_pte_access, shadow_pte_access) == 1) { + PrintDebug("Access error injecting pf to guest (guest access error=%d) (pf error code=%d)\n", - guest_pte_access, *(uint_t*)&error_code); - inject_guest_pf(info, fault_addr, error_code); + guest_pte_access, *(uint_t*)&error_code); + +#ifdef CONFIG_SYMBIOTIC_SWAP + if (is_swapped_pte32(guest_pte)) { + pf_error_t swap_perms; + +#ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY + if (error_code.write == 0) { + info->swap_state.read_faults++; + } else { + info->swap_state.write_faults++; + } +#endif + + if (v3_get_vaddr_perms(info, fault_addr, guest_pte, &swap_perms) == -1) { + PrintError("Error getting Swapped page permissions\n"); + return -1; + } + + + // swap_perms.write == 1 || error_code.write == 0 + // swap_perms.user == 0 || error_code.user == 1 + + // This checks for permissions violations that require a guest PF injection + if ( (swap_perms.present == 1) && + ( (swap_perms.write == 1) || + (error_code.write == 0) ) && + ( (swap_perms.user == 1) || + (error_code.user == 0) ) ) { + addr_t swp_pg_addr = 0; + + PrintDebug("Page fault on swapped out page (vaddr=%p) (pte=%x) (error_code=%x)\n", + (void *)fault_addr, *(uint32_t *)guest_pte, *(uint32_t *)&error_code); + + swp_pg_addr = v3_get_swapped_pg_addr(info, shadow_pte, guest_pte); + + PrintDebug("Swapped page address=%p\n", (void *)swp_pg_addr); + + if (swp_pg_addr != 0) { + shadow_pte->writable = swap_perms.write; + shadow_pte->user_page = swap_perms.user; + + shadow_pte->write_through = 0; + shadow_pte->cache_disable = 0; + shadow_pte->global_page = 0; + + shadow_pte->present = 1; + + shadow_pte->page_base_addr = swp_pg_addr; + +#ifdef CONFIG_SYMBIOTIC_SWAP_TELEMETRY + info->swap_state.mapped_pages++; +#endif + + return 0; + } + } else { + PrintDebug("Not a sym swappable page\n"); + } + } +#endif + + + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -1; + } + return 0; } @@ -368,6 +316,8 @@ static int handle_shadow_pte32_fault(struct guest_info * info, addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_pa); shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa); + + PrintDebug("\tMapping shadow page (%p)\n", (void *)BASE_TO_PAGE_ADDR(shadow_pte->page_base_addr)); shadow_pte->present = guest_pte->present; shadow_pte->user_page = guest_pte->user_page; @@ -422,18 +372,120 @@ static int handle_shadow_pte32_fault(struct guest_info * info, } else { // Inject page fault into the guest - inject_guest_pf(info, fault_addr, error_code); + if (inject_guest_pf(info, fault_addr, error_code) == -1) { + PrintError("Could not inject guest page fault for vaddr %p\n", (void *)fault_addr); + return -1; + } + PrintError("PTE Page fault fell through... Not sure if this should ever happen\n"); PrintError("Manual Says to inject page fault into guest\n"); return -1; } - PrintDebug("Returning end of function\n"); return 0; } +static int handle_4MB_shadow_pagefault_32(struct guest_info * info, + addr_t fault_addr, pf_error_t error_code, + pte32_t * shadow_pt, pde32_4MB_t * large_guest_pde) +{ + pt_access_status_t shadow_pte_access = v3_can_access_pte32(shadow_pt, fault_addr, error_code); + pte32_t * shadow_pte = (pte32_t *)&(shadow_pt[PTE32_INDEX(fault_addr)]); + addr_t guest_fault_pa = BASE_TO_PAGE_ADDR_4MB(large_guest_pde->page_base_addr) + PAGE_OFFSET_4MB(fault_addr); + + + PrintDebug("Handling 4MB fault (guest_fault_pa=%p) (error_code=%x)\n", (void *)guest_fault_pa, *(uint_t*)&error_code); + PrintDebug("ShadowPT=%p, LargeGuestPDE=%p\n", shadow_pt, large_guest_pde); + + struct v3_shadow_region * shdw_reg = v3_get_shadow_region(info, guest_fault_pa); + + + if (shdw_reg == NULL) { + // Inject a machine check in the guest + PrintDebug("Invalid Guest Address in page table (0x%p)\n", (void *)guest_fault_pa); + v3_raise_exception(info, MC_EXCEPTION); + return -1; + } + + if (shadow_pte_access == PT_ACCESS_OK) { + // Inconsistent state... + // Guest Re-Entry will flush tables and everything should now workd + PrintDebug("Inconsistent state... Guest re-entry should flush tlb\n"); + return 0; + } + + + if (shadow_pte_access == PT_ACCESS_NOT_PRESENT) { + // Get the guest physical address of the fault + + if ((shdw_reg->host_type == SHDW_REGION_ALLOCATED) || + (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK)) { + addr_t shadow_pa = v3_get_shadow_addr(shdw_reg, guest_fault_pa); + + shadow_pte->page_base_addr = PAGE_BASE_ADDR(shadow_pa); + + PrintDebug("\tMapping shadow page (%p)\n", (void *)BASE_TO_PAGE_ADDR(shadow_pte->page_base_addr)); + + shadow_pte->present = 1; + + /* We are assuming that the PDE entry has precedence + * so the Shadow PDE will mirror the guest PDE settings, + * and we don't have to worry about them here + * Allow everything + */ + shadow_pte->user_page = 1; + + if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) { + shadow_pte->writable = 0; + } else { + shadow_pte->writable = 1; + } + + //set according to VMM policy + shadow_pte->write_through = large_guest_pde->write_through; + shadow_pte->cache_disable = large_guest_pde->cache_disable; + shadow_pte->global_page = large_guest_pde->global_page; + // + + } else { + if (v3_handle_mem_full_hook(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) { + PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr); + return -1; + } + } + } else if (shadow_pte_access == PT_ACCESS_WRITE_ERROR) { + + if (shdw_reg->host_type == SHDW_REGION_WRITE_HOOK) { + + if (v3_handle_mem_wr_hook(info, fault_addr, guest_fault_pa, shdw_reg, error_code) == -1) { + PrintError("Special Page Fault handler returned error for address: %p\n", (void *)fault_addr); + return -1; + } + } + + } else { + PrintError("Error in large page fault handler...\n"); + PrintError("This case should have been handled at the top level handler\n"); + return -1; + } + + PrintDebug("Returning from large page fault handler\n"); + return 0; +} + + + + + + + + + + + + /* If we start to optimize we should look up the guest pages in the cache... */ static inline int handle_shadow_invlpg_32(struct guest_info * info, addr_t vaddr) { pde32_t * shadow_pd = (pde32_t *)CR3_TO_PDE32_VA(info->ctrl_regs.cr3);