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KVM: x86: declare Xen HVM shared info capability and add test case

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Instead of adding a plethora of new KVM_CAP_XEN_FOO capabilities, just
add bits to the return value of KVM_CAP_XEN_HVM.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
David Woodhouse 2020-12-04 01:02:04 +00:00
parent 40da8ccd72
commit 8d4e7e8083
4 changed files with 175 additions and 1 deletions
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3
arch/x86/kvm/x86.c
View File

@ -3769,7 +3769,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
break;
case KVM_CAP_XEN_HVM:
r = KVM_XEN_HVM_CONFIG_HYPERCALL_MSR |
KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL;
KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL |
KVM_XEN_HVM_CONFIG_SHARED_INFO;
break;
case KVM_CAP_SYNC_REGS:
r = KVM_SYNC_X86_VALID_FIELDS;

3
include/uapi/linux/kvm.h
View File

@ -1152,6 +1152,7 @@ struct kvm_x86_mce {
#ifdef KVM_CAP_XEN_HVM
#define KVM_XEN_HVM_CONFIG_HYPERCALL_MSR (1 << 0)
#define KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL (1 << 1)
#define KVM_XEN_HVM_CONFIG_SHARED_INFO (1 << 2)
struct kvm_xen_hvm_config {
__u32 flags;
@ -1604,6 +1605,7 @@ struct kvm_xen_hvm_attr {
} u;
};
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO */
#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0
#define KVM_XEN_ATTR_TYPE_SHARED_INFO 0x1
#define KVM_XEN_ATTR_TYPE_UPCALL_VECTOR 0x2
@ -1621,6 +1623,7 @@ struct kvm_xen_vcpu_attr {
} u;
};
/* Available with KVM_CAP_XEN_HVM / KVM_XEN_HVM_CONFIG_SHARED_INFO */
#define KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO 0x0
#define KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO 0x1

1
tools/testing/selftests/kvm/Makefile
View File

@ -62,6 +62,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
TEST_GEN_PROGS_x86_64 += x86_64/debug_regs
TEST_GEN_PROGS_x86_64 += x86_64/tsc_msrs_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_pmu_msrs_test
TEST_GEN_PROGS_x86_64 += x86_64/xen_shinfo_test
TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test

169
tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c Normal file
View File

@ -0,0 +1,169 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* svm_vmcall_test
*
* Copyright © 2021 Amazon.com, Inc. or its affiliates.
*
* Xen shared_info / pvclock testing
*/
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include <stdint.h>
#include <time.h>
#define VCPU_ID 5
#define SHINFO_REGION_GPA 0xc0000000ULL
#define SHINFO_REGION_SLOT 10
#define PAGE_SIZE 4096
#define PVTIME_ADDR (SHINFO_REGION_GPA + PAGE_SIZE)
static struct kvm_vm *vm;
#define XEN_HYPERCALL_MSR 0x40000000
struct pvclock_vcpu_time_info {
u32 version;
u32 pad0;
u64 tsc_timestamp;
u64 system_time;
u32 tsc_to_system_mul;
s8 tsc_shift;
u8 flags;
u8 pad[2];
} __attribute__((__packed__)); /* 32 bytes */
struct pvclock_wall_clock {
u32 version;
u32 sec;
u32 nsec;
} __attribute__((__packed__));
static void guest_code(void)
{
GUEST_DONE();
}
static int cmp_timespec(struct timespec *a, struct timespec *b)
{
if (a->tv_sec > b->tv_sec)
return 1;
else if (a->tv_sec < b->tv_sec)
return -1;
else if (a->tv_nsec > b->tv_nsec)
return 1;
else if (a->tv_nsec < b->tv_nsec)
return -1;
else
return 0;
}
int main(int argc, char *argv[])
{
struct timespec min_ts, max_ts, vm_ts;
if (!(kvm_check_cap(KVM_CAP_XEN_HVM) &
KVM_XEN_HVM_CONFIG_SHARED_INFO) ) {
print_skip("KVM_XEN_HVM_CONFIG_SHARED_INFO not available");
exit(KSFT_SKIP);
}
clock_gettime(CLOCK_REALTIME, &min_ts);
vm = vm_create_default(VCPU_ID, 0, (void *) guest_code);
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
/* Map a region for the shared_info page */
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
SHINFO_REGION_GPA, SHINFO_REGION_SLOT,
2 * getpagesize(), 0);
virt_map(vm, SHINFO_REGION_GPA, SHINFO_REGION_GPA, 2, 0);
struct kvm_xen_hvm_config hvmc = {
.flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL,
.msr = XEN_HYPERCALL_MSR,
};
vm_ioctl(vm, KVM_XEN_HVM_CONFIG, &hvmc);
struct kvm_xen_hvm_attr lm = {
.type = KVM_XEN_ATTR_TYPE_LONG_MODE,
.u.long_mode = 1,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &lm);
struct kvm_xen_hvm_attr ha = {
.type = KVM_XEN_ATTR_TYPE_SHARED_INFO,
.u.shared_info.gfn = SHINFO_REGION_GPA / PAGE_SIZE,
};
vm_ioctl(vm, KVM_XEN_HVM_SET_ATTR, &ha);
struct kvm_xen_vcpu_attr vi = {
.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_INFO,
.u.gpa = SHINFO_REGION_GPA + 40,
};
vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &vi);
struct kvm_xen_vcpu_attr pvclock = {
.type = KVM_XEN_VCPU_ATTR_TYPE_VCPU_TIME_INFO,
.u.gpa = PVTIME_ADDR,
};
vcpu_ioctl(vm, VCPU_ID, KVM_XEN_VCPU_SET_ATTR, &pvclock);
for (;;) {
volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
struct ucall uc;
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vm, VCPU_ID, &uc)) {
case UCALL_ABORT:
TEST_FAIL("%s", (const char *)uc.args[0]);
/* NOT REACHED */
case UCALL_SYNC:
break;
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall 0x%lx.", uc.cmd);
}
}
done:
clock_gettime(CLOCK_REALTIME, &max_ts);
/*
* Just a *really* basic check that things are being put in the
* right place. The actual calculations are much the same for
* Xen as they are for the KVM variants, so no need to check.
*/
struct pvclock_wall_clock *wc;
struct pvclock_vcpu_time_info *ti, *ti2;
wc = addr_gva2hva(vm, SHINFO_REGION_GPA + 0xc00);
ti = addr_gva2hva(vm, SHINFO_REGION_GPA + 0x40 + 0x20);
ti2 = addr_gva2hva(vm, PVTIME_ADDR);
vm_ts.tv_sec = wc->sec;
vm_ts.tv_nsec = wc->nsec;
TEST_ASSERT(wc->version && !(wc->version & 1),
"Bad wallclock version %x", wc->version);
TEST_ASSERT(cmp_timespec(&min_ts, &vm_ts) <= 0, "VM time too old");
TEST_ASSERT(cmp_timespec(&max_ts, &vm_ts) >= 0, "VM time too new");
TEST_ASSERT(ti->version && !(ti->version & 1),
"Bad time_info version %x", ti->version);
TEST_ASSERT(ti2->version && !(ti2->version & 1),
"Bad time_info version %x", ti->version);
kvm_vm_free(vm);
return 0;
}