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accel/tcg: Relax va restrictions on 64-bit guests

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We cannot at present limit a 64-bit guest to a virtual address
space smaller than the host.  It will mostly work to ignore this
limitation, except if the guest uses high bits of the address
space for tags.  But it will certainly work better, as presently
we can wind up failing to allocate the guest stack.

Widen our user-only page tree to the host or abi pointer width.
Remove the workaround for this problem from target/alpha.
Always validate guest addresses vs reserved_va, as there we
control allocation ourselves.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Message-Id: <20200513175134.19619-7-alex.bennee@linaro.org>
This commit is contained in:
Richard Henderson 2020-05-13 18:51:30 +01:00 committed by Alex Bennée
parent e307c192ff
commit 7d8cbbabcb
3 changed files with 30 additions and 23 deletions
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15
accel/tcg/translate-all.c
View File

@ -173,8 +173,13 @@ struct page_collection {
#define TB_FOR_EACH_JMP(head_tb, tb, n) \
TB_FOR_EACH_TAGGED((head_tb)->jmp_list_head, tb, n, jmp_list_next)
/* In system mode we want L1_MAP to be based on ram offsets,
while in user mode we want it to be based on virtual addresses. */
/*
* In system mode we want L1_MAP to be based on ram offsets,
* while in user mode we want it to be based on virtual addresses.
*
* TODO: For user mode, see the caveat re host vs guest virtual
* address spaces near GUEST_ADDR_MAX.
*/
#if !defined(CONFIG_USER_ONLY)
#if HOST_LONG_BITS < TARGET_PHYS_ADDR_SPACE_BITS
# define L1_MAP_ADDR_SPACE_BITS HOST_LONG_BITS
@ -182,7 +187,7 @@ struct page_collection {
# define L1_MAP_ADDR_SPACE_BITS TARGET_PHYS_ADDR_SPACE_BITS
#endif
#else
# define L1_MAP_ADDR_SPACE_BITS TARGET_VIRT_ADDR_SPACE_BITS
# define L1_MAP_ADDR_SPACE_BITS MIN(HOST_LONG_BITS, TARGET_ABI_BITS)
#endif
/* Size of the L2 (and L3, etc) page tables. */
@ -2497,9 +2502,7 @@ void page_set_flags(target_ulong start, target_ulong end, int flags)
/* This function should never be called with addresses outside the
guest address space. If this assert fires, it probably indicates
a missing call to h2g_valid. */
#if TARGET_ABI_BITS > L1_MAP_ADDR_SPACE_BITS
assert(end <= ((target_ulong)1 << L1_MAP_ADDR_SPACE_BITS));
#endif
assert(end - 1 <= GUEST_ADDR_MAX);
assert(start < end);
assert_memory_lock();

23
include/exec/cpu-all.h
View File

@ -162,12 +162,27 @@ extern unsigned long guest_base;
extern bool have_guest_base;
extern unsigned long reserved_va;
#if HOST_LONG_BITS <= TARGET_VIRT_ADDR_SPACE_BITS
#define GUEST_ADDR_MAX (~0ul)
/*
* Limit the guest addresses as best we can.
*
* When not using -R reserved_va, we cannot really limit the guest
* to less address space than the host. For 32-bit guests, this
* acts as a sanity check that we're not giving the guest an address
* that it cannot even represent. For 64-bit guests... the address
* might not be what the real kernel would give, but it is at least
* representable in the guest.
*
* TODO: Improve address allocation to avoid this problem, and to
* avoid setting bits at the top of guest addresses that might need
* to be used for tags.
*/
#if MIN(TARGET_VIRT_ADDR_SPACE_BITS, TARGET_ABI_BITS) <= 32
# define GUEST_ADDR_MAX_ UINT32_MAX
#else
#define GUEST_ADDR_MAX (reserved_va ? reserved_va - 1 : \
(1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
# define GUEST_ADDR_MAX_ (~0ul)
#endif
#define GUEST_ADDR_MAX (reserved_va ? reserved_va - 1 : GUEST_ADDR_MAX_)
#else
#include "exec/hwaddr.h"

15
target/alpha/cpu-param.h
View File

@ -10,22 +10,11 @@
#define TARGET_LONG_BITS 64
#define TARGET_PAGE_BITS 13
#ifdef CONFIG_USER_ONLY
/*
* ??? The kernel likes to give addresses in high memory. If the host has
* more virtual address space than the guest, this can lead to impossible
* allocations. Honor the long-standing assumption that only kernel addrs
* are negative, but otherwise allow allocations anywhere. This could lead
* to tricky emulation problems for programs doing tagged addressing, but
* that's far fewer than encounter the impossible allocation problem.
*/
#define TARGET_PHYS_ADDR_SPACE_BITS 63
#define TARGET_VIRT_ADDR_SPACE_BITS 63
#else
/* ??? EV4 has 34 phys addr bits, EV5 has 40, EV6 has 44. */
#define TARGET_PHYS_ADDR_SPACE_BITS 44
#define TARGET_VIRT_ADDR_SPACE_BITS (30 + TARGET_PAGE_BITS)
#endif
#define NB_MMU_MODES 3
#endif