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d="scan'208";a="64148314" From: Andrew Cooper To: Xen-devel CC: Juergen Gross , Andrew Cooper Subject: [PATCH v2 04/70] x86/pv-shim: Don't modify the hypercall table Date: Mon, 14 Feb 2022 12:50:21 +0000 Message-ID: <20220214125127.17985-5-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20220214125127.17985-1-andrew.cooper3@citrix.com> References: <20220214125127.17985-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 From: Juergen Gross When running as pv-shim the hypercall is modified today in order to replace the functions for __HYPERVISOR_event_channel_op and __HYPERVISOR_grant_table_op hypercalls. Change this to call the related functions from the normal handlers instead when running as shim. The performance implications are not really relevant, as a normal production hypervisor will not be configured to support shim mode, so the related calls will be dropped due to optimization of the compiler. Note that for the CONFIG_PV_SHIM_EXCLUSIVE case there is a dummy wrapper do_grant_table_op() needed, as in this case grant_table.c isn't being built. Signed-off-by: Juergen Gross Signed-off-by: Andrew Cooper Reviewed-by: Jan Beulich --- xen/arch/x86/include/asm/hypercall.h | 4 ++- xen/arch/x86/include/asm/pv/shim.h | 3 ++ xen/arch/x86/pv/hypercall.c | 2 +- xen/arch/x86/pv/shim.c | 54 ++++++++++++++++---------------- xen/arch/x86/x86_64/platform_hypercall.c | 2 +- xen/common/compat/multicall.c | 3 +- xen/common/event_channel.c | 9 ++++++ xen/common/grant_table.c | 9 ++++++ 8 files changed, 54 insertions(+), 32 deletions(-) diff --git a/xen/arch/x86/include/asm/hypercall.h b/xen/arch/x86/include/asm/hypercall.h index 5d394d492318..f004824f16b6 100644 --- a/xen/arch/x86/include/asm/hypercall.h +++ b/xen/arch/x86/include/asm/hypercall.h @@ -145,6 +145,7 @@ do_set_segment_base( #include #include +#include extern int compat_physdev_op( @@ -161,8 +162,9 @@ extern int compat_mmuext_op( XEN_GUEST_HANDLE_PARAM(uint) pdone, unsigned int foreigndom); +DEFINE_XEN_GUEST_HANDLE(compat_platform_op_t); extern int compat_platform_op( - XEN_GUEST_HANDLE_PARAM(void) u_xenpf_op); + XEN_GUEST_HANDLE_PARAM(compat_platform_op_t) u_xenpf_op); extern long compat_callback_op( int cmd, XEN_GUEST_HANDLE(void) arg); diff --git a/xen/arch/x86/include/asm/pv/shim.h b/xen/arch/x86/include/asm/pv/shim.h index 8a91f4f9dfbf..6415f8068e5c 100644 --- a/xen/arch/x86/include/asm/pv/shim.h +++ b/xen/arch/x86/include/asm/pv/shim.h @@ -19,6 +19,7 @@ #ifndef __X86_PV_SHIM_H__ #define __X86_PV_SHIM_H__ +#include #include #if defined(CONFIG_PV_SHIM_EXCLUSIVE) @@ -45,6 +46,8 @@ domid_t get_initial_domain_id(void); uint64_t pv_shim_mem(uint64_t avail); void pv_shim_fixup_e820(struct e820map *e820); const struct platform_bad_page *pv_shim_reserved_pages(unsigned int *size); +typeof(do_event_channel_op) pv_shim_event_channel_op; +typeof(do_grant_table_op) pv_shim_grant_table_op; #else diff --git a/xen/arch/x86/pv/hypercall.c b/xen/arch/x86/pv/hypercall.c index ecdd58deea69..50cd219c18fc 100644 --- a/xen/arch/x86/pv/hypercall.c +++ b/xen/arch/x86/pv/hypercall.c @@ -64,7 +64,7 @@ const pv_hypercall_table_t pv_hypercall_table[] = { COMPAT_CALL(xen_version), HYPERCALL(console_io), COMPAT_CALL(physdev_op_compat), -#ifdef CONFIG_GRANT_TABLE +#if defined(CONFIG_GRANT_TABLE) || defined(CONFIG_PV_SHIM) COMPAT_CALL(grant_table_op), #endif HYPERCALL(vm_assist), diff --git a/xen/arch/x86/pv/shim.c b/xen/arch/x86/pv/shim.c index d9704121a739..7e891fe2f7a4 100644 --- a/xen/arch/x86/pv/shim.c +++ b/xen/arch/x86/pv/shim.c @@ -56,11 +56,6 @@ static DEFINE_SPINLOCK(balloon_lock); static struct platform_bad_page __initdata reserved_pages[2]; -static long pv_shim_event_channel_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg); -static long pv_shim_grant_table_op(unsigned int cmd, - XEN_GUEST_HANDLE_PARAM(void) uop, - unsigned int count); - /* * By default give the shim 1MB of free memory slack. Some users may wish to * tune this constants for better memory utilization. This can be achieved @@ -203,7 +198,6 @@ void __init pv_shim_setup_dom(struct domain *d, l4_pgentry_t *l4start, start_info_t *si) { bool compat = is_pv_32bit_domain(d); - pv_hypercall_table_t *rw_pv_hypercall_table; uint64_t param = 0; long rc; @@ -249,23 +243,6 @@ void __init pv_shim_setup_dom(struct domain *d, l4_pgentry_t *l4start, consoled_set_ring_addr(page); } - /* - * Locate pv_hypercall_table[] (usually .rodata) in the directmap (which - * is writeable) and insert some shim-specific hypercall handlers. - */ - rw_pv_hypercall_table = __va(__pa(pv_hypercall_table)); - rw_pv_hypercall_table[__HYPERVISOR_event_channel_op].native = - (hypercall_fn_t *)pv_shim_event_channel_op; - rw_pv_hypercall_table[__HYPERVISOR_grant_table_op].native = - (hypercall_fn_t *)pv_shim_grant_table_op; - -#ifdef CONFIG_PV32 - rw_pv_hypercall_table[__HYPERVISOR_event_channel_op].compat = - (hypercall_fn_t *)pv_shim_event_channel_op; - rw_pv_hypercall_table[__HYPERVISOR_grant_table_op].compat = - (hypercall_fn_t *)pv_shim_grant_table_op; -#endif - guest = d; /* @@ -435,7 +412,7 @@ int pv_shim_shutdown(uint8_t reason) return 0; } -static long pv_shim_event_channel_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg) +long pv_shim_event_channel_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg) { struct domain *d = current->domain; struct evtchn_close close; @@ -683,9 +660,9 @@ void pv_shim_inject_evtchn(unsigned int port) # define compat_handle_okay guest_handle_okay #endif -static long pv_shim_grant_table_op(unsigned int cmd, - XEN_GUEST_HANDLE_PARAM(void) uop, - unsigned int count) +long pv_shim_grant_table_op(unsigned int cmd, + XEN_GUEST_HANDLE_PARAM(void) uop, + unsigned int count) { struct domain *d = current->domain; long rc = 0; @@ -845,6 +822,29 @@ static long pv_shim_grant_table_op(unsigned int cmd, return rc; } +#ifndef CONFIG_GRANT_TABLE +/* Thin wrapper(s) needed. */ +long do_grant_table_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) uop, + unsigned int count) +{ + if ( !pv_shim ) + return -ENOSYS; + + return pv_shim_grant_table_op(cmd, uop, count); +} + +#ifdef CONFIG_PV32 +int compat_grant_table_op(unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) uop, + unsigned int count) +{ + if ( !pv_shim ) + return -ENOSYS; + + return pv_shim_grant_table_op(cmd, uop, count); +} +#endif +#endif + long pv_shim_cpu_up(void *data) { struct vcpu *v = data; diff --git a/xen/arch/x86/x86_64/platform_hypercall.c b/xen/arch/x86/x86_64/platform_hypercall.c index fbba893a47cb..966fd27b5f22 100644 --- a/xen/arch/x86/x86_64/platform_hypercall.c +++ b/xen/arch/x86/x86_64/platform_hypercall.c @@ -6,8 +6,8 @@ EMIT_FILE; #include #include +#include -DEFINE_XEN_GUEST_HANDLE(compat_platform_op_t); #define xen_platform_op compat_platform_op #define xen_platform_op_t compat_platform_op_t #define do_platform_op(x) compat_platform_op(_##x) diff --git a/xen/common/compat/multicall.c b/xen/common/compat/multicall.c index a0e9918f4805..b17739d21829 100644 --- a/xen/common/compat/multicall.c +++ b/xen/common/compat/multicall.c @@ -5,7 +5,7 @@ EMIT_FILE; #include -#include +#include #include #define COMPAT @@ -19,7 +19,6 @@ static inline void xlat_multicall_entry(struct mc_state *mcs) mcs->compat_call.args[i] = mcs->call.args[i]; } -DEFINE_XEN_GUEST_HANDLE(multicall_entry_compat_t); #define multicall_entry compat_multicall_entry #define multicall_entry_t multicall_entry_compat_t #define do_multicall_call compat_multicall_call diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c index da88ad141a69..c9912122d1e5 100644 --- a/xen/common/event_channel.c +++ b/xen/common/event_channel.c @@ -31,6 +31,10 @@ #include #include +#ifdef CONFIG_PV_SHIM +#include +#endif + #define ERROR_EXIT(_errno) \ do { \ gdprintk(XENLOG_WARNING, \ @@ -1189,6 +1193,11 @@ long do_event_channel_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg) { int rc; +#ifdef CONFIG_PV_SHIM + if ( unlikely(pv_shim) ) + return pv_shim_event_channel_op(cmd, arg); +#endif + switch ( cmd ) { case EVTCHNOP_alloc_unbound: { diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c index 3d92fee59285..925ed7d6bee2 100644 --- a/xen/common/grant_table.c +++ b/xen/common/grant_table.c @@ -44,6 +44,10 @@ #include #include +#ifdef CONFIG_PV_SHIM +#include +#endif + /* Per-domain grant information. */ struct grant_table { /* @@ -3561,6 +3565,11 @@ do_grant_table_op( long rc; unsigned int opaque_in = cmd & GNTTABOP_ARG_MASK, opaque_out = 0; +#ifdef CONFIG_PV_SHIM + if ( unlikely(pv_shim) ) + return pv_shim_grant_table_op(cmd, uop, count); +#endif + if ( (int)count < 0 ) return -EINVAL;